LTC2856-1/LTC2856-2

LTC2857-1/LTC2857-2

LTC2858-1/LTC2858-2

1

285678fe

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

20Mbps and Slew Rate

Limited 15kV RS485/RS422

Transceivers

The LTC

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.

■

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

■

Low Power RS485/RS422 Transceiver

■

Level Translator

■

Backplane Transceiver

GND1

R

RO1

RE1

DE1

DI1

D

LTC2856-1

LTC2856-1

285678 TA01a

GND2

R

RO2

RE2

DE2

DI2

D

PART

NUMBER

MAX DATA

RATE (Mbps)

DUPLEX

PACKAGE

LTC2856-1

20

Half

MSOP-8, DFN-8

LTC2856-2

0.25

Half

MSOP-8, DFN-8

LTC2857-1

20

Full

MSOP-8, DFN-8

LTC2857-2

0.25

Full

MSOP-8, DFN-8

LTC2858-1

20

Full

MSOP-10, DFN-10

LTC2858-2

0.25

Full

MSOP-10, DFN-10

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

All other trademarks are the property of their respective owners.

DI

Y

Z

Y-Z

20ns/DIV

2856 TA01b

LTC2858-1 at 20Mbps