HN705/HN706
HN705/HN706
Low-cost, µP Supervisory Circuits
DESCRIPTION
The HN705/706 microprocessor (µP) supervisory circuits reduce the complexity and number of components required to
monitor power-supply and battery functions in µP systems. These devices significantly improve system reliability and
accuracy compared to separate ICs or discrete components.
The HN705/706 provide four functions:
1) A reset output during power-up, power-down, and brownout conditions.
2) An independent watchdog output that goes low if the watchdog input has not been toggled within 1.6 seconds.
3) A 1.25V threshold detector for power-fail warning, low-battery detection, or for monitoring a power supply other than
+5V.
4) An active-low manual-reset input.
Two supply-voltage monitor levels are available: The HN705 generate a reset pulse when the supply voltage drops
below 4.65V, while the HN706 generate a reset pulse below 4.40V.
Devices are available in 8-pin DIP, SO and compact 8-pin MicroSO packages.
FEATURES
ꢀHalts and restarts an out-of-control microprocessor
ꢀHolds microprocessor in check during power
transients
APPLICATIONS
ꢀMicroprocessor Systems
ꢀPDA and portable Equipment
ꢀComputers
ꢀAutomatically restarts microprocessor after power
failure
ꢀPrecision power supply monitor
--4.65V threshold (HN705)
ꢀControllers
ꢀWireless communication systems
ꢀIntelligent Instruments
ꢀAutomotive Systems
ꢀCritical µP Power Monitoring
--4.40V threshold (HN706)
ꢀDebounced manual reset input
ꢀVoltage monitor
--1.25V threshold
--Battery monitor / Auxiliary supply monitor
ꢀWatchdog timer
ꢀ200ms reset pulse width
ꢀEliminates the need for discrete components
ꢀIndustrial temperature range -40 oC to +85 oC
ꢀThe HN705/706 is a plug-in replacement of the
MAX705/706,
DS1705/1706,
IMP705/706,
ADM705/706, MIC705/706 and SP705/706
ORDERING INFORMATION
PART NO.
HN705EN
TEMP. RANGE (°C)
-40 – 85 °C
-40 – 85 °C
-40 – 85 °C
-40 – 85 °C
-40 – 85 °C
-40 – 85 °C
-40 – 85 °C
-40 – 85 °C
PACKAGE
8-Pin DIP
8-Pin SO
8-Pin MicroSO
Dice
8-Pin DIP
8-Pin SO
8-Pin MicroSO
Dice
HN705EM
HN705EU
HN705EX
HN706EN
HN706EM
HN706EU
HN706EX
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, NO. 88 ZHUJIANG ROAD, NANJING 210008, CHINA
电话(TEL.): (86)-25-68853600 传真(FAX): (86)-25-68853600-810
WEB-SITE: WWW.HN-ELEC.COM
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