HD74LV221A Просмотр технического описания (PDF) - Hitachi -> Renesas Electronics

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HD74LV221A

Dual Monostable Multivibrators

Hitachi -> Renesas Electronics 

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)

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