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74HC4538 датащи(PDF) 4 Page - STMicroelectronics

номер детали 74HC4538
подробное описание детали  DUAL RETRIGGERABLE MONOSTABLE MULTIVIBRATOR
PDF  14 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

74HC4538 датащи(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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