MC74AC640 Datasheet, PDF (1/6 Pages) Motorola, Inc – OCTAL BIDIRECTIONAL TRANSCEIVER WITH 3-STATE OUTPUTS

MC74AC640
MC74ACT640
Octal Bidirectional Transceiver
with 3ĆState Outputs
The MC74AC640/74ACT640 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 –24 mA
• ′ACT640 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
A0–A7
OE
T/R
B0–B7
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/P→O/P
X
A to B
A to B
B to A
B to A
Output
X
L
H
L
H
DW SUFFIX
CASE 751D-04
PLASTIC
FACT DATA
5-1