SP481E_07 datasheet(4/11 Pages) SIPEX

Part #	SP481E

Description	Enhanced Low Power Half-Duplex RS-485 Transceivers

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Manufacturer	SIPEX [Sipex Corporation]

Direct Link	http://www.sipex.com

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4 / 11 page

May11-2007

SP481E Low Power Half-Duplex RS485 Transceivers

4

PIN FUNCTION

Pin 1 – RO – Receiver Output.

Pin 2 – RE – Receiver Output Enable Active LOW.

Pin 3 – DE – Driver Output Enable Active HIGH.

Pin 4 – DI – Driver Input.

Pin 5 – GND – Ground Connection.

Pin 6 – A – Driver Output/Receiver Input

Non-inverting.

Pin 7 – B – Driver Output/Receiver Input Inverting.

Pin 8 – Vcc – Positive Supply 4.75V<Vcc< 5.25V.

SP481E and SP485E

Pinout (Top View)

RO 1

RE 2

DE 3

DI 4

8

VCC

7

B

6

A

5

GND

D

R

SP485

Top View

Figure 5. Driver Propagation Delays

A

VOD

VOC

B

R

Figure 1. RS-485 Driver DC Test Load Circuit

Figure 2. Receiver Timing Test Load Circuit

Figure 3. RS-485 Driver/Receiver Timing Test Circuit

Figure 4. RS-485 Driver Timing Test Load #2 Circuit

CRL

1k

S2

S1

VCC

1k

Test Point

Receiver

Output

B

A

DI

B

A

CL1

CL2

RDIFF

RO

15pF

S2

S1

VCC

CL

500

Output

Under

Test

+3V

0V

DI

B

A

DRIVER

OUTPUT

VO+

DIFFERENTIAL

OUTPUT

VA – VB

0V

VO–

1.5V

tPLH

tR

tF

f = 1MHz; tR < 10ns; tF < 10ns

VO

1/2VO

tPHL

tDPLH

tDPHL

tSKEW =

SKEW =

| tDPLH - tDPHL |

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SP481E Datasheet(PDF) 4 Page - Sipex Corporation

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