74HCT423N 查看數據表（PDF） - Philips Electronics

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74HCT423N

Dual retriggerable monostable multivibrator with reset

Philips Electronics 

Philips Semiconductors

Dual retriggerable monostable

multivibrator with reset

Product specification

74HC/HCT423

APPLICATION INFORMATION

Power-up considerations

When the monostable is powered-up it may produce an output pulse, with a pulse width defined by the values of RX and

CX, this output pulse can be eliminated using the circuit shown in Fig.11.

Fig.11 Power-up output pulse elimination circuit.

Power-down considerations

A large capacitor (CX) may cause problems when powering-down the monostable due to the energy stored in this

capacitor. When a system containing this device is powered-down or a rapid decrease of VCC to zero occurs, the

monostable may substain damage, due to the capacitor discharging through the input protection diodes. To avoid this

possibility, use a damping diode (DX) preferably a germanium or Schottky-type diode able to withstand large current

surges and connect as shown in Fig.12.

1998 Jul 08

Fig.12 Power-down protection circuit.

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