General Description
The MAX3054/MAX3055/MAX3056 are interfaces
between the protocol controller and the physical wires
of the bus lines in a controller area network (CAN). The
devices provide differential transmit capability and switch
to single-mode if certain fault conditions occur. The
MAX3054/MAX3055/MAX3056 guarantee full wakeup
capability during failure modes.
The extended fault-protected voltage range of CANH and
CANL bus lines of ±80V. Current-limiting and thermalpro-
tection circuits protect the transmitter output stage against
overcurrent faults to prevent destruction of the transmitter
output stage. The CANH and CANL lines are also protect-
ed against electrical transients that may occur in rugged
environments.
The transceiver provides three low-power modes that
can be entered and exited through pins STB and EN. An
output INH pin can be used for deactivation of an external
voltage regulator.
The MAX3054/MAX3055/MAX3056 are designed to provide
optimal operation for a specified data rate. The MAX3054 is
ideal for high data rates of 250kbps. The MAX3055 is used
for data rates of 125kbps and the MAX3056 is designed for
40kbps applications. For 40kbps and 125kbps versions, a
built-in slope-control feature allows the use of unshielded
cables, and receiver input filters guarantee high noise immunity.
Applications
●Industrial HVAC
Features
●±80V Fault Protection
●Low RFI/Excellent EMC Immunity
●Full Wake-Up Capability During Failure Modes
●Bus Failure Management
●Support Single-Wire Transmission Mode with Ground
Offset Voltages Up to 1.5V
●Thermally Protected
●Do Not Disturb the Bus Line when Unpowered
●Low-Current Sleep and Standby Mode with Wake-Up
Through Bus Lines
●Up to 250kbps Data Rate (MAX3054)
●Pin and Functionally Compatible with TJA1054
19-2687; Rev 1; 9/14
+Lead-free/RoHS-compliant package
PART TEMP RANGE DATA RATE PIN-
PACKAGE
MAX3054ASD+ -40°C to +125°C 250kbps 14 SO
MAX3055ASD+ -40°C to +125°C Slew control
125kbps 14 SO
MAX3056ASD+ -40°C to +125°C Slew control
40kbps 14 SO
TXD RXD STB EN ERR INH
BATTERY
RTH CANH CANL RTL
BATT
GND
VCC
WAKE
+5V
CAN CONTROLLER
2 3 5 6 4 1
8 11 12 9
7
10
13
14
100nF
VBATT +12V
CAN BUS
FAULT
TO 80V
MAX305_
14
13
12
11
10
9
8
1
2
3
4
5
6
7
BATT
GND
CANL
CANHERR
RXD
TXD
INH
TOP VIEW
VCC
RTL
RTHWAKE
EN
STB
SO
MAX3054
MAX3055
MAX3056
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Typical Operating Circuit Pin Conguration
Ordering Information
(All Voltages are Referenced to GND)
Supply Voltage (VCC) ..............................................-0.3V to +6V
Battery Voltage (VBATT) ........................................-0.3V to +80V
TXD, RXD, ERR, STB, EN ....................... -0.3V to (VCC + 0.3V)
CANH, CANL .......................................................... -80V to +80V
RTH, RTL...............................................................-0.3V to +80V
RTH, RTL Current ..........................................................±180mA
WAKE ....................................................................-0.3V to +80V
INH ........................................................-0.3V to (VBATT + 0.3V)
INH Current ......................................................................-0.5mA
Transient Voltage (ISO 7637) ................................ -200V, +200V
Continuous Power Dissipation (TA = +70°C)
14-Pin SO (derate 8.3mW/°C above +70°C) ............... 667mW
Operating Temperature Range ......................... -40°C to +125°C
Junction Temperature ...................................................... +150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
VOLTAGE SUPPLIES
Supply Current ICC
Dominant normal operating mode, no load,
TXD = 0 16 30
mA
Recessive normal operating mode,
TXD = VCC
4 10
Low-power modes:
VTXD = VCC, VBATT = 14V 3 10 µA
Battery Current IBATT
Low-power modes at VTRL = VBATT,
VBATT = VWAKE = VINH = 5V to 27V 5 54 125 µA
Battery Power on Flag Threshold VPWRON Low-power modes 1.0 3.5 V
STB, EN, AND TXD
High-Level Input Voltage VIH 2.4 V
Low-Level Input Voltage VIL 0.8 V
High-Level Input Current IIH VIN = 4V
STB and EN 9 20 µA
TXD -200 -80 -25
Low-Level Input Current IIL VIN = 1V
STB and EN 4 8 µA
TXD -800 -320 -100
Supply Voltage—Forced Standby
Mode (Fail-Safe) VFS VBATT = 14V 2.75 4.50 V
RXD AND ERR
High-Level Output Voltage VOH IOUT = -1mA VCC - 0.5 VCC V
Low-Level Output Voltage VOL IOUT = 7.5mA 0 0.9 V
WAKE
Wake-Up Threshold Voltage VTH(WAKE) VSTB = 0V 2.0 2.7 3.4 V
Low-Level Input Current IIL(WAKE) VWAKE = 0V -10 -4 -1 µA
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
2
Absolute Maximum Ratings
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%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INH
High-Level Voltage Drop ΔVHINH = -0.18mA, standby mode 0.8 V
Leakage Current ILEAK(INH) Sleep mode, VINH = 0V 5 µA
CANH, CANL
Differential Receiver Threshold VDIFF
VCC = 5V, no failures and bus failures 1,
2, 5, 9 -3.5 -3.2 -2.9
V
VCC = 4.75V to 5.25V, no failures and bus
failures 1, 2, 5, 9
-0.70 x
VCC
-0.58 x
VCC
Differential Receiver Hysteresis HYST No failures and bus failures 1, 2, 5, 9 18 mV
CANH Recessive Output Voltage VOCH TXD = VCC, RTH < 4kΩ 200 mV
CANL Recessive Output Voltage VOCL TXD = VCC, RTH < 4kΩ VCC - 0.2 V
CANH Dominant Output Voltage VOCHDOM TXD = 0V, R1 = 100Ω VCC - 1.4 V
CANL Dominant Output Voltage VOCLDOM TXD = 0V, R1 = 100Ω 1.4 V
CANH Output Current IO(CANH)
VCANH = 0V, TXD = 0V -150 -86 mA
Low-power modes, VCANH = 0V, VCC = 5V -10 µA
CANL Output Current IO(CANL)
VCANL = 14V, TXD = 0V 75 130 mA
Low-power modes, VCANL = 42V,
VBATT = 42V, RTL = open 20 µA
Voltage Detection Threshold for
Short Circuit to Battery on CANH VDET(CANH)
VCC = 4.75V to 5.25V 0.30 x
VCC
0.37 x
VCC V
Low-power modes 1.1 2.5
Voltage Detection Threshold for
Short Circuit to GND on CANL VDTG(CANL) Low-power modes 2.5 3.9 V
Voltage Detection Threshold for
Short Circuit to Battery on CANL VDET(CANL) Normal mode, VCC = 5V 6.4 7.3 8.2 V
CANL Wake-Up Threshold VTHL(WAKE) Low-power modes 2.5 3.2 3.9 V
CANH Wake-Up Threshold VTHH(WAKE) Low-power modes 1.1 1.8 2.5 V
CANH Single-Ended Receiver
Threshold (Failures 4, 6, 7) VSE(CANH)
VCC = 5V 1.50 1.70 1.85
V
VCC = 4.75V to 5.25V 0.30 x
VCC
0.37 x
VCC
CANH Single-Ended Receiver
Hysteresis HYST 10 mV
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
3
DC Electrical Characteristics (continued)
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CANL Single-Ended Receiver
Threshold VSE(CANL)
VCC = 5V 3.15 3.30 3.45
V
VCC = 4.75V to 5.25V 0.63 x
VCC
0.69 x
VCC
CANL Single-Ended Receiver
Hysteresis HYST Failures 3, 8 10 mV
RTL AND RTH
RTL to VCC Switch
On-Resistance RSW(RTL) IO = -10mA 36 100 Ω
RTH to VCC Switch
On-Resistance RSW(RTH) IO = 10mA 23 100 Ω
Output Current on Pin RTL IO(RTL) Low-power modes, VRTL = 0 -1.25 -0.65 -0.30 mA
RTL Pullup Current |IPU(RTL)| Normal and failures 4, 6, 7, RTL = 0V 20 107 200 µA
RTH Pulldown |IPU(RTH)| Normal and failures 3, 8, RTL = VCC 20 106 200 µA
THERMAL SHUTDOWN
Shutdown Junction Temperature TJFor shutdown 165 °C
TJF6 During failure 6—switch off CANL only 140
Thermal Protection Hysteresis THYS 15 °C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
TRANSITION TIME
CANL and CANH Bus Output
Transition Time Recessive to
Dominant (10% to 90%)
t(r-d)
CL = 330pF, MAX3054 (250kbps) 38 ns
CL = 220pF to 3.3nF, MAX3055 (125kbps) 100 700
CL = 560pF to 10nF, MAX3056 (40kbps) 0.7 3.3 µs
CANL and CANH Bus Output
Transition Time Dominant to
Recessive (10% to 90%)
t(d-r)
CL = 330pF, MAX3054 (250kbps) 130 ns
CL = 220pF to 1nF, MAX3055 (125kbps) 200 1200
CL = 560pF to 3.3nF, MAX3056 (40kbps) 0.5 2.8 µs
PROPAGATION DELAY TXD TO RXD LOW—DOMINANT TRANSMISSION (FIGURES 1, 2)
Differential Reception tPDLD
No failures, CL = 330pF, MAX3054
(250kbps) 600
ns
Bus failures 1, 2, 5, 9,
CL = 330pF, MAX3054 (250kbps) 750
No failures and bus failures 1, 2, 5, 9,
CL = 1nF, MAX3055 (125kbps) 1.5
µs
No failures and bus failures 1, 2, 5, 9,
CL = 3.3nF, MAX3056 (40kbps) 4.7
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
4
DC Electrical Characteristics (continued)
AC Electrical Characteristics
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Single-Ended Reception tPDLSE
Bus failures 3, 4, 6, 7, 8,
CL = 330pF, MAX3054 (250kbps) 750 ns
Bus failures 3, 4, 6, 7, 8,
CL = 1nF, MAX3055 (125kbps) 1. 5
µs
Bus failures 3, 4, 6, 7, 8,
CL = 3.3nF, MAX3056 (40kbps) 4.7
PROPAGATION DELAY TXD TO RXD HIGH—RECESSIVE TRANSMISSION (FIGURES 1, 2)
Differential Reception tPDHD
No failures and bus failures 1, 2, 5, 9,
CL = 330pF, MAX3054 (250kbps) 950 ns
No failures and bus failures 1, 2, 5, 9,
CL = 1nF, MAX3055 (125kbps) 1.9
µs
No failures and bus failures 1, 2, 5, 9,
CL = 3.3nF, MAX3056 (40kbps) 5.95
Single-Ended Reception tPDHSE
Bus failures 3, 4, 6, 7, 8,
CL = 330pF, MAX3054 (250kbps) 950 ns
Bus failures 3, 4, 6, 7, 8,
CL = 1nF, MAX3055 (125kbps) 1.9
µs
Bus failures 3, 4, 6, 7, 8,
CL = 3.3nF, MAX3056 (40kbps) 5.95
WAKE-UP TIMING
Minimum Time for Wake-Up on
CANL and CANH or WAKE tWAKE WAKE 8 38 µs
FAILURES TIMING
Failures 3 and 8 Detection Time
tDET
Normal and
low-power
mode
MAX3054 (250kbps),
MAX3055 (125kbps) 1.9 5.7 9.5
ms
MAX3056 (40kbps) 5.5 16.5 27.0
Failures 4 and 7 Detection Time
Normal and
low-power
mode
MAX3054 (250kbps),
MAX3055 (125kbps) 0.3 1 1.9
MAX3056 (40kbps) 1.0 3.2 5.5
Failure 6 Detection Time Normal
mode
MAX3054 (250kbps),
MAX3055 (125kbps) 0.35 1.1 1.85
MAX3056 (40kbps) 0.93 2.97 5.00
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
5
AC Electrical Characteristics (continued)
Note 1: All currents into the device are positive; all currents out of the device are negative. All voltages are referenced to device
ground, unless otherwise noted.
Note 2: Failure modes 1 through 9 are explained in Table 1 and in the Detailed Description section.
(VCC = +5V ±5%, VBATT = +5V to +42V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, VBATT = 14V,
R1 = 100Ω, TA = +25°C.) (Notes 1, 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Failures 3 and 8 Recovery Time
tREC
Normal and
low-power
mode
MAX3054 (250kbps),
MAX3055 (125kbps) 0.36 1.14 1.90 ms
MAX3056 (40kbps) 1.0 3.2 5.5
Failures 4 and 7 Recovery Time
Normal
mode
MAX3054 (250kbps) 1.7 5.6 9.5
µsMAX3055 (125kbps) 7 23 38
MAX3056 (40kbps) 22 70 119
Low-power
mode
MAX3054 (250kbps),
MAX3055 (125kbps) 0.35 1.1 1.85 ms
MAX3056 (40kbps) 1.0 3.2 5.5
Failure 6 Recovery Time Normal
mode
MAX3054 (250kbps),
MAX3055 (125kbps) 150 525 900 µs
MAX3056 (40kbps) 390 1445 2500
Minimum Hold Time of
Go-to-Sleep Command tHMIN 5 50 µs
Disable Time of TXD Permanent
Dominant Timer tDIS(TXD) VTXD = 0
MAX3054 (250kbps),
MAX3055 (125kbps) 0.9 4.5 ms
MAX3056 (40kbps) 2.34 12.50
Pulse Count Difference for
Failures 1, 2, 5, 9 Detection (ERR
Becomes Low)
Count
4
Pulse Count Difference for
Failures 1, 2, 5, 9 Recovery (ERR
Becomes High)
3 4 5
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
6
AC Electrical Characteristics (continued)
Figure 1. Timing Diagram for Dynamic Characteristic
Figure 3. Test Circuit for Typical Operating Characteristics
Figure 2. Test Circuit for Dynamic Characteristics
VTXD
VCANL
VCANH
VDIFF
VDIFF = CANH - CANL
VRXD
tPDL tPDH
VCC/2
-5V
-3.2V
2.2V
0
1.4V
3.6V
5V
GND
VCC
+12V
125ΩCL
CL
7
2
1
14
8
12
11
9
10 6 5
4 13 3
+5V
CX = 15pF
PROBE CAP INCLUDED
511Ω
125Ω
511Ω
RTH
CANL
CANH
RTL
WAKE
TXD
INH
BATT
ERR GND RXD
VCC EN STB
CBYPASS
MAX305_
VBATT
R1
R1
CL
CL
7
2
1
14
RTH
CANL
CANH
RTL
TXD
INH
BATT
8
12
11
9
10 6 5
4 13 3
+5V
CX = 15pF
PROBE CAP INCLUDED
VCC EN STB
WAKE
ERR GND RXD
CBYPASS
MAX305_
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
7
Timing Diagrams/Test Circuits
(VCC = +5V, VBATT = 12V, and TA = +25°C. RTL = RTH = 511Ω, R1 = 125Ω, see Test Circuit Figure 3.)
MAX3054
SUPPLY CURRENT vs. DATA RATE
MAX3054/MAX3055/MAX3056 toc02
DATA RATE (kbps)
SUPPLY CURRENT (mA)
45040035030025020015010050
33
34
35
36
37
32
0 500
TA = +125°C
TA = +25°C
TA = -40°C
MAX3055
SUPPLY CURRENT vs. DATA RATE
MAX3054/MAX3055/MAX3056 toc03
DATA RATE (kbps)
SUPPLY CURRENT (mA)
1007550250 125
33
34
35
36
37
32
TA = +125°C
TA = +25°C
TA = -40°C
MAX3056
SUPPLY CURRENT vs. DATA RATE
MAX3054/MAX3055/MAX3056 toc04
DATA RATE (kbps)
SUPPLY CURRENT (mA)
302010
34
35
36
37
38
33
0 40
TA = +125°C
TA = +25°C
TA = -40°C
MAX3054 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3054/MAX3055/MAX3056 toc05
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (ns)
905520-15
250
300
350
400
450
200
-50 125
RECESSIVE
DOMINANT
MAX3055 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3054/MAX3055/MAX3056 toc06
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (ns)
905520-15
300
400
500
600
200
-50 125
RECESSIVE
DOMINANT
MAX3056 RECEIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3054/MAX3055/MAX3056 toc07
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (µs)
905520-15
0.5
1.0
1.5
2.0
0
-50 125
RECESSIVE
DOMINANT
CL = 3.3nF
SLEW RATE vs. TEMPERATURE
RECESSIVE TO DOMINANT
MAX3054/MAX3055/MAX3056 toc01
TEMPERATURE (°C)
SLEW RATE (V/ms)
9259-7 26
5
10
15
20
0
-40 125
MAX3055
MAX3056
MAX3054 DRIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3054/MAX3055/MAX3056 toc08
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (ns)
905520-15
125
150
175
200
100
-50 125
RECESSIVE
DOMINANT
CL = 330pF
MAX3055 DRIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3054/MAX3055/MAX3056 toc09
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY (µs)
905520-15-50 125
CL = 1nF
RECESSIVE
DOMINANT
400
500
600
700
300
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Maxim Integrated
│
8
www.maximintegrated.com
Typical Operating Characteristics
(VCC = +5V, VBATT = 12V, and TA = +25°C. RTL = RTH = 511Ω, R1 = 125Ω, see Test Circuit Figure 3.)
MAX3056 DRIVER PROPAGATION
DELAY vs. TEMPERATURE
MAX3054/MAX3055/MAX3056 toc10
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY (µs)
905520-15-50 125
CL = 3.3nF
RECESSIVE
DOMINANT
2.0
2.5
3.0
3.5
1.5
RECEIVER OUTPUT LOW
vs. OUTPUT CURRENT
MAX3054/MAX3055/MAX3056 toc11
OUTPUT CURRENT (mA)
VOLTAGE RXD (V)
252015105
0.5
1.0
1.5
2.0
2.5
3.0
0
0 30
TA = +125°C
TA = +25°C
TA = -40°C
RECEIVER OUTPUT HIGH
vs. OUTPUT CURRENT
MAX3054/MAX3055/MAX3056 toc12
OUTPUT CURRENT (mA)
VOLTAGE RXD (V)
1512963
0.6
1.2
1.8
2.4
3.0
0
0 18
TA = +125°C
TA = +25°C
TA = -40°C
DIFFERENTIAL VOLTAGE
vs. LOAD RESISTANCE
MAX3054/MAX3055/MAX3056 toc13
LOAD RESISTANCE (Ω)
DIFFERENTIAL VOLTAGE (V)
400300200100
1
2
3
4
5
0
0 500
TA = +25°C TA = +125°C
TA = -40°C
MAX3054
RECEIVER PROPAGATION DELAY
MAX3054/MAX3055/MAX3056 toc14
200ns/div
DIFFERENTIAL
INPUT
5V/div
RXD
5V/div
MAX3055
RECEIVER PROPAGATION DELAY
MAX3054/MAX3055/MAX3056 toc15
400ns/div
DIFFERENTIAL
INPUT
5V/div
RXD
5V/div
MAX3056
RECEIVER PROPAGATION DELAY
MAX3054/MAX3055/MAX3056 toc16
1µs/div
DIFFERENTIAL
INPUT
5V/div
RXD
5V/div
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Maxim Integrated
│
9
www.maximintegrated.com
Typical Operating Characteristics (continued)
(VCC = +5V, VBATT = 12V, and TA = +25°C. RTL = RTH = 511Ω, R1 = 125Ω, see Test Circuit Figure 3.)
DRIVER PROPAGATION DELAY
RECESSIVE TO DOMINANT
MAX3054/MAX3055/MAX3056 toc17
1µs/div
TXD
5V/div
MAX3054
MAX3055
MAX3056
DRIVER PROPAGATION DELAY
DOMINANT TO RECESSIVE
MAX3054/MAX3055/MAX3056 toc18
1µs/div
TXD
5V/div
MAX3056
MAX3055
MAX3054
TXD-TO-RXD PROPAGATION DELAY
DOMINANT TO RECESSIVE
MAX3054/MAX3055/MAX3056 toc19
1µs/div
TXD
MAX3056
MAX3055
MAX3054
TXD-TO-RXD PROPAGATION DELAY
RECESSIVE TO DOMINANT
MAX3054/MAX3055/MAX3056 toc20
1µs/div
TXD
MAX3054
MAX3055
MAX3056
MAX3056 CAN BUS AT 40kbps
MAX3054/MAX3055/MAX3056 toc21
4µs/div
CANH - CANL
5V/div
FFT
1V/div
MAX3055 CAN BUS AT 125kbps
MAX3054/MAX3055/MAX3056 toc22
2µs/div
CANH - CANL
5V/div
FFT
1V/div
MAX3054 CAN BUS AT 250kbps
MAX3054/MAX3055/MAX3056 toc23
400ns/div
CANH - CANL
10V/div
FFT
1V/div
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
Maxim Integrated
│
10
www.maximintegrated.com
Typical Operating Characteristics (continued)
Detailed Description
The MAX3054/MAX3055/MAX3056 interface between
the protocol controller and the physical wires of the bus
lines in a CAN. The devices provide differential transmit
capability and switch to single-wire mode if certain fault
conditions occur (see the Failure Management section).
The MAX3054/MAX3055/MAX3056 guarantee full wake-
up capability during failure modes.
The extended fault-protection range of CANH and CANL
bus lines (±80V). A current-limiting circuit protects the
transmitter output stage against overcurrent faults. This
feature prevents destruction of the transmitter output
stage. If the junction temperature exceeds a value of
approximately +165°C, the transmitter output stages are
disabled. The CANH and CANL lines are also protected
against electrical transients, which can occur in harsh
environments.
The transceiver provides three low-power modes that
can be entered and exited through pins STB and EN. An
output INH pin can be used for deactivation of an external
voltage regulator.
The MAX3054/MAX3055/MAX3056 are designed to pro-
vide optimal operation for a specified data rate. The
MAX3054 is ideal for high data rates of 250kbps. The
MAX3055 is used for data rates of 125kbps and the
MAX3056 is designed for 40kbps applications. For the
40kbps and 125kbps versions, the built-in slope-control
feature allows the use of unshielded cables and receiver
input filters guarantee high noise immunity.
Normal Operation Mode
Transmitter
The transmitter converts a single-ended input (TXD) from
the CAN controller to differential outputs for the bus lines
(CANH, CANL).
Receiver
The receiver takes differential input from the bus lines
(CANH, CANL) and converts this data as a singleended
output (RXD) to the CAN controller. It consists of a com-
parator that senses the difference ΔV = (CANH - CANL)
with respect to an internal threshold.
BATT
The main function of BATT is to supply power to the
device when +12V voltage is supplied.
PIN NAME FUNCTION
1 INH Inhibit Output. Inhibit output is for switching an external voltage regulator if a wake-up signal occurs.
2 TXD Transmit Data Input
3 RXD Receive Data Output
4ERR Error. Wake-up and power-on indication output; active low in normal operating mode when the bus has
a failure and in low-power modes (wake-up signal or power-on standby).
5STB Standby. The digital control signal input (active low) denes, together with input signal on pin EN, the
state of the transceiver (in normal and low-power modes).
6 EN Enable. The digital control signal input denes, together with input signal on pin STB, the state of the
transceiver (in normal and low-power modes).
7WAKE Wake-Up. Local wake-up signal input; falling and rising edges are both detected.
8RTH Termination Resistor. Termination resistor connection for CANH bus.
9RTL Termination Resistor. Termination resistor connection for CANL bus.
10 VCC Supply Voltage. Bypass to ground with a 0.1µF capacitor.
11 CANH High-Level Voltage Bus Line
12 CANL Low-Level Voltage Bus Line
13 GND Ground
14 BATT Battery Supply. Bypass to ground with a 0.1µF capacitor.
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
11
Pin Description
INH
Inhibit is an output that allows for the control of an exter-
nal voltage regulator. On a wake-up request or power-up
on BATT, the transceiver sets the output INH high. This
feature enables the external voltage regulator to be shut
down during sleep mode to reduce power consumption.
INH is floating while entering the sleep mode and stays
floating during the sleep mode. If INH is left floating, it
is not set to a high level again until the following events
occur:
● Power-on (VBATT switching on at cold start)
● Rising or falling edge on WAKE
● Dominant signal longer than 38μs during EN or STB at
low level
The signals on STB and EN are internally set to low level
when VCC is below a certain threshold voltage providing
fail-safe functionality.
After power-on (VBATT switched on) the signal on INH
becomes HIGH and an internal power-on flag is set. This
flag can be read in the power-on standby mode through
ERR (STB = 1, EN = 0) and is reset by entering the nor-
mal operating mode.
ERR
ERR is a wake-up and power-on indicator as well as an
error detector. Upon power-up, wake up, or when a bus
failure is detected, the output signal on ERR becomes
LOW. Upon error recovery, the output signal on ERR is
set HIGH.
STB
STB is the standby digital control signal into the logic
controller. This is an active-low input that is used with EN
to define the status of the transceiver in normal and low-
power modes.
EN
EN is the enable digital control signal into the logic con-
troller used in conjunction with STB to define the status of
the transceiver in normal and low-power modes.
WAKE
WAKE is an input to the logic controller within the device
to signal a wake-up condition. If WAKE receives a positive
or negative pulse for a period longer than tWAKE, wake
up occurs.
Figure 5. Block Diagram
FILTER
FILTER
THERMAL
SHUTDOWN
DRIVER
FAULT DETECTION
WAKE-UP
STANDBY
CONTROLLER
4ms
RECEIVER
IPD
GND
INH
WAKE
STB
EN
TXD
ERR
RXD
1
7
5
6
2
4
3
BATT
10
9
11
12
8
VCC
RTL
CANH
CANL
RTH
MAX305_
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
12
Driver Output Protection
Thermal Shutdown
If the junction temperature exceeds +165°C the driver is
switched off. Thermal hysteresis is 15°C, disabling ther-
mal shutdown once the temperature reaches +150°C.
Overcurrent Protection
A current-limiting circuit 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, this feature prevents destruc-
tion of the transmitter output stage.
Failure Management
The failure detector is fully active in normal operating
mode. After the detection of a single failure the detector
switches to the appropriate state (see Table 1).
The differential receiver threshold voltage is set to -3.2V
typically (VCC = 5V). This ensures correct reception with a
noise margin as high as possible in the normal operating
mode and in the event of failure 1, 2, 5, 9.
If any of the wiring failures occur, the output signal on pin
ERR becomes LOW after detection. On error recovery,
the output signal on pin ERR becomes HIGH.
Table 1. Failure States
Failure 1—CANH Wire Interrupted (Normal Mode Only)
Failure 2—CANL Wire Interrupted (Normal Mode Only)
MODE DESCRIPTION
Detection The external termination resistance connected to the RTH pin provides an instantaneous pulldown of the open CANH
line to GND. Detection is provided, sensing the pulse-count difference between CANH and CANL (pulse count = 4).
Receiver The receiver remains in differential mode. No received data lost.
Driver Driver remains in differential mode. No transmission data lost.
Recovery Recovery is provided sensing the pulse-count difference between CANH and CANL after the detection of four
consecutive pulses.
MODE DESCRIPTION
Detection The external termination resistance connected to the RTL pin provides an instantaneous pullup of the CANL line to
VCC. Detection is provided, sensing the pulse-count difference between CANL and CANH (pulse count = 4).
Receiver The receiver remains in differential mode. No received data lost.
Driver Driver remains in differential mode. No transmission data lost.
Recovery Recovery is provided, sensing the pulse-count difference between CANL and CANH after the detection of four
consecutive pulses.
FAILURE DESCRIPTION MODE
1 CANH wire interrupted Normal
2 CANL wire interrupted Normal
3 CANH short circuited to battery All
4 CANL short circuited to ground All
5 CANH short circuited to ground Normal
6 CANL short circuited to battery Normal
7 CANL mutually short circuited to CANH All
8 CANH short circuited to VCC All
9 CANL short circuited to VCC Normal
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
13
Failure 3—CANH Short-Circuited to Battery
Failure 4—CANL Short-Circuited to GND
Failure 5—CANH Short-Circuited to Ground or Below Ground (Normal Mode Only)
Failure 6—CANL Short-Circuited to Battery (Normal Mode Only)
Failure 7—CANL Mutually Short-Circuited to CANH
Table 1. Failure States (continued)
MODE DESCRIPTION
Detection Sensing a permanent dominant condition on CANH for a timeout period.
Receiver Receiver switches to single ended on CANL.
Driver CANH and RTH are both switched off (high impedance) and transmission continues on CANL after timeout.
Recovery When the short is removed, the recessive bus voltage is restored. If the differential voltage remains below the
recessive threshold level for the timeout period, reception and transmission switch back to the differential mode.
MODE DESCRIPTION
Detection Sensing a permanent dominant condition for a timeout period.
Receiver Receiver switches to single ended on CANH.
Driver CANL and RTL are both switched off (high impedance) and transmission continues on CANH after timeout.
Recovery When the short is removed, the recessive bus voltage is restored. If the differential voltage remains below the
recessive threshold level for the timeout period, reception and transmission switch back to the differential mode.
MODE DESCRIPTION
Detection Detection is provided, sensing the pulse-count difference between CANH and CANL (pulse count = 4).
Receiver Receiver remains in differential mode. No received data lost.
Driver RTH remains on and CANH remains enabled.
Recovery Recovery is provided, sensing the edge-count difference between CANH and CANL after the detection of four
consecutive pulses.
MODE DESCRIPTION
Detection Detected by a comparator for CANL > 7.3V after a timeout period.
Receiver Receiver switches to single ended on CANH after timeout.
Driver RTL is switched off after timeout. CANH remains active.
Recovery Sensing CANL < 7.3V after the timeout period.
MODE DESCRIPTION
Detection Sensing a permanent dominant condition on the differential comparator (CANH - CANL > -3.2V) for the timeout
period.
Receiver Receiver switches to CANH single-ended mode after timeout.
Driver CANL and RTL are both switched off after timeout. Transmission remains ongoing on CANH.
Recovery
When the short is removed, the recessive bus voltage is restored (RTL on if CANH - CANL < -3.2V) but CANL still
remains disabled and ERR = 0. If the differential voltage remains below the recessive threshold level (CANH - CANL
< -3.2V) for the timeout period, reception and transmission switch back to the differential mode.
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
14
Failure 8—CANH Short-Circuited to VCC
Table 1. Failure States (continued)
Failure 9—CANL Short-Circuited to VCC (Normal Mode Only)
Table 2. Summary of the Driver Outputs and Internal Switches State During Fault
Conditions
Note: The RTH-pulldown current switch and the RTL-pullup current switch are closed in normal mode with or without fault conditions,
open in sleep mode.
MODE DESCRIPTION
Detection Sensing a permanent dominant condition on CANH for a timeout period.
Receiver Receiver switches to single ended on CANL. Data lost (permanent dominant) during timeout.
Driver CANH and RTH are both switched off (high impedance) and transmission continues on CANL after timeout. Only a
weak pulldown current on pin RTH remains.
Recovery
When the short is removed (CANH < 1.7V) and after a timeout, CANL is forced recessive (CANL off) and CANH is
enabled (RTH on and CANH enabled). Signal can be transmitted or received in single ended on CANH and ERR
remains low. If the differential voltage remains below the recessive threshold level (CANH - CANL < -3.2V) for a
second timeout, reception and transmission switch back to the differential mode and ERR is released high.
MODE DESCRIPTION
Detection Detection is provided, sensing the pulse-count difference between CANL and CANH (pulse count = 4).
Receiver Receiver remains in differential mode. No received data lost.
Driver Driver remains in differential mode. No transmission data lost.
Recovery Recovery is provided, sensing the pulse-count difference between CANL and CANH after the detection of four
consecutive pulses.
FAILURE NO. DESCRIPTION MODE INTERNAL SWITCHES STATE DRIVER OUTPUTS STATE
CANH CANL
No failure — Normal RTH, RTL on Enabled Enabled
No failure — Low power RTH, I_RTL on Disabled Disabled
1 CANH wire interrupted Normal RTH, RTL on Enabled Enabled
2 CANL wire interrupted Normal RTH, RTL on Enabled Enabled
3 CANH short to BATT All RTH off Disabled Enabled
4 CANL short to GND All RTL or I_RTL off Enabled Disabled
5 CANH short to GND Normal RTH, RTL on Enabled Enabled
6 CANL short to BATT Normal RTL off, RTH on Enabled Enabled
7 CANL short to CANH All RTL or I_RTL off Enabled Disabled
8 CANH short to VCC All RTH off Disabled Enabled
9 CANL short to VCC Normal RTH, RTL on Enabled Enabled
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
15
Note 3: In case the go-to-sleep command was used before.
Note 4: If the supply voltage VCC is present.
Note 5: Wake-up interrupts are released when entering the normal operating mode.
Low-Power Modes
The transceiver provides three low-power modes that can
be entered or exited through pins STB and EN (Table 3).
Sleep Mode
The sleep mode is the mode with the lowest power con-
sumption. INH is switched to high impedance for deacti-
vation of the external voltage regulator. CANL is biased
to the battery voltage through RTL. If the supply voltage
is provided, RXD and ERR signal the wake-up interrupt.
Standby Mode
The standby mode reacts the same as the sleep mode
but with a HIGH level on INH. Standby mode can be used
when the external voltage regulator needs to be kept
active during low-power operation.
Power-On Standby Mode
The power-on standby mode behaves similarly to the
standby mode with the battery power-on flag of the wake-
up interrupt signal on ERR. This mode is only for reading
the power-on flag. INH can be high or low in the power-
on standby mode. When the device goes from standby
mode to power-on standby mode, INH is HIGH. When the
device goes from sleep mode to power-on standby mode,
INH is low.
Wake-Up
Wake-up requests are recognized by the transceiver when
a dominant signal is detected on either bus line or if WAKE
detects a pulse for more than 38μs. On a wake-up request,
INH is set high to activate an external voltage regulator.
If VCC is provided, the wake-up request can be read on
the ERR or RXD outputs.
To prevent false wake-up due to transients or RF fields,
the wake-up voltage levels have to be maintained for more
than 38μs. In the low-power modes, the failure detection
circuit remains partly active to prevent increased power
consumption in the event of failures 3, 4, 7, and 8.
Applications Information
The MAX3054/MAX3055/MAX3056 are capable of sus-
taining a network of up to 32 transceivers on a single bus.
The fault-tolerant transceivers are designed to operate at
a total termination resistance of 100Ω. Both CANH and
CANL lines are terminated with 100Ω. Since the total ter-
mination resistance of the system is distributed over the
entire bus, each of the transceivers contributes only part
of the total 100Ω termination. The values of the termina-
tion resistors RTL and RTH vary according to the size of
the system and need to be calculated. It is not required
that each transceiver be terminated with the same value,
the total termination need only be a total 100Ω.
The minimum termination resistor value allowed for each
transceiver is 500Ω, due to the driving capability of RTH
and RTL. This makes it impossible to achieve a total
termination resistance of 100Ω for systems smaller than
five transceivers. Typically this does not create a prob-
lem because smaller systems usually have shorter bus
cables and have no problem with higher total termination
resistance.
To reduce EMI in the case of an interrupted bus wire it is
recommended not to exceed 6kΩ termination resistance
at a single transceiver even though a higher value is
specified.
Table 3. Low-Power Modes
MODE STB EN
ERR RXD RTL
SWITCHED TO
LOW HIGH LOW HIGH
Go-to-Sleep
Command 0 1 Wake-up
interrupt signal
(Notes 2 and 3)
—
Wake-up
interrupt signal
(Notes 2 and 3)
— VBATT
Sleep 0 0 (Note 1)
Standby 0 0
Power-On
Standby 1 0 VBATT power-on
ag —
Wake-up
interrupt signal
(Notes 2 and 3)
— VBATT
Normal
Operating 1 1 Error ag No error ag Dominant
received data
Recessive
received data VCC
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
16
Reduced EMI and Reections
Due to internal slope control for the MAX3055/MAX3056,
the CANH and CANL outputs are slew-rate limited. This
minimizes EMI and reduces reflections caused by improp-
erly 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 fol-
lowing equation expresses this relationship conservatively:
Length = tRISE/(15ns/ft)
where tRISE is the transmitter’s rise time.
The MAX3054/MAX3055/MAX3056 require no special lay-
out considerations beyond common practices. Bypass VCC
to GND with a 0.1μF ceramic capacitor mounted close to
the IC with short lead lengths and wide trace widths.
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
www.maximintegrated.com Maxim Integrated
│
17
Chip Information
TRANSISTOR COUNT: 1300
PROCESS: BiCMOS
14L SOIC.EPS
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 specications 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.
MAX3054/MAX3055/
MAX3056
±80V Fault-Protected/Tolerant CAN Transceiver
© 2014 Maxim Integrated Products, Inc.
│
18
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.
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.
