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PDF HD74LV221A Data sheet ( Hoja de datos )
| Número de pieza | HD74LV221A | |
| Descripción | Dual Monostable Multivibrators | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74LV221A
Dual Monostable Multivibrators
ADE-205-271A (Z)
2nd Edition
June 1999
Description
The HD74LV221A features output pulse-duration control by three methods. In the first method, the A
input is low and the B input goes high. In the second method, the B input is high and the A input goes low.
In the third method, the A input is low, the B input is high, and the clear (CLR) input goes high.
The basic pulse duration is programmed by selecting external resistance and capacitance values. The
external timing capacitor must be connected between Cext and Rext/Cext (positive) and an external resistor
connected between Rext/Cext and VCC.
To obtain variable pulse durations, connect an external variable resistance between Rext/Cext and VCC.
Pulse duration can be reduced by taking CLR low.
Features
• VCC = 2.0 V to 5.5 V operation
• All inputs VIH (Max.) = 5.5 V (@VCC = 0 V to 5.5 V)
• All outputs VO (Max.) = 5.5 V (@VCC = 0 V)
• Output current ±6 mA (@VCC = 3.0 V to 3.6 V), ±12 mA (@VCC = 4.5 V to 5.5 V)
1 page  
HD74LV221A
DC Electrical Characteristics
• Ta = –40 to 85°C
Item
Symbol
Input voltage
VIH
VIL
Output voltage VOH
VCC (V)*
2.0
2.3 to 2.7
3.0 to 3.6
4.5 to 5.5
2.0
2.3 to 2.7
3.0 to 3.6
4.5 to 5.5
Min to
Max
Min
1.5
VCC × 0.7
VCC × 0.7
VCC × 0.7
—
—
—
—
VCC – 0.1
Typ
—
—
—
—
—
—
—
—
—
Max
—
—
—
—
0.5
VCC × 0.3
VCC × 0.3
VCC × 0.3
—
Unit Test Conditions
V
V IOL = –50 µA
2.3 2.0
——
IOL = –2 mA
3.0 2.48 —
—
IOL = –6 mA
4.5 3.8
——
IOL = –12 mA
VOL
Min to
—
Max
— 0.1 V IOL = 50 µA
Input current
Input current
Rext / Cext
IIN
IIN
2.3
3.0
4.5
0 to 5.5
5.5
—
—
—
—
—
— 0.4
IOL = 2 mA
— 0.44
IOL = 6 mA
— 0.55
IOL = 12 mA
— ±1
µA VIN = 5.5 V or GND
—
±2.5
µA VIN = VCC or GND
Quiescent
supply current
ICC
5.5 —
— 20
µA VIN = VCC or GND, IO = 0
Active state
supply
current
(per circuit)
∆ICC
2.3
—
— 220 µA VIN = VCC or GND
Rext/Cext = 0.5 VCC
3.0 280
4.5 650
5.5 975
Output leakage IOFF
0
—
—5
current
µA VO = 5.5 V
Input
CIN 3.3 —
capacitance
4.0 —
pF VI = VCC or GND
Note: For conditions shown as Min or Max, use the appropriate values under recommended operating
conditions.
5
5 Page 
• Waveform – 1
Input A
Input B
Input CLR
tf
90%
50%
10%
tr
10%
90%
50%
tr
tf
10%
90%
50%
90%
50%
10%
tPLH (trigger)
tw (L)
tPHL
tr
90%
50%
10%
Output Q
50% VCC
tPHL (trigger)
tPLH
50% VCC
Output Q
50% VCC
50% VCC
HD74LV221A
VCC
GND
VCC
GND
VCC
GND
VOH
VOL
VOH
VOL
11
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet HD74LV221A.PDF ] | |
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