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LTC485

sn 485LTC485ffs

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

Low Power RS485

Interface Transceiver

The LTC

ceiver designed for multipoint data transmission standard

RS485 applications with extended common mode range

(12V to – 7V). It also meets the requirements of RS422.

The CMOS design offers significant power savings over its

bipolar counterpart without sacrificing ruggedness against

overload of ESD damage.

The driver and receiver feature three-state outputs, with

the driver outputs maintaining high impedance over the

entire common mode range. Excessive power dissipation

caused by bus contention or faults is prevented by a

thermal shutdown circuit which forces the driver outputs

into a high impedance state.

The receiver has a fail-safe feature which guarantees a

high output state when the inputs are left open.

The LTC485 is fully specified over the commercial and

extended industrial temperature range.

■

■

– 7V to 12V Bus Common Mode Range Permits

±7V Ground Difference Between Devices on the Bus

■

Power-Up/Down Glitch-Free Driver Outputs

Permit Live Insertion or Removal of Transceiver

or with the Power Off

Receiver Allows Up to 32 Transceivers on the Bus

■

70mV Typical Input Hysteresis

with 5ns Skew

■

Pin Compatible with

±60V Protected LT1785 and

52Mbps LTC1685

GND1

R

RO1

RE1

DE1

DI1

D

GND2

R

RO2

RE2

DE2

DI2

D

Rt

Rt

LTC485 • TA01

Driver Outputs

A

B

LTC485 • TA02

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