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EM78P257AM Datasheet(PDF) 51 Page - ELAN Microelectronics Corp |
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EM78P257AM Datasheet(HTML) 51 Page - ELAN Microelectronics Corp |
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51 / 91 page  EM78P257 OTP ROM This specification is subject to change without prior notice. 07.27.2004 (V1.4) 51 (D) acts as a short circuit at the moment of power down. The capacitor C will discharge rapidly and fully. Rin, the current-limited resistor, will prevent high current discharge or ESD (electrostatic discharge) from flowing to pin /RESET. EM78P257A/B /RESET Vdd D R Rin C Fig. 22 External Power on Reset Circuit 3. Residue-Voltage Protection When battery is replaced, device power (Vdd) is taken off but residue-voltage remains. The residue-voltage may trips below Vdd minimum, but not to zero. This condition may cause a poor power on reset. Fig.23 and Fig.24 show how to b uild a residue-voltage protection circuit EM78P257A/B /RESET Vdd 100K Q1 1N4684 10K 33K Vdd Fig. 23 Circuit 1 for the residue voltage protection |
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