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19-3500; Rev 0; 11/04
80V Fault-Protected Can Transceiver with Autobaud
General Description
The MAX13051 80V fault-protected CAN transceiver with autobaud is ideal for device net and other industrial network applications where overvoltage protection is required. The MAX13051 provides a link between the CAN protocol controller and the physical wires of the bus lines in a control area network (CAN). The MAX13051 features three different modes of operation: high speed, slope control, and standby. Highspeed mode allows data rates up to 1Mbps. The slope-control mode can be used to program the slew rate of the transmitter for data rates of up to 500kbps, reducing the effects of EMI and allowing the use of unshielded-twisted or parallel cable. In standby mode, the transmitter shuts off and a low-power receiver monitors the bus, waiting for a wake-up signal. The MAX13051 provides a transmitter data (TXD) dominant timeout function that prevents erroneous CAN controllers from clamping the bus to a dominant level if the TXD input is held low for greater than 1ms. The MAX13051 also provides an autobaud feature allowing the microcontroller to compute the incoming baud rate without destroying CAN protocol communication. The MAX13051 input common-mode range is greater than 12V, exceeding the ISO 11898 specification of -2V to +7V, and features 6kV Human Body Model protection, making these devices ideal for harsh environments. The MAX13051 is available in an 8-pin SO package and is specified from the -40C to +85C and -40C to +125C temperature ranges. Autobaud Mode Short-Circuit Protection High-Speed Operation Up to 1Mbps Slope-Control Mode Low-Current Standby Mode Thermal Shutdown Transmit Data Dominant Timeout 6kV Human Body Model ESD Protection Greater than 12V Common-Mode Range
Features
Fully Compatible with the ISO 11898 Standard
MAX13051
Ordering Information
PART MAX13051ESA MAX13051ASA TEMP RANGE -40C to +85C -40C to +125C PIN-PACKAGE 8 SO 8 SO
Applications
Industrial Networks Device Net Nodes Telecom HVAC
0.1F
Typical Operating Circuit
VCC 120
Pin Configuration
TOP VIEW
TXD 1 GND 2 8 7 RS CANH CANL AUTOBAUD
GND CAN CONTROLLER TX0 RX0 I/O I/O 16k TO 200k
VCC
CANH
MAX13051
TXD RXD AUTOBAUD RS GND CANL 120
MAX13051
VCC 3 6 5 RXD 4
SO
________________________________________________________________ Maxim Integrated Products
1
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80V Fault-Protected Can Transceiver with Autobaud MAX13051
ABSOLUTE MAXIMUM RATINGS
(All voltages referenced to GND.) VCC .......................................................................................-0.3V to +6V RS ...............................................................-0.3V to (VCC + 0.3V) TXD, RXD, AUTOBAUD............................................-0.3V to +6V CANH, CANL .......................................................................80V 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 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, TA = +25C.) (Note 1)
PARAMETER Supply Current Standby Current Thermal-Shutdown Threshold Thermal-Shutdown Hysteresis INPUT LEVELS (TXD, AUTOBAUD) High-Level Input Voltage Low-Level Input Voltage High-Level Input Current Low-Level Input Current Input Capacitance CANH, CANL TRANSMITTER Recessive Bus Voltage Recessive Output Current CANH Output Voltage CANL Output Voltage Matching Between CANH and CANL Output Voltage Differential Output (VCANH - VCANL) CANH Short-Circuit Current CANL Short-Circuit Current VCANH, VCANL ICANH, ICANL VCANH VCANL DOM VDIFF ICANHSC ICANLSC Normal mode, VTXD = VCC, no load Standby mode, no load -76V < VCANH, VCANL < +76V -32V < VCANH, VCANL < +32V VTXD = 0, dominant VTXD = 0, dominant VTXD = 0, dominant, TA = +25C (VCANH + VCANL) -VCC Dominant, VTXD = 0, 45 < RL < 60 Recessive, VTXD = VCC, no load VCANH = 0, VTXD = 0 VCANL = 5V, VTXD = 0 VCANL = 40V, VTXD = 0 VCANL = 76V, VTXD = 0 -2.5 3.0 0.50 -100 1.5 -50 -100 40 40 -70 60 60 63 2 -100 3 +2.5 4.5 1.75 +150 3.0 +50 -45 90 90 mA 3 +100 V mV mA V V mV V mV mA VIH VIL IIH IIL CIN VTXD = VCC VAUTOBAUD = VCC VTXD = GND VAUTOBAUD = GND -5 +5 -300 -5 10 2 0.8 +5 +15 -100 +5 V V A A pF SYMBOL ICC ISTANDBY VTSH +165 13 Recessive CONDITIONS Dominant, RL = 60 MIN TYP MAX 72 15 25 UNITS mA A C C
2
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80V Fault-Protected Can Transceiver with Autobaud
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, TA = +25C.) (Note 1)
PARAMETER RXD OUTPUT LEVELS RXD High Output Voltage Level RXD Low Output Voltage Level VOH VOL I = -100A I = 5mA -12V < VCM < +12V -12V < VCM < +12V, standby mode Normal or standby mode, VCANH = VCANL = 12V 0.5 0.5 70 15 -3 Normal or standby mode, VCANH - VCANL = 1V VTXD = VCC VTXD = VCC ILI VIL_RS VIH_RS VSLOPE IIL_RS -200A < IRS < 10A VRS = 0 0.75 x VCC 0.4 x VCC -500 0.6 x VCC VCC = 0, VCANH = VCANL = 5V -5 25 20 10 +5 0.3 x VCC 35 +3 75 0.7 0.8 x VCC VCC 0.4 0.9 1.1 V V SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX13051
DC BUS RECEIVER (VTXD = VCC, CANH and CANL externally driven) Differential Input Voltage Differential Input Hysteresis Common-Mode Input Resistance Matching Between CANH and CANL Common-Mode Input Resistance Differential Input Resistance Common-Mode Input Capacitance Differential Input Capacitance Input Leakage Current SLOPE CONTROL (RS ) Input Voltage for High-Speed Mode Input Voltage for Standby Slope-Control Mode Voltage High-Speed Mode Current V V V A VDIFF V mV k % k pF pF A
VDIFF (HYST) Normal mode, -12V < VCM < +12V RICM RIC_MATCH RDIFF
TIMING CHARACTERISTICS
(VCC = +5V 5%, RL = 60, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.)
PARAMETER Delay TXD to Bus Active Delay TXD to Bus Inactive Delay Bus to Receiver Active Delay Bus to Receiver Inactive Delay TXD to RXD Active Delay TXD to RXD Inactive Delay TXD to RXD Active (Dominant Loop Delay) Slew-Rate Controlled SYMBOL tONTXD tOFFTXD tONRXD tOFFRXD tONLOOP TOFFLOOP tONLOOP_S CONDITIONS VRS = 0 (Figure 1) VRS = 0 (Figure 1) VRS = 0 (Figure 1) VRS = 0 (Figure 1) VRS = 0 (Figure 1) VRS = 0 (Figure 1) RRS = 24k (500kbps) RRS = 100k (125kbps) RRS = 180k (62.5kbps) Delay TXD to RXD Inactive (Loop Delay) Slew-Rate Controlled RRS = 24k (500kbps) tOFFLOOP_S RRS = 100k (125kbps) RRS = 180k (62.5kbps) MIN TYP 66 61 54 46 121 108 280 0.82 1.37 386 0.74 0.97 MAX 110 95 115 160 255 255 450 1.6 5 600 1.6 5 UNITS ns ns ns ns ns ns ns s ns s
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80V Fault-Protected Can Transceiver with Autobaud MAX13051
TIMING CHARACTERISTICS (continued)
(VCC = +5V 5%, RL = 60, CL = 100pF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA = +25C.)
PARAMETER Differential-Output Slew Rate Dominant Time for Wake-Up Through Bus (Figure 2) TXD Dominant Timeout ESD Protection SYMBOL CONDITIONS RRS = 24k (500kbps) RRS = 100k (125kbps) RRS = 180k (62.5kbps) tWAKE tDOM Standby mode, VDIFF = 3V VTXD = 0 Human Body Model (CANH, CANL) 0.75 0.3 MIN TYP 10 2.7 1.6 1.5 0.6 6 3.00 1.0 s ms kV V/s MAX UNITS
|SR|
Note 1: All currents into device are positive and all currents out of the device are negative. All voltages are referenced to device ground unless otherwise noted.
Timing Diagrams
TXD
DOMINANT 0.9V 0.5V VDIFF RECESSIVE
RXD 0.7 x VCC
0.3 x VCC
tONTXD tONRXD tONLOOP
tOFFTXD tOFFRXD tOFFLOOP
Figure 1. Timing Diagram
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80V Fault-Protected Can Transceiver with Autobaud
Timing Diagrams (continued)
STANDBY MODE DOMINANT 0.9V VDIFF
MAX13051
RXD tWAKE
Figure 2. Timing Diagram for Standby and Wake-Up Signal
Typical Operating Characteristics
(VCC = +5V, RL = 60, CL = 100pF, TA = +25C, unless otherwise specified.)
SLEW RATE vs. RRS AT 100kbps
MAX13051 toc01
SUPPLY CURRENT vs. DATA RATE
MAX13051 toc02
STANDBY SUPPLY CURRENT vs. TEMPERATURE (RS = VCC)
19 STANDBY SUPPLY CURRENT (A) 18 17 16 15 14 13 12 11
MAX13051 toc03
30 25 SLEW RATE (V/s) 20 15 10 5 0 0 RECESSIVE DOMINANT
40 TA = +125C
20
35 SUPPLY CURRENT (mA)
30 TA = -40C TA = +25C
25
20
15 0 100 200 300 400 500 600 700 800 900 1000 DATA RATE (kbps) RRS (k)
10 -40 -15 10 35 60 85 TEMPERATURE (C)
20 40 60 80 100 120 140 160 180 200
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80V Fault-Protected Can Transceiver with Autobaud MAX13051
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 60, CL = 100pF, TA = +25C, unless otherwise specified.)
RECEIVER PROPAGATION DELAY vs. TEMPERATURE
MAX13051 toc04
DRIVER PROPAGATION DELAY vs. TEMPERATURE
180 DRIVER PROPAGATION DELAY (ns) 160 140 120 100 80 60 40 20 0 0.2 RECESSIVE 0 -40 -15 10 35 60 85 0 DOMINANT RRS = GND, DATA RATE = 100kbps
MAX13051 toc05
RECEIVER OUTPUT LOW vs. OUTPUT CURRENT
MAX13051 toc06
100 RECEIVER PROPAGATION DELAY (ns) 90 80 70 60 50 40 30 20 10 0 -50 -25 0 25 50 75 100 RECESSIVE RRS = GND, DATA RATE = 100kbps DOMINANT
200
1.4 1.2 VOLTAGE RXD (V) 1.0 0.8 0.6 0.4 TA = +125C TA = +25C
TA = -40C 5 10 15 20
125
TEMPERATURE (C)
TEMPERATURE (C)
OUTPUT CURRENT (mA)
RECEIVER OUTPUT HIGH vs. OUTPUT CURRENT
MAX13051 toc07
DIFFERENTIAL VOLTAGE vs. DIFFERENTIAL LOAD
TA = -40C TA = +125C TA = +25C
MAX13051 toc08
2.0 RECEIVER OUTPUT HIGH (VCC - RXD) (V) 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0 0 1 2 3 4 5 6 7 8 OUTPUT CURRENT (mA) TA = -40C TA = +125C TA = +25C
3.5 3.0 DIFFERENTIAL VOLTAGE (V) 2.5 2.0 1.5 1.0 0.5 0 20 60 100 140 180 220 260
300
DIFFERENTIAL LOAD RL ()
RECEIVER PROPAGATION DELAY
MAX13051 toc09
DRIVER PROPAGATION DELAY, (with RRS = 24k, 75k AND 100k)
MAX13051 toc10
VDIFF (1V/div)
TXD (5V/div) VDIFF (2V/div) RRS = 24k VDIFF (2V/div) RRS = 75k VDIFF (2V/div) RRS = 100k 1.00s
RXD (2V/div)
200ns
6
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80V Fault-Protected Can Transceiver with Autobaud
Typical Operating Characteristics (continued)
(VCC = +5V, RL = 60, CL = 100pF, TA = +25C, unless otherwise specified.)
MAX13051
DRIVER PROPAGATION DELAY, (RRS = GND)
MAX13051 toc11
LOOPBACK PROPAGATION DELAY vs. RRS
TXD (2V/div) LOOPBACK PROPAGATION DELAY (s) 1.2 1.0 0.8 0.6 0.4 0.2 0 DOMINANT RECESSIVE
MAX13051 toc12
1.4
VDIFF (1V/div)
200ns/div
0
20 40 60 80 100 120 140 160 180 200 RRS (k)
Pin Description
PIN 1 2 3 4 5 6 7 8 NAME TXD GND VCC RXD 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. FUNCTION Transmit Data Input. TXD is a CMOS/TTL-compatible input from a CAN controller.
Autobaud Input. Drive AUTOBAUD low for normal operation. Drive AUTOBAUD high for autobaud AUTOBAUD operation. When operating in autobaud mode, TXD is looped back to RXD without applying a differential signal at CANH and CANL. CANL CANH RS CAN Bus Line Low CAN Bus Line High Mode-Select Input. Drive RS low or connect to GND for high-speed operation. Connect a resistor between RS and GND to control output slope. Drive RS high to put into standby mode.
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80V Fault-Protected Can Transceiver with Autobaud MAX13051
VCC
RS VCC
MAX13051
THERMAL SHUTDOWN TIMEOUT AND SLOPECONTROL MODE AUTOBAUD CIRCUITRY WAKE-UP MODE CONTROL CANH CANL
TXD
DRIVER
RXD WAKE-UP FILTER
GND
ENABLE AUTOBAUD
MUX
Figure 3. MAX13051 Functional Diagram
Detail Description
80V Fault Tolerant
The MAX13051 features 80V fault protection. This extended voltage range of CANH and CANL allows communication in high-voltage systems up to 80V.
SR (V / s)
250 RRS
where, SR is the desired slew rate and RRS is in k. Standby Mode In standby mode (RS = high), the transmitter is switched off and the receiver is switched to a low-current/low-speed state. The supply current reduces to 15A to detect and recognize a wake-up event on the bus line. During standby mode, the bus line is monitored with a low-differential comparator. Once the comparator detects a dominant bus level greater than tWAKE, RXD pulls low.
Operating Modes
High-Speed Mode The MAX13051 can achieve transmission rates of up to 1Mbps when operating in high-speed mode. To operate in high-speed mode, short RS to ground. Slope-Control Mode Connect a resistor from RS to ground to select slopecontrol mode (Table 1). In slope-control mode, CANH and CANL slew rates are controlled by the resistor, (16k RRS 200k), connected between RS and GND. Controlling the rise and fall slopes reduces highfrequency EMI and allows the use of an unshieldedtwisted pair or a parallel pair of wires as bus lines. The slew rate can be approximated using the formula below:
Autobaud Mode
The MAX13051 logic-controlled autobaud input allows a microcontroller to compute the incoming baud rate without destroying CAN protocol communication. When operating in autobaud mode, TXD is looped back to RXD without applying a differential signal at CANH and CANL. See Figure 4.
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80V Fault-Protected Can Transceiver with Autobaud MAX13051
Table 1. Mode Selection Truth Table
CONDITION FORCED AT PIN RS VRS 0.3V x VCC 0.4V x VCC < VRS 0.6V x VCC VRS 0.75V x VCC MODE High Speed Slope Control Standby RESULTING CURRENT AT RS 200A |IRS| 500A 10A |IRS| 200A
|IRS| 10A
Table 2. Transmitter and Receiver Truth Table when Not Connected to the Bus
TXD Low High or Float X RS VRS 0.75V x VCC VRS 0.75V x VCC VRS 0.75V x VCC CANH High VCC / 2 RICM GND CANL Low VCC / 2 RICM GND BUS STATE Dominant Recessive Recessive RXD Low High High
*Common-mode input resistance.
TXD TRANSMITTER INPUT RECEIVER OUTPUT
RXD
AUTOBAUD TXD
CANH - CANL
RXD
Figure 4. MAX13051 Autobaud Timing Diagram
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 2. TXD Dominant Timeout The MAX13051 provides a transmitter-dominant timeout that prevents erroneous CAN controllers from clamping the bus to a dominant level by maintaining a continuous low TXD signal. When the TXD remains in the dominant state for greater than 1ms (max), the transmitter becomes disabled, driving the bus line to a recessive state (Figure 5). After a dominant timeout fault, the
MAX13051's transmitter becomes enabled upon detecting a rising edge at TXD.
Receiver
The receiver reads differential inputs 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 DIFF = (CANH - CANL), with respect to an internal threshold of 0.7V. If this difference is positive, (VDIFF > 0.9V), a logic-low is present at RXD. If negative, (VDIFF < 0.5V), a logic-high is present. The receiver always echoes the CAN bus data when not operating in autobaud mode.
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80V Fault-Protected Can Transceiver with Autobaud MAX13051
tDOM TRANSMITTER ENABLED TXD
junction temperature drops below the thermal-shutdown hysteresis, and upon the MAX13051 detecting a rising edge at TXD.
Applications Information
Reduced EMI and Reflections
TRANSMITTER DISABLED
VCANH - VCANL
Figure 5. Transmitter-Dominant Timeout Timing Diagram
The CANH and CANL common-mode range is 12V exceeding the ISO 11898 specification at -2V to +7V. RXD is logic-high when CANH and CANL are shorted or undriven. Driver Output Protection The MAX13051 current-limiting feature protects the transmitter output stage against a short circuit to a positive and negative battery voltage. Although the power dissipation increases during this fault condition, currentlimit protection prevents destruction of the transmitter output stage. Upon removal of a short, the MAX13051 resumes normal operation. Thermal Shutdown If the junction temperature exceeds +165C, the device is switched off. The hysteresis is approximately 13C, disabling thermal shutdown once the temperature drops below 152C. In thermal shutdown, CANH and CANL go recessive. After a thermal-shutdown event, the MAX13051 resumes normal operation when the
In slope-control mode, the CANH and CANL outputs are slew-rate limited, minimizing high-frequency EMI, and reducing reflections caused by improperly terminated cables. In multidrop CAN applications, it is important to maintain a direct point-to-point wiring scheme. A single pair of wires should connect each element of the CAN bus, and the two ends of the bus should be terminated with 120 resistors, see Figure 6. A star configuration should never be used. Any deviation from the point-to-point wiring scheme creates a stub. The high-speed edge of the CAN data on a stub can create reflections back down the bus. These reflections can cause data errors by eroding the noise margin of the system. Although stubs are unavoidable in a multidrop system, care should be taken to keep these stubs as small as possible, especially in high-speed mode. In slope-control mode, the requirements are not as rigorous, but stub length should still be minimized.
Layout Consideration
CANH and CANL are differential signals and steps should be taken to insure equivalent parasitic capacitance. Place the resistor at RS as close as possible to the MAX13051 to minimize any possible noise coupling at the input.
MAX13051
CANH TXD RXD CANL
RL = 120
TWISTED PAIR
RL = 120
TRANSCEIVER 3
STUB LENGTH KEEP AS SHORT AS POSSIBLE
TRANSCEIVER 1
TRANSCEIVER 2
Figure 6. Multiple Receivers Connected to CAN Bus 10 ______________________________________________________________________________________
80V Fault-Protected Can Transceiver with Autobaud MAX13051
RC 1M CHARGE-CURRENTLIMIT RESISTOR HIGHVOLTAGE DC SOURCE RD 1.5k DISCHARGE RESISTANCE DEVICE UNDER TEST IP 100% 90% AMPERES Cs 100pF STORAGE CAPACITOR 36.8% 10% 0 0 tRL TIME tDL CURRENT WAVEFORM Ir PEAK-TO-PEAK RINGING (NOT DRAWN TO SCALE)
Figure 7. Human Body ESD Test Model
Figure 8. Human Body Model Current Waveform
Power Supply and Bypassing
The MAX13051 requires no special layout considerations beyond common practices. Bypass VCC to GND with a 0.1F ceramic capacitor mounted closely to the IC with short lead lengths and wide trace widths.
ESD Test Conditions
ESD performance depends on a number of conditions. Contact Maxim for a reliability report that documents test setup, methodology, and results.
Human Body Model
Figure 7 shows the Human Body Model, and Figure 8 shows the current waveform it generates when discharged into a low impedance. This model consists of a 100pF capacitor charged to the ESD voltage of interest, which is then discharged into the device through a 1.5k resistor.
6kV ESD Protection
ESD protection structures are incorporated on all inputs to protect against ESD encountered during handling and assembly. CANH and CANL inputs have extra protection to protect against static electricity found in normal operation. Maxim's engineers have developed state-of-the-art structures to protect these pins (CANH, CANL) against 6kV ESD without damage. ESD protection can be tested in several ways. The CANH and CANL inputs are characterized for protection to 6kV using the Human Body Model.
Chip Information
TRANSISTOR COUNT: 1400 PROCESS: BiCMOS
______________________________________________________________________________________
11
80V Fault-Protected Can Transceiver with Autobaud MAX13051
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 A e B A1 L C
0-8
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) 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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