LTC2857CDD-1-TRPBF Просмотр технического описания (PDF) - Analog Devices

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LTC2857CDD-1-TRPBF

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

Analog Devices 

LTC2856-1/LTC2856-2

LTC2857-1/LTC2857-2

LTC2858-1/LTC2858-2

20Mbps and Slew Rate Limited

15kV RS485/RS422 Transceivers

FEATURES

nn 20Mbps or Low EMI 250kbps Maximum Data Rate

nn No Damage or Latchup to ESD: ±15kV HBM

nn High Input Impedance Supports 256 Nodes

(C, I-Grade)

nn Operation Up to 125°C (H-Grade)

nn Guaranteed Failsafe Receiver Operation Over the

Entire Common Mode Range

nn Current Limited Drivers and Thermal Shutdown

nn Delayed Micropower Shutdown: 5µA Maximum

(C, I-Grade)

nn Power Up/Down Glitch-Free Driver Outputs

nn Low Operating Current: 900µA Maximum in Receive

Mode

nn Compatible with TIA/EIA-485-A Specifications

nn Available in 8-Lead and 10-Lead 3mm × 3mm DFN

and 8-Lead and 10-Lead MSOP Packages

APPLICATIONS

nn Low Power RS485/RS422 Transceiver

nn Level Translator

nn Backplane Transceiver

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of

Analog Devices, Inc. All other trademarks are the property of their respective owners.

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 limit-

ing 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)

20

0.25

20

0.25

20

0.25

DUPLEX

Half

Half

Full

Full

Full

Full

PACKAGE

MSOP-8, DFN-8

MSOP-8, DFN-8

MSOP-8, DFN-8

MSOP-8, DFN-8

MSOP-10, DFN-10

MSOP-10, DFN-10

TYPICAL APPLICATION

LTC2856-1

RO1

R

RE1

VCC1

DE1

DI1

D

GND1

LTC2856-1

RO2

R

RE2

VCC2

DE2

DI2

D

GND2

285678 TA01a

LTC2858-1 at 20Mbps

DI

RT

Y

Z

RT

Y-Z

For more information www.linear.com/LTC2856-1

20ns/DIV

2856 TA01b

285678fg

1

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