Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)6687000 • Fax (50)668-707 • www.exar.com

SP4082E_00_22007

2

PIN ASSIGNMENTS

Pin Number Pin Name

Pin Function



RO

Receiver Output. When RE is low and if (A – B) ≥ -40mV, RO

is high. If (A – B) ≤ - 200mV, RO is low.

2

RE

REREE

Receiver Output Enable. When RE is low, RO is enabled.

When RE is high, RO is high impedance. Drive RE high and

DE low to enter shutdown mode.

3

DE

Driver Output Enable. When DE is high, outputs are enabled.

When DE is low, outputs are high impedance. Drive DE low

and RE high to enter shutdown mode.

4

DI

Driver Input. With DE high, a low level on DI forces non-

inverting output low and inverting output high. A high level on

DI forces non-inverting output high and inverting output low.

5

GND

Ground

6

A

Non-inverting Receiver Input and Non-inverting Driver Output

7

B

Inverting Receiver Input and Inverting Driver Output

8

Vcc

D

R

A

B

RO

GND

2



3

4

5

6

7

8

DE

RE

DI

8-Pin Half Duplex

8-Pin Half Duplex

DEVICE ARCHITECTURE AND BLOCK DIAGRAM

DEVICE ARCHITECTURE AND BLOCK DIAGRAM