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M74HC4538C1R Folha de dados(PDF) 4 Page - STMicroelectronics

Nome de Peças M74HC4538C1R
Descrição Electrónicos  DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M74HC4538C1R Folha de dados(HTML) 4 Page - STMicroelectronics

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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.
FUNCTIONAL DESCRIPTION (continued)
TRUTH TABLE
INPUTS
OUTPUTS
NOTE
AB
CD
Q
Q
H
H
OUTPUT ENABLE
X
L
H
L
H
INHIBIT
H
X
H
L
H
INHIBIT
L
H
OUTPUT ENABLE
X
X
L
L
H
INHIBIT
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
1, 15
1T1, 2T1
External Capacitor
Connections
2, 14
1T2, 2T2
External Resistor/Capacitor
Connections
3, 13
1CD, 2CD
Direct Reset Inputs (Active
LOW)
4, 12
1A, 2A
Trigger Inputs (LOW to
HIGH, Edge-Triggered)
5, 11
1B, 2B
Trigger Inputs (HIGH to
LOW, Edge-Triggered)
6, 10
Q1, Q2
Pulse Outputs
7, 9
Q1, Q2
Complementary Pulse Outputs
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
IEC LOGIC SYMBOL
M54/M74HC4538
4/14


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