ON Semiconductor NCP803 Data Sheet - Very Low Supply Current 3-Pin Microprocessor Reset Monitor User's Guide
Summary
The NCP803 is a precision system supervisor circuit designed to monitor digital supply voltages and provide reliable reset signaling for host microprocessors. This low-quiescent current device ensures system stability by detecting voltage droops, making it ideal for battery-powered and embedded applications. The accompanying manual provides comprehensive details on specific threshold adjustments (2.5V to 5.0V), recovery timing specifications, operating ranges, and robust transient immunity. It is essential for designers building computers, industrial controls, or any critical system requiring reliable microprocessor power monitoring.
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NCP803
Very Low Supply Current 3−Pin Microprocessor Reset Monitor The NCP803 is a cost-effective system supervisor circuit designed to monitor VCC in digital systems and provide a reset signal to the host http://onsemi.com processor when necessary. No external components are required. The reset output is driven active within 10 µsec of VCC falling MARKING through the reset voltage threshold. Reset is maintained active for a DIAGRAM minimum of 140 msec after VCC rises above the reset threshold. The NCP803 has an open drain active-low RESET output. The output of
SOT-23
the NCP803 is guaranteed valid down to VCC = 1.0 V and is available (TO-236) xxx M
in a SOT-23 package. CASE 318
The NCP803 is optimized to reject fast transient glitches on the VCC line. Low supply current of 1.0 µA (VCC = 3.2 V) make this device
xxx = Specific Device Code
suitable for battery powered applications.
= Monthly Date Code
Features Precision VCC Monitor for 2.5 V, 3.0 V, 3.3 V, and 5.0 V Supplies
PIN CONFIGURATION
Precision Monitoring Voltages from 1.6 V to 4.9 V Available in 100 m V Steps
140 msec Guaranteed Minimum RESET Output Duration RESET Output Guaranteed to VCC = 1.0 V
Low 1.0 µA Supply Current VCC Transient Immunity
RESET
Small SOT-23 Package No External Components
SOT-23*
Wide Operating Temperature: -40°C to 105°C
(Top View)
Typical Applications
NOTE: *SOT-23 is equivalent to JEDEC (TO-236)
Computers Embedded Systems
ORDERING INFORMATION
Battery Powered Equipment Critical µP Power Supply Monitoring Device Package Shipping
NCP803SNxxx T1 SOT-23 3000/Tape & Reel
NOTE: The “xxx” denotes a suffix for Vcc voltage threshold VCC options - see page 6 for more details.
Rpull- up
NCP803 µP
C = 100 n F DEVICE MARKING INFORMATION
RESET RESET See general marking information in the device marking
section on page 6 of this data sheet.
GND GND
Figure 1. Typical Application Diagram
Semiconductor Components Industries, LLC, 2003 Publication Order Number: May, 2003 - Rev. 4 NCP803/D
Page Summary Contents For ON Semiconductor NCP803 Data Sheet - Very Low Supply Current 3-Pin Microprocessor Reset Monitor User's Guide
Manual Details
| Brand | Current |
|---|---|
| Pages | 8 |
| File Size | 57.42 KB |
| Published | May 28, 2026 |
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Frequently Asked Questions
Can the NCP803 be used without additional components for installation?
No external components are required to implement this system supervisor circuit.
Is this device suitable for portable or battery-powered equipment?
Yes, its low supply current of 1.0 μA (at V = 3.2 V) makes it highly suitable.
What range of temperatures can the NCP803 operate in?
The wide operating temperature range is -40°C to 105°C.
How does the circuit ensure a stable reset signal after voltage recovery?
Reset is maintained active for a minimum of 140 msec after V rises above the reset threshold.