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HD74HC643RP Datasheet

  • HD74HC643RP

  • Bus Transceiver

  • 69.71KB

  • 11頁

  • ETC

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HD74HC640/HD74HC643
Octal Bus Transceivers (with 3-state outputs)
Description
Each device has an active enable
G
and a direction control input, DIR. when DIR is high, data flows from
the A inputs to the B outputs. When DIR is low, data flows from the B inputs to the A outputs. The
HD74HC640 transfers inverted data from one bus to other and the HD74HC643 transfers inverted data
from the A bus to the B bus and true data from the B bus to the A bus.
Features
鈥?/div>
High Speed Operation: t
pd
= 12 ns typ (C
L
= 50 pF)
鈥?/div>
High Output Current: Fanout of 15 LSTTL Loads
鈥?/div>
Wide Operating Voltage: V
CC
= 2 to 6 V
鈥?/div>
Low Input Current: 1 碌A(chǔ) max
鈥?/div>
Low Quiescent Supply Current: I
CC
(static) = 4 碌A(chǔ) max (Ta = 25擄C)
Function Table
Control Inputs
G
L
L
H
DIR
L
H
X
Operation
HD74HC640
B
data to A bus
A
data to B bus
Isolation
HD74HC643
B data to A bus
A
data to B bus
Isolation

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