HT7039A-3 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT7039A-3

TinyPowerTM Voltage Detector

Holtek Semiconductor 

HT70xxA-3

Application Circuits

Microcomputer Reset Circuit

Normally a reset circuit is required to protect the

microcomputer system from malfunctions due to

power line interruptions. The following examples

show how different output configurations perform a

reset function in various systems.

• NMOS open drain output application for separate

power supply

V DD1

V DD2

H T 7 0 x x A -3

V OUT

RESET

M ic r o -

C o m p u te r

V SS

• NMOS open drain output application with R-C delay

V DD

H T 7 0 x x A -3

R

V OUT

M ic r o -

C o m p u te r

C

V SS

Power-on Reset Circuit

With several external components, the NMOS open

drain type of the HT70xxA-3 series can be used to

perform a power-on reset function as shown:

V IN

R

D

C

V SS

V DD

V DD

V OUT

H T 7 0 x x A -3

V OUT

V SS

t

V OUT

t

Rev. 1.00

8

April 18, 2013

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