LTC2854/LTC2855

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285455fc

For more information www.linear.com/LTC2854

3.3V 20Mbps RS485/RS422

Transceivers with Integrated

Switchable Termination

The LTC®2854 and LTC2855 are low power, 20Mbps

RS485/RS422 transceivers operating on 3.3V supplies.

Thereceiverincludesalogic-selectable120Ωtermination,

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 a thermal shutdown.

EnhancedESDprotectionallowstheLTC2854towithstand

±25kV(humanbodymodel)andtheLTC2855towithstand

±15kV on the transceiver interface pins without latchup

or damage.

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Low Power RS485/RS422 Transceiver

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Level Translator

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Backplane Transceiver

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Integrated, Logic-Selectable 120Ω Termination Resistor

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3.3V Supply Voltage

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20Mbps Maximum Data Rate

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No Damage or Latchup Up to ±25kV HBM

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High Input Impedance Supports 256 Nodes (C-, I-Grade)

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Operation Up to 125°C (H-Grade)

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Guaranteed Failsafe Receiver Operation Over the

Entire Common Mode Range

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Current Limited Drivers and Thermal Shutdown

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Delayed Micropower Shutdown: 5µA Maximum (C-, I-Grade)

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Power Up/Down Glitch-Free Driver Outputs

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Low Operating Current: 370µA Typical in Receive Mode

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Compatible with TIA/EIA-485-A Specifications

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Available in 10-Pin 3mm × 3mm DFN, 12-Pin

4mm × 3mm DFN and 16-Pin SSOP Packages

LTC2854 at 20Mbps into 54Ω

PART NUMBER

DUPLEX

PACKAGE

LTC2854

HALF

DFN-10

LTC2855

FULL

SSOP-16, DFN-12

RE

TE

RO

DE

DI

R

D

285455 TA01

LTC2854

120

RE

RO

TE

DE

DI

R

D

LTC2854

120

RE

RO

TE DE

DI

R

D

LTC2854

120

20ns/DIV

2V/DIV

285455 TA01b

A-B

B

A

DI

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.

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