10/15/02

SP3481/3485 Low Power Half-Duplex RS485 Transceivers

© Copyright 2000 Sipex Corporation

6

Figure 8. Driver Propagation Delay Waveforms

Figure 12. Receiver Enable and Disable Waveforms

Figure 11. Receiver Propagation Delay Waveforms

Figure 10. Driver Enable and Disable Timing Waveforms

0V

3V

1.5V

1.5V

INPUT

Y OUTPUT

Z OUTPUT

OH

2

≈ 1.5V

0V

0.25V

3V

1.5V

1.5V

DE

OUTPUT

HIGH

0.25V

0V

OUTPUT

LOW

OH

2

≈ 1.5V

3V

0V

1.5V

0V

1.5V

INPUT

OUTPUT

CC

2

NOTE 1: The input pulse is supplied by a generator with the following characteristics:

PRR=250KHz, 50% duty cycle, t

NOTE 2: C

IN

1.5V

1.5V

3V

0V

OUT

50%

50%

10%

10%

90%

90%

2.0V

-2.0V

Figure 9. Driver Differential Output Delay and Transition

Time Waveforms

3V

0V

1.5V

1.5V

1.5V

10%

0V

RE

OUTPUT

S1 is open

S2 is closed

S3 = 1.5V

3V

0V

1.5V

1.5V

1.5V

10%

RE

OUTPUT

S1 is closed

S2 is open

S3 = -1.5V