IMP1 233D
P
OWER
M
ANAGEMENT
Low Power, 5V µP Reset
Key Features
N
Improved Dallas DS1233D replacement
— Over 60% lower maximum supply current
N
Low Supply Current
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
N
Automatically restarts a microprocessor after
power failure
N
350ms reset delay after V
CC
returns to an
in-tolerance condition
N
Active LOW power-up reset, 5kΩ internal pull-up
N
Precision temperature-compensated voltage
reference and comparator
N
Eliminates external components
N
Motorola 68xxx and HC16 compatible
N
Compact surface mount SOT-223 package
N
Operating temperature – 40°C to +85°C
– Active LOW, Open-Drain Output
– 350ms Reset Period
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.
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 (V
CC
) 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 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 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.
Family Selection Guide
Part
IMP1810
IMP1811
IMP1812
IMP1815
IMP1816
IMP1817
IMP1233D
IMP1233M
Applications
Output
Stage
Push-Pull
Open-Drain
Push-Pull
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
RESET Voltage RESET Time
(V)
(ms)
4.620,
4.620,
4.620,
3.060,
3.060,
3.060,
4.625,
4.625,
4.370,
4.350,
4.350,
2.880,
2.880,
2.880,
4.375,
4.375,
4.120
4.130
4.130
2.550
2.550
2.550
4.125
2.720
150
150
150
150
150
150
350
350
RESET
Polarity
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
N
N
N
N
N
N
N
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
IMP1233D
+
–
Delay
350ms Typical
5.0k
9
IMP1233D
RESET
RESET
Microprocessor
RESET
Reference
GND
GND
2000 © IMP, Inc.
1233D_02.eps
1233D_01.eps
408-432-9100/www.impweb.com
1
IMP [ IMP, INC ]
