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74HC123D Scheda tecnica(PDF) 11 Page - NXP Semiconductors |
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74HC123D Scheda tecnica(HTML) 11 Page - NXP Semiconductors |
11 / 17 page 1998 Jul 08 11 Philips Semiconductors Product specification Dual retriggerable monostable multivibrator with reset 74HC/HCT123 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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