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HT7050A-1 데이터 시트보기 (PDF) - Holtek Semiconductor

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HT7050A-1
Holtek
Holtek Semiconductor Holtek
HT7050A-1 Datasheet PDF : 15 Pages
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HT70xxA-1
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 -1
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 -1
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-1 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 -1
V OUT
V SS
t
V OUT
t
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
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 -1
V SS
Rev. 2.00
7
April 30, 2013

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