MCP809T-270I/TT

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The MCP809T-270I/TT is an active reset supervisor for use in microprocessor and digital systems. Manufactured by Microchip, it is a three-terminal supervisory circuit that monitors the supply voltages for microprocessor and other digital system circuits. The MCP809T-270I/TT is the ultimate solution when it comes to single-chip reset circuits that provide wide threshold accuracy and fast response to keep digital systems safely operating. It is designed to protect against system reset due to low supply voltage, high supply voltage, undershoot, overshoot and/or brownouts.

The MCP809T-270I/TT falls into the type of PMIC, or Power Management ICs, known as Supervisors. PMICs are integrated circuits that provide a combination of power supply and power management functions. Supervisors are a type of PMIC that are responsible for monitoring and controlling reset of a micro-controller unit (MCU). The MCP809T series is an active reset supervisor that offers simple implementation and wide range of features. It has a fixed voltage threshold and manual reset option, which makes it ideal for multi-voltage applications. It also provides auto-reset one-shot, manual reset and two-stage reset modes for a wide range of applications.

The MCP809T-270I/TT provides a choice of two fixed thresholds. The 0.85V reset threshold is designed for MCUs with supply voltages up to 0.9V. The 1.97V reset threshold is designed for MCUs with supply voltages up to 2.7V. The 0.1V hysteresis gives improved noise immunity and allows for a wider range of digital operation including very fast rising edges without resetting the system. The device features a push-button manual reset input that forces a reset pulse on the reset output.

The MCP809T-270I/TT is specifically designed to monitor power supply levels in applications such as automotive, computer, consumer electronics, and industrial markets. Its features include push-button manual reset, wide operational voltage range, low operating and static current, low active voltage thresholds, and 25mA active discharge circuit. Its extremely low active voltage thresholds make it ideal for applications that require low-noise and low supply voltages, while its active discharge feature ensures that the reset signal is maintained during supply voltage transitions.

The MCP809T-270I/TT operates by monitoring the supply voltage to the MCU. When the supply voltage to the MCU falls below the reset threshold, the reset output is asserted for 15μs. The reset output remains active for at least 10ms after the voltage to the MCU returns to a valid level. This ensures the system Power on Reset is not missed, even if the supply voltage returns to a valid level very quickly.

In addition, the MCP809T-270I/TT features a dual-stage reset feature which provides a reset as soon as the supply voltage falls below the active voltage threshold. This allows the system to reset quickly and to recover quickly following any system disturbances. The reset output stays asserted for at least 10mS and then the supervisor shuts off the reset output as soon as the supply voltage rises above the active threshold.

The MCP809T-270I/TT is suitable for a wide range of applications. In automotive, it can be used to protect microcontrollers from brownouts and other power problems. In industrial applications, it can be used to monitor power supply levels and reset the system if they fall below the specified levels. It can also be used in computer and consumer electronics applications, such as motherboards, power supply circuits and mobile phones.

In summary, the MCP809T-270I/TT is a three-terminal supervisory circuit (PMIC) that monitors the supply voltage to microcontroller or other digital systems. It is suitable for a wide range of applications ranging from automotive to computer and consumer electronics. Its features include fixed voltage thresholds, manual reset and dual-stage reset, low operating and static current, push-button manual reset and 25mA active discharge. All these features make it the ultimate solution when it comes to single-chip reset circuits that provide wide threshold accuracy and fast response.

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