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74221 Datasheet Download - Hitachi Semiconductor

Номер произв 74221
Описание Dual Monostable Multivibrators (with Schmitt Trigger Input)
Производители Hitachi Semiconductor
логотип Hitachi Semiconductor логотип 

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74221 Даташит, Описание, Даташиты
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







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74221 Даташит, Описание, Даташиты
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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74221 Даташит, Описание, Даташиты
HD74HC221
DC Characteristics
Item
Input voltage
Output voltage
Input current
Quiescent supply
current
Sym- VCC Ta = 25°C
Ta = –40 to
+85°C
bol (V) Min Typ Max Min Max Unit Test Conditions
VIH 2.0 1.5 — — 1.5 — V
4.5 3.15 — — 3.15 —
6.0 4.2 — — 4.2 —
VIL 2.0 — — 0.5 — 0.5 V
4.5 — — 1.35 — 1.35
6.0 — — 1.8 — 1.8
VOH 2.0 1.9 2.0 — 1.9 — V Vin = VIH or VIL
4.5 4.4 4.5 — 4.4 —
IOH = –20 µA
6.0 5.9 6.0 — 5.9 —
4.5 4.18 — — 4.13 —
6.0 5.68 — — 5.63 —
VOL 2.0 — 0.0 0.1 — 0.1 V Vin = VIH or VIL
4.5 — 0.0 0.1 — 0.1
IOH = –4 mA
IOH = –5.2 mA
IOL = 20 µA
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33
IOL = 4 mA
6.0 — — 0.26 — 0.33
IOL = 5.2 mA
Iin 6.0 — — ±0.1 — ±1.0 µA Vin = VCC or GND
ICC 6.0 — — 130 — 220 µA Vin = VCC or GND Iout = 0 µA
6.0 — — 130 — 220
Rext/Cent = 0.5 VCC
3










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