IN74ACT643 Datasheet, PDF (1/5 Pages) Integral Corp. – OCTAL 3-STATE BUS TRANSCEIVER

IN74ACT643
OCTAL 3-STATE BUS TRANSCEIVER
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
PIN 20=V_CC
PIN 10 = GND
FUNCTION TABLE
Control Inputs
Output Direction
Operation
Enable
L
L
Data
Transmitted
from Bus B to
Bus A
L
H
Data
Transmitted
from Bus A to
Bus B (inverted)
H
X
Buses Isolated
(High
Impedance
State)
X = don’t care
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