IMP1233M
P
OWER
M
ANAGEMENT
Key Features
Low Power, 5V/3.0V µP Reset
– Active LOW, Open-Drain Output
– 350ms Reset Period
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Improved Dallas DS1233M replacement
— 60% lower maximum supply current
Low Supply Current
The IMP1233M supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1233M. Maximum supply
current over temperature is a low 20µA, representing 60 percent lower
power as compared to the DS1233M.
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
Automatically restarts a microprocessor after
power failure
350ms reset delay after VCC returns to an
in-tolerance condition
Active LOW power-up reset, 5kΩ internal pull-up
Precision temperature-compensated voltage
reference and comparator
Eliminates external components
Pin function compatible with the Motorola
MC33064, MC34064, MC33164 and MC34164
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The IMP1233M issues an active LOW reset signal whenever the moni-
tored supply is out-of-tolerance. A precision reference and comparator
circuit monitor power supply (VCC) level. Tolerance level options are
5- and 10-percent for a 5V power supply. The tolerance is 15-percent for
the 3.3V, IMP1233M. When an out-of-tolerance condition is detected, an
internal power-fail signal is generated which forces an active LOW reset
signal. After VCC returns to an in-tolerance condition, the reset signal
remains active for 350ms to allow the power supply and system micro-
processor to stabilize.
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The IMP1233M is designed with a open-drain output stage and operates
over the extended industrial temperature range. Devices are available in
the compact surface mount SO-8 package.
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Motorola 68xxx and HC16 compatible
Compact surface mount SO-8 package
Operating temperature –40°C to +85°C
Other low power products in this family include the IMP1810/11/12/15/
16/17 and IMP1233D.
Family Selection Guide
Applications
RESET Voltage RESET Time Output RESET
ꢀ Set-top boxes
Part
(V)
(ms)
Stage Polarity
ꢀ Cellular phones
ꢀ PDAs
ꢀ Energy management systems
ꢀ Embedded control systems
ꢀ Printers
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
4.620, 4.370, 4.120
4.620, 4.350, 4.130
4.620, 4.350, 4.130
3.060, 2.880, 2.550
3.060, 2.880, 2.550
3.060, 2.880, 2.550
150
150
150
150
150
150
350
350
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
IMP1233D 4.625, 4.375, 4.125
IMP1233M 4.625, 4.375, 2.720
Open-Drain
Open-Drain
ꢀ Single board computers
Block Diagram
Typical Application
VCC
V
CC
Supply
Tolerance
Bias
5.0k
IMP1233M
IMP1233M
RESET
Microprocessor
RESET
+
Delay
350ms Typical
RESET
GND
–
Reference
1233M_02.eps
GND
1233M_01.eps
2000 © IMP, Inc.
408-432-9100/www.impweb.com
1
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