M74HC123(2001) 데이터 시트보기 (PDF) - STMicroelectronics
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M74HC123 Datasheet PDF : 12 Pages
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M74HC123
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 LOW and
trigger Action at Positive
Edge
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
L
X
X : Don’t Care
INPUTS
B
H
L
X
H
X
CLR
H
H
H
H
L
OUTPUTS
Q
Q
L
H
L
H
L
H
NOTE
OUTPUT ENABLE
INHIBIT
INHIBIT
OUTPUT ENABLE
OUTPUT ENABLE
INHIBIT
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