IMP706P/R/S/T/J, IMP708R/S/T/J
P
OWER
M
ANAGEMENT
3/3.3/4.0V 碌P Supervisor Circuits
鈥?Lo w suppl y cur r ent
鈥?Watc hdog timer
鈥?Br o wnout det ection
The IMP706P/R/S/T/J and IMP708R/S/T/J CMOS supervisor circuits
monitor power-supply and battery voltage level, and
碌P/碌C
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.
Key Features
N
Lower power, pin compatible replacements for
Maxim MAX706P/R/S/T, MAX708R/S/T
鈥?30% lower supply current:140碌A(chǔ) vs. 200碌A(chǔ)
N
Precision power supply monitor
鈥?2.63V threshold (IMP706P/R, IMP708R)
鈥?2.93V threshold (IMP706S, IMP708S)
鈥?3.08V threshold (IMP706T, IMP708T)
鈥?New 4.00V threshold (IMP706J, IMP708J)
N
Debounced manual reset input
N
Auxiliary voltage monitor comparator
鈥?1.25V threshold
鈥?Battery monitor/auxiliary supply monitor
N
Watchdog timer (IMP706P/R/S/T/J)
鈥?Watchdog can be disabled by floating WDI
N
200ms reset time delay
N
Three reset signal options
鈥?Active HIGH: IMP706P
鈥?Active LOW: IMP706R/S/T/J
鈥?Active HIGH & LOW outputs: IMP708R/S/T/J
N
DIP, SO and MicroSO packages
N
Guaranteed RESET assertion to V
CC
= 1.1V
Applications
N
N
N
N
N
N
N
Computers and controllers
CTI applications
Embedded controllers
Battery operated systems
Intelligent instruments
Wireless communication systems
PDAs and handheld equipment
Block Diagrams
WDI
V
CC
Timebase
20k鈩?/div>
Transition
Detector
Watchdog
Timer
WDO
V
CC
20k鈩?/div>
RESET
MR
V
CC
+
+
鈥?/div>
RESET
Generator
RESET
(RESET) IMP706P
MR
V
CC
+
+
鈥?/div>
2.63V (IMP708R)
2.93V (IMP708S)
3.08V (IMP708T)
4.00V (IMP708J)
RESET
Generator
RESET
PFI
2.63V (IMP706P/R)
2.93V (IMP706S)
3.08V (IMP706T)
4.00V (IMP706J)
1.25V
+
鈥?/div>
PFO
PFI
1.25V
+
PFO
鈥?/div>
IMP706P/R/S/T/J
GND
706P_01.eps
IMP708R/S/T/J
706P_02.eps
GND
漏
1999 IMP, Inc.
408-432-9100/www.impweb.com
1
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