View MAX3050ASA_8547895.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

general description the max3050 and max3057 interface between the can protocol controller and the physical wires of the bus lines in a control area network (can). they are primarily intended for systems requiring data rates up to 2mbps and feature 80v fault protection against shorts in high- voltage power buses. they provide differential transmit capability to the bus and differential receive capability to the can controller. the max3050 and max3057 have four modes of operation: high speed, slope control, standby, and shutdown. high- speed mode allows data rates up to 2mbps. in slope-control mode, data rates are 40kbps to 500kbps, so the effects of emi are reduced, and unshielded twisted or parallel cable can be used. in standby mode, the transmitters are shut off and the receivers are put into low-current mode. in shutdown mode, the transmitter and receiver are switched off. the max3050 has an autoshutdown? function that puts the device into a 15ms shutdown mode when the bus or can controller is inactive for 4ms or longer. the max3050 and max3057 are available in an 8-pin so package and are specified for operation from -40c to +125c. applications hvac controls telecom 72v systems features 80v fault protection for 42v systems four operating modes: ? high-speed operation up to 2mbps ? slope-control mode to reduce emi (40kbps to 500kbps) ? standby mode ? low-current shutdown mode autoshutdown when device is inactive (max3050) automatic wake-up from shutdown (max3050) thermal shutdown current limiting fully compatible with the iso 11898 standard 19-2670; rev 1; 6/14 autoshutdown is a trademark of maxim integrated products, inc. part temp range pin-package max3050 asa -40c to +125c 8 so max3057 asa -40c to +125c 8 so canl rxd 1 2 8 7 rs canh gnd v cc txd so top view 3 4 6 5 max3050 max3057 shdn max3050 max3057 can controller txd v cc rxd rs gnd canh canl v cc (100nf) 120? 120? tx0 rx0 gnd 0.1f 30pf 24k? to 180k? shdn ( ) are for 3050 only. ordering information pin confguration typical operating circuit max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers
v cc to gnd ............................................................ -0.3v to +6v txd, rs, rxd, shdn to gnd....................-0.3v to (v cc + 0.3v) rxd shorted to gnd................................................. continuous canh, canl to gnd...........................-80v to +80v continuous continuous power dissipation (t a = +70c) 8-pin so (derate 5.9mw/c above +70c) .................470mw operating temperature range .........................-40c to +125c junction temperature......................................................+150c storage temperature range .............................-65c to +150c lead temperature (soldering, 10s) ................................+300c (v cc = +5v 10%, r l = 60, rs = gnd, t a = t min to t max . typical values are at v cc = +5v and t a = +25c.) parameter symbol conditions min typ max units supply current i s dominant (note 1) 56 72 ma dominant no load 6 recessive (note 1) 3.6 5.5 recessive no load 5.5 quiescent current standby mode i q v rs = v cc 125 260 a shutdown supply current i q shdn shdn = gnd 15 30 a thermal-shutdown threshold 160 c thermal-shutdown hysteresis 20 c txd input levels high-level input voltage v ih 2 v low-level input voltage v il 0.4 v high-level input current i ih v txd = v cc 1 a pullup resistor r intxd 20 k? canh, canl transmitter recessive bus voltage v canh, v canl v txd = v cc , no load 2 3 v off-state output leakage i lo -2v < v canh , v canl < +7v shdn = gnd, v txd = v cc -2 +1 ma -80v < v canh , v canl < +80v shdn = gnd, v txd = v cc -4 +4 canh output voltage v canh v txd = 0 3.0 v cc v canl output voltage v canl v txd = 0 0 2.0 v differential output (v canh - v canl ) d v canh , v canl v txd = 0 1.5 5 v v txd = 0, r l = 45? 1.5 v txd = v cc , no load -500 +50 mv canh short-circuit current i sc v canh = -5v -200 ma canl short-circuit current i sc v canl = 18v 200 ma esd canh, canl (note 2) human body model 2 kv iec1000-4-2 air gap 3 iec1000-4-2 contact discharge 2.5 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 max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
(v cc = +5v 10%, r l = 60, rs = gnd, t a = t min to t max . typical values are at v cc = +5v and t a = +25c.) parameter symbol conditions min typ max units dc bus receiver (v txd = v cc ; canh and canl externally driven; -2v < v canh , v canl < +7v, unless otherwise specifed) differential input voltage (recessive) v diff -7v < v canh , v canl < +12v -1.0 +0.5 v differential input voltage (dominant) v diff -7v < v canh , v canl < +12v 0.9 3.3 v differential input hysteresis v diff (hyst) 150 mv canh input wake-up voltage threshold v canh ( shdn ) shdn = gnd, v txd = v cc (max3050) 6 9 v rxd high-level output voltage v oh i = -100a 0.8 x v cc v rxd low-level output voltage v ol i = 10ma 0.8 v i = 5ma 0.4 canh and canl input resistance r i 5 25 k? differential input resistance r diff 10 100 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 = 24k? to 180k? 0.4 x v cc 0.6 x v cc v slope-control mode current i slope r rs = 24k? to 180k? -10 -200 a standby mode i stby -10 +10 a high-speed mode current i hs v rs = 0 -500 a shutdown shdn input pullup resistor r in shdn max3057 500 900 k? shdn input voltage high 2 v maxim integrated 3 dc electrical characteristics (continued) max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
(v cc = +5v 10%, r l = 60, c l = 100pf, t a = t min to t max . typical values are at v cc = +5v and t a = +25c.) (figures 1, 2, and 3) note 1: as defined by iso, bus value is one of two complementary logical values: dominant or recessive. the dominant value represents the logical 1 and the recessive represents the logical 0. during the simultaneous transmission of the dominant and recessive bits, the resulting bus value is dominant. for max3050 and max3057 values, see the truth table in the transmitter and receiver sections under detailed description . note 2: the esd structures do not short out canh and canl under an esd event while -7v < canh, canl < +12v. parameter symbol conditions min typ max units timing minimum bit time t bit v rs = 0 (2mbps) 0.5 s r rs = 24k? (500kbps) 2 r rs = 100k? (125kbps) 8 r rs = 180k? (62.5kbps) 25 delay txd to bus active t ontxd v rs = 0 40 ns delay txd to bus inactive t offtxd v rs = 0 75 ns delay txd to receiver active t onrxd v rs = 0 (2mbps) 120 ns r rs = 24k? (500kbps) 0.4 s r rs = 100k? (125kbps) 1.6 r rs = 180k? (62.5kbps) 5.0 delay txd to receiver inactive t offrxd v rs = 0 (2mbps) 130 ns r rs = 24k? (500kbps) 0.45 s r rs = 100k? (125kbps) 1.6 r rs = 180k? (62.5kbps) 5.0 differential output slew rate sr r rs = 24k? (500kbps) 14 v/s r rs = 100k? (125kbps) 7 r rs = 180k? (62.5kbps) 1.6 bus dominant to rxd low standby mode 10 s time to wake up: canh > 9v t wake shdn = gnd, v txd = v cc (max3050) 10 s time to sleep mode when bus is recessive t shdn c shdn = 100nf (max3050) 10 47 ms maxim integrated 4 timing characteristics max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
figure 1. ac test circuit figure 2. timing diagram for dynamic characteristics figure 3. time to wake-up (t wake ) (max3050) max3050 max3057 can controller txd v cc rxd rs gnd canh canl v cc (100nf) 120? 120? tx0 rx0 gnd 0.1f 30pf 24k? to 180k? shdn 100pf ( ) are for max3050 only. canh - canl rxd txd canl canh 0.9v v cc /2 v cc /2 t onrxd t ontxd t offrxd t offtxd 0.5v recessive dominant 9v canh t wake v shdn v shdn = 2v maxim integrated 5 max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
(v cc = 5v, r l = 60, c l = 100pf, t a = +25c, unless otherwise specifed.) max3050 toc02 sleep time (ms) 300 200 100 20 40 60 80 100 0 0 400 autoshutdown vs. c shdn c shdn (nf) supply current vs. data rate max3050 toc03 data rate (kbps) supply current (ma) 1600 1200 800 400 27 29 31 33 35 25 0 2000 t a = +125c t a = +25c t a = -40c receiver propagation delay vs. temperature, r rs = gnd max3050 toc04 temperature (c) receiver propagation delay (ns) 90 55 20 -15 25 35 45 55 65 15 -50 125 recessive dominant driver propagation delay vs. temperature, r rs = gnd max3050 toc05 temperature (c) driver propagation delay (ns) 92 59 26 -7 20 25 30 35 15 -40 125 recessive dominant receiver output low vs. output current max3050 toc06 output current (ma) voltage rxd (mv) 20 15 10 5 400 800 1200 1600 0 0 25 t a = +125c t a = +25c t a = -40c receiver output high vs. output current max3050 toc07 output current (ma) voltage rxd (mv) 20 15 10 5 600 1200 1800 3000 2400 0 0 25 t a = +125c t a = +25c t a = -40c slew rate vs. r rs max3057 max3050 toc01 r rs (k?) slew rate (v/s) 162 124 86 48 5 10 15 20 25 0 10 200 t a = -40c t a = +25c t a = -+125c differential voltage vs. differential load r l max3050 toc08 differential load r l (?) differential voltage (v) 250 200 150 100 50 1 2 3 4 0 0 300 t a = +125c t a = +25c t a = -40c supply current vs. temperature in standby mode max3050 toc09 temperature (c) supply current (a) 90 55 20 -15 75 100 125 150 175 200 50 -50 125 maxim integrated 6 typical operating characteristics max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
(v cc = 5v, r l = 60, c l = 100pf, t a = +25c, unless otherwise specifed.) pin name function 1 txd transmit data input. txd is a cmos/ttl-compatible input from a can controller. 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 from the physical bus lines canh and canl. 5 shdn shutdown input. drive shdn low to put into shutdown mode. see the detailed description section for a full explanation of shdn behavior. 6 canl can bus line low. canl is fault protected to 80v. 7 canh can bus line high. canh is fault protected to 80v. 8 rs mode select pin. drive rs low or connect to gnd for high-speed operation. connect a resistor from rs to gnd to control output slope. drive rs high to put into standby mode. see the mode selection section under detailed description . loopback propagation delay vs. r rs max3050 toc10 r rs (k?) loopback propagation delay (ns) 150 100 50 200 400 600 800 1000 1200 1400 0 0 200 receiver propagation delay max3050 toc11 40ns/div rxd 2v/div canh - canl driver propagation delay max3050 toc12 40ns/div txd 2v/div canh - canl r rs = gnd driver propagation delay max3050 toc13 1s/div txd 5v/div r rs = 24k? r rs = 100k? r rs = 180k? maxim integrated 7 pin description 7slfdo2shudwlkdudfwhulvwlfvfrwlxhg max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
detailed description the max3050 and max3057 interface between the protocol controller and the physical wires of the bus lines in a can. they are primarily intended for applications requiring data rates up to 2mbps and feature 80v fault protection against shorts in high-voltage systems. this fault protection allows the devices to withstand up to 80v with respect to ground with no damage to the device. the built-in fault tolerance allows the device to survive in industrial environments with no external protection devices. the devices provide differential transmit capabil - ity to the bus and differential receive capability to the can controller. (see figure 4.) the device has four modes of operation: high speed, slope control, standby, and shutdown. in high-speed mode, slew rates are not limited, making 2mbps transmission speeds possible. slew rates are controlled in slopecontrol mode, minimizing emi and allowing use of unshielded twisted or parallel cable. in standby mode, receivers are active and transmitters are in high impedance. in shutdown mode, transmitters and receivers are turned off. the transceivers are designed to operate from a single +5v supply and draw 56ma of supply current in dominant state and 3.6ma in recessive state. in standby mode, supply current is reduced to 135a. in shutdown mode, supply current is 15a. 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. fault protection the max3050 and max3057 feature 80v fault protec - tion. this extended voltage range of canh and canl bus lines allows use in high-voltage systems and com munication with high-voltage buses. if data is transmitting at 2mbps, the fault protection is reduced to 70v. 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. figure 4. functional diagram 0.75v thermal shutdown transmitter control mode selection auto shutdown receiver 7.5v v cc rs rxd gnd canl canh txd max3050 max3057 shdn w ake maxim integrated 8 max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
high speed connect rs to ground to set the max3050 and max3057 to high-speed mode. when operating in high-speed mode, the max3050 and max3057 can achieve trans - mission rates of up to 2mbps. line drivers are switched on and off as quickly as possible. however, in this mode, no measures are taken to limit the rise and fall slope of the data signal, allowing for potential emi emissions. if using the max3050 and max3057 in high-speed mode, use shielded twistedpair cable to avoid emi problems. slope control connect a resistor from rs to ground to select slope - control mode. (see table 2.) in slope-control mode, the gates of the line drivers are charged with a controlled current, proportional to the resistor connected to the rs pin. transmission speed ranges from 40kbps to 500kbps. controlling the rise and fall slope reduces emi and allows the use of an unshielded twisted pair or a parallel pair of wires as bus lines. the transfer function for selecting the resistor value is given by: r rs (k) = 12000/speed (in kbps). see the slew rate vs. r rs graph in the typical operating characteristics section. shutdown in shutdown mode, the device is switched off. the outputs are high impedance to 80v. the max3057 features a pul - lup at shdn . if shutdown is forced low and then left floating, the device remains in shutdown until shdn is forced high. receiver the receiver reads differential input from the bus lines (canh, canl) and transfers this data as a singleended output (rxd) to the can controller. it consists of a compar - ator that senses the difference v = (canh - canl) with respect to an internal threshold of 0.7v. if this difference is positive (i.e., v > 0.7v) a logic-low is present at the rxd pin. if negative (i.e., v < 0.7v), a logic-high is present. the receiver always echoes the transmitted data. the canh and canl common-mode range is -7v to +12v. rxd is logic high when canh and canl are short - ed or terminated and undriven. if the differential receiver input voltage (canh - canl) is less than or equal to 0.5v, rxd is logic high. if (canh - canl) is greater than or equal to 0.9v, rxd is logic low. standby the max3050 and max3057 transmitters are threes - tated, and the receivers are active in standby. this allows the device to read data on the bus while reducing power consumption. receivers take up to 10ms to wake up from standby mode. therefore, the first bits of information read off the bus when coming out of standby can be lost. thermal shutdown if the junction temperature exceeds +160c, the device is switched off. the hysteresis is approximately 20c, dis - abling thermal shutdown once the temperature reaches +140c. table 1. transmitter and receiver truth table table 2. mode selection truth table x = dont care. * as defined by iso, bus value is one of two complementary logical values: dominant or recessive. the dominant value represents the logical 0 and the recessive represents the logical 1. during the simultaneous transmission of the dominant and recessive bits, the resulting bus value is dominant. txd rs shdn canh canl bus state rxd 0 v rs < 0.75 x v cc v shdn > 1.5v high low dominant* 0 1 or foat v rs < 0.75 x v cc v shdn > 1.5v 5 to 25k? to v cc /2 5 to 25k? to v cc /2 recessive* 1 x v rs > 0.75 x v cc x floating floating floating 1 x x v shdn < 0.5v floating floating floating 1 condition forced at pin rs mode resulting current at rs v rs < 0.3 x v cc high speed |i rs | < 500a 0.4 x v cc < v rs < 0.6 ? v cc slope control 10a < |i rs | < 200a v rs > 0.75 x v cc standby |i rs | < 10a maxim integrated 9 max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
autoshutdown (max3050) to manage power consumption, autoshutdown puts the device into shutdown mode after it has been inac-tive for a period of time. the value of an external capacitor (c shdn ) connected to shdn determines the threshold of inactivity time, after which the autoshutdown triggers. floating shdn allows the max3050 to automatically change from active mode to shutdown. use a 100nf capacitor as c shdn for a typical threshold of 20ms. change the capacitor value according to the following equation to change the threshold time period. ( ) cc i (ma) time(s) c (nf) vv = ? shdn shdn shdn drive shdn high to turn the max3050 on and disable autoshutdown. when the max3050 is in shutdown mode, only the wake- up comparator is active, and normal bus communication is ignored. the remote master of the can system wakes up the max3050 with a signal greater than 9v on canh. internal circuitry in the max3050 puts the device in nor - mal operation by driving shdn high. the max3057 does not have the autoshutdown feature. driver output protection the max3050 and max3057 have several features that protect them from damage. thermal shutdown switches off the device and puts canh and canl into high impedance if the junction temperature exceeds +160c. thermal protection is needed particularly when a bus line is short-circuited. the hysteresis for the thermal shutdown is approximately 20c. additionally, a current-limiting circuit protects the trans - mitter output stage against short-circuit to positive and negative battery voltage. although the power dissipation increases during this fault condition, this feature prevents destruction of the transmitter output stage. applications information reduced emi and refections in slope-control mode, the canh and canl outputs are slew-rate limited, minimizing emi and reducing reflections caused by improperly 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 following equation expresses this relationship conservatively: length = t rise / (15ns/ft) where t rise is the transmitters rise time. figure 5. fft dominant bus at 2mbpslayout. figure 6. fft recessive bus at 2mbps figure 7. fft dominant bus at 500kbps fft 500mv/div canh - canl 1v/div fft 200mv/div canh - canl 1v/div fft 500mv/div canh - canl 1v/div maxim integrated 10 max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
the max3050 and max3057 require no special layout considerations beyond common practices. bypass v cc to gnd with a 1f ceramic capacitor mounted close to the ic with short lead lengths and wide trace widths. figure 8. fft recessive bus at 500kbps figure 10. fft recessive bus at 62.5kbps figure 9. fft dominant bus at 62.5kbps fft 200mv/div canh - canl 1v/div fft 200mv/div canh - canl 1v/div fft 500mv/div canh - canl 1v/div maxim integrated 11 chip information transistor count: 1214 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. package type package code outline no. land pattern no. 8 soic s8+5 21-0041 90-0096 max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers www.maximintegrated.com
? 2014 maxim integrated products, inc. 12 revision history revision number revision date description pages changed 0 10/02 initial release 1 6/14 removed automotive references 1, 8 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. max3050/max3057 80v fault-protected, 2mbps, low-supply current can transceivers for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com.

▲Up To Search▲

Price & Availability of MAX3050ASA

	To Download MAX3050ASA Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .