ADM4850 Просмотр технического описания (PDF) - Analog Devices

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ADM4850

5 V, Slew-Rate Limited, Half-Duplex and Full-Duplex RS-485/RS-422 Transceivers

Analog Devices 

ADM4850/ADM4851/ADM4852/ADM4853/ADM4854/ADM4855/ADM4856/ADM4857

SWITCHING CHARACTERISTICS

3V

1.5V

1.5V

0V

B

VOD

1/2VOD

tPLH

tPHL

A

5V

90% POINT

tSKEW = |tPLH – tPHL|

90% POINT

10% POINT

0V

tR

10% POINT

tF

Figure 24. Driver Propagation Delay, Rise/Fall Timing

DE

A, B

A, B

1.5V

tZL

2.3V

tZH

2.3V

3V

1.5V

0V

tLZ

VOL + 0.5V

VOL

tHZ

VOH

VOH – 0.5V

0V

Figure 26. Driver Enable/Disable Timing

A, B

0V

0V

tPLH

tPHL

VOH

RO

1.5V

tSKEW = |tPLH – tPHL|

1.5V

VOL

Figure 25. Receiver Propagation Delay

RE

1.5V

tZL

3V

1.5V

0V

tLZ

RO

1.5V

OUTPUT LOW

VOL + 0.5V

tZH

tHZ

OUTPUT HIGH

VOL

VOH

RO

1.5V

VOH – 0.5V

0V

Figure 27. Receiver Enable/Disable Timing

Rev. D | Page 12 of 16

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