LTC2857CMS-1 datasheet, PDF - EEWORLD Datasheet

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LTC2857CMS-1: Description20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceivers; File Size227KB，20 Pages; ManufacturerLinear ( ADI ); Websitehttp://www.analog.com/cn/index.html

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LTC2857CMS-1 Overview

20Mbps and Slew Rate Limited 15kV RS485/RS422 Transceivers

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LTC2856-1/LTC2856-2

LTC2857-1/LTC2857-2

LTC2858-1/LTC2858-2

20Mbps and Slew Rate

Limited 15kV RS485/RS422

Transceivers

DESCRIPTION

The LTC

2856-1, LTC2856-2, LTC2857-1, LTC2857-2,

LTC2858-1 and LTC2858-2 are low power, RS485/RS422

transceivers operating on 5V supplies at maximum data

rates of 20Mbps or 250kbps for low EMI. The receiver has

a one-eighth unit load, supporting up to 256 nodes per

bus (C, I-Grade), and a failsafe feature that guarantees a

high output state under conditions of ﬂoating or shorted

inputs.

The driver maintains a high output impedance over the

entire common mode range when disabled or when the

supply is removed. Excessive power dissipation caused by

bus contention or a fault is prevented by current limiting

all outputs and by thermal shutdown.

Enhanced ESD protection allows these parts to withstand

±15kV (human body model) on the transceiver interface

pins without latchup or damage.

PART

NUMBER

LTC2856-1

LTC2856-2

LTC2857-1

LTC2857-2

LTC2858-1

LTC2858-2

MAX DATA

RATE (Mbps)

0.25

DUPLEX

Half

Full

PACKAGE

MSOP-8, DFN-8

MSOP-10, DFN-10

FEATURES

■

20Mbps or Low EMI 250kbps Maximum Data Rate

No Damage or Latchup to ESD: ±15kV HBM

High Input Impedance Supports 256 Nodes

(C, I-Grade)

Operation Up to 125°C (H-Grade)

Guaranteed Failsafe Receiver Operation Over the

Entire Common Mode Range

Current Limited Drivers and Thermal Shutdown

Delayed Micropower Shutdown: 5μA Maximum

(C, I-Grade)

Power Up/Down Glitch-Free Driver Outputs

Low Operating Current: 900μA Maximum in Receive

Mode

Compatible with TIA/EIA-485-A Speciﬁcations

Available in 8-Lead and 10-Lead 3mm

3mm DFN

and 8-Lead and 10-Lead MSOP Packages

APPLICATIONS

■

Low Power RS485/RS422 Transceiver

Level Translator

Backplane Transceiver

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

All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

LTC2856-1

RO1

RE1

DE1

DI1

GND1

2V/DIV

CC1

LTC2858-1 at 20Mbps

LTC2856-1

RO2

RE2

DE2

DI2

GND2

285678 TA01a

CC2

Y-Z

20ns/DIV

2856 TA01b

285678fe

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