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

SP48E-485E_00_06609

4

pin FUnction

Pin1–RO–ReceiverOutput.

Pin2–RE–ReceiverOutputEnableActiveLOW.

Pin3–DE–DriverOutputEnableActiveHIGH.

Pin4–DI–DriverInput.

Pin5–GND–GroundConnection.

Pin6–A–DriverOutput/ReceiverInputNon-inverting.

Pin7–B–DriverOutput/ReceiverInputInverting.

Pin8–Vcc–PositiveSupply4.75V<Vcc<5.25V.

SP48E and SP485E

Pinout(TopView)

RO 1

RE 2

DE 3

DI 4

7 B

6 A

5 GND

D

R

SP485

Top View

Figure5.DriverPropagationDelays

+3V

0V

DI

B

A

DRIVER

OUTPUT

DIFFERENTIAL

OUTPUT

0V

1.5V

1.5V

Figure1.RS-485DriverDCTestLoadCircuit

Figure3.RS-485Driver/ReceiverTimingTestCircuit

15pF

RO

A

B

A

B

DI

DE

3V

500

Output

Under

Test

1K

1K

Receiver

Output

Test Point

Figure2.ReceiverTimingTestLoadCircuit

Figure4.RS-485DriverTimingTestLoad#2Circuit

A

B

R

R