LTC1535 查看數據表（PDF） - Linear Technology

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LTC1535

Isolated RS485 Transceiver

Linear Technology 

SWITCHING TIME WAVEFORMS

3V

DI

0V

Z

Y

VO

0V

–VO

1.5V

tr ≤ 10ns, tf ≤ 10ns

1.5V

tPLH

tPHL

VO

20%

80%

VDIFF = V(Y) – V(Z)

tr

tSJ

tSJ

Figure 6. Driver Propagation Delays

80%

20%

tf

LTC1535

1535 F06

3V

DE

0V

5V

Y, Z

VOL

VOH

Y, Z

0V

1.5V

tr ≤ 10ns, tf ≤ 10ns

1.5V

tZL

tLZ

2.3V

OUTPUT NORMALLY LOW

0.5V

2.3V

OUTPUT NORMALLY HIGH

0.5V

tZH

tHZ

tSJ

tSJ

1535 F07

Figure 7. Driver Enable and Disable Times

VOH

RO

VOL

VOD2

A–B

–VOD2

tSJ

1.5V

tPHL

0V

tSJ

OUTPUT

tr ≤ 10ns, tf ≤ 10ns

1.5V

tPLH

INPUT

0V

1535 F08

Figure 8. Receiver Propagation Delays

3V

RE

0V

5V

RO

RO

0V

1.5V

tZH

1.5V

tSJ

1.5V

tr ≤ 10ns, tf ≤ 10ns

tZL

1.5V

tLZ

OUTPUT NORMALLY LOW

tSJ

OUTPUT NORMALLY HIGH

tHZ

tSJ

0.5V

0.5V

tSJ

1535 F09

Figure 9. Receiver Enable and Disable Times

1535fb

9

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