HT7044A datasheet(6/16 Pages) SYC

6 / 16 page

Application Circuits

HT70XXA-1

Rev. 1.40

January 26, 2006

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

· NMOS open drain output application with R-C delay

Power-on Reset Circuit

With several external components, the NMOS open

drain type of the HT70XXA-1 series can be used to

perform a power-on reset function as shown:

5V Power Line Monitoring Circuit

Generally, a minimum operating voltage of 4.5V is

guaranteed in a 5V power line system. The HT7044A-1

is recommended for use as 5V power line monitoring

circuit.

· 5V power line monitor with power-on reset

H T 7 0 X X A - 1

V D D

V S S

V O U T

M i c r o -

C o m p u t e r

V D D 2

V D D 1

R E S E T

H T 7 0 X X A - 1

V S S

V O U T

M i c r o -

C o m p u t e r

H T 7 0 X X A - 1

V O U T

V S S

V I N

V D D

V O U T

V S S

H T 7 0 4 4 A - 1

V S S

V D D

V S S

V O U T

5 V P o w e r l i n e

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