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PDF 74HC4538 Data sheet ( Hoja de datos )
| Número de pieza | 74HC4538 | |
| Descripción | Dual Precision Retriggerable/Resettable Monostable Multivibrators | |
| Fabricantes | Hitachi | |
| Logotipo |  |
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HD74HC4538
Dual Precision Retriggerable/Resettable Monostable
Multivibrators
Description
Each multivibrator features both a negative, A, and a positive, B, transition triggered input, either of which
can be used as an inhibit input. Also included is a clear input that when taken low resets the one short. The
HD74HC4538 is retriggerable. That is, it may be triggered repeatedly while their outputs are generating a
pulse and the pulse will be extended.
Pulse width stability over a wide range of temperature. The output pulse equation is simply: tw = 0.7 (R)
(C).
Features
• High Speed Operation: tpd (A or B to Y) = 22 ns typ (CL = 50 pF)
• 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
CD A B Q Q
LX X L H
HL
HH
HH
Not triggered
H L Not triggered
X : Irrelevant
1 page  
HD74HC4538
DC Characteristics
Item
Input voltage
Output voltage
Input current
Quiescent supply
current
(standby state)
Current drain
(active state)
Ta = 25°C
Ta = –40 to
+85°C
Symbol
VIH
VCC (V) Min Typ Max Min
2.0 1.5 — — 1.5
4.5 3.15 — — 3.15
Max
—
—
Unit
V
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
4.5 4.4 4.5 — 4.4 —
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
4.5 — 0.0 0.1 — 0.1
6.0 — 0.0 0.1 — 0.1
4.5 — — 0.26 — 0.33
6.0 — — 0.26 — 0.33
Iin 6.0 — — ±0.1 — ±1.0 µA
ICC 6.0 — — 130 — 220 µA
ICC 6.0 — — 130 — 220 µA
Test Conditions
Vin = VIH or VIL IOH = –20 µA
IOH = –4 mA
IOH = –5.2 mA
Vin = VIH or VIL IOL = 20 µA
IOL = 4 mA
IOL = 5.2 mA
Vin = VCC or GND
Vin = VCC or GND,
QA = QB = GND, Iout = 0 µA
Vin = VCC or GND,
QA = QB = VCC
Pin 2, 14 = 0.5 VCC
5
5 Page 
Rising-Edge
Trigger
A
B
CX RX
T1 T2
HD74HC4538
VCC
Q
Q
CD
CX RX
T1 T2
VCC
Rising-Edge
Trigger
A
B
CD
Fig. 3 Retriggerable Monostable Circuitry
Q
Q
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet 74HC4538.PDF ] | |
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