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M54HC221 Datasheet(PDF) 4 Page - STMicroelectronics

Part # M54HC221
Description  DUAL MONOSTABLE MULTIVIBRATOR
PDF  14 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M54HC221 Datasheet(HTML) 4 Page - STMicroelectronics

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TRUTH TABLE
INPUTS
OUTPUTS
NOTE
A
B
CLR
Q
Q
H
H
OUTPUT ENABLE
X
L
H
L (*)
H (*)
INHIBIT
H
X
H
L (*)
H (*)
INHIBIT
L
H
OUTPUT ENABLE
L
H
OUTPUT ENABLE
X
X
L
L
H
INHIBIT
X: Don’t Care
(*): Except for monostble period
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
NAME AND FUNCTION
1, 9
1A, 2A
Trigger Inputs (Negative
Edge Triggered)
2, 10
1B, 2B
Trigger Inputs (Positive
Edge Triggered)
3, 11
1CLR,
2CLR
Direct Reset LOW and
Trigger Action at Positive
Edge
4, 12
1Q, 2Q
Outputs (Active LOW)
72REXT/CEXT
External Resistor
Capacitor Connection
13, 5
1Q, 2Q
Outputs (Active HIGH)
14, 6
1CEXT
2CEXT
External Capacitor
Connection
15
1REXT/CEXT
External Resistor
Capacitor Connection
8
GND
Ground (0V)
16
VCC
Positive Supply Voltage
IEC LOGIC SYMBOL
M54/M74HC221/221A
4/14



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