5

LTC488/LTC489

LTC488

LTC489

DIFFERENTIAL

ENABLES

OUTPUT

A – B

EN12 or EN34

RO

H

H

H

?

H

L

XL

Z

H: High Level

L: Low Level

X: Irrelevant

?: Indeterminate

Z: High Impedance (Off)

FU CTIO TABLES

DIFFERENTIAL

ENABLES

OUTPUT

A – B

EN

EN

RO

H

X

H

XL

H

H

X

?

XL

?

H

X

L

XL

L

XL

H

Z

TEST CIRCUITS

Figure 1. Receiver Timing Test Circuit

Note:

The input pulse is supplied by a generator having the following characteristics:

D

488/9 F01

DRIVER

RECEIVER

RO

A

B

54

Ω

100pF

100pF

Figure 2. Receiver Enable and Disable Timing Test Circuit

1k

488/9 F02

S1

S2

1k

RECEIVER

OUTPUT