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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 applications 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 -40c to +85c extended temperature range . applications printers jetlink industrial control and networks telecom backplane consumer applications beneits and features use 3v microcontroller with same ldo ? low +3.3v single-supply operation common mode range exceeds the iso11898 standard (-2v to +7v) ? wide -7v to +12v common-mode range uses minimal board space ? sot23 package flexible operation optimizes performance and power consumption for reduced thermal dissipation ? four operating modes ? high-speed operation up to 1mbps ? slope-control mode to reduce emi (up to 500kbps) ? standby mode ? low-current shutdown mode robust protection increases system reliability ? 12kv human body model esd protection ? thermal shutdown ? current limiting typical operating circuit at end of data sheet. +denotes lead(pb)-free/rohs-compliant package. t = tape and reel part temp range pin- package top mark max3051esa+ -40c to +85c 8 so max3051eka+t -40c to +85c 8 sot23-8 aekf canl shdn rxd 1 + 2 8 7 rs canh gnd v cc txd so/sot23 top view 3 4 6 5 max3051 max3051 +3.3v, 1mbps, low-supply-current can transceiver 19-3274; rev 3; 2/15 ordering informationpin coniguration downloaded from: http:///
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 = +70c) 8-pin so (derate 5.9mw/c above +70c) ................. 470mw 8-pin sot23 (derate 5.1mw/c above +70c) ....... 408.2mw operating temperature range ........................... -40c to +85c maximum junction temperature ..................................... +150c storage temperature range ............................ -65c to +150c lead temperature range (soldering, 10s) ...................... +300c soldering temperature (reflow) ....................................... +260c (v cc = +3.3v 5%, 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 = +25c.) (note 1) parameter symbol conditions min typ max units supply current i s dominant 35 70 ma recessive 2 5 standby 8 15 a shutdown current i shdn v shdn = v cc , txd = v cc or unconnected 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 5 pf pullup resistor r intxd 50 100 k? canh, canl transmitter recessive bus voltage v canh , v canl v txd = v cc , no load 2 2.3 3 v 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 a input leakage current v cc = 0v, v canh = v canl = 5v -250 +250 a canh output voltage v canh v txd = 0v 2.45 v canl output voltage v canl v txd = 0v 1.25 v differential output (v canh - v canl ) v txd = 0v 1.5 3.0 v v txd = 0v, r l = 45 1.2 3.0 v txd = v cc , no load -500 +50 mv v txd = v cc , r l = 60 -120 +12 max3051 +3.3v, 1mbps, low-supply-current can transceiver www.maximintegrated.com maxim integrated 2 absolute maximum ratings stresses beyond those listed under absolute 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. electrical characteristics downloaded from: http:///
(v cc = +3.3v 5%, 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 = +25c.) (note 1) parameter symbol conditions min typ max units canh short-circuit current i canhsc -7v v canh 0v -200 ma minimum foldback current -35 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 dc bus receiver (v txd = v cc ; canh and canl externally driven; -7v v canh , v canl +12v, unless otherwise speciied) differential input voltage (recessive) v diff -7v v cm +12v 0.5 v v rs = v cc (standby mode) 0.5 differential input voltage (dominant) v diff dominant 0.9 v v rs = v cc (standby mode) 1.1 differential input hysteresis v diff(hyst) 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 = 0v -500 a shutdown (shdn) shdn input voltage high v shdnh 2 v 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 www.maximintegrated.com maxim integrated 3 electrical characteristics (continued) downloaded from: http:///
(v cc = +3.3v 5%, 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 = +25c.) 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. parameter symbol conditions min typ max units delay txd to bus active (figure 1) t ontxd v rs = 0v ( 1mbps) 50 ns r rs = 25k ( 500kbps) 183 r rs = 100k ( 125kbps) 770 delay txd to bus inactive (figure 1) t offtxd v rs = 0v ( 1mbps) 70 ns r rs = 25k ( 500kbps) 226 r rs = 100k ( 125kbps) 834 delay bus to receiver active (figure 1) t onrxd v rs = 0v ( 1mbps) 80 ns r rs = 25k ( 500kbps) 200 r rs = 100k ( 125kbps) 730 delay bus to receiver inactive(figure 1) t offrxd v rs = 0v ( 1mbps) 100 ns r rs = 25k ( 500kbps) 245 r rs = 100k ( 125kbps) 800 differential-output slew rate sr v rs = 0v ( 1mbps) 96 v/s r rs = 25k ( 500kbps) 12.5 r rs s = 100k ( 125kbps) 2.9 r rs = 200k ( 62.5kbps) 1.6 bus dominant to rxd active t drxdl v rs > 0.8 x v cc , standby, figure 2 1 s standby to receiver active t sbrxdl bus dominant, figure 2 4 s shdn to bus inactive t offshdn txd = gnd, figure 3 (note 2) 1 s shdn to receiver active t onshdn bus dominant, fi gur e 3 (note 3) 4 s shdn to standby t shdnsb figure 4 20 s esd protection human body model 12 kv max3051 +3.3v, 1mbps, low-supply-current can transceiver www.maximintegrated.com maxim integrated 4 timing characteristics downloaded from: http:///
figure 1. timing diagram figure 2. timing diagram for standby signal figure 3. timing diagram for shutdown signal figure 4. timing diagram for shutdown-to-standby signal 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 figure 1 rs v diff t sbrxdl t drxdl 1.1v rxd bus externally driven v cc x 0.75 v cc /2 v cc /2 figure 2 shdn v diff t offshdn t onshdn rxd bus externally driven v cc /2 v cc /2 v cc /2 0.5v figure 3 0.75v x v cc rs shdn v cc /2 t shdnsb figure 4 max3051 +3.3v, 1mbps, low-supply-current can transceiver www.maximintegrated.com maxim integrated 5 timing diagrams downloaded from: http:///
(v cc = +3.3v, r l = 60, c l = 100pf, t a = +25c, unless otherwise speciied.) supply current vs. data rate max3051 toc02 data rate (kbps) supply current (ma) 800 600 400 200 13 16 19 22 2510 0 1000 t a = +25c t a = -40c t a = +85c shutdown supply current vs. temperature (shdn = v cc ) max3051 toc03 temperature (c) shutdown supply current (na) 60 35 10 -15 20 40 60 80 100 120 0 -40 85 driver propagation delay vs. temperature max3051 toc06 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 standby supply current vs. temperature (rs = v cc ) max3051 toc04 temperature (c) standby supply current ( m a) 60 35 10 -15 8.5 9.0 9.5 10.0 10.5 11.0 8.0 -40 85 receiver output low vs. output current max3051 toc07 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 0 45 t a = +25c t a = -40c t a = -85c receiver propagation delay vs. temperature max3051 toc05 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 slew rate vs. r rs at 100kbps max3051 toc01 r rs (k ? ) slew rate (v/ s) 180 160 140 120 100 80 60 40 20 5 10 15 20 25 30 35 0 0 200 max3051 +3.3v, 1mbps, low-supply-current can transceiver maxim integrated 6 www.maximintegrated.com typical operating characteristics downloaded from: http:///
(v cc = +3.3v, r l = 60, c l = 100pf, t a = +25c, unless otherwise speciied.) driver propagation delay max305 1toc12 txd1v/div cahn - canl 200ns/div rs = gnd receiver propagation delay max3051 toc10 rxd1v/div cahn - canl 200ns/div rs = gnd receiver output high vs. output current max3051 toc08 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 0 8 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 driver propagation delay max3051 toc11 txd2v/div r rs = 24k ? r rs = 75k ? r rs = 100k ? 200ns/div differential voltage vs. differential load max3051 toc09 differential load r l ( ? ) differential voltage (v) 200 100 0.5 1.0 1.5 2.0 2.5 3.0 3.5 0 0 300 t a = -85c t a = +25c t a = -40c max3051 +3.3v, 1mbps, low-supply-current can transceiver maxim integrated 7 www.maximintegrated.com typical operating characteristics (continued) downloaded from: http:///
figure 5. max3051 functional diagram pin name description 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 3 v cc supply voltage. bypass v cc to gnd with a 0.1f 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 8 rs 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 +3.3v, 1mbps, low-supply-current can transceiver www.maximintegrated.com maxim integrated 8 pin description downloaded from: http:///
detailed description the max3051 interfaces between the can protocol con - troller 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 controller. it is primarily intended for +3.3v single-supply applications 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 transceivers operate from a single +3.3v supply and draw 35a of supply current in dominant state and 2a in recessive state. in standby mode, supply current is reduced to 8a. in shutdown mode, supply current is less than 1a. 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 transmitter 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 rrs 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 table 1. transmitter and receiver truth table when not connected to the bus txd rs shdn canh canl bus state rxd low v rs < 0.75 x v cc low high low dominant low high or loat 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 unconnected unconnected unconnected high max3051 +3.3v, 1mbps, low-supply-current can transceiver www.maximintegrated.com maxim integrated 9 downloaded from: http:///
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 4s (max) regardless of the bus state. however, after 4s, 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 unconnected for normal operation.thermal shutdown if the junction temperature exceeds +160c, the device is switched off. the hysteresis is approximately 25c, disabling thermal shutdown once the temperature drops below 135c. in thermal shutdown, canh and canl go recessive and all ic functions are disabled. applications information reduced emi and relections 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 maintain 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 cre - ates 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-control 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 0.1f ceramic capacitor mounted close to the ic with short lead lengths and wide trace widths. table 2. mode selection truth table condition forced at pin rs shdn canl v rs < 0.3 x v cc high speed |i rs | < 500a 0.4 x v cc 0.75 x v cc standby |i rs | < 10a max3051 +3.3v, 1mbps, low-supply-current can transceiver www.maximintegrated.com maxim integrated 10 downloaded from: http:///
figure 6. multiple receivers connected to can bus package type package code outline no. land pattern no. 8 so s8+4 21-0041 90-0096 8 sot23 k8f+4 21-0078 90-0176 max3051 r l = 120 ? r l = 120 ? transceiver 3 transceiver 1 txdrxd canh canl twisted pair stub length keep as short as possible transceiver 2 figure 6 max3051 can controller txd v cc rxdrs gnd canh canl v cc tx0 rx0 gnd 0.1f 120 ? 25k ? to 200k ? 120 ? max3051 +3.3v, 1mbps, low-supply-current can transceiver www.maximintegrated.com maxim integrated 11 typical operating circuit chip information process: bicmos package information for the latest package outline information and land patterns (footprints), 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. downloaded from: http:///
revision number revision date description pages changed 2 10/12 added lead-free part information to the data sheet 1C13 3 2/15 updated front page content 1 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 speciications without n otice 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. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max3051 +3.3v, 1mbps, low-supply-current can transceiver ? 2015 maxim integrated products, inc. 12 revision history for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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