MAX1487E Просмотр технического описания (PDF) - Maxim Integrated

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производитель

MAX1487E

±15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers

Maxim Integrated 

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

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

3V

DE

DI

Y

VID

Z

CL1

A

RDIFF

B

CL2

RO

RE

OUTPUT

UNDER TEST

500Ω

CL

VCC

S1

S2

Figure 10. Driver/Receiver Timing Test Circuit

Figure 11. Driver Timing Test Load

3V

DI

1.5V

0V

Z

Y

VDIFF

VO

0V

-VO

VO

1/2 VO

10%

tR

1.5V

tPLH

tPHL

1/2 VO

VDIFF = V (Y) - V (Z)

90%

90%

10%

tF

tSKEW = | tPLH - tPHL |

Figure 12. Driver Propagation Delays

VOH

RO

VOL

A-B VID

-VID

0V

1.5V

OUTPUT

1.5V

tPHL

tPLH

INPUT

0V

Figure 14. Receiver Propagation Delays

3V

DE

1.5V

0V

Y, Z

VOL

Y, Z

0V

1.5V

tZL(SHDN), tZL

tLZ

2.3V OUTPUT NORMALLY LOW

OUTPUT NORMALLY HIGH

2.3V

tZH(SHDN), tZH

tHZ

VOL +0.5V

VOH -0.5V

Figure 13. Driver Enable and Disable Times (except MAX488E

and MAX490E)

3V

RE

1.5V

0V

VCC

RO

RO

0V

1.5V

tZL(SHDN), tZL

tLZ

1.5V OUTPUT NORMALLY LOW

OUTPUT NORMALLY HIGH

1.5V

tZH(SHDN), tZH

tHZ

VOL + 0.5V

VOH - 0.5V

Figure 15. Receiver Enable and Disable Times (except MAX488E

and MAX490E)

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