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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
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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
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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
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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.
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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)
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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)
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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.
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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
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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
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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
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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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