M74HC423AB1R View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
M74HC423AB1R Datasheet PDF : 12 Pages
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M74HC423A
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1,9
2, 10
3, 11
4, 12
7
13, 5
14, 6
15
8
16
SYMBOL
1A, 2A
1B, 2B
1 CLR
2 CLR
1Q, 2Q
2RX/CX
1Q, 2Q
1CX
2CX
1RX/CX
GND
Vcc
NAME AND FUNCTION
Trigger Inputs (Negative
Edge Triggered)
Trigger Inputs (Positive
Edge Triggered)
Direct Reset (Active
LOW)
Outputs (Active Low)
External Resistor
Capacitor Connection
Outputs (Active High)
External Capacitor
Connection
External Resistor
Capacitor Connection
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
A
X
H
L
X
X : Don’t Care
INPUTS
B
H
L
X
X
SYSTEM DIAGRAM
CLR
H
H
H
H
L
OUTPUTS
Q
Q
L
H
L
H
L
H
NOTE
OUTPUT ENABLE
INHIBIT
INHIBIT
OUTPUT ENABLE
INHIBIT
This logic diagram has not be used to estimate propagation delays
2/12
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