Revision March 1,2022

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Specifications are subject to change without notice.

Please refer to www.unsemi.com.tw for current information.

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Pin Description

Receiver Output. When enabled, if A-B ≥ -50mV, then RO = high. If A-B ≤ -200 mV, then RO = low.

Receiver Output Enable. A low level enables the RO; A high level places it in a high impedance state.

Driver Output Enable. A high level enables the driver differential outputs, Pin A and Pin B;

A low level places the driver in a high impedance state

Driver Input. When the driver is enabled, a logic low on DI forces Pin A low and Pin B high;

A logic high on DI forces Pin A high and Pin B low.

Ground Connection ( 0V ).

No inverting Receiver Input A/Driver Output A.

Inverting Receiver Input B/Driver Output B.

Power Supply

RO

/RE

GND

A

B

VCC

DE

DI

3

4

1

2

5

6

7

8

Pin Number Pin Name

Function

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These

are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated in

the operational sections of the specifications are not implied. Exposure to absolute maximum rating conditions for

extended periods may affect device reliability

Absolute Maximum Ratings

+7

-0.3~VCC+0.3

-7~13

-0.3~VCC+0.3

-40~85

-60~150

300

400

VCC

/RE,DE,DI

A,B

RO

--

--

--

--

Supply Voltage

Control Input Voltage

Receiver Intput Voltag

Receiver Output Voltage

Operating Temperature

Storage Temperature Range

Lead Temperature

Continuous Power Dissipation

V

V

V

V

°C

°C

°C

mW

Parameter

Value

Unit

Symbol

ROHS

UN485E

±16kV ESD Protected 1Mbps, Half-duplex,

RS485/RS422 Transceiver