IMP811, IMP812
P
OWER
M
ANAGEMENT
Key Features
4-Pin µP Voltage Supervisor
with Manual Reset
ꢀ
Improved Maxim MAX811/MAX812 replacement
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—
Specified to 105°C
New 4.0V threshold option
The IMP811/IMP812 are low-power supervisors designed to monitor
voltage levels of 3.0V, 3.3V and 5.0V power supplies in low-power
microprocessor (µP), microcontroller (µC) and digital systems. Each fea-
tures a debounced manual reset input. The IMP811/812 are improved
drop-in replacements for the Maxim MAX811/812 with extended
temperature specifications to 105°C.
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6µA supply current
Monitor 5V, 3.3V and 3V supplies
Manual reset input
140ms min. reset pulse width
Guaranteed over temperature
A reset signal is issued if the power supply voltage drops below a preset
threshold and is asserted for at least 140ms after the supply has risen
above the reset threshold. The IMP811 has an active-low output RESET
Active-LOW reset valid with 1.1V supply
(IMP811)
that is guaranteed to be in the correct state for V down to 1.1V. The
CC
IMP812 has an active-high output RESET. The reset comparator is
designed to ignore fast transients on V
.
CC
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Small 4-pin SOT-143 package
No external components
Low power consumption makes the IMP811/IMP812 ideal for use in
portable and battery-operated equipment. Available in a compact 4-pin
SOT143 package, the devices use minimal board space.
Power-supply transient-immune design
Six voltage thresholds are available to support 3V to 5V systems:
Applications
Reset Threshold
Suffix
Voltage (V)
ꢀ Computers and controllers
ꢀ Embedded controllers
ꢀ Battery operated systems
ꢀ Intelligent instruments
ꢀ Wireless communication systems
ꢀ PDAs and handheld equipment
L
M
J
4.63
4.38
4.00
3.08
2.93
2.63
T
S
R
Block Diagrams
V
CC
V
CC
IMP811
(IMP812)
V
CC
µC or µP
RESET
Input
MR
RESET
(RESET)
Manual
Reset
GND
GND
811/12_01.eps
©
1999 IMP, Inc.
408-432-9100/www.impweb.com
1
IMP [ IMP, INC ]
