HN809 / HN810
HN809 / HN810
3-Pin Microprocessor Reset Monitors
Product Description
The HN809/810 microprocessor supervisory circuits can be used to monitor the power supplies in microprocessor and
digital systems. They provide a reset to the microprocessor during power-up, power-down and brown-out conditions.
The function of the HN809/810 is to monitor the V
CC
supply voltage, and assert a reset signal whenever this voltage
declines below the factory-programmed reset threshold. The reset signal remains asserted until V
CC
has risen above
V
RESET
for a minimum period of time. The HN809 has an active-low
RESET
output, while the HN810 has an active-high
RESET output.
Seven standard reset voltage options are available, suitable for monitoring 5V, 3.3V, and 3V supply voltages.
With a low supply current of only 15 A, the HN809/810 are ideal for use in portable equipment. The HN809/HN810 are
available in the 3-pin SOT23 package.
Features
Precise monitoring of 3V, 3.3V, and 5V supply voltages
Superior upgrade to MAX809/810
Fully specified over temperature
Guaranteed RESET Output valid for V
CC
1V
Active-low
RESET
Output (HN809)
Active-high RESET Output (HN810)
Low Supply Current.
Power supply transient immunity
Applications
Microprocessor Systems
Computers
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
Automotive
Pin Configuration
GND
1
Pin Descriptions
Pin No.
1
3
V
CC
Name
GND
RESET
(HN809)
Pin Function
Ground reference
Active-low output.
RESET
remains low while
V
CC
is below the reset threshold, and for a
minimum period of time after V
CC
rises above the
reset threshold.
Active-high output. RESET remains high while
V
CC
is below the reset threshold, and for a
minimum period of time after V
CC
rises above the
reset threshold.
Supply Voltage (+5V, +3.3V, or +3.0V)
RESET
RESET
2
2
SOT23-3
(Top View)
RESET
(HN810)
3
V
CC
NOTE:
RESET is for
HN809
RESET is for
HN810
Typical Application Circuit
V
CC
V
CC
HN809/810
RESET
RESET
GND
V
CC
PROCESSOR
RESET
INPUT
GND
Order and Threshold Information
V
TH
(V)
2.45
2.63
2.93
3.08
4.00
4.38
4.63
HN809 Series
HN809M-2.45
HN809M-2.63
HN809M-2.93
HN809M-3.08
HN809M-4.00
HN809M-4.38
HN809M-4.63
HN810 Series
HN810M-2.45
HN810M-2.63
HN810M-2.93
HN810M-3.08
HN810M-4.00
HN810M-4.38
HN810M-4.63
Package
SOT23-3
地址: 南京市珠江路
88
号，新世界中心
B
座
4004
室, 邮编:210008
ADD.: RM. 4004,
BLOCK B,
NEW WORLD CENTRE,
电话(TEL.):
(86)-25-68853600
传真(FAX):
(86)-25-68853600-810
WEB-SITE: WWW.HN-ELEC.COM
NO. 88 ZHUJIANG ROAD,
1
NANJING 210008,
CHINA
HN [ NANJING HONANO ELECTRONIC CO., LTD. ]
