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general description the max3054/max3055/max3056 are interfaces between the protocol controller and the physical wires of the bus lines in a controller area network (can). the devices provide differential transmit capability and switch to single-mode if certain fault conditions occur. the max3054/max3055/max3056 guarantee full wakeup capability during failure modes. the extended fault-protected voltage range of canh and canl bus lines of 80v. current-limiting and thermalpro - tection circuits protect the transmitter output stage against overcurrent faults to prevent destruction of the transmitter output stage. the canh and canl lines are also protect - ed against electrical transients that may occur in rugged environments. the transceiver provides three low-power modes that can be entered and exited through pins stb and en. an output inh pin can be used for deactivation of an external voltage regulator. the max3054/max3055/max3056 are designed to provide optimal operation for a specified data rate. the max3054 is ideal for high data rates of 250kbps. the max3055 is used for data rates of 125kbps and the max3056 is designed for 40kbps applications. for 40kbps and 125kbps versions, a built-in slope-control feature allows the use of unshielded cables, and receiver input filters guarantee high noise immunity. applications industrial hvac features 80v fault protection low rfi/excellent emc immunity full wake-up capability during failure modes bus failure management support single-wire transmission mode with ground offset voltages up to 1.5v thermally protected do not disturb the bus line when unpowered low-current sleep and standby mode with wake-up through bus lines up to 250kbps data rate (max3054) pin and functionally compatible with tja1054 19-2687; rev 1; 9/14 +lead-free/rohs-compliant package part temp range data rate pin- package max3054 asd+ -40c to +125c 250kbps 14 so max3055 asd+ -40c to +125c slew control 125kbps 14 so max3056 asd+ -40c to +125c slew control 40kbps 14 so txd rxd stb en err inh battery rth canh canl rtl batt gnd v cc wake +5v can controller 2 3 5 6 4 1 8 11 12 9 7 10 13 14 100nf v batt +12v can bus fault to 80v max305_ 14 13 12 11 10 9 8 1 2 3 4 5 6 7 batt gnd canl canh err rxd txd inh top view v cc rtl rth wake en stb so max3054 max3055 max3056 typical operating circuit pin confguration ordering information max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver
(all voltages are referenced to gnd) supply voltage (v cc ) .............................................. -0.3v to +6v battery voltage (v batt ) ........................................ -0.3v to +80v txd, rxd, err , stb , en ....................... -0.3v to (v cc + 0.3v) canh, canl .......................................................... -80v to +80v rth, rtl .............................................................. .-0.3v to +80v rth, rtl current .......................................................... 180ma wake .................................................................... -0.3v to +80v inh ........................................................ -0.3v to (v batt + 0.3v) inh current ...................................................................... -0.5ma transient voltage (iso 7637) ................................ -200v, +200v continuous power dissipation (t a = +70c) 14-pin so (derate 8.3mw/c above +70c) ............... 667mw operating temperature range ......................... -40c to +125c junction temperature ...................................................... +150c storage temperature range ............................ -65c to +150c lead temperature (soldering, 10s) ................................. +300c (v cc = +5v 5%, v batt = +5v to +42v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, v batt = 14v, r1 = 100, t a = +25c.) (notes 1, 2) parameter symbol conditions min typ max units voltage supplies supply current i cc dominant normal operating mode, no load, txd = 0 16 30 ma recessive normal operating mode, txd = v cc 4 10 low-power modes: v txd = v cc , v batt = 14v 3 10 a battery current i batt low-power modes at v trl = v batt , v batt = v wake = v inh = 5v to 27v 5 54 125 a battery power on flag threshold v pwron low-power modes 1.0 3.5 v stb , en, and txd high-level input voltage v ih 2.4 v low-level input voltage v il 0.8 v high-level input current i ih v in = 4v stb and en 9 20 a txd -200 -80 -25 low-level input current i il v in = 1v stb and en 4 8 a txd -800 -320 -100 supply voltageforced standby mode (fail-safe) v fs v batt = 14v 2.75 4.50 v rxd and err high-level output voltage v oh i out = -1ma v cc - 0.5 v cc v low-level output voltage v ol i out = 7.5ma 0 0.9 v wake wake-up threshold voltage v th(wake ) v stb = 0v 2.0 2.7 3.4 v low-level input current i il(wake) v wake = 0v -10 -4 -1 a 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 ab solute maximum rating conditions for extended periods may affect device reliability. dc electrical characteristics max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
(v cc = +5v 5%, v batt = +5v to +42v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, v batt = 14v, r1 = 100, t a = +25c.) (notes 1, 2) parameter symbol conditions min typ max units inh high-level voltage drop v h inh = -0.18ma, standby mode 0.8 v leakage current i leak(inh) sleep mode, v inh = 0v 5 a canh, canl differential receiver threshold v diff v cc = 5v, no failures and bus failures 1, 2, 5, 9 -3.5 -3.2 -2.9 v v cc = 4.75v to 5.25v, no failures and bus failures 1, 2, 5, 9 -0.70 x v cc -0.58 x v cc differential receiver hysteresis hyst no failures and bus failures 1, 2, 5, 9 18 mv canh recessive output voltage v och txd = v cc , rth < 4k? 200 mv canl recessive output voltage v ocl txd = v cc , rth < 4k? v cc - 0.2 v canh dominant output voltage v ochdom txd = 0v, r1 = 100? v cc - 1.4 v canl dominant output voltage v ocldom txd = 0v, r1 = 100? 1.4 v canh output current i o(canh) v canh = 0v, txd = 0v -150 -86 ma low-power modes, v canh = 0v, v cc = 5v -10 a canl output current i o(canl) v canl = 14v, txd = 0v 75 130 ma low-power modes, v canl = 42v, v batt = 42v, rtl = open 20 a voltage detection threshold for short circuit to battery on canh v det(canh) v cc = 4.75v to 5.25v 0.30 x v cc 0.37 x v cc v low-power modes 1.1 2.5 voltage detection threshold for short circuit to gnd on canl v dtg(canl) low-power modes 2.5 3.9 v voltage detection threshold for short circuit to battery on canl v det(canl) normal mode, v cc = 5v 6.4 7.3 8.2 v canl wake-up threshold v thl(wake) low-power modes 2.5 3.2 3.9 v canh wake-up threshold v thh(wake) low-power modes 1.1 1.8 2.5 v canh single-ended receiver threshold (failures 4, 6, 7) v se(canh) v cc = 5v 1.50 1.70 1.85 v v cc = 4.75v to 5.25v 0.30 x v cc 0.37 x v cc canh single-ended receiver hysteresis hyst 10 mv maxim integrated 3 dc electrical characteristics (continued) max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
(v cc = +5v 5%, v batt = +5v to +42v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, v batt = 14v, r1 = 100, t a = +25c.) (notes 1, 2) (v cc = +5v 5%, v batt = +5v to +42v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, v batt = 14v, r1 = 100, t a = +25c.) (notes 1, 2) parameter symbol conditions min typ max units canl single-ended receiver threshold v se(canl) v cc = 5v 3.15 3.30 3.45 v v cc = 4.75v to 5.25v 0.63 x v cc 0.69 x v cc canl single-ended receiver hysteresis hyst failures 3, 8 10 mv rtl and rth rtl to v cc switch on-resistance r sw(rtl) i o = -10ma 36 100 ? rth to v cc switch on-resistance r sw(rth) i o = 10ma 23 100 ? output current on pin rtl i o(rtl) low-power modes, v rtl = 0 -1.25 -0.65 -0.30 ma rtl pullup current |i pu(rtl) | normal and failures 4, 6, 7, rtl = 0v 20 107 200 a rth pulldown |i pu(rth) | normal and failures 3, 8, rtl = v cc 20 106 200 a thermal shutdown shutdown junction temperature t j for shutdown 165 c t jf6 during failure 6switch off canl only 140 thermal protection hysteresis t hys 15 c parameter symbol conditions min typ max units transition time canl and canh bus output transition time recessive to dominant (10% to 90%) t (r-d) c l = 330pf, max3054 (250kbps) 38 ns c l = 220pf to 3.3nf, max3055 (125kbps) 100 700 c l = 560pf to 10nf, max3056 (40kbps) 0.7 3.3 s canl and canh bus output transition time dominant to recessive (10% to 90%) t(d-r) c l = 330pf, max3054 (250kbps) 130 ns c l = 220pf to 1nf, max3055 (125kbps) 200 1200 c l = 560pf to 3.3nf, max3056 (40kbps) 0.5 2.8 s propagation delay txd to rxd lowdominant transmission (figures 1, 2) differential reception t pdld no failures, c l = 330pf, max3054 (250kbps) 600 ns bus failures 1, 2, 5, 9, c l = 330pf, max3054 (250kbps) 750 no failures and bus failures 1, 2, 5, 9, c l = 1nf, max3055 (125kbps) 1.5 s no failures and bus failures 1, 2, 5, 9, c l = 3.3nf, max3056 (40kbps) 4.7 maxim integrated 4 dc electrical characteristics (continued) ac electrical characteristics max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
(v cc = +5v 5%, v batt = +5v to +42v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, v batt = 14v, r1 = 100, t a = +25c.) (notes 1, 2) parameter symbol conditions min typ max units single-ended reception t pdlse bus failures 3, 4, 6, 7, 8, c l = 330pf, max3054 (250kbps) 750 ns bus failures 3, 4, 6, 7, 8, c l = 1nf, max3055 (125kbps) 1. 5 s bus failures 3, 4, 6, 7, 8, c l = 3.3nf, max3056 (40kbps) 4.7 propagation delay txd to rxd highrecessive transmission (figures 1, 2) differential reception t pdhd no failures and bus failures 1, 2, 5, 9, c l = 330pf, max3054 (250kbps) 950 ns no failures and bus failures 1, 2, 5, 9, c l = 1nf, max3055 (125kbps) 1.9 s no failures and bus failures 1, 2, 5, 9, c l = 3.3nf, max3056 (40kbps) 5.95 single-ended reception t pdhse bus failures 3, 4, 6, 7, 8, c l = 330pf, max3054 (250kbps) 950 ns bus failures 3, 4, 6, 7, 8, c l = 1nf, max3055 (125kbps) 1.9 s bus failures 3, 4, 6, 7, 8, c l = 3.3nf, max3056 (40kbps) 5.95 wake-up timing minimum time for wake-up on canl and canh or wake t wake wake 8 38 s failures timing failures 3 and 8 detection time t det normal and low-power mode max3054 (250kbps), max3055 (125kbps) 1.9 5.7 9.5 ms max3056 (40kbps) 5.5 16.5 27.0 failures 4 and 7 detection time normal and low-power mode max3054 (250kbps), max3055 (125kbps) 0.3 1 1.9 max3056 (40kbps) 1.0 3.2 5.5 failure 6 detection time normal mode max3054 (250kbps), max3055 (125kbps) 0.35 1.1 1.85 max3056 (40kbps) 0.93 2.97 5.00 maxim integrated 5 ac electrical characteristics (continued) max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
note 1: all currents into the device are positive; all currents out of the device are negative. all voltages are referenced to device ground, unless otherwise noted. note 2: failure modes 1 through 9 are explained in table 1 and in the detailed description section. (v cc = +5v 5%, v batt = +5v to +42v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, v batt = 14v, r1 = 100, t a = +25c.) (notes 1, 2) parameter symbol conditions min typ max units failures 3 and 8 recovery time t rec normal and low-power mode max3054 (250kbps), max3055 (125kbps) 0.36 1.14 1.90 ms max3056 (40kbps) 1.0 3.2 5.5 failures 4 and 7 recovery time normal mode max3054 (250kbps) 1.7 5.6 9.5 s max3055 (125kbps) 7 23 38 max3056 (40kbps) 22 70 119 low-power mode max3054 (250kbps), max3055 (125kbps) 0.35 1.1 1.85 ms max3056 (40kbps) 1.0 3.2 5.5 failure 6 recovery time normal mode max3054 (250kbps), max3055 (125kbps) 150 525 900 s max3056 (40kbps) 390 1445 2500 minimum hold time of go-to-sleep command t hmin 5 50 s disable time of txd permanent dominant timer t dis(txd) v txd = 0 max3054 (250kbps), max3055 (125kbps) 0.9 4.5 ms max3056 (40kbps) 2.34 12.50 pulse count difference for failures 1, 2, 5, 9 detection ( err becomes low) count 4 pulse count difference for failures 1, 2, 5, 9 recovery ( err becomes high) 3 4 5 maxim integrated 6 ac electrical characteristics (continued) max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
figure 1. timing diagram for dynamic characteristic figure 3. test circuit for typical operating characteristics figure 2. test circuit for dynamic characteristics v txd v canl v canh v diff v diff = canh - canl v rxd t pdl t pdh v cc /2 -5v -3.2v 2.2v 0 1.4v 3.6v 5v gnd v cc +12v 125? cl cl 7 2 1 14 8 12 11 9 10 6 5 4 13 3 +5v c x = 15pf probe cap included 511? 125? 511? rth canl canh rtl wake txd inh batt err gnd rxd v cc en stb c bypass max305_ v batt r1 r1 cl cl 7 2 1 14 rth canl canh rtl txd inh batt 8 12 11 9 10 6 5 4 13 3 +5v c x = 15pf probe cap included v cc en stb wake err gnd rxd c bypass max305_ maxim integrated 7 timing diagrams/test circuits max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
(v cc = +5v, v batt = 12v, and t a = +25c. rtl = rth = 511, r1 = 125, see test circuit figure 3.) max3054 supply current vs. data rate max3054/max3055/max3056 toc02 data rate (kbps) supply current (ma) 450 400 350 300 250 200 150 100 50 33 34 35 36 37 32 0 500 t a = +125c t a = +25c t a = -40c max3055 supply current vs. data rate max3054/max3055/max3056 toc03 data rate (kbps) supply current (ma) 100 75 50 25 0 125 33 34 35 36 37 32 t a = +125c t a = +25c t a = -40c max3056 supply current vs. data rate max3054/max3055/max3056 toc04 data rate (kbps) supply current (ma) 30 20 10 34 35 36 37 38 33 0 40 t a = +125c t a = +25c t a = -40c max3054 receiver propagation delay vs. temperature max3054/max3055/max3056 toc05 temperature (c) receiver propagation delay (ns) 90 55 20 -15 250 300 350 400 450 200 -50 125 recessive dominant max3055 receiver propagation delay vs. temperature max3054/max3055/max3056 toc06 temperature (c) receiver propagation delay (ns) 90 55 20 -15 300 400 500 600 200 -50 125 recessive dominant max3056 receiver propagation delay vs. temperature max3054/max3055/max3056 toc07 temperature (c) receiver propagation delay (s) 90 55 20 -15 0.5 1.0 1.5 2.0 0 -50 125 recessive dominant c l = 3.3nf slew rate vs. temperature recessive to dominant max3054/max3055/max3056 toc01 temperature (c) slew rate (v/ms) 92 59 -7 26 5 10 15 20 0 -40 125 max3055 max3056 max3054 driver propagation delay vs. temperature max3054/max3055/max3056 toc08 temperature (c) receiver propagation delay (ns) 90 55 20 -15 125 150 175 200 100 -50 125 recessive dominant c l = 330pf max3055 driver propagation delay vs. temperature max3054/max3055/max3056 toc09 temperature (c) driver propagation delay (s) 90 55 20 -15 -50 125 c l = 1nf recessive dominant 400 500 600 700 300 maxim integrated 8 typical operating characteristics max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
(v cc = +5v, v batt = 12v, and t a = +25c. rtl = rth = 511, r1 = 125, see test circuit figure 3.) max3056 driver propagation delay vs. temperature max3054/max3055/max3056 toc10 temperature (c) driver propagation delay (s) 90 55 20 -15 -50 125 c l = 3.3nf recessive dominant 2.0 2.5 3.0 3.5 1.5 receiver output low vs. output current max3054/max3055/max3056 toc11 output current (ma) voltage rxd (v) 25 20 15 10 5 0.5 1.0 1.5 2.0 2.5 3.0 0 0 30 t a = +125c t a = +25c t a = -40c receiver output high vs. output current max3054/max3055/max3056 toc12 output current (ma) voltage rxd (v) 15 12 9 6 3 0.6 1.2 1.8 2.4 3.0 0 0 18 t a = +125c t a = +25c t a = -40c differential voltage vs. load resistance max3054/max3055/max3056 toc13 load resistance (?) differential voltage (v) 400 300 200 100 1 2 3 4 5 0 0 500 t a = +25c t a = +125c t a = -40c max3054 receiver propagation delay max3054/max3055/max3056 toc14 200ns/div differential input 5v/div rxd 5v/div max3055 receiver propagation delay max3054/max3055/max3056 toc15 400ns/div differential input 5v/div rxd 5v/div max3056 receiver propagation delay max3054/max3055/max3056 toc16 1s/div differential input 5v/div rxd 5v/div maxim integrated 9 typical operating characteristics (continued) max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
(v cc = +5v, v batt = 12v, and t a = +25c. rtl = rth = 511, r1 = 125, see test circuit figure 3.) driver propagation delay recessive to dominant max3054/max3055/max3056 toc17 1s/div txd 5v/div max3054 max3055 max3056 driver propagation delay dominant to recessive max3054/max3055/max3056 toc18 1s/div txd 5v/div max3056 max3055 max3054 txd-to-rxd propagation delay dominant to recessive max3054/max3055/max3056 toc19 1s/div txd max3056 max3055 max3054 txd-to-rxd propagation delay recessive to dominant max3054/max3055/max3056 toc20 1s/div txd max3054 max3055 max3056 max3056 can bus at 40kbps max3054/max3055/max3056 toc21 4s/div canh - canl 5v/div fft 1v/div max3055 can bus at 125kbps max3054/max3055/max3056 toc22 2s/div canh - canl 5v/div fft 1v/div max3054 can bus at 250kbps max3054/max3055/max3056 toc23 400ns/div canh - canl 10v/div fft 1v/div maxim integrated 10 typical operating characteristics (continued) max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
detailed description the max3054/max3055/max3056 interface between the protocol controller and the physical wires of the bus lines in a can. the devices provide differential transmit capability and switch to single-wire mode if certain fault conditions occur (see the failure management section). the max3054/max3055/max3056 guarantee full wake - up capability during failure modes. the extended fault-protection range of canh and canl bus lines (80v). a current-limiting circuit protects the transmitter output stage against overcurrent faults. this feature prevents destruction of the transmitter output stage. if the junction temperature exceeds a value of approximately +165c, the transmitter output stages are disabled. the canh and canl lines are also protected against electrical transients, which can occur in harsh environments. the transceiver provides three low-power modes that can be entered and exited through pins stb and en. an output inh pin can be used for deactivation of an external voltage regulator. the max3054/max3055/max3056 are designed to pro - vide optimal operation for a specified data rate. the max3054 is ideal for high data rates of 250kbps. the max3055 is used for data rates of 125kbps and the max3056 is designed for 40kbps applications. for the 40kbps and 125kbps versions, the built-in slope-control feature allows the use of unshielded cables and receiver input filters guarantee high noise immunity. normal operation mode transmitter the transmitter converts a single-ended input (txd) from the can controller to differential outputs for the bus lines (canh, canl). receiver the receiver takes differential input from the bus lines (canh, canl) and converts this data as a singleended output (rxd) to the can controller. it consists of a com - parator that senses the difference v = (canh - canl) with respect to an internal threshold. batt the main function of batt is to supply power to the device when +12v voltage is supplied. pin name function 1 inh inhibit output. inhibit output is for switching an external voltage regulator if a wake-up signal occurs. 2 txd transmit data input 3 rxd receive data output 4 err error. wake-up and power-on indication output; active low in normal operating mode when the bus has a failure and in low-power modes (wake-up signal or power-on standby). 5 stb standby. the digital control signal input (active low) defnes, together with input signal on pin en, the state of the transceiver (in normal and low-power modes). 6 en enable. the digital control signal input defnes, together with input signal on pin stb , the state of the transceiver (in normal and low-power modes). 7 wake wake-up. local wake-up signal input; falling and rising edges are both detected. 8 rth termination resistor. termination resistor connection for canh bus. 9 rtl termination resistor. termination resistor connection for canl bus. 10 v cc supply voltage. bypass to ground with a 0.1f capacitor. 11 canh high-level voltage bus line 12 canl low-level voltage bus line 13 gnd ground 14 batt battery supply. bypass to ground with a 0.1f capacitor. maxim integrated 11 pin description max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
inh inhibit is an output that allows for the control of an exter - nal voltage regulator. on a wake-up request or power-up on batt, the transceiver sets the output inh high. this feature enables the external voltage regulator to be shut down during sleep mode to reduce power consumption. inh is floating while entering the sleep mode and stays floating during the sleep mode. if inh is left floating, it is not set to a high level again until the following events occur: power-on (v batt switching on at cold start) rising or falling edge on wake dominant signal longer than 38s during en or stb at low level the signals on stb and en are internally set to low level when v cc is below a certain threshold voltage providing fail-safe functionality. after power-on (v batt switched on) the signal on inh becomes high and an internal power-on flag is set. this flag can be read in the power-on standby mode through err ( stb = 1, en = 0) and is reset by entering the nor - mal operating mode. err err is a wake-up and power-on indicator as well as an error detector. upon power-up, wake up, or when a bus failure is detected, the output signal on err becomes low. upon error recovery, the output signal on err is set high. stb stb is the standby digital control signal into the logic controller. this is an active-low input that is used with en to define the status of the transceiver in normal and low- power modes. en en is the enable digital control signal into the logic con - troller used in conjunction with stb to define the status of the transceiver in normal and low-power modes. wake wake is an input to the logic controller within the device to signal a wake-up condition. if wake receives a positive or negative pulse for a period longer than t wake , wake up occurs. figure 5. block diagram filter filter thermal shutdown driver fault detection wake-up standby controller 4ms receiver ipd gnd inh wake stb en txd err rxd 1 7 5 6 2 4 3 batt 10 9 11 12 8 v cc rtl canh canl rth max305_ maxim integrated 12 max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
driver output protection thermal shutdown if the junction temperature exceeds +165c the driver is switched off. thermal hysteresis is 15c, disabling ther - mal shutdown once the temperature reaches +150c. overcurrent protection a current-limiting circuit protects the transmitter output stage against a short circuit to a positive and negative battery voltage. although the power dissipation increases during this fault condition, this feature prevents destruc - tion of the transmitter output stage. failure management the failure detector is fully active in normal operating mode. after the detection of a single failure the detector switches to the appropriate state (see table 1). the differential receiver threshold voltage is set to -3.2v typically (v cc = 5v). this ensures correct reception with a noise margin as high as possible in the normal operating mode and in the event of failure 1, 2, 5, 9. if any of the wiring failures occur, the output signal on pin err becomes low after detection. on error recovery, the output signal on pin err becomes high. table 1. failure states failure 1canh wire interrupted (normal mode only) failure 2canl wire interrupted (normal mode only) mode description detection the external termination resistance connected to the rth pin provides an instantaneous pulldown of the open canh line to gnd. detection is provided, sensing the pulse-count difference between canh and canl (pulse count = 4). receiver the receiver remains in differential mode. no received data lost. driver driver remains in differential mode. no transmission data lost. recovery recovery is provided sensing the pulse-count difference between canh and canl after the detection of four consecutive pulses. mode description detection the external termination resistance connected to the rtl pin provides an instantaneous pullup of the canl line to v cc . detection is provided, sensing the pulse-count difference between canl and canh (pulse count = 4). receiver the receiver remains in differential mode. no received data lost. driver driver remains in differential mode. no transmission data lost. recovery recovery is provided, sensing the pulse-count difference between canl and canh after the detection of four consecutive pulses. failure description mode 1 canh wire interrupted normal 2 canl wire interrupted normal 3 canh short circuited to battery all 4 canl short circuited to ground all 5 canh short circuited to ground normal 6 canl short circuited to battery normal 7 canl mutually short circuited to canh all 8 canh short circuited to v cc all 9 canl short circuited to v cc normal maxim integrated 13 max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
failure 3canh short-circuited to battery failure 4canl short-circuited to gnd failure 5canh short-circuited to ground or below ground (normal mode only) failure 6canl short-circuited to battery (normal mode only) failure 7canl mutually short-circuited to canh table 1. failure states (continued) mode description detection sensing a permanent dominant condition on canh for a timeout period. receiver receiver switches to single ended on canl. driver canh and rth are both switched off (high impedance) and transmission continues on canl after timeout. recovery when the short is removed, the recessive bus voltage is restored. if the differential voltage remains below the recessive threshold level for the timeout period, reception and transmission switch back to the differential mode. mode description detection sensing a permanent dominant condition for a timeout period. receiver receiver switches to single ended on canh. driver canl and rtl are both switched off (high impedance) and transmission continues on canh after timeout. recovery when the short is removed, the recessive bus voltage is restored. if the differential voltage remains below the recessive threshold level for the timeout period, reception and transmission switch back to the differential mode. mode description detection detection is provided, sensing the pulse-count difference between canh and canl (pulse count = 4). receiver receiver remains in differential mode. no received data lost. driver rth remains on and canh remains enabled. recovery recovery is provided, sensing the edge-count difference between canh and canl after the detection of four consecutive pulses. mode description detection detected by a comparator for canl > 7.3v after a timeout period. receiver receiver switches to single ended on canh after timeout. driver rtl is switched off after timeout. canh remains active. recovery sensing canl < 7.3v after the timeout period. mode description detection sensing a permanent dominant condition on the differential comparator (canh - canl > -3.2v) for the timeout period. receiver receiver switches to canh single-ended mode after timeout. driver canl and rtl are both switched off after timeout. transmission remains ongoing on canh. recovery when the short is removed, the recessive bus voltage is restored (rtl on if canh - canl < -3.2v) but canl still remains disabled and err = 0. if the differential voltage remains below the recessive threshold level (canh - canl < -3.2v) for the timeout period, reception and transmission switch back to the differential mode. maxim integrated 14 max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
failure 8canh short-circuited to v cc table 1. failure states (continued) failure 9canl short-circuited to v cc (normal mode only) table 2. summary of the driver outputs and internal switches state during fault conditions note: the rth-pulldown current switch and the rtl-pullup current switch are closed in normal mode with or without fault conditions, open in sleep mode. mode description detection sensing a permanent dominant condition on canh for a timeout period. receiver receiver switches to single ended on canl. data lost (permanent dominant) during timeout. driver canh and rth are both switched off (high impedance) and transmission continues on canl after timeout. only a weak pulldown current on pin rth remains. recovery when the short is removed (canh < 1.7v) and after a timeout, canl is forced recessive (canl off) and canh is enabled (rth on and canh enabled). signal can be transmitted or received in single ended on canh and err remains low. if the differential voltage remains below the recessive threshold level (canh - canl < -3.2v) for a second timeout, reception and transmission switch back to the differential mode and err is released high. mode description detection detection is provided, sensing the pulse-count difference between canl and canh (pulse count = 4). receiver receiver remains in differential mode. no received data lost. driver driver remains in differential mode. no transmission data lost. recovery recovery is provided, sensing the pulse-count difference between canl and canh after the detection of four consecutive pulses. failure no. description mode internal switches state driver outputs state canh canl no failure normal rth, rtl on enabled enabled no failure low power rth, i_rtl on disabled disabled 1 canh wire interrupted normal rth, rtl on enabled enabled 2 canl wire interrupted normal rth, rtl on enabled enabled 3 canh short to batt all rth off disabled enabled 4 canl short to gnd all rtl or i_rtl off enabled disabled 5 canh short to gnd normal rth, rtl on enabled enabled 6 canl short to batt normal rtl off, rth on enabled enabled 7 canl short to canh all rtl or i_rtl off enabled disabled 8 canh short to v cc all rth off disabled enabled 9 canl short to v cc normal rth, rtl on enabled enabled maxim integrated 15 max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
note 3: in case the go-to-sleep command was used before. note 4: if the supply voltage v cc is present. note 5: wake-up interrupts are released when entering the normal operating mode. low-power modes the transceiver provides three low-power modes that can be entered or exited through pins stb and en (table 3). sleep mode the sleep mode is the mode with the lowest power con - sumption. inh is switched to high impedance for deacti - vation of the external voltage regulator. canl is biased to the battery voltage through rtl. if the supply voltage is provided, rxd and err signal the wake-up interrupt. standby mode the standby mode reacts the same as the sleep mode but with a high level on inh. standby mode can be used when the external voltage regulator needs to be kept active during low-power operation. power-on standby mode the power-on standby mode behaves similarly to the standby mode with the battery power-on flag of the wake- up interrupt signal on err . this mode is only for reading the power-on flag. inh can be high or low in the power- on standby mode. when the device goes from standby mode to power-on standby mode, inh is high. when the device goes from sleep mode to power-on standby mode, inh is low. wake-up wake-up requests are recognized by the transceiver when a dominant signal is detected on either bus line or if wake detects a pulse for more than 38s. on a wake-up request, inh is set high to activate an external voltage regulator. if v cc is provided, the wake-up request can be read on the err or rxd outputs. to prevent false wake-up due to transients or rf fields, the wake-up voltage levels have to be maintained for more than 38s. in the low-power modes, the failure detection circuit remains partly active to prevent increased power consumption in the event of failures 3, 4, 7, and 8. applications information the max3054/max3055/max3056 are capable of sus - taining a network of up to 32 transceivers on a single bus. the fault-tolerant transceivers are designed to operate at a total termination resistance of 100. both canh and canl lines are terminated with 100. since the total ter - mination resistance of the system is distributed over the entire bus, each of the transceivers contributes only part of the total 100 termination. the values of the termina - tion resistors rtl and rth vary according to the size of the system and need to be calculated. it is not required that each transceiver be terminated with the same value, the total termination need only be a total 100. the minimum termination resistor value allowed for each transceiver is 500, due to the driving capability of rth and rtl. this makes it impossible to achieve a total termination resistance of 100 for systems smaller than five transceivers. typically this does not create a prob - lem because smaller systems usually have shorter bus cables and have no problem with higher total termination resistance. to reduce emi in the case of an interrupted bus wire it is recommended not to exceed 6k termination resistance at a single transceiver even though a higher value is specified. table 3. low-power modes mode stb en err rxd rtl switched to low high low high go-to-sleep command 0 1 wake-up interrupt signal (notes 2 and 3) wake-up interrupt signal (notes 2 and 3) v batt sleep 0 0 (note 1) standby 0 0 power-on standby 1 0 v batt power-on fag wake-up interrupt signal (notes 2 and 3) v batt normal operating 1 1 error fag no error fag dominant received data recessive received data v cc maxim integrated 16 max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
reduced emi and refections due to internal slope control for the max3055/max3056, the canh and canl outputs are slew-rate limited. this minimizes emi and reduces reflections caused by improp - erly terminated cables. in general, a transmitters rise time relates directly to the length of an unterminated stub, which can be driven with only minor waveform reflections. the fol - lowing equation expresses this relationship conservatively: length = t rise /(15ns/ft) where t rise is the transmitters rise time. the max3054/max3055/max3056 require no special lay - out 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. maxim integrated 17 chip information transistor count: 1300 process: bicmos max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver www.maximintegrated.com
14l soic.eps ? 2014 maxim integrated products, inc. 18 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. 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 specifcations 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. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. max3054/max3055/ max3056 80v fault-protected/tolerant can transceiver for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.

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