IMP811 Datasheet, PDF (1/8 Pages) IMP, Inc – 4-pin μP Voltage Supervisor with Manual Reset

IMP811, IMP812
POWER MANAGEMENT
4-Pin µP Voltage Supervisor
with Manual Reset
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.
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
that is guaranteed to be in the correct state for V_CC down to 1.1V. The
IMP812 has an active-high output RESET. The reset comparator is
designed to ignore fast transients on V_CC .
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.
Six voltage thresholds are available to support 3V to 5V systems:
Reset Threshold
Suffix
Voltage (V)
L
4.63
M
4.38
J
4.00
T
3.08
S
2.93
R
2.63
Key Features
N Improved Maxim MAX811/MAX812 replacement
— Specified to 105°C
— New 4.0V threshold option
N 6µA supply current
N Monitor 5V, 3.3V and 3V supplies
N Manual reset input
N 140ms min. reset pulse width
N Guaranteed over temperature
N Active-LOW reset valid with 1.1V supply
(IMP811)
N Small 4-pin SOT-143 package
N No external components
N Power-supply transient-immune design
Applications
N Computers and controllers
N Embedded controllers
N Battery operated systems
N Intelligent instruments
N Wireless communication systems
N PDAs and handheld equipment
Block Diagrams
VCC
VCC
IMP811
(IMP812)
Manual
Reset
MR
RESET
(RESET)
GND
VCC
µC or µP
RESET
Input
GND
811/12_01.eps
© 1999 IMP, Inc.
408-432-9100/www.impweb.com
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