LTC1518IS#TRPBF【PDF 1/12 页】IC LINE RCVR RS485 QUAD 16-SOIC

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LTC1518/LTC1519

52Mbps Precision Delay

RS485 Quad Line Receivers

Precision Propagation Delay: 18.5ns

±3.5ns Over

°C to 70°C Temperature Range

High Data Rate:

52Mbps

Low tPLH/tPHL Skew: 500ps Typ

Low Channel-to-Channel Skew: 500ps Typ

Guaranteed Fail-Safe Operation over the Entire

Common Mode Range

–7V to 12V RS485 Input Common Mode Range

Input Resistance

≥22k, Even When Unpowered

Hot Swap

TM Capable

High Common Mode Rejection to 26MHz

Short-Circuit Protection: 10mA Typ Output Current

for an Indefinite Short

Three-State Output Capability

Will Not Oscillate with Slow Moving Input Signals

Single 5V Supply

Pin Compatible with LTC488, LTC489

The LTC

1518/LTC1519 are high speed, precision delay

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

±3.5ns

over the commercial temperature range. Typical tPLH/tPHL

and channel-to-channel skew is 500ps.

Each receiver translates differential input levels (

VID ≥

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.

High Speed RS485/RS422 Receivers

STS-1/OC-1 Data Receivers

PECL Line Receivers

Level Translators

Fast-20/Fast-40 SCSI Receiver

Propagation Delay Guaranteed to Fall

Within Shaded Area (

±3.5ns)

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.

FEATURES

DESCRIPTIO

APPLICATIO S

TYPICAL APPLICATIO

1518/19 TA02

VIN =

3V/DIV

VOUT =

5V/DIV

–5

TIME (ns)

10203040 45

RECEIVER

INPUT

VID = 1.5V

RECEIVER

OUTPUT

VDD = 5V

TA = 0°C TO 70°C

100

A 1

1518/19 F08

1/4 LTC1518

LTC1685

2 B

100

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