MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers General Description Features 80V Fault Protection for 42V Systems 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 highvoltage power buses. They provide differential transmit capability to the bus and differential receive capability to the CAN controller. 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) The MAX3050 and MAX3057 have four modes of operation: high speed, slope control, standby, and shutdown. Highspeed 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. Automatic Wake-Up from Shutdown (MAX3050) Thermal Shutdown Current Limiting Fully Compatible with the ISO 11898 Standard Ordering Information PART The MAX3050 has an AutoShutdownTM 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. TEMP RANGE PIN-PACKAGE MAX3050ASA -40C to +125C 8 SO MAX3057ASA -40C to +125C 8 SO Pin Configuration TOP VIEW Applications TXD 1 HVAC Controls Telecom 72V systems GND 2 VCC 3 MAX3050 MAX3057 RXD 4 AutoShutdown is a trademark of Maxim Integrated Products, Inc. 8 RS 7 CANH 6 CANL 5 SHDN SO Typical Operating Circuit VCC 120 0.1F VCC CAN CONTROLLER TX0 TXD RX0 RXD 30pF GND 19-2670; Rev 1; 6/14 RS 24k TO 180k CANH MAX3050 MAX3057 CANL (100nF) SHDN GND 120 ( ) ARE FOR 3050 ONLY. MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers Absolute Maximum Ratings VCC to GND ............................................................ -0.3V to +6V TXD, RS, RXD, SHDN to GND....................-0.3V to (VCC + 0.3V) RXD Shorted to GND................................................. Continuous CANH, CANL to GND...........................-80V to +80V 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 MIN Dominant (Note 1) Supply Current IS TYP MAX 56 72 Dominant no load 6 Recessive (Note 1) 3.6 Recessive no load Quiescent Current Standby Mode Shutdown Supply Current IQ IQSHDN 5.5 UNITS mA 5.5 VRS = VCC SHDN = GND 125 260 A 15 30 A Thermal-Shutdown Threshold 160 C Thermal-Shutdown Hysteresis 20 C TXD INPUT LEVELS High-Level Input Voltage VIH Low-Level Input Voltage VIL High-Level Input Current IIH Pullup Resistor 2 V 0.4 VTXD = VCC RINTXD V 1 A 20 k CANH, CANL TRANSMITTER Recessive Bus Voltage Off-State Output Leakage VCANH, VCANL ILO VTXD = VCC, no load 2 3 -2V < VCANH, VCANL < +7V SHDN = GND, VTXD = VCC -2 +1 -80V < VCANH, VCANL < +80V SHDN = GND, VTXD = VCC -4 +4 V mA CANH Output Voltage VCANH VTXD = 0 3.0 VCC V CANL Output Voltage VCANL VTXD = 0 0 2.0 V VTXD = 0 1.5 5 VTXD = 0, RL = 45 1.5 VTXD = VCC, no load -500 -200 Differential Output (VCANH - VCANL) DVCANH, VCANL CANH Short-Circuit Current ISC VCANH = -5V CANL Short-Circuit Current ISC VCANL = 18V ESD CANH, CANL (Note 2) mV mA 200 Human Body Model 2 IEC1000-4-2 Air Gap 3 IEC1000-4-2 Contact Discharge www.maximintegrated.com +50 V mA kV 2.5 Maxim Integrated 2 MAX3050/MAX3057 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 SYMBOL CONDITIONS MIN TYP MAX UNITS DC Bus Receiver (VTXD = VCC; CANH and CANL externally driven; -2V < VCANH, VCANL < +7V, unless otherwise specified) Differential Input Voltage (Recessive) VDIFF -7V < VCANH, VCANL < +12V -1.0 +0.5 V Differential Input Voltage (Dominant) VDIFF -7V < VCANH, VCANL < +12V 0.9 3.3 V Differential Input Hysteresis VDIFF (HYST) CANH Input Wake-Up Voltage Threshold VCANH (SHDN) RXD High-Level Output Voltage VOH RXD Low-Level Output Voltage VOL CANH and CANL Input Resistance Differential Input Resistance 150 SHDN = GND, VTXD = VCC (MAX3050) I = -100A 6 mV 9 0.8 x VCC V V I = 10mA 0.8 I = 5mA 0.4 V RI 5 25 k RDIFF 10 100 k 0.3 x VCC V MODE SELECTION (RS) Input Voltage for High Speed Input Voltage for Standby VSLP 0.75 x VCC VSTBY V Slope-Control Mode Voltage VSLOPE RRS = 24k to 180k 0.4 x VCC 0.6 x VCC V Slope-Control Mode Current ISLOPE RRS = 24k to 180k -10 -200 A Standby Mode High-Speed Mode Current ISTBY IHS -10 VRS = 0 +10 A -500 A 900 k SHUTDOWN SHDN Input Pullup Resistor SHDN Input Voltage High www.maximintegrated.com RINSHDN MAX3057 500 2 V Maxim Integrated 3 MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers 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 SYMBOL CONDITIONS MIN TYP MAX UNITS TIMING VRS = 0 (2Mbps) Minimum Bit Time tBIT 0.5 RRS = 24k (500kbps) 2 RRS = 100k (125kbps) 8 RRS = 180k (62.5kbps) 25 s Delay TXD to Bus Active tONTXD VRS = 0 40 ns Delay TXD to Bus Inactive tOFFTXD VRS = 0 75 ns VRS = 0 (2Mbps) 120 ns RRS = 24k (500kbps) 0.4 RRS = 100k (125kbps) 1.6 Delay TXD to Receiver Active Delay TXD to Receiver Inactive Differential Output Slew Rate tONRXD tOFFRXD SR Bus Dominant to RXD Low RRS = 180k (62.5kbps) 5.0 VRS = 0 (2Mbps) 130 RRS = 24k (500kbps) 0.45 RRS = 100k (125kbps) 1.6 RRS = 180k (62.5kbps) 5.0 RRS = 24k (500kbps) 14 RRS = 100k (125kbps) 7 RRS = 180k (62.5kbps) 1.6 s ns s V/s Standby mode 10 s Time to Wake Up: CANH > 9V tWAKE SHDN = GND, VTXD = VCC (MAX3050) 10 s Time to Sleep Mode when Bus Is Recessive tSHDN CSHDN = 100nF (MAX3050) 47 ms 10 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. www.maximintegrated.com Maxim Integrated 4 MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers 120 VCC 0.1F VCC CAN CONTROLLER CANH MAX3050 MAX3057 TX0 TXD RX0 RXD CANL (100nF) SHDN 30pF RS GND 100pF GND 24k TO 180k 120 ( ) ARE FOR MAX3050 ONLY. Figure 1. AC Test Circuit TXD 9V CANH CANH CANL DOMINANT VSHDN = 2V 0.9V CANH - CANL RXD 0.5V RECESSIVE VCC/2 VCC/2 tONTXD tOFFTXD tONRXD tOFFRXD Figure 2. Timing Diagram for Dynamic Characteristics www.maximintegrated.com VSHDN tWAKE Figure 3. Time to Wake-Up (tWAKE) (MAX3050) Maxim Integrated 5 MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers Typical Operating Characteristics (VCC = 5V, RL = 60, CL = 100pF, TA = +25C, unless otherwise specified.) TA = +25C TA = -+125C 5 86 162 MAX3050 toc02 27 100 0 200 300 0 400 800 1200 1600 -15 20 55 90 VOLTAGE RXD (mV) 30 RECESSIVE 25 DOMINANT 20 TA = +125C 1200 800 TA = +25C 400 TA = -40C 15 125 1600 MAX3050 toc05 35 2000 MAX3050 toc06 RECEIVER OUTPUT LOW vs. OUTPUT CURRENT DOMINANT -40 -7 26 59 92 0 125 0 5 10 15 20 25 TEMPERATURE (C) OUTPUT CURRENT (mA) RECEIVER OUTPUT HIGH vs. OUTPUT CURRENT DIFFERENTIAL VOLTAGE vs. DIFFERENTIAL LOAD RL SUPPLY CURRENT vs. TEMPERATURE IN STANDBY MODE TA = +25C 600 TA = +125C 2 TA = +25C 1 10 15 OUTPUT CURRENT (mA) www.maximintegrated.com 20 150 125 100 75 TA = -40C 5 175 SUPPLY CURRENT (A) 1800 TA = -40C 3 200 MAX3050 toc08 TA = +125C 4 MAX3050 toc09 TEMPERATURE (C) 2400 0 25 400 TA = -40C DRIVER PROPAGATION DELAY vs. TEMPERATURE, RRS = GND 25 0 29 RECEIVER PROPAGATION DELAY vs. TEMPERATURE, RRS = GND 35 1200 TA = +25C TA = +125C DATA RATE (kbps) RECESSIVE 3000 31 CSHDN (nF) 45 -50 0 200 33 RRS (k) 55 15 VOLTAGE RXD (mV) 124 MAX3050 toc04 RECEIVER PROPAGATION DELAY (ns) 65 48 DRIVER PROPAGATION DELAY (ns) 10 40 20 DIFFERENTIAL VOLTAGE (V) 0 60 SUPPLY CURRENT vs. DATA RATE 35 SUPPLY CURRENT (mA) 15 10 80 SLEEP TIME (ms) TA = -40C MAX3050 toc07 SLEW RATE (V/s) 20 AUTOSHUTDOWN VS. CSHDN 100 MAX3050 toc01 25 MAX3050 toc03 SLEW RATE vs. RRS MAX3057 25 0 0 50 100 150 200 250 DIFFERENTIAL LOAD RL () 300 50 -50 -15 20 55 90 125 TEMPERATURE (C) Maxim Integrated 6 MAX3050/MAX3057 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 RECEIVER PROPAGATION DELAY MAX3050 toc11 MAX3050 toc10 LOOPBACK PROPAGATION DELAY (ns) 1400 1200 CANH - CANL 1000 800 600 RXD 2V/div 400 200 0 50 0 100 150 200 40ns/div RRS (k) DRIVER PROPAGATION DELAY DRIVER PROPAGATION DELAY MAX3050 toc12 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 NAME 1 TXD Transmit Data Input. TXD is a CMOS/TTL-compatible input from a CAN controller. FUNCTION 2 GND Ground 3 VCC Supply Voltage. Bypass VCC 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. www.maximintegrated.com Maxim Integrated 7 MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers Detailed Description 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. 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 capability to the bus and differential receive capability to the CAN controller. (See Figure 4.) 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 protection. 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. 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. 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 MAX3057 THERMAL SHUTDOWN CANH TRANSMITTER CONTROL TXD RS CANL MODE SELECTION GND RXD RECEIVER 0.75V WAKE 7.5V AUTO SHUTDOWN SHDN Figure 4. Functional Diagram www.maximintegrated.com Maxim Integrated 8 MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers Table 1. Transmitter and Receiver Truth Table TXD RS SHDN CANH CANL BUS STATE RXD 0 VRS < 0.75 x VCC V SHDN > 1.5V High Low Dominant* 0 1 or float VRS < 0.75 x VCC V SHDN > 1.5V 5 to 25k to VCC/2 5 to 25k to VCC/2 Recessive* 1 X VRS > 0.75 x VCC X Floating Floating Floating 1 X X V SHDN < 0.5V Floating Floating Floating 1 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 and MAX3057 to high-speed mode. When operating in high-speed mode, the MAX3050 and 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 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 slopecontrol 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: RRS (k) = 12000/speed (in kbps). 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 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 The MAX3050 and MAX3057 transmitters are threestated, and the receivers are active in standby. This allows the device to read data on the bus while reducing power consumption. See the Slew Rate vs. RRS graph in the Typical Operating Characteristics section. 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. Shutdown Thermal Shutdown 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 remains in shutdown until SHDN is forced high. If the junction temperature exceeds +160C, the device is switched off. The hysteresis is approximately 20C, disabling thermal shutdown once the temperature reaches +140C. Table 2. Mode Selection Truth Table CONDITION FORCED AT PIN RS MODE RESULTING CURRENT AT RS VRS < 0.3 x VCC High speed |IRs| < 500A 0.4 x VCC < VRS < 0.6 VCC Slope control 10A < |IRs| < 200A VRS > 0.75 x VCC Standby |IRs| < 10A www.maximintegrated.com Maxim Integrated 9 MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers 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 (CSHDN) 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. CANH - CANL 1V/div Use a 100nF capacitor as CSHDN for a typical threshold of 20ms. Change the capacitor value according to the following equation to change the threshold time period. I (mA)x time(s) C SHDN (nF) = SHDN (VCC - V SHDN ) FFT 500mV/div Figure 5. FFT Dominant Bus at 2Mbpslayout. Drive SHDN high to turn the MAX3050 on and disable AutoShutdown. When the MAX3050 is in shutdown mode, only the wakeup 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. CANH - CANL 1V/div 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. FFT 200mV/div Figure 6. FFT Recessive Bus at 2Mbps Additionally, a current-limiting circuit protects the transmitter 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. CANH - CANL 1V/div Applications Information Reduced EMI and Reflections In slope-control mode, the CANH and CANL outputs are slew-rate limited, minimizing EMI and reducing reflections caused by improperly terminated cables. In 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: FFT 500mV/div Figure 7. FFT Dominant Bus at 500kbps Length = tRISE / (15ns/ft) where tRISE is the transmitter's rise time. www.maximintegrated.com Maxim Integrated 10 MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers 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 CANH - CANL 1V/div The MAX3050 and MAX3057 require no special layout considerations beyond common practices. Bypass VCC to GND with a 1F ceramic capacitor mounted close to the IC with short lead lengths and wide trace widths. Chip Information TRANSISTOR COUNT: 1214 PROCESS: BiCMOS FFT 500mV/div Figure 9. FFT Dominant Bus at 62.5kbps 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. www.maximintegrated.com PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 8 SOIC S8+5 21-0041 90-0096 Maxim Integrated 11 MAX3050/MAX3057 80V Fault-Protected, 2Mbps, Low-Supply Current CAN Transceivers Revision History REVISION NUMBER REVISION DATE 0 10/02 Initial release 1 6/14 Removed automotive references DESCRIPTION PAGES CHANGED -- 1, 8 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. 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 specifications 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. (c) 2014 Maxim Integrated Products, Inc. 12 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX3050ASA+ MAX3057ASA+ MAX3050ASA+T MAX3057ASA+T