EM78P447NAM datasheet(31/57 Pages) EMC | 8-BIT MICRO-CONTROLLER

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EM78P447NAM Datasheet(PDF) 31 Page - ELAN Microelectronics Corp

Part #	EM78P447NAM

Description	8-BIT MICRO-CONTROLLER

Download	57 Pages

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Manufacturer	EMC [ELAN Microelectronics Corp]

Direct Link	http://www.emc.com.tw

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EM78P447NAM Datasheet(HTML) 31 Page - ELAN Microelectronics Corp

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EM78P447N

OTP ROM

4.11 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.16 and Fig.17 show how to build the residue-voltage protection circuit.

EM78P447N

/RESET

Vdd

40K

Q1

1N4684

10K

33K

Vdd

Fig. 14 The Residue Voltage Protection Circuit 1

EM78P447N

/RESET

Vdd

Q1

Vdd

40K

R2

R1

Fig. 15 The Residue Voltage Protection Circuit 2

This specification is subject to change without prior notice.

10.21.2004 (V1.0)

31

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