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19-2425; Rev 0; 4/02
80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver
General Description
The MAX3053 interfaces between the control area network (CAN) protocol controller and the physical wires of the bus lines in a CAN. It is primarily intended for industrial systems requiring data rates up to 2Mbps and features 80V fault protection against shorts to high-voltage power buses. The device provides differential transmit capability to the bus and differential receive capability to the CAN controller. The MAX3053 has three different modes of operation: high-speed, slope control, and shutdown. High-speed mode allows data rates up to 2Mbps. In slope control mode, data rates are between 40kbps and 500kbps so the effects of EMI are reduced and unshielded twisted or parallel cable may be used. In shutdown mode, the transmitter is switched off, and the receiver is switched to a low-current mode. An autoshutdown function puts the device in 15A shutdown mode when the bus or CAN controller is inactive for 47ms or greater. The MAX3053 is available in an 8-pin SO package and is specified for -40C to +125C operation. o 80V Fault Protection o Three Operating Modes High-Speed Operation up to 2Mbps Slope Control Mode to Reduce EMI (40kbps to 500kbps) o 15A Low-Current Shutdown Mode o Autoshutdown when Device Is Inactive o Automatic Wakeup from Shutdown o Thermal Shutdown o Current Limiting o Fully Compatible with the ISO 11898 Standard
Features
MAX3053
Ordering Information
PART MAX3053ESA MAX3053ASA TEMP RANGE -40C to +85C -40C to +125C PIN-PACKAGE 8 SO 8 SO
Applications
Industrial Control and Networks Printers Automotive Systems HVAC Controls Telecom 72V Systems
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
VCC 120 100nF
VCC CANH CAN CONTROLLER TXD TXD
MAX3053
CANL 100nF SHDN 120 GND
RXD
RXD
GND 25k TO 180k
RS
________________________________________________________________ Maxim Integrated Products
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80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver MAX3053
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 8-Pin SO (derate 5.9mW/C above +70C) .................470mW Operating Temperature Ranges MAX3053ASA ...............................................-40C to +125C MAX3053ESA .................................................-40C to +85C 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, unless otherwise noted. 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) 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 Human Body Model ESD CANH, CANL (Note 2) IEC1000-4-2 Air-Gap Discharge IEC1000-4-2 Contact Discharge 2 3 2.5 kV 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 0.4 V V A k IQSHDN SHDN = GND 15 160 20 3.6 MIN TYP 56 MAX 72 6 5.5 5.5 30 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
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80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V 10%, RL = 60, RS = GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.)
PARAMETER Differential Input Voltage (Recessive) Differential Input Voltage (Dominant) Differential Input Hysteresis CANH Input Wakeup Voltage Threshold RXD High-Level Output Voltage RXD Low-Level Output Voltage CANH and CANL Input Resistance Differential Input Resistance SLOPE CONTROL Input Voltage for High Speed Slope Control Mode Voltage Slope Control Mode Current High-Speed Mode Current AUTOSHUTDOWN SHDN Input Voltage High SHDN Input Voltage Low 2 0.5 V V VSLP VSLOPE ISLOPE IHS RRS = 24k to 180k RRS = 24k to 180k, VCC = +5.0V VRS = 0 0.4 x VCC -10 0.3 x VCC 0.6 x VCC -200 -500 V V A A SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX3053
DC BUS RECEIVER (VTXD = VCC; CANH and CANL externally driven (-2V < VCANH, VCANL < +7V, unless otherwise specified) VDIFF VDIFF VDIFF(HYST) VCANH(SHDN) SHDN = GND, VTXD = VCC VOH VOL RI RDIFF I = -100A I = 10mA I = 5mA 5 10 6 0.8 x VCC 0.8 0.4 25 100 -7V < VCANH, VCANL < +12V -7V < VCANH, VCANL < +12V -1.0 0.9 150 9 +0.5 3.3 V V mV V V V k k
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80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver MAX3053
TIMING CHARACTERISTICS
(VCC = +5V 10%, RL = 60, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.) (Figures 1, 2, and 3)
PARAMETER SYMBOL CONDITIONS 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 Time to Wakeup: CANH > 9V Time to Sleep Mode when Bus Is Recessive |SR| tWAKE tSHDN RRS = 100k (125kbps) RRS = 180k (62.5kbps) SHDN = GND, VTXD = VCC CSHDN = 100nF 10 14 7 1.6 10 47 s ms V/s MIN 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 TYP MAX UNITS
Note 1: As defined by ISOSHDN, 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 MAX3053 values, see the truth table in the Transmitter and Receiver sections. Note 2: The ESD structures do not short out CANH and CANL under an ESD event while -7V < CANH, CANL < +12V.
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80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver
Typical Operating Characteristics
(VCC = +5V, RL = 60, CL = 100pF, TA = +25C, unless otherwise specified.)
MAX3053
SLEW RATE vs. RRS
MAX3053 toc01
MAX3053 toc02
70 60 50 40 30 20
20 SLEW RATE (V/s)
28 SUPPLY CURRENT (mA)
TA = -40C
15 TA = -40C 10 TA = +25C
SLEEP TIME (ms)
26 TA = +25C 24
TA = +125C
5 TA = +125C 0 20 65 110 RRS (k) 155 200
22 10 0 0 50 100 150 200 250 300 350 400 CSHDN (nF) 20 0 500 1000 DATA RATE (kbps) 1500 2000
RECEIVER PROPAGATION DELAY vs. TEMPERATURE (RECESSIVE TO DOMINANT)
MAX3053 toc04
DRIVER PROPAGATION DELAY vs. TEMPERATURE, RRS = GND
MAX3053 toc05
RECEIVER OUTPUT LOW vs. OUTPUT CURRENT
MAX3053 toc06
40 RECEIVER PROPAGATION DELAY (ns)
35 DRIVER PROPAGATION DELAY (ns)
1600
35
30
30
VOLTAGE RXD (mV)
RECESSIVE
1200
TA = +25C TA = +125C
25 DOMINANT 20
800
25
20
400 TA = -40C
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
MAX3053 toc07
DIFFERENTIAL VOLTAGE (CANH - CANL) vs. DIFFERENTIAL LOAD RL
MAX3053 toc08
RECEIVER PROPAGATION DELAY (DOMINANT TO RECESSIVE)
MAX3053 toc09
3.0
5
TA = +25C VOLTAGE RXD (V) 1.8 TA = +125C 1.2
DIFFERENTIAL VOLTAGE (V)
2.4
4
TA = -40C
MAX3053 toc03
25
80
AUTOSHUTDOWN vs. CSHDN
30
SUPPLY CURRENT vs. DATA RATE 50% DUTY CYCLE
3 TA = +125C TA = +25C
2V/div
DIFFERENTIAL INPUT
2
0.6 TA = -40C 0 0 5 10 15 20 25 OUTPUT CURRENT (mA)
1
0 0 50 100 150 200 250 300
40ns/div
DIFFERENTIAL LOAD RL ()
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80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver MAX3053
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 60, CL = 100pF, TA = +25C, unless otherwise specified.) DRIVER PROPAGATION DELAY
MAX3053 toc10
DRIVER PROPAGATION DELAY
MAX3053 toc11
TXD
TXD
5V/div
2V/div
RRS = 24k RRS = 100k
RRS = GND CANH - CANL CANH - CANL 40ns/div 400ns/div
RRS = 180k 1V/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 the MAX3053 in shutdown mode. See the Detailed Description section 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. 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 Transceiver
Test Circuits/Timing Diagrams
VCC 0.1F 120
MAX3053
VCC CANH TXD CAN CONTROLLER RXD 30pF RS 24k TO 180k TXD
MAX3053
CANL 100nF SHDN GND 120
RXD
Figure 1. AC Test Circuit
TXD
CANH 9V CANL
DOMINANT
CANH 0.9V VSHDN = 2V VSHDN tWAKE
CANH-CANL
0.5V
RECESSIVE
RXD tONTXD tONRXD
VCC/2
VCC/2 tOFFTXD tOFFRXD
Figure 2. Timing Diagram for Dynamic Characteristics
Figure 3. Time to Wakeup (twake)
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80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver MAX3053
Detailed Description
The MAX3053 interfaces between the protocol controller and the physical wires of a CAN bus. It is primarily intended for industrial applications requiring data rates up to 2Mbps and features 80V fault protection against shorts in high-voltage systems. This fault protection allows the device 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 device provides differential transmit capability to the bus and differential receive capability to the CAN controller (Figure 4). The device has three modes of operations: high-speed, slope control, and shutdown. In high-speed mode, slew rates are not limited, making 2Mbps transmission speeds possible. Slew rates are controlled in slope control mode, minimizing EMI and allowing use of unshielded twisted or parallel cable. The device goes into low-power operation in shutdown mode. The transceiver is designed to operate from a single +5V supply, and draws 56mA of supply current in dominant state and 3.6mA in recessive state. In shutdown mode, supply current is reduced to 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 MAX3053 features 80V fault protection. This extended voltage range of CANH and CANL bus lines allows its use in high-voltage systems and communicating to 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). Table 1 is the truth table for the transmitter and receiver. High Speed Connect RS to ground to set the MAX3053 to highspeed mode. When operating in high-speed mode, the MAX3053 can achieve transmission rates 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 MAX3053 in high-speed mode, use shielded twisted-pair cable to avoid EMI problems.
VCC
THERMAL SHUTDOWN
MAX3053
CANH TXD TRANSMITTER CONTROL CANL
RS
MODE SELECTION
GND RXD RECEIVER
0.75V WAKE 7.5V AUTOSHUTDOWN SHDN
Figure 4. Block Diagram 8 _______________________________________________________________________________________
80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver MAX3053
Table 1. Transmitter and Receiver Truth Table
TXD 0 1 or float X* SHDN V SHDN > 1.5V V SHDN > 1.5V V SHDN < 0.5V CANH HIGH 5 to 25k to Vcc/2 Floating CANL LOW 5 to 25k to Vcc/2 Floating BUS STATE Dominant** Recessive** Floating RXD 0 1 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.
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: RRS (k) = 12000 / speed (in kbps). See the Typical Operating Characteristics for the Slew Rate vs. RRS graph. Shutdown To place the MAX3053 in shutdown, the SHDN pin should be driven to GND. In shutdown mode, the device is switched off. The outputs are high impedance to 80V.
Table 2. Mode Selection Truth Table
CONDITION FORCED AT PIN RS VRS < 0.3VCC 0.4VCC < VRS < 0.6VCC MODE High speed Slope control RESULTING CURRENT AT RS |IRs| < 500A 10A < |IRs| < 200A
Autoshutdown
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 (CSHDN) connected to SHDN determines the threshold of inactivity time, after which the autoshutdown triggers (see Typical Operating Characteristics). 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 (A) x time (ms) C SHDN (nf ) = SHDN (VCC SHDN (V)) -V Drive SHDN high to force the MAX3053 on and disable autoshutdown. When the MAX3053 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 MAX3053 with a signal greater than 9V on CANH. The local CAN controller wakes up the MAX3053 by driving SHDN high or TXD.
Receiver
The receiver takes differential input from the bus lines (CANH, CANL) and converts this data to 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 > 0.9V), a logic low is present at the RXD pin. If negative (i.e., V < 0.5V), a logic high is present. The receiver always echoes the transmitted data. The CANH and CANL common-mode range is from -7V to +12V. RXD is logic high when CANH and CANL are shorted or terminated and undriven.
Driver Output Protection
The MAX3053 has several features to protect itself 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 about 20C.
Thermal Shutdown
If the junction temperature exceeds +160C, the device is switched off. The hysteresis is about 20C, disabling thermal shutdown once the temperature declines to +140C and the device is turned back on.
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80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver MAX3053
Additionally, a current-limiting circuit protects the transmitter output stage against a 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. length of an unterminated stub, which can be driven with only minor waveform reflections. The following equation expresses this relationship conservatively: Length = tRISE / (10 x 1.5ns/ft) where tRISE is the transmitter's rise time. See Figures 5, 6, and 7 for typical waveforms at various data rates. The MAX3053 requires 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.
Applications Information
Reduced EMI and Reflections
In slope control mode, the CANH, 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
CANH-CANL 5V/div CANH-CANL 5V/div
FFT 200mV/div 4.00s 31.5kHz RRS = 180k 250kHz RRS = 24k 400ns
FFT 200mV/div
Figure 5. Output Bus in Slope Control Mode at 62.5kbps
Figure 6. Output Bus in Slope Control Mode at 500kbps
Pin Configuration
TOP VIEW
CANH-CANL 5V/div TXD GND VCC RXD 1 2 3 4 8 RS CANH CANL SHDN
MAX3053
7 6 5
SO
FFT 200mV/div 100ns 1MHz RRS = 0
Chip Information
TRANSISTOR COUNT: 1214 PROCESS: BiCMOS
Figure 7. Output Bus High-Speed Mode at 2Mbps
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80V Fault-Protected, 2Mbps, Low Supply Current CAN Transceiver
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.)
MAX3053
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
9LUCSP, 3x3.EPS

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