M74HCT640M1R View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M74HCT640M1R Datasheet PDF : 11 Pages
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M74HCT640
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 3, 4, 5, 6,
7, 8, 9
18, 17, 16,
15, 14, 13,
12, 11
19
10
20
SYMBOL
DIR
A1 to A8
NAME AND FUNCTION
Directional Control
Data Inputs/Outputs
B1 to B8 Data Inputs/Outputs
G
GND
VCC
Output Enable Input
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUTS
G
DIR
L
L
L
H
H
X
X : Don’t Care
Z : High Impedance
LOGIC DIAGRAM
FUNCTION
A BUS
OUTPUT
INPUT
Z
B BUS
INPUT
OUTPUT
Z
OUTPUT
A=B
B=A
Z
This logic diagram has not be used to estimate propagation delays
2/11
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