ADM488ABRZ Просмотр технического описания (PDF) - Analog Devices

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ADM488ABRZ

Full-Duplex, Low Power, Slew Rate Limited, EIA RS-485 Transceivers

Analog Devices 

ADM488A/ADM489A

SWITCHING CHARACTERISTICS

VCC

VCC/2

0V

tPLH

Z

1/2VO

VO

VCC/2

tPHL

Y

+VO

VDIFF

–VO

90% POINT

VDIFF = V(Y) – V(Z)

90% POINT

10% POINT

tDR

10% POINT

tDF

Figure 16. Driver Propagation Delay, Rise/Fall Timing

A–B

RO

0V

0V

tPLH

tPHL

tSKEW = |tPLH – tPHL|

1.5V

1.5V

VOH

VOL

Figure 17. Receiver Propagation Delay

DE

0.5VCC

tZL

2.3V

0.5VCC

tLZ

VCC

0V

Y, Z

tZH

2.3V

Y, Z

VOL + 0.5V

tHZ

VOH – 0.5V

VOL

VOH

0V

Figure 18. Driver Enable/Disable Timing

RE

0.5VCC

tZL

0.5VCC

tLZ

0.7VCC

0.3VCC

1.5V

RO

OUTPUT LOW

VOL + 0.5V

VOL

tZH

tHZ

OUTPUT HIGH

VOH

RO

1.5V

VOH – 0.5V

0V

Figure 19. Receiver Enable/Disable Timing

Rev. 0 | Page 10 of 16

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