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ASM708JCSA Datasheet

  • ASM708JCSA

  • 3/3.3/4.0 V uP Supervisor Circuits

  • 16頁

  • ALSC

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ASM706 P/ R/ S/ T/ J
ASM708 R/ S/ T/ J
October 2003
rev 1.0
3/3.3/4.0 V 碌P Supervisor Circuits
Features
鈥?/div>
Precision power supply minotor
鈥?.63V threshold (ASM706P/R, ASM708R)
鈥?.93V threshold (ASM706S, ASM708S)
鈥?.08V threshold (ASM706T, ASM708T)
鈥ew 4.00V threshold (ASM706J , ASM708J)
鈥?/div>
鈥?/div>
Debounced manual reset input
Auxiliary voltage monitor comparator
鈥?.25V threshold
鈥attery monitor / auxiliary supply monitor
鈥?/div>
鈥?/div>
鈥?/div>
Watchdog timer (ASM706P/R/S/T/J)
鈥atchdog can be disabled by floating WDI
200ms reset time delay
Three reset signal options
鈥ctive HIGH: ASM706P
鈥ctive LOW: ASM706R/S/T/J
鈥ctive HIGH and LOW outputs: ASM708R/S/T/J
鈥?/div>
鈥?/div>
DIP, SO and MicroSO packages
Guaranteed RESET assertion to V
CC
= 1.1V
General Description
The ASM706P/R/S/T/J and ASM708R/S/T/J 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 2.63V (ASM706P/R, ASM708R), 2.93V
(ASM706S, ASM708S), 3.08V (ASM706T, ASM708T) or 4.00
(ASM706J, ASM708J). In addition, the ASM706P/R/S/T/J
feature a 1.6 second watchdog timer. The watchdog timer
output will trigger a reset if connected to MR. Floating the WDI
input pin disables the watchdog timer.
The ASM708R/S/T/J have both active-HIGH and active-LOW
reset outputs but no watchdog function. The ASM706P has the
same pin-out and functions as the ASM706R but has an active-
HIGH reset output.
A versatile power-fail circuit, useful in checking battery levels
and non-5V supplies, has a 1.25V threshold. All devices have a
manual reset input. All devices are available in 8-pin DIP, SO
and the compact MicroSO packages. The MicroSO package
requires 50% less PC board area than the conventional SO
package.
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Computers and embedded controllers
CTI applications
Automotive systems
Portable/Battery-operated systems
Intelligent instruments
Wireless communication systems
PDAs and hand-held equipment
Safety systems
Typical Operating Circuit
Unregulated DC
+3.3V Regulator
V
CC
V
CC
PFI
ASM706 R/S/T
ASM708 R/S/T
(ASM706 P)
碌P
R
1
RESET
(RESET)
WDI
WDO
PFO
RESET
(RESET)
I/O LINE
NMI
INTERRUPT
R
2
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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