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general description the max3051 interfaces between the can protocol controller and the physical wires of the bus lines in a controller area network (can). the max3051 provides differential transmit capability to the bus and differential receive capability to the can controller. the max3051 is primarily intended for +3.3v single-supply applica- tions that do not require the stringent fault protection specified by the automotive industry (iso 11898). the max3051 features four different modes of opera- tion: high-speed, slope-control, standby, and shutdown mode. 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. this reduces the effects of emi, thus allowing the use of unshielded twisted or parallel cable. in standby mode, the transmitter is shut off and the receiver is pulled high, placing the max3051 in low- current mode. in shutdown mode, the transmitter and receiver are switched off. the max3051 input common-mode range is from -7v to +12v, exceeding the iso 11898 specification of -2v to +7v. these features, and the programmable slew-rate limiting, make the part ideal for nonautomotive, harsh environments. the max3051 is available in 8-pin so and sot23 packages and operates over the -40? to +85? extended temperature range. applications printers jetlink industrial control and networks telecom backplane consumer applications features ? low +3.3v single-supply operation ? esd protection 12kv human body model ? wide -7v to +12v common-mode range ? small sot23 package ? four operating modes high-speed operation up to 1mbps slope-control mode to reduce emi (up to 500kbps) standby mode low-current shutdown mode ? thermal shutdown ? current limiting max3051 +3.3v, 1mbps, low-supply-current can transceiver ________________________________________________________________ maxim integrated products 1 canl shdn rxd 1 2 8 7 rs canh gnd v cc txd so/sot23 top view 3 4 6 5 max3051 pin configuration ordering information 19-3274; rev 1; 6/05 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. typical operating circuit at end of data sheet. part temp range pin- package top mark MAX3051ESA -40 c to +85 c 8 so max3051eka-t -40 c to +85 c 8 sot23-8 aekf
max3051 +3.3v, 1mbps, low-supply-current can transceiver 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v cc = +3.3v ?%, r l = 60 ? , c l = 100pf, t a = t min to t max , unless otherwise noted. typical values are at v cc = +3.3v and t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. v cc to gnd ..............................................................-0.3v to +6v txd, rs, shdn to gnd ...........................................-0.3v to +6v rxd to gnd .............................................................-0.3v to +6v canh, canl to gnd..........................................-7.5v to +12.5v continuous power dissipation (t a = +70?) 8-pin so (derate 5.9mw/? above +70?)...................470mw 8-pin sot23 (derate 9.7mw/? above +70?).............774mw operating temperature range ...........................-40? to +85? maximum junction temperature .....................................+150? storage temperature range .............................-65? to +150? lead temperature range (soldering, 10s)......................+300? parameter symbol conditions min typ max units dominant 35 70 recessive 2 5 ma supply current i s standby 8 15 a shutdown current i shdn v shdn = v cc , txd = v cc or floating 1 a thermal-shutdown threshold v tsh +160 c thermal-shutdown hysteresis 25 c txd input levels high-level input voltage v ih 2 v cc + 0.3v v low-level input voltage v il 0.8 v input capacitance c in 5pf pullup resistor r intxd 50 100 k ? canh, canl transmitter v txd = v cc , no load 2 2.3 3 v recessive bus voltage v canh , v canl v txd = v cc , no load, v rs = v cc (standby mode) -100 +100 mv off-state output leakage -2v < v canh , v canl < +7v, shdn = high -250 +250 ? input leakage current v cc = 0v, v canh = v canl = 5v -250 +250 ? canh output voltage v canh v txd = 0v 2.45 v canl output voltage v canl v txd = 0v 1.25 v v txd = 0v 1.5 3.0 v txd = 0v, r l = 45 ? 1.2 3.0 v v txd = v cc , no load -500 +50 differential output (v canh - v canl ) v txd = v cc, r l = 60 ? -120 +12 mv
max3051 +3.3v, 1mbps, low-supply-current can transceiver _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc = +3.3v ?%, r l = 60 ? , c l = 100pf, t a = t min to t max , unless otherwise noted. typical values are at v cc = +3.3v and t a = +25?.) (note 1) parameter symbol conditions min typ max units -7v v canh 0v -200 canh short-circuit current i canhsc minimum foldback current -35 ma canl short-circuit current i canlsc v cc v canl 12v 200 ma rxd output levels rxd high output-voltage level v oh i = -1ma 0.8 x v cc v cc v rxd low output-voltage level v ol i = 4ma 0.4 v d c bu s r ec ei ver ( v t xd = v c c ; c a n h a n d c a n l e x t e r n a l l y dr iv e n ; - 7 v v c a n h , v c a n l + 1 2 v, un le s s ot h e r w i s e sp e c if i e d ) -7v v cm +12v 0.5 differential input voltage (recessive) v diff v rs = v cc (standby mode) 0.5 v dominant 0.9 differential input voltage (dominant) v diff v rs = v cc (standby mode) 1.1 v differential input hysteresis v d if f ( h y s t ) 20 mv canh and canl input resistance r i 20 50 k ? differential input resistance r diff 40 100 k ? mode selection (rs) input voltage for high speed v slp 0.3 x v cc v input voltage for standby v stby 0.75 x v cc v slope-control mode voltage v slope r rs = 25k ? to 200k ? 0.4 x v cc 0.6 x v cc v high-speed mode current i hs v rs = 0 -500 ? shutdown (shdn) shdn input voltage high v shdnh 2v shdn input voltage low v shdnl 0.8 v shdn pulldown resistor r inshdn 50 100 k ?
max3051 +3.3v, 1mbps, low-supply-current can transceiver 4 _______________________________________________________________________________________ note 1: all currents into device are positive; all currents out of the device are negative. all voltages are referenced to device ground, unless otherwise noted. note 2: no other devices on the bus. note 3: bus externally driven. timing characteristics (v cc = +3.3v ?%, r l = 60 ? , c l = 100pf, t a = t min to t max , unless otherwise noted. typical values are at v cc = +3.3v and t a = +25?.) parameter symbol conditions min typ max units v rs = 0v ( 1mbps) 50 r rs = 25k ? ( 500kbps) 183 delay txd to bus active (figure 1) t ontxd r rs = 100k ? ( 125kbps) 770 ns v rs = 0v ( 1mbps) 70 r rs = 25k ? ( 500kbps) 226 delay txd to bus inactive (figure 1) t offtxd r rs = 100k ? ( 125kbps) 834 ns v rs = 0v ( 1mbps) 80 r rs = 25k ? ( 500kbps) 200 delay bus to receiver active (figure 1) t onrxd r rs = 100k ? ( 125kbps) 730 ns v rs = 0v ( 1mbps) 100 r rs = 25k ? ( 500kbps) 245 delay bus to receiver inactive (figure 1) t offrxd r rs = 100k ? ( 125kbps) 800 ns v rs = 0v ( 1mbps) 96 r rs = 25k ? ( 500kbps) 12.5 r rs = 100k ? ( 125kbps) 2.9 differential-output slew rate sr r rs = 200k ? ( 62.5kbps) 1.6 v/? bus dominant to rxd active t drxdl v rs > 0.8 x v cc , standby, figure 2 1 ? standby to receiver active t sbrxdl bus dominant, figure 2 4 ? shdn to bus inactive t offshdn txd = gnd, figure 3 (note 2) 1 s s h dn to recei ver acti ve t onshdn bus dominant, fi gur e 3 (note 3) 4 s s h d n to s tand b yt shdnsb fi g ur e 4 20 s esd protection human body model ?2 kv
max3051 +3.3v, 1mbps, low-supply-current can transceiver _______________________________________________________________________________________ 5 txd v diff 0.9v rxd 0.5v v cc /2 v cc /2 t ontxd t onrxd t offtxd t offrxd v cc /2 v cc /2 rs v diff t sbrxdl t drxdl 1.1v rxd bus externally driven v cc x 0.75 v cc /2 v cc /2 shdn v diff t offshdn t onshdn rxd bus externally driven v cc /2 v cc /2 v cc /2 0.5v figure 1. timing diagram figure 2. timing diagram for standby signal figure 3. timing diagram for shutdown signal 0.75v v cc rs shdn v cc /2 t shdnsb figure 4. timing diagram for shutdown-to-standby signal timing diagrams
slew rate vs. r rs at 100kbps max3051toc01 r rs (k ? ) slew rate (v/ s) 180 160 140 120 100 80 60 40 20 5 10 15 20 25 30 35 0 0200 max3051 +3.3v, 1mbps, low-supply-current can transceiver 6 _______________________________________________________________________________________ supply current vs. data rate max3051toc02 data rate (kbps) supply current (ma) 800 600 400 200 13 16 19 22 25 10 0 1000 t a = +25 c t a = -40 c t a = +85 c shutdown supply current vs. temperature (shdn = v cc ) max3051toc03 temperature ( c) shutdown supply current (na) 60 35 10 -15 20 40 60 80 100 120 0 -40 85 standby supply current vs. temperature (rs = v cc ) max3051toc04 temperature ( c) standby supply current ( a) 60 35 10 -15 8.5 9.0 9.5 10.0 10.5 11.0 8.0 -40 85 receiver propagation delay vs. temperature max3051toc05 temperature ( c) receiver propagation delay (ns) 60 35 10 -15 5 10 15 20 25 30 35 40 45 50 0 -40 85 r rs = gnd recessive dominant driver propagation delay vs. temperature max3051toc06 temperature ( c) driver propagation delay (ns) 60 35 10 -15 10 20 30 40 50 0 -40 85 r rs = gnd, data rate = 100kbps recessive dominant receiver output low vs. output current max3051toc07 output current (ma) voltage rxd (v) 40 35 5 10 15 25 20 30 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 0 045 t a = -85 c t a = +25 c t a = -40 c typical operating characteristics (v cc = +3.3v, r l = 60 ? , c l = 100pf, t a = +25?, unless otherwise specified.)
max3051 +3.3v, 1mbps, low-supply-current can transceiver _______________________________________________________________________________________ 7 receiver propagation delay max3051toc10 rxd 1v/div cahn - canl 200ns/div rs = gnd driver propagation delay max3051toc11 txd 2v/div r rs = 24k ? r rs = 75k ? r rs = 100k ? 200ns/div driver propagation delay max3051toc12 txd 1v/div cahn - canl 200ns/div rs = gnd loopback propagation delay vs. r rs max3051toc13 r rs (k ? ) loopback propagation delay (ns) 180 160 140 120 100 80 60 40 20 200 400 600 800 1000 1200 0 0 200 typical operating characteristics (continued) (v cc = +3.3v, r l = 60 ? , c l = 100pf, t a = +25?, unless otherwise specified.) receiver output high vs. output current max3051toc08 output current (ma) receiver output high (v cc - rxd) (v) 7 1 2 3 5 4 6 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 0 08 differential voltage vs. differential load max3051toc09 differential load r l ( ? ) differential voltage (v) 200 100 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 0300 t a = -85 c t a = +25 c t a = -40 c
max3051 +3.3v, 1mbps, low-supply-current can transceiver 8 _______________________________________________________________________________________ detailed description pin name function 1 txd transmit data input. txd is a cmos/ttl-compatible input from a can controller. txd has an internal 75k ? pullup resistor. 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. 5 shdn shutdown input, cmos/ttl-compatible. drive shdn high to put the max3051 in shutdown. shdn has an internal 75k ? pulldown resistor to gnd. 6 canl can bus line low 7 canh can bus line high 8rs mode-select input. drive rs low or connect to gnd for high-speed operation. connect a resistor between rs and gnd to control output slope. drive rs high to put into standby mode (see the mode selection section). max3051 0.75v thermal shutdown transmitter control mode selection receiver v cc rs rxd gnd canl canh txd shutdown shdn v cc figure 5. max3051 functional diagram
max3051 +3.3v, 1mbps, low-supply-current can transceiver _______________________________________________________________________________________ 9 detailed description the max3051 interfaces between the can protocol controller and the physical wires of the bus lines in a can. it provides differential transmit capability to the bus and differential receive capability to the can con- troller. it is primarily intended for +3.3v single-supply applications that do not require the stringent fault pro- tection specified by the automotive industry (iso 11898) the max3051 features four different modes of opera- tion: high-speed, slope-control, standby, and shutdown mode. high-speed mode allows data rates up to 1mbps. the slope-control mode can be used to pro- gram the slew rate of the transmitter for data rates of up to 500kbps. this reduces the effects of emi, thus allow- ing the use of unshielded twisted or parallel cable. in standby mode, the transmitter is shut off and the receiver is pulled high, placing the max3051 in low- current mode. in shutdown mode, the transmitter and receiver are switched off. the max3051 input common-mode range is from -7v to +12v, exceeding the iso 11898 specification of -2v to +7v. these features, and the programmable slew-rate limiting, make the part ideal for nonautomotive, harsh environments. the transceivers operate from a single +3.3v supply and draw 35? of supply current in dominant state and 2? in recessive state. in standby mode, supply cur- rent is reduced to 8?. in shutdown mode, supply cur- rent is less than 1?. canh and canl are output short-circuit current limited and are protected against excessive power dissipation by thermal-shutdown circuitry that places the driver outputs into a high-impedance state. 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 1. 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 of +0.75v. if this v diff is greater than 0.75, a logic-low is present at rxd. if v diff is less than 0.75v, a logic-high is present. the receiver always echoes the can bus data. the canh and canl common-mode range is -7v to +12v. rxd is logic-high when canh and canl are shorted or terminated and undriven. mode selection high-speed mode connect rs to ground to set the max3051 to high- speed mode. when operating in high-speed mode, the max3051 can achieve transmission rates of up to 1mbps. in high-speed mode, use shielded twisted pair cable to avoid emi problems. slope-control mode connect a resistor from rs to ground to select slope- control mode (table 2). in slope-control mode, canh and canl slew rates are controlled by the resistor con- nected to the rs pin. maximum transmission speeds are controlled by r rs and range from 40kbps to 500kbps. controlling the rise and fall slopes reduces emi and allows the use of an unshielded twisted pair or a parallel pair of wires as bus lines. the equation for selecting the resistor value is given by: r rs (k ? ) 12000 / (maximum speed in kbps) see the slew rate vs. rrs graph in the typical operating characteristics . standby mode if a logic-high is applied to rs, the max3051 enters a low-current standby mode. in this mode, the transmitter txd rs shdn canh canl bus state rxd low v rs < 0.75 x v cc low high low dominant low high or float v rs < 0.75 x v cc low 5k ? to 25k ? to v cc / 2 5k ? to 25k ? to v cc / 2 recessive high x v rs > 0.75 x v cc low 5k ? to 25k ? to gnd 5k ? to 25k ? to gnd recessive high x x high floating floating floating high table 1. transmitter and receiver truth table when not connected to the bus
max3051 +3.3v, 1mbps, low-supply-current can transceiver 10 ______________________________________________________________________________________ is switched off and the receiver is switched to a low- current/low-speed state. if dominant bits are detected, rxd switches to low level. the microcontroller should react to this condition by switching the transceiver back to normal operation. when the max3051 enters standby mode, rxd goes high for 4? (max) regardless of the bus state. however, after 4?, rxd goes low only when the bus is dominant, otherwise rxd remains high (when the bus is recessive). for proper measurement of standby- to-receiver active time (t sbrxdl ), the bus should be in dominant state (see figure 2). shutdown drive shdn high to enter shutdown mode. connect shdn to ground or leave floating for normal operation. thermal shutdown if the junction temperature exceeds +160?, the device is switched off. the hysteresis is approximately 25?, disabling thermal shutdown once the temperature drops below 135?. in thermal shutdown, canh and canl go recessive and all ic functions are disabled. applications information reduced emi and reflections in slope-control mode, the canh and canl outputs are slew-rate limited, minimizing emi and reducing reflections caused by improperly terminated 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 (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. power supply and bypassing the max3051 requires no special layout considerations beyond common practices. bypass v cc to gnd with a 0.1? ceramic capacitor mounted close to the ic with short lead lengths and wide trace widths. condition forced at pin rs mode resulting current at rs v rs < 0.3 x v cc high speed |i rs | < 500? 0.4 x v cc 0.75 x v cc standby |i rs | < 10? table 2. mode selection truth table
max3051 +3.3v, 1mbps, low-supply-current can transceiver ______________________________________________________________________________________ 11 chip information transistor count: 1024 process: bicmos max3051 can controller txd v cc rxd rs gnd canh canl v cc tx0 rx0 gnd 0.1 f 120 ? 25k ? to 200k ? 120 ? typical operating circuit max3051 r l = 120 ? r l = 120 ? transceiver 3 transceiver 1 txd rxd canh canl twisted pair stub length keep as short as possible transceiver 2 figure 6. multiple receivers connected to can bus
max3051 +3.3v, 1mbps, low-supply-current can transceiver 12 ______________________________________________________________________________________ package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) soicn .eps package outline, .150" soic 1 1 21-0041 b rev. document control no. approval proprietary information title: top view front view max 0.010 0.069 0.019 0.157 0.010 inches 0.150 0.007 e c dim 0.014 0.004 b a1 min 0.053 a 0.19 3.80 4.00 0.25 millimeters 0.10 0.35 1.35 min 0.49 0.25 max 1.75 0.050 0.016 l 0.40 1.27 0.394 0.386 d d min dim d inches max 9.80 10.00 millimeters min max 16 ac 0.337 0.344 ab 8.75 8.55 14 0.189 0.197 aa 5.00 4.80 8 n ms012 n side view h 0.244 0.228 5.80 6.20 e 0.050 bsc 1.27 bsc c h e e b a1 a d 0 -8 l 1 variations:
max3051 +3.3v, 1mbps, low-supply-current can transceiver maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 13 2005 maxim integrated products printed usa is a registered trademark of maxim integrated products, inc. package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) sot23, 8l .eps rev. document control no. approval proprietary information title: 3.00 2.60 e c e1 e between 0.08mm and 0.15mm from lead tip. 8. meets jedec mo178. 8 0.60 1.75 0.30 l2 0 e1 e l 1.50 e1 0.65 bsc. 1.95 ref. 0.25 bsc. gauge plane seating plane c c l pin 1 i.d. dot (see note 6) l c l c a2 e1 d detail "a" 5. coplanarity 4 mils. max. note: 7. solder thickness measured at flat section of lead 6. pin 1 i.d. dot is 0.3 mm ? min. located above pin 1. 4. package outline inclusive of solder plating. 3. package outline exclusive of mold flash & metal burr. heel of the lead parallel to seating plane c. 2. foot length measured from lead tip to upper radius of 1. all dimensions are in millimeters. l2 l a1 a 0.45 1.30 0.15 1.45 max 0.28 b 0.90 a2 0.00 a1 0.90 a min symbol 3.00 0.20 2.80 d 0.09 c see detail "a" l c b e d 1 21-0078 1 package outline, sot-23, 8l body 0 0

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