M54HC4538 데이터 시트보기 (PDF) - STMicroelectronics
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M54HC4538 Datasheet PDF : 14 Pages
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M54/M74HC4538
FUNCTIONAL DESCRIPTION (continued)
RESET OPERATION
CD is normally high. If CD is low, the trigger is not
effective because Q output goes low and trigger
control flip-flop is reset.
Also transistor Op is turned on and Cx is charged
quicky to VCC. This means if CD input goes low, the
IC becomes waiting state both in operating and non
operating state.
TRUTH TABLE
INPUTS
A
B
CD
H
H
X
L
H
H
X
H
L
H
X
X
L
OUTPUTS
Q
Q
L
H
L
H
L
H
INPUT AND OUTPUT EQUIVALENT CIRCUIT
NOTE
OUTPUT ENABLE
INHIBIT
INHIBIT
OUTPUT ENABLE
INHIBIT
PIN DESCRIPTION
PIN No
1, 15
2, 14
3, 13
4, 12
5, 11
6, 10
7, 9
8
16
SYMBOL
1T1, 2T1
1T2, 2T2
1CD, 2CD
1A, 2A
1B, 2B
Q1, Q2
Q1, Q2
GND
VCC
NAME AND FUNCTION
External Capacitor
Connections
External Resistor/Capacitor
Connections
Direct Reset Inputs (Active
LOW)
Trigger Inputs (LOW to
HIGH, Edge-Triggered)
Trigger Inputs (HIGH to
LOW, Edge-Triggered)
Pulse Outputs
Complementary Pulse Outputs
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOL
4/14
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