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HT7070A Datasheet(PDF) 7 Page - Holtek Semiconductor Inc |
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HT7070A Datasheet(HTML) 7 Page - Holtek Semiconductor Inc |
7 / 16 page HT70XX Rev. 1.60 7 January 14, 2003 The hysteresis width is: VHYS =VDET (+) - VDET (-) The figure demonstrates the NMOS output type with positive output polarity (VOUT is normally open, active low). The HT70XX series also supplies options for other output types with active high outputs. Application cir- cuits shown are examples of positive output polarity (normally open, active low) unless otherwise specified. V S S V D D R A R B R C M 1 M N C o m p a r a t o r V O U T R L V R E . V B V C NMOS output voltage detector (HT70XXA) Application Circuits Microcomputer reset circuit Normally a reset circuit is required to protect the micro- computer system from malfunctions due to power line interruptions. The following examples show how differ- ent output configurations perform a reset function in var- ious 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 HT70XX series can be used to perform a power-on reset function as shown: H T 7 0 X X A V D D V S S V O U T M i c r o - c o m p u t e r C R V D D 2 V D D 1 R E S E T H T 7 0 X X A V S S V O U T M i c r o - c o m p u t e r H T 7 0 4 4 A V O U T V S S R D V I N V D D C t V D D t V O U T V O U T V S S |
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