1

LTC1518/LTC1519

52Mbps Precision Delay

RS485 Quad Line Receivers

100

Ω

A 1

4

EN

EN

RO

1518/19 F08

1/4 LTC1518

LTC1685

LTC1685

12

3

2 B

7

6

3

2

DE

DI

RO

4

1

100

Ω

7

6

3

2

DE

DI

RO

4

1

RE

RE

s

Precision Propagation Delay: 18.5ns

±3.5ns Over

Temperature

s

High Data Rate:

52Mbps

s

s

Low Channel-to-Channel Skew: 500ps Typ

s

–7V to 12V RS485 Input Common Mode Range

s

Input Resistance

≥22k, Even When Unpowered

s

Guaranteed Fail-Safe Operation over the Entire

Common Mode Range

s

Hot Swap

s

High Common Mode Rejection to 26MHz

s

Short-Circuit Protection: 10mA Typ Output Current

for an Indefinite Short

s

Three-State Output Capability

s

Will Not Oscillate with Slow Moving Input Signals

s

Single 5V Supply

s

Pin Compatible with LTC488, LTC489

FEATURES

The LTC

differential quad bus/line receivers that can operate at data

rates as high as 52Mbps. They are pin compatible with the

LTC488/LTC489 RS485 line receivers and operate over the

entire – 7V to 12V common mode range. A unique architec-

ture provides very stable propagation delays and low skew

over wide input common mode, input overdrive and ambi-

ent temperature ranges. Propagation delay is 18.5ns

500ps.

Each receiver translates differential input levels (

300mV) into valid CMOS and TTL output levels. Its high

input resistance (

≥22k) allows many receivers to be con-

nected to the same driver. The receiver outputs go into a

high impedance state when disabled.

The receivers have a fail-safe feature that guarantees a high

output state when the inputs are shorted or left floating.

Other protection features include thermal shutdown and a

controlled maximum short-circuit current (50mA Max).

Input resistance remains

≥22k when the device is

unpowered or disabled, thus allowing hot swapping with-

out loading the data lines.

The LTC1518/LTC1519 operate from a single 5V supply

and draw 12mA of supply current.

s

High Speed RS485/RS422 Receivers

s

STS-1/OC-1 Data Receivers

s

PECL Line Receivers

s

Level Translators

s

Fast-20/Fast-40 SCSI Receiver

Propagation Delay Guaranteed to Fall

Within Shaded Area (

±3.5ns)

1518/19 TA02

3V/DIV

5V/DIV

–5

5

15

TIME (ns)

25

35

0

10203040 45

RECEIVER

INPUT

RECEIVER

OUTPUT

52Mbps Data Communication over Twisted Pair

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

Hot Swap is a trademark of Linear Technology Corporation.