Rev. 10/11/02

SP3490/3491 Low Power Full-Duplex RS485 Transceivers

© Copyright 2002 Sipex Corporation

4

Figure 7. Receiver Enable and Disable Timing Circuit

Figure 8. Driver Propagation Delay Waveforms

Figure 9. Driver Differential Output Delay and

Transition Time Waveforms

Figure 10. Driver Enable and Disable Timing Waveforms

Figure 11. Receiver Propagation Delay Waveforms

1.5V

-1.5V

S3

GENERATOR

(NOTE 1)

50Ω

(NOTE 2)

R

1k

S1

S2

0V

3V

1.5V

1.5V

INPUT

Y OUTPUT

Z OUTPUT

OH

2

≈ 1.5V

3V

0V

1.5V

0V

1.5V

INPUT

OUTPUT

CC

2

IN

1.5V

1.5V

3V

0V

OUT

50%

50%

10%

10%

90%

90%

2.0V

-2.0V

0V

0.25V

3V

1.5V

1.5V

DE

OUTPUT

HIGH

0.25V

0V

OUTPUT

LOW

OH

2

≈ 1.5V