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SP481

Low Power Half-Duplex RS-485 Transceivers

Signal Processing Technologies 

+3V

DE

0V

5V

A, B

VOL

VOH

A, B

0V

fSP481/485 = 1MHz; fSP483 = 100kHz; tR < 10ns; tF < 10ns

1.5V

tZL

2.3V Output normally LOW

1.5V

tLZ

0.5V

2.3V Output normally HIGH

tZH

0.5V

tHZ

Figure 7. Driver Enable and Disable Times

V0D2+

A–B

V0D2–

0V

INPUT

0V

VOH

R

VOL

tPHL

1.5V

OUTPUT

tPLH

1.5V

fSP481/485 = 1MHz; fSP483 = 100kHz; tR < 10ns; tF < 10ns

tSKEW = | tPHL - tPLH |

Figure 8. Receiver Propagation Delays

+3V

RE

0V

5V

R

VIL

VIH

R

0V

fSP481/485 = 1MHz; fSP483 = 100kHz; tR < 10ns; tF < 10ns

1.5V

tZL

1.5V Output normally LOW

1.5V

tLZ

0.5V

1.5V Output normally HIGH

tZH

0.5V

tHZ

Figure 9. Receiver Enable and Disable Times

Rev. 07/28/04

SP481/483/485 Low Power Half-Duplex RS485 Transceivers

7

© Copyright 2002 Sipex Corporation

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