AP1701/2/3/4
3-Pin Microprocessor Reset Circuits
Features
- Precision Monitoring of +3V, +3.3V, and +5V
Power-Supply Voltages
- Fully Specified Over Temperature
- Available in Three Output Configurations
- Push-Pull RESET Low Output (AP1701/3)
- Push-Pull RESET High Output (AP1702/4)
- 140ms min Power-On Reset Pulse Width
- 12碌A Supply Current
- Guaranteed Reset Valid to VCC = +1V
- Power Supply Transient Immunity
- No External Components
- 3-pin SOT23 package
General Description
The AP1701/2/3/4 are used for microprocessor (碌P)
supervisory circuits to monitor the power supplies in
碌P and digital systems. They provide excellent
circuit reliability and low cost by eliminating external
components and adjustments when used with +5V,
+3.3V, +3.0V powered circuits.
These circuits perform a single function: they assert
a reset signal whenever the VCC supply voltage
declines below a preset threshold, keeping it
asserted for at least 140ms after VCC has risen
above the reset threshold. Reset thresholds
suitable for operation with a variety of supply
voltages are available. The AP1701/2/3/4 have
push pull outputs. The AP1701/3 have an active low
RESET output, while the AP1702/4 has an active
high RESET output. The reset comparator is
designed to ignore fast transients on VCC, and the
outputs are guaranteed to be in the correct logic
state for VCC down to 1V. Low supply current
makes the AP1701/2/3/4 ideal for use in portable
equipment. The AP1701/2/3/4 is available in a 3-pin
SOT23 package.
Applications
- Computers
- Controllers
- Intelligent Instruments
- Critical 碌P and 碌C Power Monitoring
- Portable/Battery Powered Equipment
- Automotive
Pin Assignments
(Top View)
Pin Descriptions
Name
GND
Ground
Reset output pin
L: for AP1701/3
H: for AP1702/4
Operating voltage input
Description
GND
1
AP1701
AP1702
3 V
CC
RESET
(RESET)
V
CC
RESET (RESET)
2
SOT-23
(Top View)
RESET (RESET)
1
AP1703
AP1704
2
SOT-23
3 V
CC
GND
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.0
1/8
May. 7, 2004
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