ASM705 / 706 / 707 / 708
ASM813L
February 2005
rev 1.5
Low Power µP Supervisor Circuits
General Description
Features
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Precision power supply monitor
The ASM705 / 706 / 707 / 708 and AS813L are cost effective
CMOS supervisor circuits that monitors power-supply and
battery voltage level, and µP/µC operation.
•4.65V threshold (ASM705/707/813L)
•4.40V threshold (ASM706/708)
Debounced manual reset input
Voltage monitor
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•
The family offers several functional options. Each device
generates a reset signal during power-up, power-down and
during brownout conditions. A reset is generated when the
supply drops below 4.65V (ASM705/707/813L) or 4.40V
(ASM706/708). For 3V power supply applications, refer to the
ASM705P/R/S/T data sheet. In addition, the ASM705/706/813L
feature a 1.6 second watchdog timer. The ASM707/708 have
both active-HIGH and active-LOW reset outputs but no
watchdog function. The ASM813L has the same pin-out and
functions as the ASM705 but has an active-HIGH reset output.
A versatile power-fail circuit has a 1.25V threshold, useful in low
battery detection and for monitoring non-5V supplies. All
devices have a manual reset (MR) input. The watchdog timer
output will trigger a reset if connected to MR.
•1.25V threshold
•Battery monitor / Auxiliary supply monitor
Watchdog timer (ASM705/706/813L)
200ms reset pulse width
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Active HIGH reset output (ASM707/708/813L)
MicroSO package
Applications
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•
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Computers and embedded controllers
Portable/Battery-operated systems
Intelligent instruments
Wireless communication systems
PDAs and hend-held equipment
Automative Systems
Safety Systems
All devices are available in 8-pin DIP, SO and MicroSO
packages.
Typical Operating Circuit
Unregulated DC
+5V Regulator
µP
VCC
R1
VCC
RESET
RESET
(RESET)
(RESET)
PFI
WDI
I/O LINE
ASM705
ASM706
(ASM813L)
NMI
WDO
PFO
R2
MR
INTERRUPT
Alliance Semiconductor
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
Notice: The information in this document is subject to change without notice
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
