1

LT1796

1796f

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

Overvoltage Fault Protected

CAN Transceiver

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

Powered Down

s

Short-Circuit Protection On All Outputs

s

Thermal Shutdown Protection

s

Pin Compatible with Philips PCA82C251

s

Industrial Control Data Networks

s

Automotive Systems

s

HVAC Controls

, LTC and LT are registered trademarks of Linear Technology Corporation.

The LT

ance to survive in industrial and automotive environ-

ments. Discrete protection devices are not needed. Bus

interface pins can withstand voltage faults up to

±60Vwith

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 72

Ω.

The 100k

Ω input impedance allows up to 256 transceivers

per data network.

The LT1796 is available in 8-lead PDIP and SO packages.

Fault Protected CAN Bus Network

120

Ω

1796 TA01

120

Ω

D

LT1796

TXD

5V

RXD

GND

R

0.1

µF

7

1

4

6

5

28

D

LT1796

TXD

5V

RXD

GND

R

0.1

µF

7

1

4

6

5

2

8

125kbps CANH and CANL Driver Output

CANH-CANL

2V/DIV

CANH

2V/DIV

CANL

2V/DIV

TXD IN

5V/DIV

5V/DIV

1796 TA02