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ASM705ESA Datasheet

  • ASM705ESA

  • Low Power UP Supervisor Circuits

  • 15頁

  • ALSC

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ASM705 / 706 / 707 / 708
ASM813L
July 2004
rev 1.2
Low Power 碌P Supervisor Circuits
General Description
The ASM705 / 706 / 707 / 708 and AS813L are cost effective
CMOS supervisor circuits that monitor power-supply and
battery voltage level, and 碌P/碌C operation.
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.
All devices are available in 8-pin DIP, SO and MicroSO
packages.
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Features
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Precision power supply monitor
鈥?.65V threshold (ASM705/707/813L)
鈥?.40V threshold (ASM706/708)
Debounced manual reset input
Voltage monitor
鈥?.25V threshold
鈥attery monitor / Auxiliary supply monitor
Watchdog timer (ASM705/706/813L)
200ms reset pulse width
Active HIGH reset output (ASM707/708/813L)
MicroSO package
Applications
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Computers and embedded controllers
Portable/Battery-operated systems
Intelligent instruments
Wireless communication systems
PDAs and hendheld equipment
Automative Systems
Safety Systems
Typical Operating Circuit
Unregulated DC
+5V Regulator
R
1
V
CC
PFI
RESET
(RESET)
V
CC
碌P
RESET
(RESET)
I/O LINE
NMI
INTERRUPT
R
2
ASM705
WDI
ASM706
(ASM813L)
WDO
PFO
MR
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

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