Overview
The NCP803SN308T1 is a system supervisor circuit designed by onsemi, optimized for monitoring the VCC voltage in digital systems and providing a reset signal to the host processor when necessary. This device is part of the NCP803 series, known for its low supply current and precision voltage monitoring capabilities, making it suitable for battery-powered applications and other systems requiring reliable power supply monitoring.
Key Specifications
| Characteristic | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC Range | 1.0 | - | 5.5 | V |
| Supply Current (VCC = 3.3 V) | - | 0.5 | 1.2 | μA |
| Reset Voltage Threshold (VTH) | 3.08 | - | - | V |
| Reset Active TimeOut Period | 20 | - | 460 | ms |
| RESET Output Voltage Low (VCC = VTH - 0.2 V, ISINK = 0.5 mA) | - | 0.3 | - | V |
| Operating Temperature | -40 | - | 105 | °C |
| Package Type | - | - | SOT-23 (TO-236) | - |
Key Features
- Precision VCC Monitor for 1.5 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V Supplies
- Precision Monitoring Voltages from 1.2 V to 4.9 V Available in 100 mV Steps
- Four Guaranteed Minimum Power-On Reset Pulse Width Available (1 ms, 20 ms, 100 ms, and 140 ms)
- RESET Output Guaranteed to VCC = 1.0 V
- Low Supply Current of 0.5 μA (VCC = 3.2 V)
- VCC Transient Immunity to Reject Fast Transient Glitches
- No External Components Required
- Wide Operating Temperature: -40°C to 105°C
- Pb-Free and RoHS Compliant
Applications
- Computers
- Embedded Systems
- Battery Powered Equipment
- Critical Microprocessor Power Supply Monitoring
Q & A
- What is the primary function of the NCP803SN308T1?
The primary function of the NCP803SN308T1 is to monitor the VCC voltage in digital systems and provide a reset signal to the host processor when the voltage falls below a specified threshold.
- What is the typical supply current of the NCP803SN308T1 at VCC = 3.3 V?
The typical supply current is 0.5 μA at VCC = 3.3 V.
- What are the available reset timeout periods for the NCP803SN308T1?
The available reset timeout periods are 20 ms, 100 ms, and 140 ms.
- What is the operating temperature range of the NCP803SN308T1?
The operating temperature range is -40°C to 105°C.
- Is the NCP803SN308T1 Pb-Free and RoHS compliant?
- What package types are available for the NCP803SN308T1?
The device is available in SOT-23 (TO-236) packages.
- How does the NCP803SN308T1 handle transient glitches on the VCC line?
The device has built-in VCC transient immunity to reject fast transient glitches on the power supply line.
- Are external components required for the NCP803SN308T1 to function?
No, external components are not required for the NCP803SN308T1 to function.
- What is the reset voltage threshold for the NCP803SN308T1?
The reset voltage threshold (VTH) for the NCP803SN308T1 is 3.08 V.
- How long does the reset output remain active after VCC rises above the reset threshold?
The reset output remains active for a timeout period, which can be 20 ms, 100 ms, or 140 ms depending on the device variant.
