SN65LBC031Q
HIGH-SPEED CONTROLLER AREA NETWORK (CAN) TRANSCEIVERS
SLRS048B – MAY 1998 – REVISED MAY 2000
D PACKAGE
(TOP VIEW)
SN65LBC031Q Meets Standard ISO/DIS
11898 (up to 500 k Baud)
Driver Output Capability at 50 mA
TX
ASC
1
2
3
4
8
7
6
5
GND
CANH
CANL
REF
Wide Positive and Negative Input/output
Bus Voltage Range
V
CC
RX
Bus Outputs Short-Circuit-Protected to
Battery Voltage and Ground
TERMINAL FUNCTIONS
DESCRIPTION
Thermal Shutdown
TERMINAL
Available in Q-Temp Automotive
TX
Transmitter input
Ground
– High Reliability Automotive Applications
– Configuration Control/Print Support
– Qualification to Automotive Standards
GND
V
CC
Supply voltage
RX
Receiver output
Reference output
Low side bus output driver
description
REF
CANL
The SN65LBC031Q is a CAN transceiver used as
an interface between a CAN controller and the
physical bus for high speed applications of up to
500 k Baud. The device provides transmit
capability to the differential bus and differential
receive capability to the controller. The transmitter
outputs (CANH and CANL), feature internal
transition regulation to provide controlled
symmetry resulting in low EMI emissions. Both
CANH
ASC
High side bus output driver
Adjustable slope control
FUNCTION TABLE
TX
CANH
CANL BUS STATE RX
L
H
L
Dominant
L
High or floating Floating Floating Recessive
L = low, H = high
H
transmitter outputs are fully protected against battery short circuits and electrical transients that can occur on
the bus lines. In the event of excessive device power dissipation the output drivers are disabled by the thermal
shutdown circuitry at a junction temperature of approximately 160°C. The inclusion of an internal pullup resistor
on the transmitter input ensures a defined output during power up and protocol controller reset. For normal
operation at 500 k Baud the ASC terminal is open or tied to GND. For slower speed operation at 125 k Baud
the bus output transition times can be increased to reduce EMI by connecting the ASC terminal to V . The
CC
receiver includes an integrated filter that suppresses the signal into pulses less than 30 ns wide.
The SN65LBC031Q is characterized for operation over the automotive temperature range of –40°C to 125°C.
logic diagram
V
CC
ASC
TX
R
R
R3
CANH
CANL
R2
R1
R1
2R
2R
REF
RX
R
R
GND
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Copyright 2000, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
1
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