HT70XX

Rev. 1.60

7

January 14, 2003

The hysteresis width is:

The figure demonstrates the NMOS output type with

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.

M 1

M N

C o m p a r a t o r

R L

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.

power supply

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

M i c r o -

c o m p u t e r

C

R

R E S E T

H T 7 0 X X A

M i c r o -

c o m p u t e r

H T 7 0 4 4 A

R

D

C

t

t