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19-2670; Rev 0; 10/02 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers General Description The MAX3050/MAX3057 interface between the CAN protocol controller and the physical wires of the bus lines in a controller area network (CAN). They are primarily intended for automotive systems requiring data rates up to 2Mbps and feature 80V fault protection against short circuits in high-voltage power buses. They provide differential transmit capability to the bus and differential receive capability to the CAN controller. The MAX3050/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 AutoShutdownTM function that puts the device into a 15A shutdown mode when the bus or CAN controller is inactive for 4ms or longer. The MAX3050/MAX3057 are available in an 8-pin SO package and are specified for operation from -40C to +125C. Features o 80V Fault Protection for 42V Systems o Four Operating Modes High-Speed Operation Up to 2Mbps Slope-Control Mode to Reduce EMI (40kbps to 500kbps) Standby Mode Low-Current Shutdown Mode o AutoShutdown when Device Is Inactive (MAX3050) o Automatic Wake-Up from Shutdown (MAX3050) o Thermal Shutdown o Current Limiting o Fully Compatible with the ISO 11898 Standard* * Pending completion of testing. MAX3050/MAX3057 Ordering Information PART MAX3050ASA MAX3057ASA TEMP RANGE -40C to +125C -40C to +125C PIN-PACKAGE 8 SO 8 SO Pin Configuration TOP VIEW TXD 1 GND VCC 2 3 8 7 RS CANH CANL SHDN Applications Automotive Systems HVAC Controls Telecom 72V systems MAX3050 MAX3057 6 5 RXD 4 AutoShutdown is a trademark of Maxim Integrated Products, Inc. SO Typical Operating Circuit VCC 120 0.1F CAN CONTROLLER VCC CANH TX0 RX0 30pF GND 24k TO 180k TXD RXD MAX3050 MAX3057 CANL (100nF) SHDN RS GND 120 ( ) ARE FOR 3050 ONLY. ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers MAX3050/MAX3057 ABSOLUTE MAXIMUM RATINGS VCC to GND ............................................................ -0.3V to +6V TXD, RS, RXD, SHDN to GND ....................-0.3V to (VCC + 0.3V) CANH, CANL to GND..............................................-80V to +80V RXD Shorted to GND................................................. Continuous Continuous Power Dissipation (TA = +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 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. DC ELECTRICAL CHARACTERISTICS (VCC = +5V 10%, RL = 60, RS = GND, TA = TMIN to TMAX. Typical values are at VCC = +5V and TA = +25C.) PARAMETER SYMBOL CONDITIONS Dominant (Note 1) Supply Current IS Dominant no load Recessive (Note 1) Recessive no load Quiescent Current Standby Mode Shutdown Supply Current Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis TXD INPUT LEVELS High-Level Input Voltage Low-Level Input Voltage High-Level Input Current Pullup Resistor CANH, CANL TRANSMITTER Recessive Bus Voltage VCANH, VCANL VTXD = VCC, no load -2V < VCANH, VCANL < +7V SHDN = GND, VTXD = VCC -80V < VCANH, VCANL < +80V SHDN = GND, VTXD = VCC VTXD = 0 VTXD = 0 VTXD = 0 VTXD = 0, RL = 45 VTXD = VCC, no load VCANH = -5V VCANL = 18V 2 -2 -4 3.0 0 1.5 1.5 -500 -200 200 +50 3 +1 mA +4 VCC 2.0 5 V V V mV mA mA V VIH VIL IIH RINTXD VTXD = VCC 1 20 2 0.4 V V A k IQ IQSHDN VRS = VCC SHDN = GND 125 15 160 20 3.6 MIN TYP 56 MAX 72 6 5.5 5.5 260 30 A A C C mA UNITS Off-State Output Leakage ILO CANH Output Voltage CANL Output Voltage Differential Output (VCANH - VCANL) CANH Short-Circuit Current CANL Short-Circuit Current VCANH VCANL VCANH, VCANL ISC ISC 2 _______________________________________________________________________________________ 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers DC ELECTRICAL CHARACTERISTICS (continued) (VCC = +5V 10%, RL = 60, RS = GND, TA = TMIN to TMAX. Typical values are at VCC = +5V and TA = +25C.) PARAMETER Differential Input Voltage (Recessive) Differential Input Voltage (Dominant) Differential Input Hysteresis CANH Input Wake-Up Voltage Threshold RXD High-Level Output Voltage RXD Low-Level Output Voltage CANH and CANL Input Resistance Differential Input Resistance MODE SELECTION (RS) Input Voltage for High Speed Input Voltage for Standby Slope-Control Mode Voltage Slope-Control Mode Current Standby Mode High-Speed Mode Current SHUTDOWN SHDN Input Pullup Resistor SHDN Input Voltage High SHDN Input Voltage Low RINSHDN MAX3057 500 2 0.5 900 k V V VSLP VSTBY VSLOPE ISLOPE ISTBY IHS VRS = 0 RRS = 24k to 180k RRS = 24k to 180k 0.75 VCC 0.4 VCC -200 -10 0.6 VCC -10 +10 -500 0.3 VCC V V V A A A SYMBOL CONDITIONS MIN TYP MAX UNITS MAX3050/MAX3057 DC BUS RECEIVER (VTXD = VCC; CANH and CANL externally driven; -2V < VCANH, VCANL < +7V, unless otherwise specified) VDIFF VDIFF VDIFF(HYST) VCANH (SHDN) -7V < VCANH, VCANL < +12V -7V < VCANH, VCANL < +12V -1.0 0.9 150 +0.5 3.3 V V mV SHDN = GND, VTXD = VCC (MAX3050) I = -100A I = 10mA I = 5mA 6 0.8 VCC 9 V V VOH VOL RI RDIFF 0.8 0.4 5 10 25 100 V k k _______________________________________________________________________________________ 3 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers MAX3050/MAX3057 TIMING CHARACTERISTICS (VCC = +5V 10%, RL = 60, CL = 100pF, TA = TMIN to TMAX. Typical values are at VCC = +5V and TA = +25C.) (Figures 1, 2, and 3) PARAMETER TIMING VRS = 0 (2Mbps) Minimum Bit Time tBIT RRS = 24k (500kbps) RRS = 100k (125kbps) RRS = 180k (62.5kbps) Delay TXD to Bus Active Delay TXD to Bus Inactive tONTXD tOFFTXD VRS = 0 VRS = 0 VRS = 0 (2Mbps) Delay TXD to Receiver Active tONRXD RRS = 24k (500kbps) RRS = 100k (125kbps) RRS = 180k (62.5kbps) VRS = 0 (2Mbps) Delay TXD to Receiver Inactive tOFFRXD RRS = 24k (500kbps) RRS = 100k (125kbps) RRS = 180k (62.5kbps) RRS = 24k (500kbps) Differential Output Slew Rate Bus Dominant to RXD Low Time to Wake Up: CANH > 9V Time to Sleep Mode when Bus Is Recessive tWAKE tSHDN SR RRS = 100k (125kbps) RRS = 180k (62.5kbps) Standby mode SHDN = GND, VTXD = VCC (MAX3050) CSHDN = 100nF (MAX3050) 10 14 7 1.6 10 10 47 s s ms V/s 0.5 2 8 25 40 75 120 0.4 1.6 5.0 130 0.45 1.6 5.0 s ns s ns ns ns s SYMBOL CONDITIONS MIN TYP MAX UNITS 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. 4 _______________________________________________________________________________________ 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers MAX3050/MAX3057 VCC 120 0.1F CAN CONTROLLER VCC CANH 100pF TX0 RX0 30pF GND 24k TO 180k MAX3050 MAX3057 CANL TXD RXD SHDN RS GND (100nF) 120 ( ) ARE FOR MAX3050 ONLY. Figure 1. AC Test Circuit TXD 9V CANH CANL DOMINANT 0.9V CANH - CANL 0.5V RECESSIVE CANH VSHDN = 2V VSHDN RXD VCC/2 VCC/2 tONTXD tOFFTXD tWAKE tONRXD tOFFRXD Figure 2. Timing Diagram for Dynamic Characteristics Figure 3. Time to Wake Up (tWAKE) (MAX3050) _______________________________________________________________________________________ 5 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers MAX3050/MAX3057 Typical Operating Characteristics (VCC = 5V, RL = 60, CL = 100pF, TA = +25C, unless otherwise specified.) MAX3057 SLEW RATE vs. RRS MAX3050 toc01 MAX3050 AutoShutdown vs. CSHDN MAX3050 toc02 SUPPLY CURRENT vs. DATA RATE MAX3050 toc03 25 100 35 20 SLEW RATE (V/s) SUPPLY CURRENT (mA) TA = -40C SLEEP TIME (ms) 80 33 TA = +25C 15 TA = +25C 10 TA = -+125C 60 31 TA = +125C 40 29 5 20 27 TA = -40C 0 10 48 86 124 162 200 RRS (k) 0 0 100 200 CSHDN (nF) 300 400 25 0 400 800 1200 1600 2000 DATA RATE (kbps) RECEIVER PROPAGATION DELAY vs. TEMPERATURE, RRS = GND MAX3050 toc04 DRIVER PROPAGATION DELAY vs. TEMPERATURE, RRS = GND MAX3050 toc05 RECEIVER OUTPUT LOW vs. OUTPUT CURRENT MAX3050 toc06 65 RECEIVER PROPAGATION DELAY (ns) 35 DRIVER PROPAGATION DELAY (ns) 1600 55 RECESSIVE 45 30 RECESSIVE 25 DOMINANT 20 VOLTAGE RXD (mV) 1200 TA = +125C 800 TA = +25C 400 TA = -40C 35 DOMINANT 25 15 -50 -15 20 55 90 125 TEMPERATURE (C) 15 -40 -7 26 59 92 125 TEMPERATURE (C) 0 0 5 10 15 20 25 OUTPUT CURRENT (mA) RECEIVER OUTPUT HIGH vs. OUTPUT CURRENT MAX3050 toc07 DIFFERENTIAL VOLTAGE vs. DIFFERENTIAL LOAD RL MAX3050 toc08 SUPPLY CURRENT vs. TEMPERATURE IN STANDBY MODE MAX3050 toc09 3000 4 200 175 SUPPLY CURRENT (A) 150 125 100 75 DIFFERENTIAL VOLTAGE (V) VOLTAGE (VCC - RXD) (mV) 2400 TA = +125C 1800 3 TA = -40C TA = +125C 2 TA = +25C 1200 TA = +25C 600 TA = -40C 0 0 5 10 15 20 25 OUTPUT CURRENT (mA) 1 0 0 50 100 150 200 250 300 DIFFERENTIAL LOAD RL () 50 -50 -15 20 55 90 125 TEMPERATURE (C) 6 _______________________________________________________________________________________ 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers Typical Operating Characteristics (continued) (VCC = 5V, RL = 60, CL = 100pF, TA = +25C, unless otherwise specified.) LOOPBACK PROPAGATION DELAY vs. RRS LOOPBACK PROPAGATION DELAY (ns) 1200 1000 800 600 400 200 0 0 50 100 RRS (k) 150 200 40ns/div RXD 2V/div MAX3050 toc10 MAX3050/MAX3057 RECEIVER PROPAGATION DELAY MAX3050 toc11 1400 CANH - CANL DRIVER PROPAGATION DELAY MAX3050 toc12 DRIVER PROPAGATION DELAY MAX3050 toc13 TXD 5V/div TXD 2V/div RRS = 24k RRS = 100k CANH - CANL RRS = 180k RRS = GND 40ns/div 1s/div Pin Description PIN 1 2 3 4 5 6 7 8 NAME TXD GND VCC RXD SHDN CANL CANH RS Ground Supply Voltage. Bypass VCC to GND with a 0.1F capacitor. Receive Data Output. RXD is a CMOS/TTL-compatible output from the physical bus lines CANH and CANL. Shutdown Input. Drive SHDN low to put into shutdown mode (MAX3057). Place a capacitor from SHDN to ground to utilize the AutoShutdown feature of MAX3050. See the Shutdown and AutoShutdown sections for a full explanation of SHDN behavior. CAN Bus Line Low. CANL is fault protected to 80V. CAN Bus Line High. CANH is fault protected to 80V. 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. FUNCTION Transmit Data Input. TXD is a CMOS/TTL-compatible input from a CAN controller. _______________________________________________________________________________________ 7 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers MAX3050/MAX3057 Detailed Description The MAX3050/MAX3057 interface between the protocol controller and the physical wires of the bus lines in a CAN. They are primarily intended for automotive 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 and automotive environments with no external protection devices. The devices provide differential transmit capability to the bus and differential receive capability to the CAN controller (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 125A. 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/MAX3057 feature 80V fault protection. This extended voltage range of CANH and CANL bus lines allows use in high-voltage systems and communication 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. VCC MAX3050 THERMAL SHUTDOWN CANH TXD TRANSMITTER CONTROL CANL RS MODE SELECTION GND RXD RECEIVER 0.75V WAKE 7.5V AutoShutdown SHDN Figure 4. Functional Diagram 8 _______________________________________________________________________________________ 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers MAX3050/MAX3057 Table 1. Transmitter and Receiver Truth Table TXD 0 1 or float X X RS VRS < 0.75 VCC VRS < 0.75 VCC VRS > 0.75 VCC X SHDN V S HDN > 1.5V V S HDN > 1.5V X V S H D N < 0.5V CANH High Floating Floating CANL Low Floating Floating BUS STATE Dominant* Recessive* Floating Floating RXD 0 1 1 1 5k to 25k to VCC/2 5k to 25k to VCC/2 X = Don't 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. High Speed Connect RS to ground to set the MAX3050/MAX3057 to high-speed mode. When operating in high-speed mode, the MAX3050/MAX3057 can achieve transmission 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/MAX3057 in high-speed mode, use shielded twisted-pair cable to avoid EMI problems. Slope Control Connect a resistor from RS to ground to select slopecontrol mode (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: RRS (k) = 12000/speed (in kbps) See the Slew Rate vs. R RS graph in the Typical Operating Characteristics section. 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 shorted 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 If a logic high level is applied to RS, the MAX3050/ MAX3057 enter a low-current standby mode. In this mode, the transmitter is switched off and the receiver is switched to a low-current state. If dominant bits are detected, RXD switches to a low level. The microcontroller should react to this condition by switching the transceiver back to normal operation (through RS). Due to the reduced power mode, the receiver is slower in standby mode, and the first message may be lost at higher bit rates. Thermal Shutdown If the junction temperature exceeds +160C, the device is switched off. The hysteresis is approximately 20C, disabling thermal shutdown once the temperature reaches +140C. 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 comparator 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 Shutdown (MAX3057) Drive SHDN low to enter shutdown mode. In shutdown mode, the device is switched off. The outputs are high impedance to 80V. The MAX3057 features a pullup at SHDN. If shutdown is forced low and then left floating, the device switches back to normal operating mode. Table 2. Mode Selection Truth Table CONDITION FORCED AT PIN RS VRS < 0.3 VCC 0.4 VCC< VRS < 0.6 VCC VRS > 0.75 VCC MODE High speed Slope control Standby RESULTING CURRENT AT RS |IRs| < 500A 10A < |IRs| < 200A |IRs| < 10A _______________________________________________________________________________________ 9 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers MAX3050/MAX3057 AutoShutdown (MAX3050) To manage power consumption, AutoShutdown puts the device into shutdown mode after the device has been inactive 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. CSHDN(nF) = 0.02 x time(s) (VCC - VSHDN ) Figure 5. FFT Dominant Bus at 2Mbps CANH - CANL 1V/div FFT 500mV/div V SHDN is the threshold of SHDN guaranteed to be less than 2V in the Electrical Characteristics table. 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 normal operation by driving SHDN high. The MAX3057 does not have the AutoShutdown feature. CANH - CANL 1V/div FFT 200mV/div Driver Output Protection The MAX3050/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 transmitter output stage against short-circuits to positive and negative battery voltage. Although the power dissipation increases during this fault condition, this feature prevents destruction of the transmitter output stage. Figure 6. FFT Recessive Bus at 2Mbps CANH - CANL 1V/div FFT 500mV/div Figure 7. FFT Dominant Bus at 500kbps 10 ______________________________________________________________________________________ 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers MAX3050/MAX3057 CANH - CANL 1V/div CANH - CANL 1V/div FFT 200mV/div FFT 200mV/div Figure 8. FFT Recessive Bus at 500kbps Figure 10. FFT Recessive Bus at 62.5kbps Applications Information CANH - CANL 1V/div 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 general, a transmitter's 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 = tRISE / (15ns/ft) FFT 500mV/div Figure 9. FFT Dominant Bus at 62.5kbps where tRISE is the transmitter's rise time. The MAX3050 and MAX3057 require no special layout considerations beyond common practices. Bypass VCC to GND with a 0.1F ceramic capacitor mounted close to the IC with short lead lengths and wide trace widths. Chip Information TRANSISTOR COUNT: 1214 PROCESS: BiCMOS ______________________________________________________________________________________ 11 80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceivers MAX3050/MAX3057 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) SOICN .EPS INCHES DIM A A1 B C e E H L MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MILLIMETERS MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 1.27 N E H VARIATIONS: 1 INCHES MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 D C A e B A1 0 -8 L FRONT VIEW SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, .150" SOIC APPROVAL DOCUMENT CONTROL NO. REV. 21-0041 B 1 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. |
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