LTC488CS 데이터 시트보기 (PDF) - Linear Technology

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LTC488CS

Quad RS485 Line Receiver

Linear Technology 

UU

FU CTIO TABLES

LTC488

DIFFERENTIAL

A–B

VID ≥ 0.2V

–0.2V < VID < 0.2V

VID ≤ 0.2V

X

ENABLES

EN

EN

H

X

X

L

H

X

X

L

H

X

X

L

L

H

OUTPUT

RO

H

H

?

?

L

L

Z

LTC489

DIFFERENTIAL

A–B

VID ≥ 0.2V

–0.2V < VID < 0.2V

VID ≤ 0.2V

X

H: High Level

L: Low Level

X: Irrelevant

LTC488/LTC489

ENABLES

OUTPUT

EN12 or EN34

RO

H

H

H

?

H

L

L

Z

?: Indeterminate

Z: High Impedance (Off)

TEST CIRCUITS

100pF

A

D

DRIVER

54Ω

100pF

RECEIVER

B

RO

CL

488/9 F01

Figure 1. Receiver Timing Test Circuit

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

f = 1MHz, Duty Cycle = 50%, tr < 10ns, tf ≤ 10ns, ZOUT = 50Ω

RECEIVER

OUTPUT

S1

1k

VCC

CL

1k

S2

488/9 F02

Figure 2. Receiver Enable and Disable Timing Test Circuit

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