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ST491A

LOW POWER HIGH SPEED RS-485/RS-422 TRANSCEIVER

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LOW SUPPLY CURRENT: 5mA MAX

DESIGNED FOR RS485 INTERFACE

APPLICATIONS

-7 TO 12 COMMON MODE INPUT VOLTAGE

RANGE

70mV TYPICAL INPUT HYSTERESIS

DESIGNED FOR 25Mbps OPERATION

OPERATE FROM SINGLE 5 SUPPLY

鹵4kV ESD PROTECTION

CURRENT LIMITING AND THERMAL

SHUTDOWN FOR DRIVER OVERLOAD

PROTECTION

DIP

SOP

DESCRIPTION

The ST491A is a low power transceiver for

RS-485 and RS-422 communications. The device

contains one driver and one receiver in full duplex

configuration. The ST491A draws 5mA (typ.) of

supply current when unloaded and operates from

a single 5V supply.

ORDERING CODES

Type

ST491ACN

ST491ABN

ST491ACD

ST491ABD

ST491ACDR

ST491ABDR

Temperature

Range

0 to 70 擄C

-40 to 85 擄C

0 to 70 擄C

-40 to 85 擄C

0 to 70 擄C

-40 to 85 擄C

Package

Driver is short-circuit current limited and is

protected against excessive power dissipation by

thermal shutdown circuitry that place the driver

outputs into a high-impedance state. The receiver

input has a fail-safe feature that guarantees a

logic high output if both inputs are open circuit.

Comments

25parts per tube / 40tube per

25parts per tube / 40tube per

50parts per tube / 20tube per

50parts per tube / 20tube per

2500 parts per reel

2500 parts per reel

box

box

box

box

DIP-14

DIP-14

SO-14 (Tube)

SO-14 (Tube)

SO-14 (Tape & Reel)

SO-14 (Tape & Reel)

July 2003

1/12

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