IMP1233D
P
OWER
M
ANAGEMENT
Key Features
Low Power, 5V µP Reset
– Active LOW, Open-Drain Output
– 350ms Reset Period
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Improved Dallas DS1233D replacement
— Over 60% lower maximum supply current
Low Supply Current
The IMP1233D supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1233D. Maximum supply
current over temperature is a low 20µA, representing over 60 percent
lower power as compared to the DS1233D.
— 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
Motorola 68xxx and HC16 compatible
Compact surface mount SOT-223 package
Operating temperature –40°C to +85°C
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The IMP1233D 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-,
10- and 15-percent. 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 IMP1233D is designed with a open-drain output stage and operates
over the extended industrial temperature range. Devices are available in
compact surface mount SOT-223 packages.
Other low power products in this family include the IMP1810/11/12/15/
16/17 and IMP1233M.
Applications
Family Selection Guide
ꢀ Set-top boxes
ꢀ Cellular phones
ꢀ PDAs
ꢀ Energy management systems
ꢀ Embedded control systems
ꢀ Printers
RESET Voltage RESET Time Output RESET
Part
(V)
(ms)
Stage Polarity
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
ꢀ Single board computers
IMP1233D 4.625, 4.375, 4.125
IMP1233M 4.625, 4.375, 2.720
Open-Drain
Open-Drain
Block Diagram
Typical Application
VCC
V
CC
Supply
Tolerance
Bias
5.0k
IMP1233D
IMP1233D
RESET
Microprocessor
RESET
+
Delay
350ms Typical
RESET
GND
–
Reference
1233D_02.eps
GND
1233D_01.eps
2000 © IMP, Inc.
408-432-9100/www.impweb.com
1
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