4

Date: 5/18/04

SP1490E/1491E Full Duplex RS-485 Transceivers

© Copyright 2004 Sipex Corporation

Figure 6. Driver Propagation Delays

+3V

0V

DE

5V

A, B

0V

1.5V

1.5V

A, B

2.3V

2.3V

0.5V

0.5V

Output normally LOW

Output normally HIGH

Figure 7. Driver Enable and Disable Times SP1491E only

Figure 8. Receiver Propagation Delays

+3V

+3V

0V

0V

DI

DI

B

A

DRIVER

DRIVER

OUTPUT

OUTPUT

DIFFERENTIAL

DIFFERENTIAL

OUTPUT

OUTPUT

0V

0V

1.5V

1.5V

1.5V

PLH

f = 1MHz; t

< 10ns

1/2V

1/2V

PHL

DPLH

DPHL

SKEW =

DPHL

|

R

1.5V

1.5V

OUTPUT

A – B

0V

0V

INPUT