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PDF HD74AC123A Data sheet ( Hoja de datos )
| Número de pieza | HD74AC123A | |
| Descripción | Dual Retriggerable Resettable Multivibrator | |
| Fabricantes | Hitachi Semiconductor | |
| Logotipo |  |
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HD74AC123A
Dual Retriggerable Resettable Multivibrator
Description
Each half of the HD74AC123A features retriggerable capability, complementary dc level triggering and
overriding Direct Clear. When a circuit is in the quasi-stable (delay) state, another trigger applied to the
inputs (per the Truth Table) will cause the delay period to start again, without disturbing the outputs. By
repeating this process, the output pulse period (Q High, Q Low) can be made as long as desired.
Alternatively, a delay period can be terminated at any time by a Low signal on CD, which also inhibits
triggering. An internal connection from CD to the input gate makes it possible to trigger the circuit by a
positive-going signal on CD, as shown in the Truth Table. For timing capacitor values greater than 1000
pF, the output pulse width is defined as follows.
Where tw is in ns, RX is in k and C X is in pF.
tw = RXCX
Feature
• Outputs Source/Sink 24 mA
1 page  
HD74AC123A
Item
Output pulse width
Symbol
TWQ
VCC (V)*1
3.3
5.0
Ta = +25°C
CL = 50 pF
Min Typ
——
0.90 —
Ta = –40°C
to +85°C
CL = 50 pF
Max Min Max Unit Condition
— — — ms Cext = 0.1 µF
1.10 0.85 1.15
Rext = 10 kΩ
Minimum output
pulse width
TWQ(min)
3.3
5.0
190 —
160 —
350 170 380 ns Cext = 28 pF
300 140 330
Rext = 2 kΩ
Note: 1. Voltage Range 3.3 is 3.3 V ± 0.3 V
Voltage Range 5.0 is 5.0 V ± 0.5 V
Cext and Rext should be connected as close to the IC terminals as possible, in order to prevent malfunction.
5
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet HD74AC123A.PDF ] | |
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| Número de pieza | Descripción | Fabricantes |
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