Datasheet > LTC1685

LTC1685

更新时间： 2022-12-13 18:57:41

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
12页	273K
描述
52Mbps, Precision Delay, RS485 Fail-Safe Transceiver

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LTC1685 数据手册

LTC1685

52Mbps, Precision Delay,

RS485 Fail-Safe Transceiver

DESCRIPTION

FEATURES

The LTC^®1685 is a high speed, precision delay RS485

transceiverthatcanoperateatdataratesashighas52Mbps.

The device also meets the requirements of RS422.

■

Precision Propagation Delay Over Temperature:

Receiver/Driver: 18.5ns

High Data Rate: 52Mbps

Low t_PLH/t_PHLSkew:

±3.5ns

■

A unique architecture provides very stable propagation

delays and low skew over a wide common mode and

ambient temperature range.

Receiver/Driver: 500ps Typ

■

–7V to 12V RS485 Input Common Mode Range

Guaranteed Fail-Safe Receiver Operation Over the

Entire Common Mode Range

High Receiver Input Resistance: ≥22k, Even When

Unpowered

The driver and receiver feature three-state outputs, with

disabled driver outputs maintaining high impedance over

the entire common mode range. A short circuit feature

detects shorted outputs and substantially reduces driver

output current. A similar feature also protects the receiver

output from short circuits. Thermal shutdown circuitry

protects from excessive power dissipation.

■

Short-Circuit Protected

Thermal Shutdown Protected

Driver Maintains High Impedance in Three-State or

with Power Off

■

Single 5V Supply

The receiver has a fail-safe feature that guarantees a high

output state when the inputs are shorted or are left floating.

The LTC1685 RS485 transceiver guarantees receiver fail-

safe operation over the entire common mode range (–7V

to 12V). Input resistance will remain ≥22k when the device

is unpowered or disabled.

Pin Compatible with LTC485

45dB CMRR at 26MHz

APPLICATIONS

■

High Speed RS485/RS422 Transceivers

■

Level Translator

The LTC1685 operates from a single 5V supply and draws

only 7mA of supply current.

■

Backplane Transceiver

STS-1/OC-1 Data Transceiver

Fast-20, Fast-40 SCSI Transceivers

■

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

■

TYPICAL APPLICATION

10Mbps Data Pulse

400ft Category 5 UTP

RO1

CC1

RE1

DE1

DI1

DRIVER INPUT

2V/DIV

CABLE DELAY

GND1

RECEIVER

INPUT

1V/DIV

5V/DIV

RO2

RE2

DE2

DI2

CC2

RECEIVER

OUTPUT

GND2

100ns/DIV

1685 TA01

1685 TA02

12 3 4 5 6 7...12

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