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HD74LV2G123A Datasheet

  • HD74LV2G123A

  • Datasheet|ADE-205-352A|JUL.20.01|115K

  • 116.17KB

  • 19頁

  • ETC

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HD74LV2G123A
Retriggerable Monostable Multivibrator
ADE-205-352A (Z)
Rev.1
July 2001
Description
The HD74LV2G123A 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 V
CC
. To obtain variable pulse durations, connect an external variable resistance
between Rext/Cext and V
CC
. Once triggered, the basic pulse duration can be extended by retriggering the
gated low level active (A) or high level active (B) input. Pulse duration can be reduced by taking
CLR
low.
The output pulse equation is simply : t
WQ
= Cext
鈥?/div>
Rext.
Low voltage and high speed operation is suitable for the battery powered products (e.g., notebook
computers), and the low power consumption extends the battery life.
Features
鈥?/div>
The basic gate function is lined up as hitachi uni logic series.
鈥?/div>
Supplied on emboss taping for high speed automatic mounting.
鈥?/div>
Electrical characteristics equivalent to the HD74LV123A
Supply voltage range : 1.65 to 5.5 V
Operating temperature range : 鈥?0 to +85擄C
鈥?/div>
All inputs V
IH
(Max.) = 5.5 V (@V
CC
= 0 V to 5.5 V)
All outputs V
O
(Max.) = 5.5 V (@V
CC
= 0 V)
鈥?/div>
Output current 鹵6 mA (@V
CC
= 3.0 V to 3.6 V), 鹵12 mA (@V
CC
= 4.5 V to 5.5 V)
鈥?/div>
All the logical input has hysteresis voltage for the slow transition.

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