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74221 반도체 회로 부품 판매점

Dual Monostable Multivibrators (with Schmitt Trigger Input)



Hitachi Semiconductor 로고
Hitachi Semiconductor
74221 데이터시트, 핀배열, 회로
HD74HC221
Dual Monostable Multivibrators (with Schmitt Trigger Input)
Description
Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which
can be used as an inhibit. Also included is a clear inpt that when taken low resets the one shot. The
HD74HC221 can be triggered on the positive transition of teh clear while A is held low and B is held high.
This device is a non-retriggerable, and therefore cannot be retriggered until the output pulse times out.
The output pulse equation is simply:
tW = 0.7·(Rext)·(Cext)
Features
High Speed Operation
High Output Current: Fanout of 10 LSTTL Loads
Wide Operating Voltage: VCC = 2 to 6 V
Low Input Current: 1 µA max
Low Quiescent Supply Current
Function Table
Inputs
Outputs
Clear
A
B
Q
Q
LX X L H
XH X L H
XX L L H
HL
HH
LH


74221 데이터시트, 핀배열, 회로
HD74HC221
Pin Arrangement
Logic Diagram
A
B
Clear
1A 1
1B 2
CLR1 3
1Q 4
2Q 5
Cext 2 6
2 Rext/
Cext
7
GND 8
CLR
Q
Q
QQ
CLR
(Top view)
16 VCC
15
1 Rext/
Cext
14 1 Cext
13 1Q
12 2Q
11 2CLR
10 2B
9 2A
VCC
Rext
Cext
Cext Rext
/Cext
Clear
Q
Q
Q
2




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