IMP1812
P
OWER
M
ANAGEMENT
Key Features
Low Power, 5V µP Reset
– Active HIGH, Push-Pull Output
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◆
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◆
Improved Dallas DS1812 replacement
— Over 50% lower maximum supply current
Low Supply Current
µ
— 20µA maximum (5.5V)
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
◆
◆
◆
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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
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
IMP1812
IMP1812
Microprocessor
RESET
+
Delay
150ms
Typical
2
RESET
RESET
–
GND
Reference
3
1812_02.eps
GND
1812_01.eps
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A1PROS [ A1 PROS CO., LTD. ]
