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74HC4538D Datasheet(PDF) 11 Page - NXP Semiconductors |
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74HC4538D Datasheet(HTML) 11 Page - NXP Semiconductors |
11 / 13 page September 1993 11 Philips Semiconductors Product specification Dual retriggerable precision monostable multivibrator 74HC/HCT4538 Fig.11 Power-down protection 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 sustain 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.11. Fig.12 Typical pulse width accuracy versus external capacitance; VCC = 4.5 V; Tamb = 25 °C. Fig.13 Typical pulse width accuracy versus external resistance; VCC = 4.5 V; Tamb = 25 °C. |
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