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EM78P447NAM Datasheet(PDF) 30 Page - ELAN Microelectronics Corp

Part # EM78P447NAM
Description  8-BIT MICRO-CONTROLLER
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Manufacturer  EMC [ELAN Microelectronics Corp]
Direct Link  http://www.emc.com.tw
Logo EMC - ELAN Microelectronics Corp

EM78P447NAM Datasheet(HTML) 30 Page - ELAN Microelectronics Corp

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EM78P447N
OTP ROM
4.10 External Power On Reset Circuit
The circuit shown in Fig.16 implements an external RC to produce the reset pulse. The pulse width
(time constant) should be kept long enough for Vdd to reached minimum operation voltage. This circuit
is used when the power supply has slow rise time. Because the current leakage from the /RESET pin is
about
±5µA, it is recommended that R should not be greater than 40 K. In this way, the /RESET pin
voltage is held below 0.2V. The diode (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 or
ESD (electrostatic discharge) from flowing to pin /RESET.
EM78P447N
/RESET
Vdd
D
R
Rin
C
Fig. 13 External Power-Up Reset Circuit
This specification is subject to change without prior notice.
10.21.2004 (V1.0)
30


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