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for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maximintegrated.com. max13051 80v fault-protected can transceiver with autobaud general description the max13051 ?0v fault-protected can transceiverwith autobaud is ideal for device net and other industri- al network applications where overvoltage protection is required. the max13051 provides a link between the can protocol controller and the physical wires of the bus lines in a control area network (can). the max13051 features three different modes of opera- tion: high speed, slope control, and standby. high- speed mode allows data rates up to 1mbps. the slope-control mode can be used to program the slew rate of the transmitter for data rates of up to 500kbps, reducing the effects of emi and allowing the use of unshielded-twisted or parallel cable. in standby mode, the transmitter shuts off and a low-power receiver moni- tors the bus, waiting for a wake-up signal. the max13051 provides a transmitter data (txd) domi- nant timeout function that prevents erroneous can con- trollers from clamping the bus to a dominant level if the txd input is held low for greater than 1ms. the max13051 also provides an autobaud feature allowing the microcontroller to compute the incoming baud rate without destroying can protocol communication. the max13051 input common-mode range is greater than ?2v, exceeding the iso 11898 specification of -2v to +7v, and features ?kv human body model protection, making these devices ideal for harsh environments. the max13051 is available in an 8-pin so package and is specified from the -40? to +85? and -40? to +125? temperature ranges. applications industrial networksdevice net nodes telecom hvac features ? fully compatible with the iso 11898 standard ? autobaud mode ? short-circuit protection ? high-speed operation up to 1mbps ? slope-control mode ? low-current standby mode ? thermal shutdown ? transmit data dominant timeout ? ?kv human body model esd protection ? greater than ?2v common-mode range 19-3500; rev 1; 10/12 canl autobaud rxd 1 + 2 8 7 rs canh gnd v cc txd so top view 3 4 6 5 max13051 pin configuration max13051 120 ? 120 ? can controller v cc 0.1 f gnd gnd tx0 rx0 i/oi/o canl canh rs autobaud rxd txd v cc 16k ? to 200k ? typical operating circuit ordering information part temp range pin-package max13051esa+ -40? to +85? 8 so MAX13051ASA+ -40? to +125? 8 so + denotes a lead(pb)-free/rohs-compliant package. downloaded from: http:///
max13051 80v fault-protected can transceiver with autobaud 2 maxim integrated absolute maximum ratings 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. (all voltages referenced to gnd.)v cc ....................................................................................... -0.3v to +6v rs ...............................................................-0.3v to (v cc + 0.3v) txd, rxd, autobaud............................................-0.3v to +6v canh, canl .......................................................................?0v continuous power dissipation (t a = +70?) 8-pin so (derate 5.9mw/? above +70?) .................470mw operating temperature range .........................-40? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) ................................+300? soldering temperature (reflow) ......................................+260? dc electrical characteristics(v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, t a = +25?.) (note 1) parameter symbol conditions min typ max units dominant, r l = 60 ? 72 supply current i cc recessive 15 ma standby current i standby 25 ? thermal-shutdown threshold v tsh +165 ? thermal-shutdown hysteresis 13 ? input levels (txd, autobaud) high-level input voltage v ih 2v low-level input voltage v il 0.8 v v txd = v cc -5 +5 high-level input current i ih v autobaud = v cc +5 +15 ? v txd = gnd -300 -100 low-level input current i il v autobaud = gnd -5 +5 ? input capacitance c in 10 pf canh, canl transmitter normal mode, v txd = v cc , no load 2 3 v recessive bus voltage v canh , v canl standby mode, no load -100 +100 mv -76v < v canh , v canl < +76v ? recessive output current i canh , i canl -32v < v canh , v canl < +32v -2.5 +2.5 ma canh output voltage v canh v txd = 0v, dominant 3.0 4.5 v canl output voltage v canl v txd = 0v, dominant 0.50 1.75 v matching between canh and canloutput voltage ? dom v txd = 0v, dominant, t a = +25? (v canh + v canl ) -v cc -100 +150 mv dominant, v txd = 0v, 45 ? < r l < 60 ? 1.5 3.0 v differential output(v canh - v canl ) v diff recessive, v txd = v cc , no load -50 +50 mv canh short-circuit current i canhsc v canh = 0v, v txd = 0v -100 -70 -45 ma v canl = 5v, v txd = 0v 40 60 90 v canl = 40v, v txd = 0v 40 60 90 canl short-circuit current i canlsc v canl = 76v, v txd = 0v 63 ma downloaded from: http:///
3 maxim integrated max13051 80v fault-protected can transceiver with autobaud dc electrical characteristics (continued)(v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, t a = +25?.) (note 1) parameter symbol conditions min typ max units rxd output levels rxd high output voltage level v oh i = -100? 0.8 x v cc v cc v rxd low output voltage level v ol i = 5ma 0.4 v dc bus receiver (v txd = v cc , canh and canl externally driven) -12v < v cm < +12v 0.5 0.7 0.9 differential input voltage v diff -12v < v cm < +12v, standby mode 0.5 1.1 v differential input hysteresis v diff ( hyst ) normal mode, -12v < v cm < +12v 70 mv common-mode input resistance r icm normal or standby mode,v canh = v canl = ?2v 15 35 k ? matching between canh and canlcommon-mode input resistance r ic_match -3 +3 % differential input resistance r diff normal or standby mode,v canh - v canl = 1v 25 75 k ? common-mode input capacitance v txd = v cc 20 pf differential input capacitance v txd = v cc 10 pf input leakage current i li v cc = 0v, v canh = v canl = 5v -5 +5 ? slope control (rs ) input voltage for high-speed mode v il_rs 0.3 x v cc v input voltage for standby v ih_rs 0.75 x v cc v slope-control mode voltage v slope -200? < i rs < 10? 0.4 x v cc 0.6 x v cc v high-speed mode current i il_rs v rs = 0v -500 ? timing characteristics(v cc = +5v ?%, r l = 60 ? , c l = 100pf, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) parameter symbol conditions min typ max units delay txd to bus active t ontxd v rs = 0v (figure 1) 66 110 ns delay txd to bus inactive t offtxd v rs = 0v (figure 1) 61 95 ns delay bus to receiver active t onrxd v rs = 0v (figure 1) 54 115 ns delay bus to receiver inactive t offrxd v rs = 0v (figure 1) 46 160 ns delay txd to rxd active t onloop v rs = 0v (figure 1) 121 255 ns delay txd to rxd inactive t offloop v rs = 0v (figure 1) 108 255 ns r rs = 24k ? (500kbps) 280 450 ns r rs = 100k ? (125kbps) 0.82 1.6 delay txd to rxd active (dominantloop delay) slew-rate controlled t onloop_s r rs = 180k ? (62.5kbps) 1.37 5 ? r rs = 24k ? (500kbps) 386 600 ns r rs = 100k ? (125kbps) 0.74 1.6 delay txd to rxd inactive (loopdelay) slew-rate controlled t offloop_s r rs = 180k ? (62.5kbps) 0.97 5 ? downloaded from: http:///
max13051 80v fault-protected can transceiver with autobaud 4 maxim integrated note 1: all currents into device are positive and all currents out of the device are negative. all voltages are referenced to deviceground unless otherwise noted. timing characteristics (continued)(v cc = +5v ?%, r l = 60 ? , c l = 100pf, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) parameter symbol conditions min typ max units r rs = 24k ? (500kbps) 10 r rs = 100k ? (125kbps) 2.7 differential-output slew rate | sr | r rs = 180k ? (62.5kbps) 1.6 v/? dominant time for wake-up throughbus (figure 2) t wake standby mode, v diff = 3v 0.75 1.5 3.00 ? txd dominant timeout t dom v txd = 0v 0.3 0.6 1.0 ms esd protection human body model (canh, canl) 6 kv 0.9v 0.3 x v cc 0.7 x v cc 0.5v t ontxd t onrxd t onloop t offtxd t offrxd t offloop recessive dominant txd v diff rxd figure 1. timing diagram timing diagrams downloaded from: http:///
5 maxim integrated max13051 80v fault-protected can transceiver with autobaud t wake 0.9v v diff rxd standby mode dominant figure 2. timing diagram for standby and wake-up signal timing diagrams (continued) typical operating characteristics (v cc = +5v, r l = 60 ? , c l = 100pf, t a = +25?, unless otherwise specified.) slew rate vs. r rs at 100kbps max13051 toc01 r rs (k ? ) slew rate (v/ s) 180 160 140 120 100 80 60 40 20 5 10 15 20 25 30 0 0 200 recessive dominant supply current vs. data rate max13051 toc02 data rate (kbps) supply current (ma) 900 800 700 600 500 400 300 200 100 20 25 30 35 4015 0 1000 t a = +25 c t a = -40 c t a = +125 c standby supply current vs. temperature (rs = v cc ) max13051 toc03 temperature ( c) standby supply current ( a) 60 35 10 -15 11 12 13 14 15 16 17 18 19 2010 -40 85 downloaded from: http:///
typical operating characteristics (continued) (v cc = +5v, r l = 60 ? , c l = 100pf, t a = +25?, unless otherwise specified.) receiver propagation delay vs. temperature max13051 toc04 temperature ( c) receiver propagation delay (ns) 100 75 25 50 0 -25 10 20 30 40 50 60 70 80 90 100 0 -50 125 recessive r rs = gnd, data rate = 100kbps dominant driver propagation delay vs. temperature max13051 toc05 temperature ( c) driver propagation delay (ns) 60 35 10 -15 20 40 60 80 100 120 140 160 180 200 0 -40 85 recessive dominant r rs = gnd, data rate = 100kbps receiver output low vs. output current max13051 toc06 output current (ma) voltage rxd (v) 20 15 10 5 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 0 t a = -40 c t a = +125 c t a = +25 c receiver output high vs. output current max13051 toc07 output current (ma) receiver output high (v cc - rxd) (v) 7 6 4 5 2 3 1 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 08 t a = -40 c t a = +125 c t a = +25 c differential voltage vs. differential load max13051 toc08 differential load r l ( ? ) differential voltage (v) 260 220 180 140 100 60 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 20 300 t a = +125 c t a = -40 c t a = +25 c receiver propagation delay max13051 toc09 200ns v diff (1v/div) rxd(2v/div) driver propagation delay, (with r rs = 24k ? , 75k ? and 100k ? ) max13051 toc10 1.00 s txd(5v/div) v diff (2v/div)r rs = 24k ? v diff (2v/div)r rs = 75k ? v diff (2v/div)r rs = 100k ? 6 maxim integrated max13051 80v fault-protected can transceiver with autobaud downloaded from: http:///
7 maxim integrated max13051 80v fault-protected can transceiver with autobaud typical operating characteristics (continued) (v cc = +5v, r l = 60 ? , c l = 100pf, t a = +25?, unless otherwise specified.) driver propagation delay, (r rs = gnd) max13051 toc11 200ns/div txd(2v/div) v diff (1v/div) loopback propagation delay vs. r rs max13051 toc12 r rs (k ? ) loopback propagation delay ( s) 180 160 140 120 100 80 60 40 20 0.2 0.4 0.6 0.8 1.0 1.2 1.4 0 0 200 recessive dominant pin name function 1 txd transmit data input. txd is a cmos/ttl-compatible input from a can controller. 2 gnd ground 3v cc supply voltage. bypass v cc to gnd with a 0.1? capacitor. 4 rxd receive data output. rxd is a cmos/ttl-compatible output from the physical bus lines canh and canl. 5 autobaud autobaud input. drive autobaud low for normal operation. drive autobaud high for autobaudoperation. when operating in autobaud mode, txd is looped back to rxd without applying a differential signal at canh and canl. 6 canl can bus line low 7 canh can bus line high 8r s mode-select input. drive rs low or connect to gnd for high-speed operation. connect a resistor betweenrs and gnd to control output slope. drive rs high to put into standby mode. pin description downloaded from: http:///
max13051 80v fault-protected can transceiver with autobaud 8 maxim integrated detail description 80v fault tolerant the max13051 features ?0v fault protection. thisextended voltage range of canh and canl allows communication in high-voltage systems up to 80v. operating modes high-speed mode the max13051 can achieve transmission rates of up to1mbps when operating in high-speed mode. to oper- ate in high-speed mode, short rs to ground. slope-control mode connect a resistor from rs to ground to select slope-control mode (table 1). in slope-control mode, canh and canl slew rates are controlled by the resistor, (16k ? r rs 200k ? ), connected between rs and gnd. controlling the rise and fall slopes reduces high-frequency emi and allows the use of an unshielded- twisted pair or a parallel pair of wires as bus lines. the slew rate can be approximated using the formula below: where, sr is the desired slew rate and r rs is in k ? . standby mode in standby mode (rs = high), the transmitter isswitched off and the receiver is switched to a low-cur- rent/low-speed state. the supply current reduces to 15? to detect and recognize a wake-up event on the bus line. during standby mode, the bus line is moni- tored with a low-differential comparator. once the com- parator detects a dominant bus level greater than t wake , rxd pulls low. autobaud mode the max13051 logic-controlled autobaud input allowsa microcontroller to compute the incoming baud rate without destroying can protocol communication. when operating in autobaud mode, txd is looped back to rxd without applying a differential signal at canh and canl. see figure 4. sr v s r rs / () 250 driver thermal shutdown timeout and slope- control mode wake-up mode control wake-up filter mux autobaud circuitry v cc max13051 v cc canhcanl rs txd rxd autobaud enable gnd figure 3. max13051 functional diagram downloaded from: http:///
9 maxim integrated max13051 80v fault-protected can transceiver with autobaud transmitter the transmitter converts a single-ended input (txd)from the can controller to differential outputs for the bus lines (canh, canl). the truth table for the trans- mitter and receiver is given in table 2. txd dominant timeout the max13051 provides a transmitter-dominant timeoutthat prevents erroneous can controllers from clamping the bus to a dominant level by maintaining a continuous low txd signal. when the txd remains in the dominant state for greater than 1ms (max), the transmitter becomes disabled, driving the bus line to a recessive state (figure 5). after a dominant timeout fault, the max13051? transmitter becomes enabled upondetecting a rising edge at txd. receiver the receiver reads differential inputs from the bus lines(canh, canl) and transfers this data as a single- ended output (rxd) to the can controller. it consists of a comparator that senses the difference, v diff = (canh - canl), with respect to an internal threshold of0.7v. if this difference is positive, (v diff > 0.9v), a logic-low is present at rxd. if negative, (v diff < 0.5v), a logic-high is present. the receiver always echoes thecan bus data when not operating in autobaud mode. table 1. mode selection truth table condition forced at pin rs mode resulting current at rs v rs 0.3v x v cc high speed 200? | i rs | 500? 0.4v x v cc < v rs 0.6v x v cc slope control 10? | i rs | 200? v rs 0.75v x v cc standby | i rs | 10? txd rxd canh - canl txd rxd autobaud transmitterinput receiver output figure 4. max13051 autobaud timing diagram table 2. transmitter and receiver truth table when not connected to the bus txd rs canh canl bus state rxd low v rs 0.75v x v cc high low dominant low high or float v rs 0.75v x v cc v cc / 2 v cc / 2 recessive high xv rs 0.75v x v cc r icm gnd r icm gnd recessive high * common-mode input resistance. downloaded from: http:///
max13051 80v fault-protected can transceiver with autobaud 10 maxim integrated the canh and canl common-mode range is ?2v exceeding the iso 11898 specification at -2v to +7v. rxd is logic-high when canh and canl are shorted or undriven. driver output protection the max13051 current-limiting feature protects thetransmitter output stage against a short circuit to a posi- tive and negative battery voltage. although the power dissipation increases during this fault condition, current- limit protection prevents destruction of the transmitter output stage. upon removal of a short, the max13051 resumes normal operation. thermal shutdown if the junction temperature exceeds +165?, the deviceis switched off. the hysteresis is approximately 13?, disabling thermal shutdown once the temperature drops below 152?. in thermal shutdown, canh and canl go recessive. after a thermal-shutdown event, the max13051 resumes normal operation when the junction temperature drops below the thermal-shut-down hysteresis, and upon the max13051 detecting a rising edge at txd. applications information reduced emi and reflections in slope-control mode, the canh and canl outputsare slew-rate limited, minimizing high-frequency emi, and reducing reflections caused by improperly termi- nated cables. in multidrop can applications, it is important to main- tain a direct point-to-point wiring scheme. a single pair of wires should connect each element of the can bus, and the two ends of the bus should be terminated with 120 ? resistors, see figure 6. a star configuration should never be used.any deviation from the point-to-point wiring scheme creates a stub. the high-speed edge of the can data on a stub can create reflections back down the bus. these reflections can cause data errors by eroding the noise margin of the system. although stubs are unavoidable in a multidrop system, care should be taken to keep these stubs as small as possible, especially in high-speed mode. in slope-con- trol mode, the requirements are not as rigorous, but stub length should still be minimized. layout consideration canh and canl are differential signals and stepsshould be taken to insure equivalent parasitic capaci- tance. place the resistor at rs as close as possible to the max13051 to minimize any possible noise coupling at the input. transmitterdisabled transmitterenabled t dom txd v canh - v canl figure 5. transmitter-dominant timeout timing diagram max13051 rxd r l = 120 ? r l = 120 ? transceiver 2 transceiver 1 transceiver 3 canh canl txd stub length keep as short as possible twisted pair figure 6. multiple receivers connected to can bus downloaded from: http:///
11 maxim integrated max13051 80v fault-protected can transceiver with autobaud power supply and bypassing the max13051 requires no special layout considera-tions beyond common practices. bypass v cc to gnd with a 0.1? ceramic capacitor mounted closely to theic with short lead lengths and wide trace widths. 6kv esd protection esd protection structures are incorporated on all inputsto protect against esd encountered during handling and assembly. canh and canl inputs have extra protection to protect against static electricity found in normal opera- tion. maxim? engineers have developed state-of-the-art structures to protect these pins (canh, canl) against ?kv esd without damage. esd protection can be test- ed in several ways. the canh and canl inputs are characterized for protection to ?kv using the human body model. esd test conditions esd performance depends on a number of conditions.contact maxim for a reliability report that documents test setup, methodology, and results. human body model figure 7 shows the human body model, and figure 8shows the current waveform it generates when dis- charged into a low impedance. this model consists of a 100pf capacitor charged to the esd voltage of inter- est, which is then discharged into the device through a 1.5k ? resistor. chip information process: bicmos charge-current- limit resistor discharge resistance storagecapacitor c s 100pf r c 1m ? r d 1.5k ? high- voltage dc source device under test figure 7. human body esd test model i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing(not drawn to scale) i r 10% 0 0 amperes figure 8. human body model current waveform package information for the latest package outline information and land patterns (foot-prints), go to www.maximintegrated.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only.package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. package type package code outline no. land pattern no. 8 so s8m+5 21-0041 90-0096 downloaded from: http:///
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. 12 ________________________________ maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 2012 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max13051 80v fault-protected can transceiver with autobaud revision history revision number revision date description pages changed 0 11/04 initial release 1 10/12 added lead-free package information to the data sheet 1 downloaded from: http:///

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