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general description the max3286/max3296 series of products are high- speed laser drivers for fiber optic lan transmitters opti- mized for gigabit ethernet applications. each device contains a bias generator, laser modulator, and com- prehensive safety features. automatic power control (apc) adjusts the laser bias current to maintain aver- age optical power at a constant level, regardless of changes in temperature or laser properties. for lasers without a monitor photodiode, these products offer a constant-current mode. the circuit can be configured for use with conventional shortwave (780nm to 850nm) or longwave (1300nm) laser diodes, as well as vertical- cavity surface-emitting lasers (vcsels). the max3286 series (max3286?ax3289) is opti- mized for operation at 1.25gbps, and the max3296 series (max3296?ax3299) is optimized for 2.5gbps operation. each device can switch 30ma of laser mod- ulation current at the specified data rate. adjustable temperature compensation is provided to keep the opti- cal extinction ratio within specifications over the operat- ing temperature range. this series of devices is optimized to drive lasers packaged in low-cost to-46 headers. deterministic jitter (dj) for the max3286 is typically 22ps, allowing a 72% margin to gigabit ethernet dj specifications. these laser drivers provide extensive safety features to guarantee single-point fault tolerance. safety features include dual enable inputs, dual shutdown circuits, and a laser-power monitor. the safety circuit detects faults that could cause dangerous light output levels. a pro- grammable power-on reset pulse initializes the laser driver at startup. the max3286/max3296 are available in a compact, 5mm ? 5mm, 28-pin qfn or thin qfn package; a 5mm ? 5mm, 32-pin tqfp package; or in die form. the max3287/ max3288/max3289 and max3297/max3298/max3299 are available in a 16-pin tssop-ep package. applications gigabit ethernet optical transmitterfibre channel optical transmitter atm lan optical transmitter features ? 7ps deterministic jitter (max3296)22ps deterministic jitter (max3286) ? +3.0v to +5.5v supply voltage ? selectable laser pinning (common cathode orcommon anode) (max3286/max3296) ? 30ma laser modulation current ? temperature compensation of modulation current ? automatic laser power control or constant bias current ? integrated safety circuits ? power-on reset signal ? qfn and thin qfn packages available max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers ________________________________________________________________ maxim integrated products 1 19-1550; rev 6; 11/04 ordering information continued at end of data sheet. ordering information typical application circuits and selector guide appear atend of data sheet. * exposed pad is connected to gnd. pin configurations continued at end of data sheet. part temp range pin-package max3286 cti+ 0? to +70? 28 thin qfn(5mm x 5mm)**** max3286cgi 0? to +70? 28 qfn(5mm x 5mm)*** max3286chj 0? to +70? 32 tqfp(5mm x 5mm) 2827 26 25 24 23 22 tcmodset v cc out-out+ v cc v cc 89 1011 12 13 14 fltdly lv v cc in+ in- gnd ref 15 16 17 18 19 20 21 pol pol md mon gnd shdndrv biasdrv 7 6 5 4 3 2 1 pordly en en gnd por fault fault max3286max3296 thin qfn* top view + pin configurations for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. * dice are designed to operate from t j = 0? to +110?, but are tested and guaranteed only at t a = +25?. ** exposed pad. *** package code: g2855-1 **** package code: t2855-7 + denotes lead-free package. downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics(v cc = +3.0v to +5.5v, t a = 0? to +70?, unless otherwise noted. typical values are at v cc = +3.3v, r tc = open and t a = +25?; see figure 1a.) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. supply voltage at v cc ..........................................-0.5v to +7.0v voltage at en , en, pordly, fltdly, lv, in+, in-, ref, pol, pol , md, mon, biasdrv, modset, tc.......................................................-0.5v to (v cc + 0.5v) voltage at out+, out- .........................(v cc - 2v) to (v cc + 2v) current into fault, fault , por, shdndrv....-1ma to +25ma current into out+, out- ....................................................60ma continuous power dissipation (t a = +70?) 32-pin tqfp (derate 14.3mw/? above +70?).........1100mw 28-pin qfn and 28-pin thin qfn (derate 28.7mw/? above +70?) ..............................2300mw 16-pin tssop (derate 27mw/? above +70?) .........2162mw operating temperature range...............................0? to +70? operating junction temperature range ..............0? to +150? processing temperature (die) .........................................+400? storage temperature range .............................-55? to +150? lead temperature (soldering, 10s) .................................+300? 0 v pin v cc total differential signal, peak-to-peak, figure 1a lv = open figure 1a, r mod = 1.82k ? lv = gnd v mon = v cc i ref 2ma, mon = v cc fault = low, v biasdrv 0.6v normal operation (fault = low) en = gnd i oh = -100? common-cathode configuration i ol = 1ma apc loop is closed conditions v md + 5% v md + 20% md high fault threshold v 2.95 ref fault threshold mv 150 por hysteresis 2.65 3.00 v 3.9 4.5 por threshold ? 0.44 6 mon input current ? -2 +0.16 +2 md input current v 0.4 1.2 v 1.55 1.7 1.85 v md md nominal voltage ? -100 +100 ttl input current mv 200 1660 v id ma 52 75 i cc supply current data input voltage swing v 2.45 2.65 2.85 ref voltage ma 0.8 biasdrv current sink ? -1 +1 biasdrv current, shutdown v 2 v ih ttl input high voltage v 0.8 v il ttl input low voltage v 2.4 v oh fault, fault output high voltage v 0.4 v ol fault, fault output low voltage units min typ max symbol parameter common-anode configuration 2v cc - 0.8 md voltage during fault v md - 20% v md - 5% md low fault threshold max3286/max3288/max3296/max3298 mv v cc - v cc - 600 480 mon fault threshold v 0.9 modset, tc fault threshold fault = low, v biasdrv v cc - 1v 0.8 biasdrv current source bias generator (note 1) power-on reset fault detection ma downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers _______________________________________________________________________________________ 3 electrical characteristics (continued)(v cc = +3.0v to +5.5v, t a = 0? to +70?, unless otherwise noted. typical values are at v cc = +3.3v, r tc = open and t a = +25?; see figure 1a.) i shdndrv = 15ma, fault not asserted i shdndrv = 10?, fault asserted max3296 series max3286 series i shdndrv = 1ma, fault not asserted max3286 series max3296 series tempco = max, r mod = open; figure 5 conditions 620 800 980 differential input resistance 4000 modulation-currenttemperature coefficient 0v cc - 1.2 v cc - 0.4 voltage at shdndrv 15 200 shutdown modulation current 24 28 rms random jitter (note 3) 0v cc - 2.4 1.25 data rate units min typ max symbol parameter 2 minimum laser modulationcurrent max3286 series 20% to 80% modulation-current edgespeed max3296 series r mod = 13k ? (i mod = 5ma) max3286 series 46 65 deterministic jitter (note 2) r mod = 4.1k ? (i mod = 15ma) r mod = 1.9k ? (i mod = 30ma) 22 35 r mod = 13k ? (i mod = 5ma) max3296 series 14 35 r mod = 4.1k ? (i mod = 15ma) 82 2 r mod = 1.9k ? (i mod = 30ma) 72 0 c pordly = 0.01?, max3286/max3296 only 3 5.5 (note 4) glitch rejection at md 10 20 22 t fault fault time shutdown laser modulator 50 tempco = min, r tc = open; figure 5 r mod = 13k ? (i mod = 5ma) -15 +15 single ended 42 50 58 output resistance laser safety circuit pordly = open 0.3 1.25 t pordly por delay v cc - 0.3 input bias voltage r l 25 ? 30 maximum laser modulationcurrent r mod = 1.9k ? (i mod = 30ma) -10 +10 tolerance of modulation current v ma ma % ps ps ? ppm/? ? ? v ? ms ? ? 29 45 ps 90 150 130 220 2.5 gbps downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 4 _______________________________________________________________________________________ t ypical operating characteristics (t a = +25?, unless otherwise noted.) por delay vs. c pordly max3286 toc01 capacitance (pf) delay ( s) 10,000 100,000 1 10 100 1000 100 1000 10,000 10 100,000 fltdly duration vs. c fltdly max3286 toc02 capacitance (pf) delay ( s) 10,000 1 10 100 1000 100 1000 10,000 10 1 note 1: common-anode configuration refers to a configuration where pol = gnd, pol = v cc , and an npn device is used to set the laser bias current. common-cathode configuration refers to a configuration where pol = v cc , pol = gnd, and a pnp device is used to set the laser bias current. note 2: deterministic jitter measured with a repeating k28.5 bit pattern 00111110101100000101. deterministic jitter is the peak-to-peak deviation from the ideal time crossings per ansi x3.230, annex a. note 3: for fibre channel and gigabit ethernet applications, the peak-to-peak random jitter is 14.1 times the rms jitter. note 4: delay from a fault on md until fault is asserted high. electrical characteristics (continued)(v cc = +3.0v to +5.5v, t a = 0? to +70?, unless otherwise noted. typical values are at v cc = +3.3v, r tc = open and t a = +25?; see figure 1a.) max3286/max3296 only, figure 1b,c fltdly = open c fltdly = 270pf c fltdly = 0 max3286/max3296 only, figure 1b max3286/max3296 only, figure 1b conditions ns 61 0 t en_reset en or en minimum pulse width required to reset a latchedfault 100 140 ? 0.2 1 t fltdly fltdly duration ? 3.5 5.5 t shutdn shdndrv asserted after en =low or en = high ? 12 t reset fault reset after en, en , or por transition units min typ max symbol parameter eye diagram max3286 toc03 50ps/div 2.5gbps, 1310nm laser, 2 7 - 1 prbs, i mod = 15ma max3286/max3296 only, figure 1b,c fltdly = 0.01? 6 ? downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers _______________________________________________________________________________________ 5 pin description t ypical operating characteristics (continued) (t a = +25?, unless otherwise noted.) en startup (common-anode configuration) max3286 toc04 en optical output biasdrv fault 5 s/div md shutdown max3286 toc05 md optical output shdndrv fault 10 s/div eye diagram max3286 toc06 100ps/div 1.25gbps, 1310nm laser, 2 7 - 1 prbs, i mod = 15ma pin qfn/ thin qfn max3286max3296 tqfp max3286max3296 tssop-ep max3287max3297 max3289 max3299 tssop-ep max3288max3298 name function 11 fault inverting fault indicator. see table 1. 2, 16, 19 n.c. no connect 23 fault noninverting fault indicator. see table 1. 34 por power-on reset. por is a ttl-compatibleoutput. see figure 14. 4, 13, 19 5, 14, 22, 30 1, 6 1, 6 gnd ground 56e n enable ttl input. the laser output is enabledonly when en is high and en is low. if en is left unconnected, the laser is disabled. 67 en inverting enable ttl input. the laser outputis enabled only when en is low or grounded and en is high. if en is left unconnected, the laser is disabled. 78 pordly power-on reset delay. to extend the delayfor the power-on reset circuit, connect a capacitor to pordly. see the design procedure section. downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 6 _______________________________________________________________________________________ pin description (continued) pin qfn/ thin qfn max3286max3296 tqfp max3286max3296 tssop-ep max3287max3297 max3289 max3299 tssop-ep max3288max3298 name function 8922 fltdly fault delay input. determines the delay ofthe fault and fault outputs. a capacitor attached to fltdly ensures proper startup(see the typical operating characteristics ) . fltdly = gnd: holds fault low andfault high. when fltdly = gnd, en = high, en = low, and v cc is within the operational range, the safety circuitry isinactive. 91 0l v low-voltage operation. connect to gnd for4.5v to 5.5v operation. leave open for 3.0v to 5.5v operation (table 2). 10, 22, 23, 26 11, 25, 26, 29 3, 11, 14 3, 11, 14 v cc supply voltage 11 12 4 4 in+ noninverting data input 12 13 5 5 in- inverting data input 14 15 7 7 ref reference voltage. a resistor connected atref to md determines the laser power when apc is used with common-cathode lasers. 15 17 pol polarity input. pol is used for programmingthe laser-pinning polarity (table 4). 16 18 pol inverting polarity input. pol is used for programming the laser-pinning polarity(table 4). 17 20 8 8 md monitor diode connection. md is used forautomatic power control. 18 21 9 mon laser bias current monitor. used forprogramming laser bias current in vcsel applications. 20 23 9 shdndrv shutdown driver output. provides aredundant laser shutdown. 21 24 10 10 biasdrv bias-controlling transistor driver. connectsto the base of an external pnp or npn transistor. downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers _______________________________________________________________________________________ 7 md fault condition v cc v md > 1.15 ? v md(nom) , v md < 0.85 ? v md(nom) lv = gnd and v cc < 4.5v ref en and en v ref > 2.95v pin pol and pol en = low or open, en = high or open pol = pol mon v mon < v cc - 540mv table 1. typical fault conditions >4.5 grounded >3.0 open operating voltage range (v) lv table 2. lv operating range modset and tc v modset and v tc 0.8v pin description (continued) pin qfn/ thin qfn max3286max3296 tqfp max3286max3296 tssop-ep max3287max3297 max3289 max3299 tssop-ep max3288max3298 name function 24 27 12 12 out+ modulation-current output. see the typical application circuits . 25 28 13 13 out- modulation-current output. see the typical application circuits . 27 31 15 15 modset modulation-current set. the resistor atmodset programs the temperature-stable component of the laser modulation current. 28 32 16 16 tc temperature-compensation set. the resistorat tc programs the temperature-increasing component of the laser modulation current. ep ep ep exposed pad ground. this must be soldered to the circuitboard ground for proper thermal performance. see layout considerations . downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 8 _______________________________________________________________________________________ modulation control modset tc l = 3.9nh l = 3.9nhr l = 25 ? biasdrv laser equivalent load (open) out- out+ ferrite bead* *muratablm11ha102 0.01 f 0.01 f in+ in- 50 ? 50 ? 25 ? r l r mod v cc v cc v cc i out i cc v cc i mod 3/2 i mod v id v id = v in+ - v in- current i mod v in- v in+ volts time 100mv p-p min 830mv p-p max 200mv p-p min 1660mv p-p max differential input resulting signal max3286max3296 figure 1a. output load for ac specification v cc por fault fault on md reset by en shutdown by en shdndrv optical out en note: timing is not to scale. t pordly t fault t reset t shutdn t en_reset figure 1b. fault timing _______________detailed description the max3286/max3296 series of laser drivers contain abias generator with apc, laser modulator, power-on reset (por) circuit, and safety circuitry (figures 2a and 2b). bias generator figure 3 shows the bias generator circuitry containing apower-control amplifier, controlled reference voltage, smooth-start circuit, and window comparator. the bias generator combined with an external pnp or npn transis- tor provides dc laser current to bias the laser in a light- emitting state. when there is a monitor diode (md) in the laser package, the apc circuitry adjusts the laser-bias current to maintain average power over temperature and changing laser properties. the md input is connected to downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers _______________________________________________________________________________________ 9 smooth- start in+ in- tc modset r mod v cc r tc mon shdndrv ref por pordly pol pol faultfault fltdly enen 1.97v lv 1.53v +1.7v 50 ? 50 ? controlled reference generator laser modulator modulation current generator 1.7v ref biasdrv md out- out+ por circuit safety circuitry input buffer v cc - 0.54v max3286max3296 bias generator figure 2b. laser driver functional diagram laser modulator por circuit safety bias generator modset tc biasdrv md shdndrv fault fault por lv pordly enen fltdly polpol mon md out- out+ ref in+ in- figure 2a. simplified laser driver functional diagram the anode or cathode of a monitor photodiode or to aresistor-divider, depending on the specific application circuit. three application circuits are supported: common -cathode laser with photodiode, common- cathode laser without photodiode, and common-anodelaser with photodiode (as shown in the design procedure section). the pol and pol inputs determine the laser pinning (common cathode, common anode) (table 4). the smooth-start circuitry prevents current spikes to the laser during power-up or enable; this ensures compliance with safety requirements and extends the life of the laser. the power-control amplifier drives an external transistor to control the laser bias current. in a fault condition, the power-control amplifier? output is disabled (high downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 10 ______________________________________________________________________________________ impedance). this ensures that the pnp or npn transistor is turned off, removing the laser-bias current. (see the applications information section.) the ref pin provides a controlled reference voltagedependent upon the voltage at mon. the voltage at ref is v ref = 2.65 - 2.25(v cc - v mon ). a resistor connected at ref determines the laser power when apc is usedwith common-cathode lasers. see the design procedure section for information about setting the laser power. modulation circuitry the modulator circuitry consists of an input buffer, current generator, and high-speed current switch (figure 4). the modulator drives up to 30ma of modulation current into a 25 ? load. many of the modulator performance specificationsdepend on the total modulator current (i out ) (figure 1a). to ensure good driver performance, the voltage atout+ and out- must not be less than v cc - 1v. the amplitude of the modulation current is set withresistors at the modset and temperature coefficient (tc) pins. the resistor at modset (r mod ) programs the temperature-stable portion of modulation current, whilethe resistor at tc (r tc ) programs the tempera ture- increasing portion of the modulation current. figure 5shows modulation current as a function of temperature for two extremes: r tc is open (the modulation current has zero temperature coefficient) and r mod is open (the modulation temperature coefficient is 4000ppm).intermediate tempco values of modulation current can be obtained as described in the design procedure sec- tion. table 3 is the r tc and r mod selection table. safety circuitry the laser driver can be used with two popular safety systems. apc maintains laser safety using local feed- back. safety features monitor laser driver operation and smooth- start polarity_fault enable window comparator md fault ref_fault monitor_fault v cc - 540mv biasdrv mon pol pol md ref power- control amplifier +1.7v controlled reference voltage v ref = 2.65 - 2.25 (v cc - v mon ) +1.97v 2.95v +1.53v glitch reject enable figure 3. bias generator circuitry v cc current switch input buffer out+ out- in+ in- 50 ? 50 ? 400 ? 400 ? v cc - 0.3v current amplifier 4000ppm/ c reference enable 0.8v tc modset r tc r mod 0.8v tc_fault mod_fault modulation current generator 1.2v reference max3286max3296 figure 4. laser modulator circuitry 53.6 1.69 r mod (k ? ) r tc (k ? ) i mod = 15ma 11.5 26.7 3500 162 r mod (k ? ) r tc (k ? ) i mod = 30ma r mod (k ? ) i mod = 5ma 3.65 r tc (k ? ) tempco (ppm/?) 8.06 3.16 11.3 2.49 18.7 2.0 20.0 4.12 2000 24.9 5.76 2500 16.2 9.53 3000 34.8 13.3 57.6 6.49 5.23 4.32 4.22 13.3 5.11 6.49 6.19 4.32 80.6 2.26 500 13.3 2.67 1000 40.2 3.24 1500 15.8 26.7 19.1 26.7 13.3 8.87 table 3. r tc and r mod selection table downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers ______________________________________________________________________________________ 11 force a shutdown if a fault is detected. the shutdowncondition is latched until reset by a toggle of en, en , or power.another safety system, open fiber control (ofc), uses safety interlocks to prevent eye hazards. to accommo- date the ofc standard, the max3286/max3296 series provide dual enable inputs and dual fault outputs. the safety circuitry contains fault detection, dual enable inputs, latched fault outputs, and a pulse generator (figure 6). safety circuitry monitors the apc circuit to detect unsafe levels of laser emission during single-point failures. a single-point failure can be a short to v cc or gnd or a short between any two ic pins. pulse generator during startup, the laser does not emit light and theapc loop is not closed, triggering a fault signal. to allow startup, an internal fault-delay pulse disables the safety system for a programmable period of time, allowing the driver to begin operation. the length of the pulse is determined by the capacitor connected at fltdly and should be set 5 to 10 times longer than the apc time constant. the internal safety features can be disabled by connecting fltdly to gnd. note that en must be high, en must be low, and v cc must be in the opera- tional range for laser operation. fault detection the max3286/max3296 series has extensive and com-prehensive fault-detection features. all critical nodes are monitored for safety faults, and any node voltage that differs significantly from its expected value results in a fault (table 1). when a fault condition is detected, the laser is shut down. see the applications information section for more information on laser safety. shutdown the laser drivers offer dual redundant bias shutdownmechanisms. the shdndrv output drives an optional external mosfet semiconductor. the bias and modu- lation drivers have separate internal disable signals. latched fault output two complementary fault outputs are provided withthe max3286/max3296 series. in the event of a fault, these outputs latch until one of three events occurs: 1) the power is switched off, then on. v cc fltdlyfault fault shdndrv (from por circuit) ref_fault monitor_fault md_fault polarity_fault tc_fault mod_fault enen enable q r reset dominant fault latch fault detection t fltdly pulse generator max3286max3296 s figure 6. simplified safety circuit schematic 0.6 0.80.7 1.00.9 1.21.1 1.3 02 03 04 0 10 50 60 70 80 90 100 110 junction temperature ( c) i mod /(i mod at+ 52 c) r tc = open tempco = 50ppm/ c r tc 1.9k ? r mod = open tempco = 4000ppm/ c figure 5. modulation current vs. temperature for maximumand minimum temperature coefficient downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 12 ______________________________________________________________________________________ 2) en is switched low, then high.3) en is switched to high, then low. power-on reset (por) figure 7 shows the por circuit for the max3286/max3296 series devices. a por signal asserts low when v cc is in the operating range. the voltage operat- ing range is determined by the lv pin, as shown intable 2. por contains an internal delay to reject noise on v cc during power-on or hot-plugging. the delay can be extended by adding capacitance to the pordlypin. the por comparator includes hysteresis to improve noise rejection. the laser driver is shut down while v cc is out of the operating range. design procedure select laser select a communications-grade laser with a rise time of260ps or better for 1.25gbps, or 130ps or better for 2.5gbps applications. to obtain the max3286/ max3296? ac specifications, the instantaneous output voltage at out+ must remain above v cc - 1v at all times. select a high-efficiency laser that requires low modulation current and generates low-voltage swing atout+. laser package inductance can be reduced by trimming the leads. typical package leads have induc- tance of 25nh/in (1nh/mm); this inductance causes a larger voltage swing across the laser. a compensation fil- ter network also can be used to reduce ringing, edge speed, and voltage swing. programming the modulation current resistors at the modset and tc pins set the ampli- tude of the modulation current. the resistor r mod sets the temperature-stable portion of the modulation cur- rent, while the resistor r tc sets the temperature- increasing portion of the modulation current. to determine the appropriate temperature coefficient from the slope efficiency ( ) of the laser, use the following equation:where is the slope of the laser output power to the laser current.for example, suppose a laser has a slope efficiency 25 of 0.021mw/ma at +25?, which reduces to 0.018mw/ma at +70?. using the above equation pro-duces a laser tempco of -3175ppm/?. to obtain the desired modulation current and tempco for the device, the following two equations can be used to determine the required values of r mod and r tc : where tempco = -laser tempco.figure 8a shows a family of curves derived from these equations. the straight diagonal lines depict constant tempcos. the curved lines represent constant modula- tion currents. if no temperature compensation is desired, figure 8b displays a series of curves that show laser modulation current with respect to r mod for different loads.the following useful equations were used to derive figure 8a and the equations at the beginning of this section. the first assumes r l = 25 ? . programming the bias current/apc three application circuits are described below: com- mon-cathode laser with photodiode, common-cathode laser without photodiode, and common-anode laser iii tempco c c a mod c mod c mod c () () () () () 70 25 25 70 25 =+ [] i rr tc a mod mod tc = +? + +? + () ?? ?? ?? ?? ? ? ?? ?? ? ? [] 51 115 250 106 250 140 10 25 3 .. . r r empco empco mod tc = +? ? () (. ) 250 52 019 48 250 t t r tempco i tc mod = () ? 021 250 . laser tempco = [] 70 25 25 6 70 25 10 () / cc ppm c v cc pordly por 1.2v 36k ? 25k ? 28k ? lv variable delay bandgap = 0.7s/ f c pordly max3286max3296 figure 7. power-on reset circuit downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers ______________________________________________________________________________________ 13 with photodiode. the pol and pol inputs determine the laser pinning (common cathode, common anode)and affect the smooth-start circuits (table 4). common cathode with photodiode (optical feedback) in the common cathode with photodiode configuration,a servo control loop is formed by external pnp q1, the laser diode, the monitor diode, r set , and the power- control amplifier (figure 9). the voltage at md is stabi- lized to 1.7v. the monitor photodiode current (i d ) is set by (v ref - v md ) / r set = 0.95 / r set . determine the desired monitor current (i d ), then select r set = 0.95 / i d . the apc loop is compensated by c biasdrv . a capacitor must be placed from biasdrv to v cc to ensure low- noise operation and to reject power-supply noise. thetime constant governs how quickly the laser bias current reacts to a change in the average total laser current (i biasdrv + i mod ). a capacitance of 0.1? is sufficient to obtain a loop time constant in excess of 1?, provid-ed that r deg is chosen appropriately. resistor r deg might be necessary to ensure the apc loop? stabilitywhen low bias currents are desired. the voltage across r deg should not be larger than 250mv at maximum bias current.the discrete components used with the common cath- ode with photodiode configuration are: r set = 0.95 / i d c biasdrv = 0.1? (typ) r deg = 0.25 / i bias(max) pol description max3286/max3296 v cc common cathode withphotodiode device table 4. pol pin setup for each laser configuration type pol gnd laser pinning max3287/max3297 max3286/max3296 v cc common cathode without photodiode max3288/max3298 gnd max3286/max3296 gnd common anode withphotodiode max3289/max3299 v cc max3286/max3296 v cc v cc not allowed; fault occurs max3286/max3296 gnd gnd not allowed; fault occurs v cc 1000 1 1 100 1000 10 r mod (k ? ) r tc (k ? ) 10 3500ppm 3000ppm 2000ppm 2500ppm 1000ppm 1500ppm 500ppm 5ma 10ma 15ma 20ma 25ma 30ma r l = 25 ? figure 8a. r tc vs. r mod for various conditions 0 10 5 2015 3530 25 40 04 26 8 1 0 1 214 r mod (k ? ) laser modulation current (i mod ) (ma) note: r tc = open 10 ? load 25 ? load 50 ? load figure 8b. laser-modulation current vs. r mod downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers q1 = general-purpose pnp, >100, f t > 5mhz b1 = ferrite bead (see bias filter section) m1 = general-purpose pmos device (optional) common cathode with current feedback in the common-cathode configuration with current feed-back, a servo control loop is formed by an external pnp transistor (q1), r mon , the controlled-reference voltage block, r set , r md , and the power-control amplifier (figure 10). the voltage at md is stabilized to 1.7v. thevoltage at mon is set by the resistors r set and r md . as in the short-wavelength configuration, a 0.1? c biasdrv connected between biasdrv and v cc is sufficient to obtain an approximate 1? apc loop time constant. this improves power-supply noise rejection.to select the external components: 1) determine the required laser bias current i bias = i th + i mod / 2 2) select r md and r set . maxim recommends r set = 1k ? , r md = 5k ? , which results in v cc - v mon 250mv. 3) select r mon where r mon = 250mv / i bias , assuming r set = 1k ? and r md = 5k ? . v cc v cc r deg v cc controlled reference voltage v ref = 2.65v ref only max3286/96 shdndrv c biasdrv biasdrv mon m1 q1 pol md power-controlamplifier laser i bias photo diode i d ferrite bead b1 1.7v smooth- start v cc r set pol max3286max3287 max3296 max3297 figure 9. common-cathode laser with photodiode v cc r mon v cc controlled reference voltage v ref = 2.65v - 2.25v (v cc - v mon ) ref max3286/96 only shdndrv c biasdrv biasdrv mon m1 q1 pol md power-controlamplifier i bias i d ferrite bead b1 1.7v smooth- start v cc r set r md pol max3286max3288 max3296 max3298 laser figure 10. common cathode with current feedback (pnp configuration) 14 ______________________________________________________________________________________ downloaded from: http:///
______________________________________________________________________________________ 15 max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers v cc v cc max3286/96 only shdndrv c biasdrv biasdrv mon laser q1 pol md power-controlamplifier i bias i d ferritebead b1 monitor diode 1.7v smooth- start v cc v cc r deg r set pol max3286max3289 max3296 max3299 figure 12. common anode with photodiode the relationship between laser bias current and r mon is shown in figure 11. the remaining discrete compo-nents used with the common cathode without photodi- ode configuration are as follows: q1 = general-purpose pnp, >100, f t > 5mhz b1 = ferrite bead (see the bias filter section) m1 = general-purpose pmos device (optional)c biasdrv = 0.1? (typ) common anode with photodiode in the common-anode configuration with photodiode, a servo control loop is formed by an external npn transis- tor (q1), the laser diode, the monitor diode, r set , and the power-control amplifier. the voltage at md is stabi- lized to 1.7v. the monitor photodiode current is set by i d = v md / r set (figure 12). determine the desired mon- itor current (i d ), then select r set = 1.7v / i d . c biasdrv and a degeneration resistor (r deg ) must be connected to the bias transistor (in this case npn) toobtain the desired apc loop time constant. this improves power-supply (and ground) noise rejection. a capacitance of 0.1? is sufficient to obtain time con- stants of up to 5s in most cases. the voltage across r deg should not be larger than 250mv at maximum bias current.the discrete components used with the common anode with photodiode configuration are summarized as follows: r set = 1.7 / i d c biasdrv = 0.1? (typ) r deg = 0.25 / i bias(max) q1 = general-purpose npn, > 100, f t > 5mhz b1 = ferrite bead (see the bias filter section) m1 = general-purpose pmos (optional) programming por delay a capacitor can be added to pordly to increase thedelay for which por is asserted low (meaning that v cc is within the operational range) when powering up thepart. the delay is approximately: see the typical operating characteristics. t c s pordly = () [] 1410 6 . 100 0.1 10 1k 10k 1 10 r mon ( ? ) laser bias current (ma) 100 r set = 1k ? r md = 5k ? figure 11. common cathode without photodiode laser downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 16 ______________________________________________________________________________________ designing the bias filter and output pullup beads to reduce deterministic jitter, add a ferrite-bead induc- tor between the collector of the biasing transistor and either the anode or the cathode of the laser, depending on type (see the typical operating characteristics ). use a fer rite-bead inductor with an impedance >100 ? between ?= 10mhz and ?= 2ghz, and a dc resistance < 3 ? . maxim recommends the murata blm11ha102sg. these inductors are also desirablefor tying the out+ and out- pins to v cc . designing the laser-compensation filter network laser package inductance causes the laser impedance to increase at high frequencies, leading to ringing, over- shoot, and degradation of the output eye pattern. a laser- compensation filter network can be used to reduce the output load seen by the laser driver at high frequencies, thereby reducing output ringing and overshoot. the compensation components (r comp and c comp ) are most easily determined by experimentation. beginwith r comp = 25 ? and c comp = 2pf. increase c comp until the desired transmitter eye is obtained (figure 13). quick shutdown to reduce laser shutdown time, a fet device can beattached to shdndrv as shown in figure 10. this pro- vides a typical laser power shutdown time of less than 10?. applications information laser safety and iec 825 the international electrotechnical commission (iec)determines standards for hazardous light emissions from fiber optic transmitters. iec 825 defines the maxi- mum light output for various hazard levels. the max3286/ max3296 series provides features that facilitate compli- ance with iec 825. a common safety requirement is single-point fault toler-ance, whereby one unplanned short, open, or resistive connection does not cause excess light output. when these laser drivers are used, as shown in the typical application circuits , the circuits respond to faults as listed in table 5.using these laser drivers alone does not ensure that a transmitter design is compliant with iec 825. the entire transmitter circuit and component selections must be considered. customers must determine the level of fault tolerance required by their applications, recognizing that maxim products are not designed or authorized for useas components in systems intended for surgical implant into the body, for applications intended to support or sus- tain life, or for any other application where the failure of a maxim product could create a situation where per- sonal injury or death may occur. layout considerations the max3286/max3296 series comprises high-fre- quency products. their performance depends largely upon the circuit board layout. use a multilayer circuit board with a dedicated ground plane. use short laser package leads placed close to the modulator outputs. power supplies must be capaci- tively bypassed to the ground plane with surface-mount capacitors placed near the power-supply pins. the dominant pole of the apc circuit is normally locat- ed at biasdrv. to prevent a second pole in the apc (which can lead to oscillations), ensure that parasitic capacitance at md is minimized. common questions las er output is ringing or contains overshoot. this often is caused by inductive laser packaging. try reducing the length of the laser leads. modify the compensation com- ponents to reduce the driver? output edge speed (see design procedure ). extreme ringing can be caused by low voltage at the out pins. this might indicate that pullup beads or a lower modulation current are needed. low-frequency oscillation on the laser output . this is more prevalent at low temperatures. the apc might beoscillating. try increasing the value of c biasdrv or increasing the value of r deg . ensure that the parasitic capacitance at the md node is kept very small (<10pf). the apc is not needed . connect fltdly to ground to disable fault detection. connect md to ref and mon tov cc . biasdrv and shdndrv can be left open. time uncompensated correctly compensated overcompensated power figure 13. laser compensation downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers ______________________________________________________________________________________ 17 pin name circuit response to overvoltage or short to v cc circuit response to undervoltage or short to ground en normal condition for circuit operation fault state* occurs does not affect laser power fault does not affect laser power does not affect laser power por does not affect laser power normal condition for circuit operation en fault state* occurs fault state* occurs pordly does not affect laser power fault state* occurs if v cc is less than +4.5v lv does not affect laser power if pol is a ttl low, a fault state* occurs; other- wise, the circuit is in normal operation pol if pol is a ttl high, a fault state* occurs; other- wise, the circuit is in normal operation mon (also max3288/ max3298) in common cathode without photodiode configura-tion, a fault state* occurs; otherwise, does not affect laser power fault state* occurs if pol is a ttl low, a fault state* occurs; other-wise, the circuit is in normal operation pol if pol is a ttl high, a fault state* occurs; other-wise, the circuit is in normal operation does not affect laser power shdndrv (also max3287/ max3297/max3289/ max3299 does not affect laser power. if optional fet is used,the laser output is shut off. fltdly any fault that occurs cannot be reset. does notaffect laser power. does not affect laser power does not affect laser power in+, in- does not affect laser power in common-cathode configurations, a fault state*occurs; otherwise, does not affect laser power ref fault state* occurs fault state* occurs md fault state* occurs out+, out- does not affect laser power does not affect laser power fault state* occurs modset does not affect laser power in common-anode configurations, the laser biascurrent is shut off. in common cathode, high laser power triggers a fault state.* shutdown occurs if a shutdown fet (m1) is used (figures 9, 10). biasdrv in common-cathode configurations, the laser biascurrent is shut off. in common anode, high laser power triggers a fault state.* shutdown occurs if a shutdown fet (m1) is used. if shutdown fet is not used, other means must be used to prevent high laser power. fault state* occurs tc does not affect laser power table 5. circuit response to various single-point faults* a fault state asserts the fault pins, disables the modulator outputs, disables the bias output, and asserts the shdndrv pin. fault does not affect laser power does not affect laser power downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 18 ______________________________________________________________________________________ the modulator is not needed . leave tc and modset open. connect in+ to vcc, in- to ref, and leave out+and out?open. wirebonding die the max3286/max3296 series uses bondpads with goldmetalization. make connections to the die with gold wire only, using ball-bonding techniques. wedge bonding is not recommended. bondpad size is 4 mil square. die thickness is typically 15 mils (0.38mm). interface models figures 14?8 show typical input/output models for the max3286/max3296 series of laser drivers. if dice are used, replace the package parasitic elements with bondwire parasitic elements. 4k ? 2.5k ? v cc fault, fault, por max3286max3296 figure 14. logic outputs 10k ? 550 ? 60 ? v cc shdndrv max3286max3296 figure 15. shdndrv output package v cc v cc 1.5nh out- 0.2pf 1.5nh 0.2pf out+ 50 ? 50 ? package 1pf 1pf figure 16. modulator outputs downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers ______________________________________________________________________________________ 19 40 ? 40 ? v cc biasdrv max3286max3296 figure 18. biasdrv output q1 q2 1.5nh1.5nh input common-mode voltage v cc - 0.3v r in q1, q2 > 100k ? package 0.2pf 0.2pf v cc v cc v cc 400 ? 400 ? 1pf 1pf in+ in- max3286max3296 figure 17. data inputs downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 20 ______________________________________________________________________________________ * dice are designed to operate from t j = 0? to +110?, but are tested and guaranteed only at t a = +25?. ** exposed pad. *** package code: g2855-1 **** package code: t2855-7 + denotes lead-free package. selector guide ordering information (continued) part temp range pin-package max3286c/d 0? to +70? dice* max3287 cue 0? to +70? 16 tssop-ep** max3288 cue 0? to +70? 16 tssop-ep** max3289 cue 0? to +70? 16 tssop-ep** max3296 cti+ 0? to +70? 28 thin qfn(5mm x 5mm)**** max3296cgi 0? to +70? 28 qfn(5mm x 5mm)*** max3296chj 0? to +70? 32 tqfp(5mm x 5mm) max3296c/d 0? to +70? dice* max3297 cue 0? to +70? 16 tssop-ep** max3298 cue 0? to +70? 16 tssop-ep** max3299 cue 0? to +70? 16 tssop-ep** data rate/device laser configuration common anode with photodiode common cathode with photodiode common cathode with photodiode 1.25gbps 2.5gbps longwave shortwave or vcsel vcsel package max3286 max3296 ??? 32 tqfp/28 qfn/28 thin qfn/dice max3287 max3297 ? 16 tssop-ep max3288 max3298 ? 16 tssop-ep max3289 max3299 ? 16 tssop-ep downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers ______________________________________________________________________________________ 21 1615 14 13 12 11 10 9 12 34 5 6 7 8 gnd tc modsetv cc out-out+ v cc biasdrvmon max3288max3298 tssop-ep* fltdly v cc gnd in+ in- ref md 1615 14 13 12 11 10 9 12 34 5 6 7 8 gnd tc modsetv cc out-out+ v cc biasdrvshdndrv max3287max3289 max3297 max3299 tssop-ep* fltdly v cc gnd in+ in- ref md *exposed pad is connected to gnd. max3286max3296 tqfp 32 28 29 30 31 25 26 27 modsetgnd v cc out- tcout+ v cc v cc 10 13 15 14 16 11 12 9 fltdly v cc lv in- in+ ref gnd n.c. 17 18 19 20 21 22 23 shdndrv 24 biasdrvgnd mon mdn.c. pol pol 2 3 4 5 6 7 8 pordly en gnd por fault n.c. 1 fault en 2827 26 25 24 23 22 tcmodset v cc out-out+ v cc v cc 89 1011 12 13 14 fltdly lv v cc in+ in- gnd ref 15 16 17 18 19 20 21 pol pol md mon gnd shdndrv biasdrv 7 6 5 4 3 2 1 pordly en en gnd por fault fault max3286max3296 qfn* top view pin configurations (continued) downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 22 ______________________________________________________________________________________ t ypical application circuits pol in- pol fltdly fault fault por en en in+ out- out+ md ref mon modset tc gnd shdndrv biasdrv pordly v cc 115 ? +3.0v to +5.5v ferrite bead pmosfet(optional) pnp transistor 25 ? 0.01 f r tc r mod r set 0.01 f 0.01 f c comp data input c biasdrv 0.1 f lv v cc r comp 0.01 f v cc max3286max3296 0.01 f max3286/max3296 common-cathode vcsel with photodiode 0.01 f 0.01 f pol in- pol fltdly fault por en en in+ out- out+ md ref modset tc gnd biasdrv pordly v cc 115 ? +3.0v to +5.5v ferrite bead pnp transistor 25 ? 0.01 f r tc r mod r set 1k ? 0.01 f 0.01 f c comp data input c biasdrv 0.1 f lv v cc r comp 0.01 f v cc max3286max3296 0.01 f mon r mon shdndrv r md 5k ? fault max3286/max3296 common-cathode vcsel without photodiode 0.01 f 0.01 f downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers ______________________________________________________________________________________ 23 t ypical application circuits (continued) pol in- pol fltdly fault fault por en en in+ out- out+ md ref mon modset tc gnd shdndrv biasdrv pordly v cc 115 ? +3.0v to +5.5v ferrite bead npntransistor 25 ? 0.01 f r tc r mod r set r deg 0.01 f 0.01 f c comp data input lv v cc r comp 0.01 f v cc max3286max3296 0.01 f c biasdrv 0.1 f max3286/max3296 common-anode laser with photodiode 0.01 f 0.01 f 18 ? in- fltdly in+ out- out+ md ref modset tc gnd shdndrv biasdrv v cc 115 ? +3.0v to +5.5v ferrite bead pnp transistor 25 ? 0.01 f r tc r mod r set r deg 0.01 f 0.01 f c comp data input c biasdrv 0.1 f r comp 0.01 f max3287max3297 max3287/max3297 common-cathode vcsel with photodiode v cc v cc 0.01 f 0.01 f downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 24 ______________________________________________________________________________________ t ypical application circuits (continued) in- fltdly in+ out- out+ md ref modset tc gnd biasdrv v cc 115 ? +3.0v to +5.5v ferrite bead pnp transistor 25 ? 0.01 f r tc r mod r set 1k ? 0.01 f c comp data input c biasdrv 0.1 f r comp 0.01 f max3288max3298 mon r mon r md 5k ? 0.01 f max3288/max3298 common-cathode vcsel without photodiode v cc v cc 0.01 f 0.01 f in- fltdly in+ out- out+ md ref modset tc gnd shdndrv biasdrv v cc 115 ? +3.0v to +5.5v ferrite bead npntransistor 25 ? 0.01 f r tc r mod r set r deg 0.01 f 0.01 f c comp data input v cc r comp c biasdrv 0.1 f 0.01 f v cc max3289max3299 18 ? max3289/max3299 common-anode laser with photodiode 0.01 f 0.01 f downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers ______________________________________________________________________________________ 25 tcv cc out-out+ v cc v cc lv v cc in+ in- gnd ref 0.053" (1.346mm) mon pol gnd md pol gnd en por en n.c. 0.072" (1.829mm) shdndrv biasdrv modset fault fault pordly fltdly hf34z-1z tcv cc v cc v cc lv v cc in+ in- gnd ref mon pol gnd md pol gnd en por en n.c. 0.072" (1.829mm) shdndrv biasdrv modset fault fault pordly fltdly hf34z 0.053" (1.346mm) out-out+ chip topographies transistor count: 1154substrate connected to gnd transistor count: 1154substrate connected to gnd max3286 max3296 downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers 26 ______________________________________________________________________________________ 32l,tqfp.eps f 1 2 21-0079 package outline,32l tqfp, 5x5x1.0mm, ep option f 2 2 21-0079 package outline,32l tqfp, 5x5x1.0mm, ep option package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers ______________________________________________________________________________________ 27 32l qfn.eps package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) downloaded from: http:///
max3286?ax3289/max3296?ax3299 3.0v to 5.5v, 1.25gbps/2.5gbps lan laser drivers maxim makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does maxim assume any lia- bility arising out of the application or use of any product or circuit and specifically disclaims any and all liability, including without limitation consequential or incidental damages. ?ypical?parameters can and do vary in different applications. all operating parameters, including ?ypicals?must be validated for each customer application by customer? technical experts. maxim products are not designed, intended or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the maxim product could create a situation where personal injury or death may occur. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 28 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. qfn thin.eps d2 (nd-1) x e e d c pin # 1 i.d. (ne-1) x e e/2 e 0.08 c 0.10 c a a1 a3 detail a e2/2 e2 0.10 m c a b pin # 1 i.d. b 0.35x45 d/2 d2/2 l c l c e e l c c l k l l detail b l l1 e xxxxx marking h 1 2 21-0140 package outline,16, 20, 28, 32, 40l thin qfn, 5x5x0.8mm -drawing not to scale- l e/2 common dimensions 3.35 3.15 t2855-1 3.25 3.35 3.15 3.25 max. 3.20 exposed pad variations 3.00 t2055-2 3.10 d2 nom. min. 3.20 3.00 3.10 min. e2 nom. max. ne nd pkg. codes 1. dimensioning & tolerancing conform to asme y14.5m-1994. 2. all dimensions are in millimeters. angles are in degrees.3. n is the total number of terminals. 4. the terminal #1 identifier and terminal numbering convention shall conform to jesd 95-1 spp-012. details of terminal #1 identifier are optional, but must be located within the zone indicated. the terminal #1 identifier may be either a mold or marked feature. 5. dimension b applies to metallized terminal and is measured between 0.25 mm and 0.30 mm from terminal tip. 6. nd and ne refer to the number of terminals on each d and e side respectively.7. depopulation is possible in a symmetrical fashion. 8. coplanarity applies to the exposed heat sink slug as well as the terminals. 9. drawing conforms to jedec mo220, except exposed pad dimension for t2855-1, t2855-3, and t2855-6. notes: symbol pkg. n l1 e e d b a3 a a1 k 10. warpage shall not exceed 0.10 mm. jedec t1655-1 3.20 3.00 3.10 3.00 3.10 3.20 0.70 0.800.75 4.904.90 0.25 0.25 0 -- 4 whhb 4 16 0.35 0.30 5.105.10 5.00 0.80 bsc. 5.00 0.05 0.20 ref. 0.02 min. max. nom. 16l 5x5 3.10 t3255-2 3.00 3.20 3.00 3.10 3.20 2.70 t2855-2 2.60 2.60 2.80 2.70 2.80 l 0.30 0.50 0.40 -- - -- - whhc 20 5 5 5.00 5.00 0.300.55 0.65 bsc. 0.45 0.25 4.904.90 0.25 0.65 -- 5.105.10 0.35 20l 5x5 0.20 ref. 0.750.02 nom. 0 0.70 min. 0.05 0.80 max. -- - whhd-1 28 7 7 5.00 5.00 0.250.55 0.50 bsc. 0.45 0.25 4.904.90 0.20 0.65 -- 5.105.10 0.30 28l 5x5 0.20 ref. 0.750.02 nom. 0 0.70 min. 0.05 0.80 max. -- - whhd-2 32 8 8 5.00 5.00 0.40 0.50 bsc. 0.30 0.25 4.904.90 0.50 -- 5.105.10 32l 5x5 0.20 ref. 0.750.02 nom. 0 0.70 min. 0.05 0.80 max. 0.20 0.25 0.30 down bonds allowed no yes 3.10 3.00 3.20 3.10 3.00 3.20 t2055-3 3.10 3.00 3.20 3.10 3.00 3.20 t2055-4 t2855-3 3.15 3.25 3.35 3.15 3.25 3.35 t2855-6 3.15 3.25 3.35 3.15 3.25 3.35 t2855-4 2.60 2.70 2.80 2.60 2.70 2.80 t2855-5 2.60 2.70 2.80 2.60 2.70 2.80 t2855-7 2.60 2.70 2.80 2.60 2.70 2.80 3.20 3.00 3.10 t3255-3 3.20 3.00 3.10 3.20 3.00 3.10 t3255-4 3.20 3.00 3.10 nono no no nono no no yesyes yes yes 3.20 3.00 t1655-2 3.10 3.00 3.10 3.20 yes no 3.20 3.10 3.00 3.10 t1655n-1 3.00 3.20 3.35 3.15 t2055-5 3.25 3.15 3.25 3.35 yes 3.35 3.15 t2855n-1 3.25 3.15 3.25 3.35 no 3.35 3.15 t2855-8 3.25 3.15 3.25 3.35 yes 3.20 3.10 t3255n-1 3.00 no 3.20 3.10 3.00 l 0.400.40 **** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** ** see common dimensions table 0.15 11. marking is for package orientation reference only. h 2 2 21-0140 package outline,16, 20, 28, 32, 40l thin qfn, 5x5x0.8mm -drawing not to scale- 12. number of leads shown are for reference only. 3.30 t4055-1 3.20 3.40 3.20 3.30 3.40 ** yes 0.05 00.02 0.60 0.40 0.50 10 ----- 0.30 4010 0.40 0.50 5.10 4.90 5.00 0.25 0.35 0.45 0.40 bsc. 0.154.90 0.250.20 5.00 5.10 0.20 ref. 0.70 min. 0.75 0.80 nom. 40l 5x5 max. 13. lead centerlines to be at true position as defined by basic dimension "e", 0.05. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline information, go to www.maxim-ic.com/packages .) downloaded from: http:///

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