IN74ACT643
O
CTAL
3-S
TATE
B
US
T
RANSCEIVER
High-Speed Silicon-Gate CMOS
The IN74ACT643 is identical in pinout to the LS/ALS643,
HC/HCT643. The IN74ACT623 may be used as a level converter
for interfacing TTL or NMOS outputs to High Speed CMOS
inputs.
The IN74ACT643 is a 3-state transceiver that is used for 2-
way asynchronous communication between data buses. The
device has an active-low Output Enable pin, which is used to
place the I/O ports into high-impedance states. The Direction
control determines whether data flows from A to B or from B to A.
•
TTL/NMOS Compatible Input Levels
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 4.5 to 5.5 V
Low Input Current: 1.0
µA;
0.1
µA
@ 25°C
Outputs Source/Sink 24 mA
•
•
•
•
ORDERING INFORMATION
IN74ACT643N Plastic
IN74ACT643DW SOIC
T
A
= -40° to 85° C for all
packages
PIN ASSIGNMENT
LOGIC DIAGRAM
FUNCTION TABLE
Control Inputs
Output Direction
Enable
L
L
Operation
Data
Transmitted
from Bus B to
Bus A
Data
Transmitted
from Bus A to
Bus B (inverted)
Buses Isolated
(High
Impedance
State)
L
H
PIN 20=V
CC
PIN 10 = GND
H
X
X = don’t care
1
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