LT1796
Overvoltage Fault Protected
CAN Transceiver
FEATURES
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DESCRIPTIO
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Protected from Overvoltage Line Faults to
鹵60V
ESD Protection to IEC-1000-4-2 Level 4
鹵15kV
Air Gap Test
鹵8kV
Contact Mode Test
ISO 11898 Compatible
High Input Impedance Supports Up to 256 Nodes
Controlled Slew Rates for EMI Emissions Control
High Impedance Outputs When Off or
Powered Down
Short-Circuit Protection On All Outputs
Thermal Shutdown Protection
Pin Compatible with Philips PCA82C251
The LT
廬
1796 CAN transceiver provides built-in fault toler-
ance to survive in industrial and automotive environ-
ments. Discrete protection devices are not needed. Bus
interface pins can withstand voltage faults up to
鹵60V
with
respect to ground with no damage to the device. Faults
may occur while the transceiver is active, shut down or
powered off. On-chip ESD protection withstands up to
鹵15kV
air discharges and
鹵8kV
contact mode discharges
tested per IEC-1000-4-2. Loss of power or ground con-
nections does not damage the IC.
The circuit operates with data rates up to 125kbaud. A slew
control pin allows control of transmitted data pulse edges
to control EMI and reflection problems on imperfectly
terminated lines. High output current drive allows the use
of inexpensive PVC cable with impedance as low as 72鈩?
The 100k鈩?input impedance allows up to 256 transceivers
per data network.
The LT1796 is available in 8-lead PDIP and SO packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
APPLICATIO S
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Industrial Control Data Networks
Automotive Systems
HVAC Controls
TYPICAL APPLICATIO
R
T
120鈩?/div>
5V
0.1碌F
Fault Protected CAN Bus Network
R
T
120鈩?/div>
5V
0.1碌F
125kbps CANH and CANL Driver Output
CANH-CANL
2V/DIV
LT1796
7
TXD
1
D
6
RXD
4
R
V
REF
GND
2
R
S
8
5
5
6
7
LT1796
D
1
TXD
CANH
2V/DIV
CANL
2V/DIV
TXD IN
5V/DIV
5V/DIV
1796 TA02
R
V
REF
R
S
8
GND
2
4
RXD
1796 TA01
U
1796f
U
U
1
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