1 precision edge ? sy58032u micrel, inc. m9999-020707 hbwhelp@micrel.com or (408) 955-1690 description precision 1:8, lvpecl fanout buffer guaranteed ac performance over temperature and voltage: ? clock frequency range: dc to 4ghz ? <110ps t r /t f times ? <330ps t pd ? <20ps skew low-jitter performance: ? <10ps pp total jitter (clock) ? <1ps rms random jitter 100k lvpecl compatible outputs fully differential inputs/outputs accepts an input signal as low as 100mv unique input termination and v t pin accepts dc- coupled and ac-coupled differential inputs: (lvpecl, lvds, and cml) power supply 2.5v 5% or 3.3v 10% industrial temperature range: C40 c to +85 c available in 32-pin (5mm 5mm) mlf ? package features ultra-precision 1:8 fanout buffer with lvpecl outputs and internal termination precision edge ? sy58032u applications all sonet and all gige clock distribution all fibre channel clock and data distribution network routing engine timing distribution high-end, low-skew multiprocessor synchronous clock distribution rev.: d amendment: /0 issue date: february 2007 the sy58032u is a 2.5v/3.3v precision, high-speed, fully differential lvpecl 1:8 fanout buffer. the sy58032u is optimized to provide eight identical output copies with less than 20ps of skew and less than 10ps pp total jitter. it can process clock signals as fast as 4ghz. the differential input includes micrels unique, 3-pin input termination architecture that allows the sy58032u to directly interface to lvpecl, cml, and lvds differential signals (ac- or dc-coupled) without any level-shifting or termination resistor networks in the signal path. the result is a clean, stub-free, low-jitter interface solution. the lvpecl (100k temperature compensated) outputs feature 800mv typical swing into 50 ? loads, and provide an extremely fast rise/fall time guaranteed to be less than 110ps. the sy58032u operates from a 2.5v 5% supply or 3.3v 10% supply and is guaranteed over the full industrial temperature range (C40 c to +85 c). for applications that require a higher high-speed 1:8 fanout buffer, consider the sy58031u or sy58033u. the sy58032u is part of micrels high-speed, precision edge ? product line. all support documentation can be found on micrels web site at www.micrel.com. functional block diagram precision edge is a registered trademark of micrel, inc. micro leadframe and mlf are registered trademarks of amkor technology, inc. precision edge ? q1 /q1 q0 /q0 in /in v t 50 ? 50 ? v ref-ac q3 /q3 q2 /q2 q5 /q5 q4 /q4 q7 /q7 q6 /q6
2 precision edge ? sy58032u micrel, inc. m9999-020707 hbwhelp@micrel.com or (408) 955-1690 package/ordering information pin number pin name pin function 3, 6 in, /in differential signal input: each pin of this pair internally terminates with 50 ? to the v t pin. note that this input will default to an indeterminate state if left open. see input interface applications section. 4v t input termination center-tap: each input terminates to this pin. the v t pin provides a center-tap for each input (in, /in) to the termination network for maximum interface flexibility. see input interface applications section. 2, 7, 17, 24 gnd, ground. exposed pad must be connected to a ground plane that is the same potential exposed pad as the ground pin. 1, 8, 9, 16, vcc positive power supply: bypass with 0.1 f ?? 0.01 f low esr capacitors as close to the 18, 23, 25, 32 pins as possible. 31, 30, 29, 28, 27, q0, /q0, q1, /q1, 100k lvpecl differential output pairs: differential buffered output copy of the 26, 22, 21, 20, 19, q2, /q2, q3, /q3, input signal. the lvpecl output swing is typically 800mv into 50 ? . unused output pairs 15, 14, 13, 12, q4, /q4, q5, /q5, may be left floating with no impact on jitter. see lvpecl output section. 11, 10 q6, /q6, q7, /q7 5 vref-ac bias reference voltage: equal to v cc C1.2v (typical), and used for ac-coupled applications. see input interface applications section. when using v ref-ac , bypass with 0.01 f capacitor to v cc . maximum sink/source current is 0.5ma. pin description 24 23 22 21 20 19 18 17 gnd vcc q3 /q3 q4 /q4 vcc gnd vcc gnd in vt vref-ac /in gnd vcc 1 2 3 4 5 6 7 8 910111213141516 32 31 30 29 28 27 26 25 /q1 q1 /q0 q0 vcc q2 /q2 vcc q6 /q6 q7 /q7 vcc /q5 q5 vcc 32-pin mlf ? (mlf-32) ordering information (1) package operating package lead part number type range marking finish sy58032umi mlf-32 industrial sy58032u sn-pb sy58032umitr (2) mlf-32 industrial sy58032u sn-pb sy58032umg (3) mlf-32 industrial sy58032u with pb-free pb-free bar-line indicator nipdau sy58032umgtr (2, 3) mlf-32 industrial sy58032u with pb-free pb-free bar-line indicator nipdau notes: 1. contact factory for die availability. dice are guaranteed at t a = 25 c, dc electricals only. 2. tape and reel. 3. pb-free package recommended for new designs.
3 precision edge ? sy58032u micrel, inc. m9999-020707 hbwhelp@micrel.com or (408) 955-1690 absolute maximum ratings (1) power supply voltage (v cc ) ...................... C0.5v to +4.0v input voltage (v in ) ......................................... C0.5v to v cc current (v t ) source or sink current on v t pin ........................ 100ma input current (v t ) source or sink current on in, /in .......................... 50ma current (v ref ) source or sink current on v ref-ac (3) ....................... 1.5ma lead temperature soldering, (20 sec.) .................... 260 c storage temperature range (t s ) ........... C65 c to +150 c operating ratings (2) power supply voltage (v cc ) ................. +2.375v to +3.60v ambient temperature range (t a ) ............. C40 c to +85 c package thermal resistance (4) mlf ? ( ja ) still-air ............................................................. 35 c/w mlf ? ( jb ) junction-to-board ............................................ 20 c/w symbol parameter condition min typ max units v cc power supply voltage 2.5v nominal 2.375 2.5 2.625 v 3.3v nominal 3.0 3.3 3.6 v i cc power supply current v cc = max. no load. includes current 190 250 ma through 50 ? pull-ups. v ih input high voltage in, /in v cc C1.2 v cc v v il input low voltage in, /in 0 v ih C0.1 v v in input voltage swing in, /in, see figure 1a. 0.1 1.7 v v diff_in differential input voltage swing in, /in, see figure 1b. 0.2 v |in0, /in0|, |in1, /in1| r in in-to-v t resistance 40 50 60 ? v t in max. in-to-v t (in, /in) 1.28 v v ref-ac v cc C1.3 v cc C1.2 v cc C1.1 v dc electrical characteristics (5) t a = C40 c to +85 c v cc = 2.5v 5% or 3.3v 10%; r l = 50 ? to v cc C2v; t a = C40 c to +85 c, unless otherwise stated. symbol parameter condition min typ max units v oh output high voltage v cc C1.145 v cc C0.895 v v ol output low voltage v cc C1.945 v cc C1.695 v v out output voltage swing see figure 1a. 500 800 mv v diff_out differential voltage swing see figure 1b. 1000 1600 2000 mv notes: 1. permanent device damage may occur if absolute maximum ratings are exceeded. this is a stress rating only and functional oper ation is not implied at conditions other than those detailed in the operational sections of this data sheet. exposure to absolute maximum ratings c onditions for extended periods may affect device reliability. 2. the data sheet limits are not guaranteed if the device is operated beyond the operating ratings. 3. due to the limited drive capability, use for input of the same package only. 4. thermal performance assumes exposed pad is soldered (or equivalent) to the devices most negative potential (gnd) on the pcb. jb uses 4-layer ja in still-air number unless otherwise stated. 5. the circuit is designed to meet the dc specifications shown in the above tables after thermal equilibrium has been establishe d. lvpecl dc electrical characteristics (5)
4 precision edge ? sy58032u micrel, inc. m9999-020707 hbwhelp@micrel.com or (408) 955-1690 single-ended and differential swings v in , v out 800mv (typ.) figure 1a. single-ended voltage swing v diff_in , v diff_out 1.6v (typ.) figure 1b. differential voltage swing v cc = 2.5v 5% or 3.3v 10%; r l = 50 ? to v cc C2v; t a = C40 c to +85 c, unless otherwise stated. symbol parameter condition min typ max units f max maximum operating frequency v out 400mv clock 4 ghz t pd propagation delay (in-to-q) 180 260 330 ps t pd tempco differential propagation delay 35 fs/ c temperature coefficient t skew output-to-output skew (within device) note 8 720ps part-to-part skew note 9 100 ps t jitter clock cycle-to-cycle jitter note 10 1ps rms total jitter (clock) note 11 10 ps pp random jitter (rj) note 12 1ps rms t r , t f output rise/fall time 20% to 80%, at full output swing. 35 75 110 ps notes: 7. high frequency ac electricals are guaranteed by design and characterization. all outputs loaded with 50 ? to v cc C 2v, v in 100mv. 8. output-to-output skew is measured between outputs under identical transitions. 9. part-to-part skew is defined for two parts with identical power supply voltages at the same temperature and with no skew of t he edges at the respective inputs. part-to-part skew includes variation in t pd . 10. cycle-to-cycle jitter definition: the variation of periods between adjacent cycles, t n Ct nC1 where t is the time between rising edges of the output signal. 11. total jitter definition: with an ideal clock input of frequency f max , no more than one output edge in 10 12 output edges will deviate by more than the specified peak-to-peak jitter value. 12. random jitter is measured with a k28.7 comma detect character pattern, measured at 1.25gbps and 2.5gbps. ac electrical characteristics (7) timing diagram /in in /q q t pd t pd v in v out
5 precision edge ? sy58032u micrel, inc. m9999-020707 hbwhelp@micrel.com or (408) 955-1690 typical operating characteristics 200mhz output output swing (200mv/div.) time (600ps/div.) 1.25ghz output output swing (200mv/div.) time (100ps/div.) 0 100 200 300 400 500 600 700 800 900 0 1000 2000 3000 4000 5000 6000 7000 8000 amplitude (mv) frequency (mhz) amplitude vs. frequenc y v in = 400mv 0 0.5 1 1.5 2 2.5 -60 -40 -20 0 20 40 60 80 100 skew (ps) temperature ( c) output-to-output skew vs. temperature 230 235 240 245 250 255 260 265 0 200 400 600 800 1000 propagation delay (ps) input swing (mv) propagation delay vs. input swin g 231.5 232 232.5 233 233.5 234 234.5 235 235.5 -60 -40 -20 0 20 40 60 80 100 propagation delay (ps) temperature ( c) propagation delay vs. temperature v in = 800mv 4ghz output time (30ps/div.) output swing (200mv/div.) v cc = 2.5v, gnd = 0, v in = 100mv, t a = 25 c, unless otherwise stated. ? ? ? ? ? ? ? ? ? ?
6 precision edge ? sy58032u micrel, inc. m9999-020707 hbwhelp@micrel.com or (408) 955-1690 input interface applications l vpecl in /in v t sy58032u v cc v cc 0.01 f r pd gnd v cc v ref-ac for 2.5v, r pd = 19 ? for 3.3v, r pd = 50 ? figure 3c. lvpecl input interface l vpecl in /in v t sy58032u v cc r pd r pd for 3.3v, r pd = 100 ? for 2.5v, r pd = 50 ? gnd gnd v cc v cc v ref-ac figure 3d. ac-coupled lvpecl input interface cml in /in v t nc sy58032u v cc gnd v cc nc v ref-ac figure 3a. dc-coupled cml input interface option: may connect v t to v cc . cml in /in v t sy58032u v cc gnd v cc 0.01 f v cc v ref-ac figure 3b. ac-coupled cml input interface l vds in /in v t nc sy58032u v cc gnd v cc nc v ref-ac figure 3e. lvds input interface 50 ? 50 ? v cc gnd /in v t in figure 2. simplified differential input buffer input buffer
7 precision edge ? sy58032u micrel, inc. m9999-020707 hbwhelp@micrel.com or (408) 955-1690 part number function data sheet link sy58031u ultra-precision 1:8 fanout buffer with 400mv cml http://www.micrel.com/product-info/products/sy58031u.shtml outputs and internal i/o termination sy58032u ultra-precision 1:8 fanout buffer with lvpecl http://www.micrel.com/product-info/products/sy58032u.shtml outputs and internal termination sy58033u ultra-precision 1:8 fanout buffer with 400mv lvpecl http://www.micrel.com/product-info/products/sy58033u.shtml outputs and internal termination 32-mlf ? manufacturing guidelines exposed pad www.amkor. com/products/notes_papers/mlf_appnote_0902.pdf application note hbw solutions http://www.micrel.com/product-info/as/solutions.shtml related micrel products and support documentation r2 82 ? r2 82 ? for +2.5v systems, r1 = 250 ? , r2 = 62.5 ? z o = 50 ? z o = 50 ? +3.3v +3.3v v t = v cc C2v r1 130 ? r1 130 ? +3.3v figure 4. parallel termination-thevenin equivalent lvpecl output lvpecl has high input impedance, and very low output impedance (open emitter), and small signal swing which results in low emi. lvpecl is ideal for driving 50 ? and 100 ? controlled impedance transmission lines. there are several techniques for terminating the lvpecl output: parallel termination-thevenin equivalent, parallel termination (3-resistor), and ac-coupled termination. unused output pairs may be left floating. however, single- ended outputs must be terminated, or balanced. z = 50 ? z = 50 ? 50 ? 50 ? +3.3v +3.3v source destination r b v cc c1 (optional) 0.01 f notes: 1. power-saving alternative to thevenin termination. 2. place termination resistors as close to destination inputs as possible. 3. r b resistor sets the dc bias voltage, equal to v t . 4. for 2.5v systems, r b = 19 ? , for 3.3v systems, r b = 50 ? figure 5. parallel termination (3-resistor)
8 precision edge ? sy58032u micrel, inc. m9999-020707 hbwhelp@micrel.com or (408) 955-1690 32-pin micro leadframe ? (mlf-32) pa c kage ep- exposed pad die compside island heat dissipation heavy copper plane heavy copper plane v ee v ee heat dissipation pcb thermal consideration for 32-pin mlf ? package (always solder, or equivalent, the exposed pad to the pcb) package notes: 1. package meets level 2 qualification. 2. all parts are dry-packaged before shipment. 3. exposed pads must be soldered to a ground for proper thermal management. micrel, inc. 2180 fortune drive san jose, ca 95131 usa tel + 1 (408) 944-0800 fax + 1 (408) 474-1000 web http://www.micrel.com the information furnished by micrel in this data sheet is believed to be accurate and reliable. however, no responsibility is a ssumed by micrel for its use. micrel reserves the right to change circuitry and specifications at any time without notification to the customer. micrel products are not designed or authorized for use as components in life support appliances, devices or systems where malfu nction of a product can reasonably be expected to result in personal injury. life support devices or systems are devices or systems that (a) are intend ed for surgical implant into the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a significant inj ury to the user. a purchasers use or sale of micrel products for use in life support appliances, devices or systems is at purchasers own risk and purchaser agrees to fully indemnify micrel for any damages resulting from such use or sale. ? 2005 micrel, incorporated.
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