Overview
The CAT809STBI-T is a 3-pin microprocessor power supply supervisor produced by onsemi. This device is designed to provide precision monitoring of power supply voltages, ensuring reliable operation of microprocessors and other digital systems. It is available in compact SOT-23 and SC-70 packages, making it suitable for a wide range of applications where space is limited.
The CAT809STBI-T features a push-pull RESET output that is active LOW, providing a robust reset signal when the power supply voltage falls below the specified threshold. This device is part of the CAT809 series, which includes variations with different output configurations, such as the CAT803 with an open-drain active LOW reset and the CAT810 with a push-pull active HIGH reset.
Key Specifications
| Parameter | Conditions | Min | Typ | Max | Units |
|---|---|---|---|---|---|
| VCC Range | TA = 0°C to +70°C | 1.0 | 5.5 | V | |
| VCC Range | TA = −40°C to +85°C | 1.2 | 5.5 | V | |
| ICC Supply Current | TA = −40°C to +85°C, VCC < 5.5 V | 8 | 20 | μA | |
| ICC Supply Current | TA = −40°C to +85°C, VCC < 3.6 V | 6 | 15 | μA | |
| VTH Reset Threshold Voltage | TA = +25°C, 3.3V Version | 3.04 | 3.08 | 3.11 | V |
| VTH Reset Threshold Voltage | TA = −40°C to +85°C, 3.3V Version | 3.00 | 3.15 | V | |
| TR Reset Active Timeout Period | TA = −40°C to +85°C | 140 | 460 | ms | |
| Operating Temperature Range | −40 | +85 | °C | ||
| Storage Temperature Range | −65 | +105 | °C | ||
| Lead Soldering Temperature (10 sec) | 300 | °C |
Key Features
- Precision Monitoring: The CAT809STBI-T provides precise monitoring of power supply voltages, including +5.0 V, +3.3 V, +3.0 V, and +2.5 V, with various tolerance levels.
- Push-Pull RESET Output: Features a push-pull RESET output that is active LOW, ensuring a robust reset signal.
- Low Power Consumption: The device has a low supply current of 6 μA to 20 μA, depending on the operating conditions.
- Transient Immunity: Protects against short-duration transients on the power supply, ensuring the reset signal remains in the correct state.
- Compact Packages: Available in SOT-23 and SC-70 packages, making it suitable for space-constrained applications.
- Industrial Temperature Range: Operates over an industrial temperature range of −40°C to +85°C.
- Pb-Free and RoHS Compliant: The device is lead-free and compliant with RoHS regulations.
Applications
- Computers, Servers, Laptops: Ideal for power supply monitoring in various computer systems.
- Cable Modems and Wireless Communications: Used in telecommunications equipment to ensure reliable power supply monitoring.
- Embedded Control Systems: Suitable for use in industrial control systems and automation.
- White Goods and Power Meters: Applied in household appliances and power measurement devices.
- Intelligent Instruments and PDAs: Used in smart devices and handheld equipment to monitor power supply conditions.
Q & A
- What is the primary function of the CAT809STBI-T?
The primary function of the CAT809STBI-T is to provide precision monitoring of power supply voltages and generate a reset signal when the voltage falls below a specified threshold.
- What types of packages are available for the CAT809STBI-T?
The CAT809STBI-T is available in SOT-23 and SC-70 packages.
- What is the operating temperature range of the CAT809STBI-T?
The operating temperature range is −40°C to +85°C.
- How does the CAT809STBI-T handle power supply transients?
The device protects against short-duration transients on the power supply, ensuring the reset signal remains in the correct state.
- What is the typical supply current of the CAT809STBI-T?
The typical supply current is 6 μA to 20 μA, depending on the operating conditions.
- Is the CAT809STBI-T Pb-free and RoHS compliant?
- What is the reset active timeout period for the CAT809STBI-T?
The reset active timeout period is between 140 ms and 460 ms.
- How does the CAT809STBI-T ensure the reset output is in a known state when VCC is under 1.0 V?
A pull-down resistor greater than 10 kΩ between the RESET pin and GND is recommended.
- What are some common applications of the CAT809STBI-T?
Common applications include computers, servers, laptops, cable modems, wireless communications, embedded control systems, white goods, power meters, intelligent instruments, and PDAs.
- What is the threshold voltage for the 3.3V version of the CAT809STBI-T?
The threshold voltage for the 3.3V version is between 3.00 V and 3.15 V over the temperature range of −40°C to +85°C.
