LTC1484C datasheet(10/16 Pages) LINER

Part #	LTC1484C

Description	Low Power RS485 Transceiver with Receiver Fail-Safe

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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10

LTC1484

SWITCHI G TI E WAVEFOR S

Figure 6. Driver Propagation Delays

Figure 9. Receiver Enable and Shutdown Timing

Figure 8. Receiver Propagation Delays

1.5V

2.3V

tZH(SHDN), tZH

NOTE: A, B ARE THREE-STATED WHEN DE = 0, 1k

Ω PULL-UP OR 1kΩ PULL-DOWN

tZL(SHDN), tZL

1.5V

0.5V

tHZ

tLZ

OUTPUT NORMALLY LOW

OUTPUT NORMALLY HIGH

3V

0V

DE

5V

VOL

VOH

0V

A, B

1484 F07

f = 1MHz, tr ≤ 10ns, tf ≤ 10ns

Figure 7. Driver Enable and Disable Timing

1.5V

tZH(SHDN), tZH

NOTE: DE = 0, RO IS THREE-STATED IN SHUTDOWN, 1k

Ω PULL-UP FOR NORMALLY LOW OUTPUT,

1k

Ω PULL-DOWN FOR NORMALLY HIGH OUTPUT

tZL(SHDN), tZL

1.5V

0.5V

tHZ

tLZ

OUTPUT NORMALLY LOW

OUTPUT NORMALLY HIGH

RE

5V

0V

5V

0V

RO

1484 F09

f = 1MHz, tr ≤ 10ns, tf ≤ 10ns

0V

tPHL

A – B

VOL

RO

1.5V

NOTE: tSKD = |tPHL – tPLH|, RE = 0

1.5V

0V

tPLH

INPUT

OUTPUT

5V

–VOD2

VOD2

1484 F08

f = 1MHz, tr ≤ 10ns, tf ≤ 10ns

DI

3V

1.5V

tPLH

tr

tSKEW

NOTE: DE = 1

1/2 VO

VO

f = 1MHz, tr ≤ 10ns, tf ≤ 10ns

90%

50%

10%

0V

B

A

VO

–VO

90%

1.5V

tPHL

tSKEW

10%

tf

VO = V(A) – V(B)

1484 F06

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