Low-Power, Slew-Rate-Limited

RS-485/RS-422 Transceivers

10

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_______________________________________________________Switching Waveforms

DI

3V

0V

Z

Y

0V

1.5V

10%

90%

90%

1.5V

10%

OUTPUT NORMALLY LOW

OUTPUT NORMALLY HIGH

3V

0V

Y, Z

Y, Z

0V

1.5V

1.5V

2.3V

2.3V

DE

1.5V

0V

1.5V

OUTPUT

INPUT

0V

RO

A-B

OUTPUT NORMALLY LOW

OUTPUT NORMALLY HIGH

3V

0V

RO

RO

0V

1.5V

1.5V

1.5V

1.5V

RE

Figure 8. Driver Propagation Delays

Figure 9. Driver Enable and Disable Times (except MAX488 and

MAX490)

Figure 10. Receiver Propagation Delays

Figure 11. Receiver Enable and Disable Times (except MAX488

and MAX490)

Table 1. Transmitting

Table 2. Receiving

INPUTS

OUTPUT

RE

DE

A-B

RO

0

0

0

1

0

0

0

0

> +0.2V

< -0.2V

Inputs open

X

1

0

1

High-Z

*

X = Don't care

High-Z = High impedance

INPUTS

OUTPUTS

RE

DE

DI

Z

Y

X

X

0

1

1

1

0

0

1

0

X

X

0

1

High-Z

High-Z

*

1

0

High-Z

High-Z

*

X = Don't care

High-Z = High impedance