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74HC423DB Folha de dados(PDF) 10 Page - NXP Semiconductors

Nome de Peças 74HC423DB
Descrição Electrónicos  Dual retriggerable monostable multivibrator with reset
Download  14 Pages
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Fabricante Electrônico  PHILIPS [NXP Semiconductors]
Página de início  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

74HC423DB Folha de dados(HTML) 10 Page - NXP Semiconductors

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1998 Jul 08
10
Philips Semiconductors
Product specification
Dual retriggerable monostable
multivibrator with reset
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.
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.
Fig.11 Power-up output pulse elimination circuit.
Fig.12 Power-down protection circuit.


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