Overview
The NCP803SN120T1G is a microprocessor reset supervisory circuit produced by onsemi. This device is part of the NCP803 series, designed to monitor the power supply voltage (VCC) in digital systems and provide a reset signal to the host processor when necessary. It is a cost-effective, 3-pin system supervisor that does not require any external components for operation. The NCP803SN120T1G is optimized for low supply current, making it suitable for battery-powered applications, and it offers robust transient immunity to reject fast transient glitches on the VCC line.
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) | 1.20 | - | - | V |
| Reset Active TimeOut Period | 140 | - | 460 | ms |
| RESET Output Voltage Low (VCC = VTH - 0.2 V, ISINK = 0.5 mA) | - | 0.3 | - | V |
| Operating Junction Temperature Range | -40 | - | 105 | °C |
| Storage Temperature Range | -65 | - | 150 | °C |
| Lead Temperature (Soldering, 10 Seconds) | - | - | 260 | °C |
Key Features
- Precision VCC monitoring for supplies of 1.5 V, 2.5 V, 3.0 V, 3.3 V, and 5.0 V, with additional options available in 100 mV steps from 1.2 V to 4.9 V.
- Low supply current of 0.5 µA (VCC = 3.2 V), making it suitable for battery-powered applications.
- No external components required for operation.
- Open-drain active-low RESET output.
- Four guaranteed minimum power-on reset pulse widths available (1 ms, 20 ms, 100 ms, and 140 ms).
- VCC transient immunity to reject fast transient glitches on the power supply line.
- Wide operating temperature range: -40°C to 105°C.
- Pb-free and RoHS compliant.
Applications
- Computers and embedded systems.
- Battery-powered equipment.
- Critical microprocessor power supply monitoring.
- Systems requiring robust power supply monitoring and reset functionality during power-up, power-down, and brownout/sag conditions.
Q & A
- What is the primary function of the NCP803SN120T1G?
The primary function is to monitor the power supply voltage (VCC) in digital systems and provide a reset signal to the host processor when necessary.
- What is the typical supply current of the NCP803SN120T1G?
The typical supply current is 0.5 µA at VCC = 3.3 V.
- What are the available reset pulse widths for the NCP803SN120T1G?
The available reset pulse widths are 1 ms, 20 ms, 100 ms, and 140 ms.
- Does the NCP803SN120T1G require any external components for operation?
No, it does not require any external components for operation.
- What is the operating temperature range of the NCP803SN120T1G?
The operating temperature range is -40°C to 105°C.
- Is the NCP803SN120T1G Pb-free and RoHS compliant?
Yes, it is Pb-free and RoHS compliant.
- How does the NCP803SN120T1G handle transient glitches on the power supply line?
The device is optimized to reject fast transient glitches on the VCC line, ensuring robust power supply monitoring.
- What is the RESET output configuration of the NCP803SN120T1G?
The RESET output is an open-drain active-low configuration.
- What are some typical applications for the NCP803SN120T1G?
Typical applications include computers, embedded systems, battery-powered equipment, and critical microprocessor power supply monitoring.
- How does the NCP803SN120T1G maintain reset signal integrity during power-down?
The RESET output is valid to VCC = 1.0 V. Below this voltage, the output becomes an open circuit and does not sink current.
