1

LTC488/LTC489

Quad RS485 Line Receiver

S

FEATURE

s

s

Designed for RS485 or RS422 Applications

s

Single 5V Supply

s

– 7V to 12V Bus Common Mode Range Permits

±7V

Ground Difference Between Devices on the Bus

s

60mV Typical Input Hysteresis

s

Receiver Maintains High Impedance in Three-State or

with the Power Off

s

28ns Typical Receiver Propagation Delay

s

Pin Compatible with the SN75173 (LTC488)

s

Pin Compatible with the SN75175 (LTC489)

S

APPLICATI

s

Low Power RS485/RS422 Receivers

s

Level Translator

The LTC

line receivers designed for multipoint data transmission

standard RS485 applications with extended common mode

range (12V to – 7V). They also meet the requirements of

RS422.

The CMOS design offers significant power savings over its

bipolar counterpart without sacrificing ruggedness against

overload or ESD damage.

The receiver features three-state outputs, with the receiver

output maintaining high impedance over the entire com-

mon mode range.

The receiver has a fail-safe feature which guarantees a

high output state when the inputs are left open.

Both AC and DC specifications are guaranteed 4.75V to

5.25V supply voltage range.

DESCRIPTIO

APPLICATI

TYPICAL

120

Ω

4000 FT 24 GAUGE TWISTED PAIR

DI

RECEIVER

1/4 LTC488

120

Ω

DRIVER

1/4 LTC486

RO

EN

EN

1

2

4

12

3

EN

EN

120

Ω

4000 FT 24 GAUGE TWISTED PAIR

DI

RECEIVER

1/4 LTC489

120

Ω

DRIVER

1/4 LTC487

RO

EN12

1

2

4

3

EN12

LTC488/9 TA01

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