IMP1810
P
OWER
M
ANAGEMENT
Key Features
Low Power, 5V µP Reset
– Active LOW, Push-Pull Output
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Improved Dallas DS1810 replacement
— 50% lower maximum supply current
The IMP1810 supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1810. Maximum supply
current over temperature is a low 20µA, representing 50 percent lower
power as compared to the DS1810.
Low Supply Current
— 20µA maximum (5.5V)
Automatically restarts a microprocessor after
power failure
150ms reset delay after VCC returns to an
in-tolerance condition
Active LOW power-up reset
The IMP1810 issues an active LOW reset signal whenever the monitored
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 150ms to allow the power supply and system microprocessor
to stabilize.
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Precision temperature-compensated voltage
reference and comparator
The IMP1810 is designed with a push-pull output stage and operates
over the extended industrial temperature range. Devices are available in
compact surface mount SOT-23 packages and 3-lead TO-92 packages.
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Eliminates external components
Low-cost TO-92 package
Compact surface mount SOT-23 package
Push-Pull output for minimum current drain
Operating temperature –40°C to +85°C
Other low power products in this family include the IMP1811/12/15/16/17,
IMP1233D and IMP1233M.
Family Selection Guide
Applications
RESET Voltage RESET Time Output RESET
◆ Set-top boxes
◆ Cellular phones
◆ PDAs
◆ Energy management systems
◆ Embedded control systems
◆ Printers
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
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
1
V
CC
Supply
Tolerance
Bias
IMP1810
IMP1810
Microprocessor
RESET
+
2
Delay
150ms Typical
RESET
RESET
–
Reference
GND
3
1810_02.eps
GND
1810_01.eps
©
1999 IMP, Inc.
408-432-9100/www.impweb.com
1
A1PROS [ A1 PROS CO., LTD. ]
