±15kV ESD-Protected, Slew-Rate-Limited,

Low-Power, RS-485/RS-422 Transceivers

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11

DI

DE

3V

Y

Z

A

B

RO

RE

OUTPUT

UNDER TEST

500

Ω

S1

S2

Figure 10. Driver/Receiver Timing Test Circuit

Figure 11. Driver Timing Test Load

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

Figure 12. Driver Propagation Delays

Figure 13. Driver Enable and Disable Times (except MAX488E

and MAX490E)

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 14. Receiver Propagation Delays

Figure 15. Receiver Enable and Disable Times (except MAX488E

and MAX490E)