IMP1 233M
P
OWER
M
ANAGEMENT
Low Power, 5V/3.0V µP Reset
Key Features
x
Improved Dallas DS1233M replacement
— 60% lower maximum supply current
x
Low Supply Current
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
x
Automatically restarts a microprocessor after
power failure
x
350ms reset delay after V
CC
returns to an
in-tolerance condition
x
Active LOW power-up reset, 5kΩ internal pull-up
x
Precision temperature-compensated voltage
reference and comparator
x
Eliminates external components
x
Pin function compatible with the Motorola
MC33064, MC34064, MC33164 and MC34164
x
Motorola 68xxx and HC16 compatible
x
Low-cost TO-92 package
x
Compact surface mount SO-8 package
x
Operating temperature – 40°C to +85°C
– Active LOW, Open-Drain Output
– 350ms Reset Period
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.
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 (V
CC
) 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 V
CC
returns to an in-tolerance condition, the reset signal
remains active for 350ms to allow the power supply and system micro-
processor to stabilize.
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 and a 3-lead TO-92 package.
Other low power products in this family include the IMP1810/11/12/15/
16/17 and IMP1233D.
Family Selection Guide
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
RESET Voltage RESET Time
(V)
(ms)
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
4.625, 4.375, 4.125
4.625, 4.375, 2.720
150
150
150
150
150
150
350
350
Output
Stage
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
RESET
Polarity
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
Applications
x
x
x
x
x
x
x
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
Single board computers
Block Diagram
V
CC
VCC
Supply
Tolerance
Bias
Typical Application
IMP1233M
+
–
Delay
350ms Typical
5.0kΩ
IMP1233M
RESET
RESET
Microprocessor
RESET
Reference
GND
GND
1233M_02.eps
1233M_01.eps
©
1999 IMP, Inc.
408-432-9100/www.impweb.com
1
A1PROS [ A1 PROS CO., LTD. ]
