LTC2856-1/LTC2856-2

LTC2857-1/LTC2857-2

LTC2858-1/LTC2858-2

1

285678ff

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

Typical applicaTion

FeaTures

applicaTions

DescripTion

20Mbps and Slew Rate

Limited 15kV RS485/RS422

Transceivers

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

outputstateunderconditionsoffloatingorshortedinputs.

The driver maintains a high output impedance over the

entire common mode range when disabled or when the

supplyisremoved.Excessivepowerdissipationcausedby

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.

n

20Mbps or Low EMI 250kbps Maximum Data Rate

n

No Damage or Latchup to ESD: ±15kV HBM

n

High Input Impedance Supports 256 Nodes

(C, I-Grade)

n

Operation Up to 125°C (H-Grade)

n

Guaranteed Failsafe Receiver Operation Over the

Entire Common Mode Range

n

Current Limited Drivers and Thermal Shutdown

n

Delayed Micropower Shutdown: 5µA Maximum

(C, I-Grade)

n

Power Up/Down Glitch-Free Driver Outputs

n

Low Operating Current: 900µA Maximum in Receive

Mode

n

Compatible with TIA/EIA-485-A Specifications

n

Available in 8-Lead and 10-Lead 3mm

× 3mm DFN

and 8-Lead and 10-Lead MSOP Packages

n

Low Power RS485/RS422 Transceiver

n

Level Translator

n

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

DI

Y

Z

Y-Z

20ns/DIV

2856 TA01b

LTC2858-1 at 20Mbps

L

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

Technology Corporation. All other trademarks are the property of their respective owners.