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IMP Inc - 3/3.3/4.0V P SUPERVISOR CIRCUITS

Numéro de référence IMP708REPA
Description 3/3.3/4.0V P SUPERVISOR CIRCUITS
Fabricant IMP Inc 
Logo IMP  Inc 





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IMP708REPA fiche technique
IMP706P/R/S/T/J, IMP708R/S/T/J
POWER MANAGEMENT
3/3.3/4.0V µP Supervisor Circuits
– Low supply current
– Watchdog timer
– Brownout detection
The IMP706P/R/S/T/J and IMP708R/S/T/J CMOS supervisor circuits
monitor power-supply and battery voltage level, and µP/µC operation.
A reset is generated when the supply drops below 2.63V (IMP706P/R,
IMP708R), 2.93V (IMP706S, IMP708S), 3.08V (IMP706T, IMP708T) or 4.00
(IMP706J, IMP708J).
The family offers several functional options. Each device generates a
reset signal during power-up, power-down and during brownout
conditions.
In addition, the IMP706P/R/S/T/J feature a 1.6 second watchdog timer.
The watchdog timer output will trigger a reset if connected to MR.
Unlike competitive devices, floating the WDI input pin disables the
watchdog timer.
The IMP708R/S/T/J have both active-HIGH and active-LOW reset out-
puts but no watchdog function. The IMP706P has the same pin-out and
functions as the IMP706R 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.
Block Diagrams
Key Features
N Lower power, pin compatible replacements for
Maxim MAX706P/R/S/T, MAX708R/S/T
– 30% lower supply current:140µA vs. 200µA
N Precision power supply monitor
– 2.63V threshold (IMP706P/R, IMP708R)
– 2.93V threshold (IMP706S, IMP708S)
– 3.08V threshold (IMP706T, IMP708T)
– New 4.00V threshold (IMP706J, IMP708J)
N Debounced manual reset input
N Auxiliary voltage monitor comparator
– 1.25V threshold
– Battery monitor/auxiliary supply monitor
N Watchdog timer (IMP706P/R/S/T/J)
– Watchdog can be disabled by floating WDI
N 200ms reset time delay
N Three reset signal options
– Active HIGH: IMP706P
– Active LOW: IMP706R/S/T/J
– Active HIGH & LOW outputs: IMP708R/S/T/J
N DIP, SO and MicroSO packages
N Guaranteed RESET assertion to VCC = 1.1V
Applications
N Computers and controllers
N CTI applications
N Embedded controllers
N Battery operated systems
N Intelligent instruments
N Wireless communication systems
N PDAs and handheld equipment
WDI
MR
VCC
PFI
Transition
Detector
VCC
20k
Watchdog
Timer
Timebase
RESET
Generator
+
+
2.63V (IMP706P/R)
2.93V (IMP706S)
3.08V (IMP706T)
4.00V (IMP706J)
+
1.25V
IMP706P/R/S/T/J
© 1999 IMP, Inc.
GND
WDO
RESET
(RESET) IMP706P
PFO
MR
VCC
PFI
VCC
20k
RESET
Generator
+
+–
2.63V (IMP708R)
2.93V (IMP708S)
3.08V (IMP708T)
4.00V (IMP708J)
+
1.25V
RESET
RESET
PFO
IMP708R/S/T/J
706P_01.eps
GND
706P_02.eps
408-432-9100/www.impweb.com
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