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MC74AC643 Datasheet, PDF (1/6 Pages) Motorola, Inc – OCTAL BIDIRECTIONAL TRANSCEIVER WITH 3-STATE OUTPUTS | |||
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MC74AC643
MC74ACT643
Octal Bidirectional Transceiver
with 3ÄState Outputs
The MC74AC643/74ACT643 octal bus transceiver is designed for asynchronous
two-way communication between data buses. The device transmits data from bus A
to bus B when T/R = HIGH, or from bus B to bus A when T/R = LOW. The enable
input can be used to disable the device so the buses are effectively isolated.
⢠Bidirectional Data Path
⢠A and B Outputs Sink 24 mA/Source â24 mA
⢠â²ACT643 Has TTL Compatible Inputs
VCC OE B0 B1 B2 B3 B4 B5 B6 B7
20 19 18 17 16 15 14 13 12 11
OCTAL BIDIRECTIONAL
TRANSCEIVER WITH
3-STATE OUTPUTS
N SUFFIX
CASE 738-03
PLASTIC
1 2 3 4 5 6 7 8 9 10
T/R A0 A1 A2 A3 A4 A5 A6 A7 GND
PIN NAMES
A0âA7
OE
T/R
B0âB7
Side A Inputs or 3-State Outputs
Output Enable Input
Transmit/Receive Input
Side B Inputs or 3-State Outputs
TRUTH TABLE
OE
T/R
H
X
L
H
L
H
L
L
L
L
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Applied
Inputs
X
H
L
H
L
Valid
Direction
I/PâO/P
X
A to B
A to B
B to A
B to A
Output
X
L
H
H
L
DW SUFFIX
CASE 751D-04
PLASTIC
FACT DATA
5-1
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