NCP302, NCP303
Voltage Detector Series
with Programmable Delay
The NCP302 and NCP303 series are second generation ultra−low
current voltage detectors that contain a programmable time delay
generator. These devices are specifically designed for use as reset
controllers in portable microprocessor based systems where extended
battery life is paramount.
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Each series features a highly accurate undervoltage detector with
hysteresis and an externally programmable time delay generator. This
combination of features prevents erratic system reset operation.
The NCP302 series consists of complementary output devices that
are available with either an active high or active low reset. The
NCP303 series has an open drain N−Channel output with an active low
reset output.
5
1
THIN SOT23−5/TSOP−5/SC59−5
CASE 483
Features
PIN CONNECTIONS AND
MARKING DIAGRAM
• Quiescent Current of 0.5 mA Typical
• High Accuracy Undervoltage Threshold of 2.0%
• Externally Programmable Time Delay Generator
• Wide Operating Voltage Range of 0.8 V to 10 V
• Complementary or Open Drain Output
• Active Low or Active High Reset
Reset
Output
1
2
3
5
C
D
Input
4
N.C.
Ground
• Pb−Free Packages are Available
(Top View)
xxx =Specific Device Code
Typical Applications
Y
= Year
• Microprocessor Reset Controller
• Low Battery Detection
W
= Work Week
• Power Fail Indicator
• Battery Backup Detection
ORDERING INFORMATION
See detailed ordering and shipping information in the ordering
information section on page 22 of this data sheet.
NCP303LSNxxT1
NCP302xSNxxT1
Open Drain Output Configuration
Complementary Output Configuration
2
Input
1
Reset Output
2
Input
R
R
D
D
1
Reset
Output
*
V
ref
V
ref
3
GND
5
C
D
3
GND
5
C
D
* Inverter for active low devices.
* Buffer for active high devices.
This device contains 28 active transistors.
Figure 1. Representative Block Diagrams
Semiconductor Components Industries, LLC, 2005
1
Publication Order Number:
January, 2005 − Rev. 14.5
NCP302/D