Overview
The MAX803SQ263T1G is a microprocessor reset supervisory circuit designed and manufactured by onsemi. This device is part of the MAX803/NCP803 series, which is optimized for monitoring power supplies in digital systems and providing a reset signal to the host processor when necessary. It is a cost-effective, 3-pin system supervisor that requires no external components for operation. The MAX803SQ263T1G is particularly suited for applications requiring low supply current and high precision in voltage 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) | - | 2.63 | - | V |
| Reset Active TimeOut Period | 140 | - | 460 | ms |
| Operating Junction Temperature Range | -40 | - | 105 | °C |
| Storage Temperature Range | -65 | - | 150 | °C |
| Lead Temperature (Soldering, 10 Seconds) | - | - | 260 | °C |
| ESD Protection (Human Body Model) | - | - | 2000 | V |
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 thresholds 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 precise voltage monitoring and reset signals during power-up, power-down, and brownout/sag conditions.
Q & A
- What is the primary function of the MAX803SQ263T1G?
The primary function is to monitor the power supply voltage (VCC) in digital systems and provide a reset signal to the host processor when the voltage falls below a specified threshold.
- What are the available reset timeout periods for the MAX803SQ263T1G?
The available reset timeout periods are 1 ms, 20 ms, 100 ms, and 140 ms, with the specific model offering a range of 140-460 ms.
- What is the typical supply current of the MAX803SQ263T1G?
The typical supply current is 0.5 μA at VCC = 3.2 V.
- What are the operating temperature ranges for the MAX803SQ263T1G?
The operating junction temperature range is -40°C to 105°C, and the storage temperature range is -65°C to 150°C.
- Is the MAX803SQ263T1G Pb-free and RoHS compliant?
Yes, the device is Pb-free and RoHS compliant.
- What type of output does the MAX803SQ263T1G have?
The device has an open-drain active-low RESET output.
- How does the MAX803SQ263T1G handle transient glitches on the power supply line?
The device is designed to reject fast transient glitches on the VCC line, ensuring stable operation during power-up, power-down, and brownout/sag conditions.
- What are the package options for the MAX803SQ263T1G?
The device is available in SOT-23 and SC-70 packages.
- What is the reset voltage threshold for the MAX803SQ263T1G?
The reset voltage threshold (VTH) for this specific model is 2.63 V.
- How does the MAX803SQ263T1G ensure signal integrity during power-down?
The RESET output is valid down to VCC = 1.0 V. Below this voltage, the output becomes an open circuit and does not sink current.
