HT7033A-2 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT7033A-2

TinyPower™ Voltage Detector

Holtek Semiconductor 

HT70xxA-2

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 -2

V OUT

RESET

M ic r o -

C o m p u te r

V SS

Power-on Reset Circuit

With several external components, the NMOS open

drain type of the HT70xxA-2 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 -2

V OUT

V SS

· NMOS open drain output application with R-C delay

V DD

R

V OUT

M ic r o -

t

H T 7 0 X X A -2

C o m p u te r

V OUT

C

V SS

t

5V Power Line Monitoring Circuit

Generally, a minimum operating voltage of 4.5V is

guaranteed in a 5V power line system. The HT7044A-2

is recommended for use as 5V power line monitoring

circuit.

· 5V power line monitor with power-on reset

5 V P o w e r lin e

R

D

C

V SS

V DD

V OUT

H T 7 0 4 4 A -2

V SS

Rev. 1.20

7

December 14, 2012

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