STM1810LWX7F Microprocessor Reset Circuit

The STM1810LWX7F is a sophisticated microprocessor (µP) supervisory circuit designed by STMicroelectronics to monitor power supplies in digital systems. It provides a critical function by asserting a reset to the µP during power-up, power-down, and brown-out conditions, ensuring that the µP starts up in a known state every time.

This device integrates features that make it particularly well-suited for portable and low-power applications. The STM1810LWX7F offers a low supply current, making it an energy-efficient choice for battery-operated devices. Its wide operating voltage range, from 1.65V to 5.5V, allows for flexibility in various system designs and ensures compatibility with a broad range of µPs and digital logic levels.

The reset output of the STM1810LWX7F is guaranteed to be in the correct state for V_CC down to 1.0V, which is particularly beneficial for systems that operate at low voltages. The device also features an active-low reset output, which remains asserted for a fixed timeout period after V_CC has risen above the designated reset threshold level. This ensures that the µP has sufficient time to stabilize before the system begins operation.

Additionally, the STM1810LWX7F is designed with a low threshold accuracy of ±2.5%, which provides a precise monitoring threshold, thereby improving system reliability. Its small package size, available in a 5-lead SOT23, makes it an excellent choice for space-constrained applications.

Key specifications of the STM1810LWX7F include:

• Reset threshold voltages: Multiple options available to match specific system requirements.
• Reset timeout: 140 ms minimum, ensuring the µP is properly reset.
• Operating temperature range: -40°C to +85°C, suitable for industrial environments.
• Low supply current: Ideal for power-sensitive applications.

The STM1810LWX7F is a reliable and efficient solution for system designers looking to enhance the operational stability of their digital systems. Its precision and low power consumption make it an indispensable component in the design of modern electronic devices.