IN74HC640A Datasheet, PDF (1/5 Pages) Integral Corp. – OCTAL 3-STATE INVERTING BUS TRANSCEIVER

IN74HC640A
OCTAL 3-STATE INVERTING
BUS TRANSCEIVER
High-Performance Silicon-Gate CMOS
The IN74HC640A is identical in pinout to the LS/ALS640. The
device inputs are compatible with standard CMOS outputs; with
pullup resistors, they are compatible with LS/ALSTTL outputs.
The IN74HC640A 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.
• Outputs Directly Interface to CMOS, NMOS, and TTL
• Operating Voltage Range: 2.0 to 6.0 V
• Low Input Current: 1.0 µA
• High Noise Immunity Characteristic of CMOS Devices
ORDERING INFORMATION
IN74HC640AN Plastic
IN74HC640ADW SOIC
T_A = -55° to 125° 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 (inverted)
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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