IMP1817
P
OWER
M
ANAGEMENT
Key Features
Low Power, 3.3V/3.0V µP Reset
– Active HIGH, Push-Pull Output
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Improved Dallas DS1817 replacement
— Over 50% lower maximum supply current
The IMP1817 supply voltage monitor is an improved, low-power
replacement for the Dallas Semiconductor DS1817. Maximum supply
current over temperature is a low 15µA, representing over 50 percent
lower power as compared to the DS1817.
Low Supply Current
— 20µA maximum (5.5V)
— 15µA maximum (3.6V)
The IMP1817 issues an active HIGH 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 20-percent. When an out-of-tolerance condition is detected, an
internal power-fail signal is generated which forces an active HIGH reset
signal. After VCC returns to an in-tolerance condition, the reset signal
remains active for 150ms to allow the power supply and system micro-
processor to stabilize.
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Automatically restarts a microprocessor after
power failure
150ms reset delay after VCC returns to an
in-tolerance condition
Active HIGH power-up reset
Precision temperature-compensated voltage
reference and comparator
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
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The IMP1817 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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Other low power products in this family include the IMP1810/11/12/15/16,
IMP1233D and IMP1233M.
Family Selection Guide
Applications
RESET Voltage RESET Time Output RESET
Part
(V)
(ms)
Stage Polarity
◆ Set-top boxes
◆ Cellular phones
◆ PDAs
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
◆ Energy management systems
◆ Embedded control systems
◆ Printers
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
IMP1817
IMP1817
Microprocessor
RESET
+
Delay
150ms
Typical
2
RESET
RESET
–
GND
Reference
3
1817_02.eps
GND
1817_01.eps
©
1999 IMP, Inc.
408-432-9100/www.impweb.com
1
A1PROS [ A1 PROS CO., LTD. ]
