LT1785 Просмотр технического описания (PDF) - Linear Technology

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LT1785

60V Fault Protected RS485/RS422 Transceivers

Linear Technology 

SWITCHING TIME WAVEFORMS

LT1785/LT1785A/

LT1791/LT1791A

5V

DI

0V

B

A

VO

0V

–VO

1.5V

f = 125kHz, tr ≤ 10ns, tf ≤ 10ns

tPLH

VO

1/2 VO

10%

tr

tSKEW

90%

VDIFF = V(A) – V(B)

1.5V

tPHL

1/2 VO

tSKEW

90%

10%

tf

Figure 5. Driver Propagation Delays

1785/91 F05

5V

DE

0V

5V

A, B

VOL

VOH

A, B

0V

1.5V

f = 125kHz, tr ≤ 10ns, tf ≤ 10ns

tZL(SHDN), tZL

tLZ

2.3V

OUTPUT NORMALLY LOW

2.3V

OUTPUT NORMALLY HIGH

tZH(SHDN), tZH

tHZ

Figure 6. Driver Enable and Disable Times

1.5V

0.5V

0.5V

178591 F06

VOH

RO

VOL

VOD2

A–B

–VOD2

5V

RE

0V

5V

RO

RO

0V

1.5V

OUTPUT

1.5V

tPHL

f = 125kHz, tr ≤ 10ns, tf ≤ 10ns tPLH

0V

INPUT

0V

Figure 7. Receiver Propagation Delays

1.5V

f = 125kHz, tr ≤ 10ns, tf ≤ 10ns

tZL(SHDN), tZL

tLZ

1.5V

OUTPUT NORMALLY LOW

1.5V

0.5V

1.5V

OUTPUT NORMALLY HIGH

0.5V

tZH(SHDN), tZH

tHZ

Figure 8. Receiver Enable and Disable Times

178591 F07

178591 F08

178491fb

9

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