M74HC221AC1R View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M74HC221AC1R Datasheet PDF : 14 Pages
| |||
M54/M74HC221/221A
TRUTH TABLE
INPUTS
A
B
CLR
H
H
X
L
H
H
X
H
L
H
L
H
X
X
L
X: Don’t Care (*): Except for monostble period
OUTPUTS
Q
Q
L (*)
H (*)
L (*)
H (*)
L
H
INPUT AND OUTPUT EQUIVALENT CIRCUIT
NOTE
OUTPUT ENABLE
INHIBIT
INHIBIT
OUTPUT ENABLE
OUTPUT ENABLE
INHIBIT
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
1CLR,
2CLR
1Q, 2Q
2REXT/CEXT
1Q, 2Q
1CEXT
2CEXT
1REXT/CEXT
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
IEC LOGIC SYMBOL
4/14
Share Link: 