LTC488CSW datasheet(6/12 Pages) LINER

Il numero della parte	LTC488CSW

Spiegazioni elettronici	Quad RS485 Line Receiver

PDF	12 Pages

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Produttore elettronici	LINER [Linear Technology]

Homepage	http://www.linear.com

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6 / 12 page

LTC488/LTC489

4889fb

TEST CIRCUITS

SWITCHING TIME WAVEFORMS

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

Figure 2. Receiver Enable and Disable Timing Test Circuit

4889 F01

DRIVER

RECEIVER

54Ω

100pF

4889 F02

VCC

RECEIVER

OUTPUT

–VOD2

tPHL

f = 1MHz; tr ≤ 10ns; tf ≤ 10ns

tPLH

VOD2

INPUT

A, B

VOH

1.5V

VOL

INPUT

4889 F03

f = 1MHz; tr ≤ 10ns; tf ≤ 10ns

1.5V

4889 F04

1.5V

tZL

VOL

VOH

1.5V

tLZ

0.5V

tHZ

OUTPUT NORMALLY LOW

OUTPUT NORMALLY HIGH

1.5V

tZH

EN OR

EN12

Figure 3. Receiver Propagation Delays

Figure 4. Receiver Enable and Disable Times

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