LT1796_15 Datasheet, PDF (1/8 Pages) Linear Technology – Overvoltage Fault Protected CAN Transceiver

LT1796
Overvoltage Fault Protected
CAN Transceiver
FEATURES
s _{Protected from Overvoltage Line Faults to ±60V}
s _{ESD Protection to IEC-1000-4-2 Level 4}
±15kV Air Gap Test
±8kV Contact Mode Test
s _{ISO 11898 Compatible}
s _{High Input Impedance Supports Up to 256 Nodes}
s _{Controlled Slew Rates for EMI Emissions Control}
s _{High Impedance Outputs When Off or}
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s _{Short-Circuit Protection On All Outputs}
s _{Thermal Shutdown Protection}
s _{Pin Compatible with Philips PCA82C251}
U
APPLICATIO S
s _{Industrial Control Data Networks}
s _{Automotive Systems}
s _{HVAC Controls}
DESCRIPTIO
The LT^®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 ±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
±15kV air discharges and ±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 72Ω.
The 100kΩ 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.
TYPICAL APPLICATIO
Fault Protected CAN Bus Network
R_T
120Ω
5V
0.1µF
LT1796
7
1
TXD
D
6
4
RXD
R
5
V_REF
GND R_S
28
R_T
120Ω
5V
125kbps CANH and CANL Driver Output
0.1µF
CANH-CANL
2V/DIV
LT1796
7
1
D
TXD
CANH
2V/DIV
CANL
2V/DIV
6
4
R
RXD
5
V_REF
R_S GND
8
2
1796 TA01
TXD IN
5V/DIV
5V/DIV
1796 TA02
1796f
1