This document describes the features of STM809, STM810, STM811, and STM812 reset circuits, including precision monitoring of 3V, 3.3V, and 5V supply voltages, two output configurations, low supply current, guaranteed RST/RST assertion down to VCC = 1.0V, etc.
The STM809/810/811/812 are low-power supervisory devices designed to monitor power supplies for microprocessors. They assert a reset signal when the supply voltage drops below a preset threshold and maintain the reset until the voltage rises above the threshold for a minimum period. The STM811 and STM812 variants additionally include a push-button reset input (MR) for manual system resets.
| Supply voltages monitored | 3 V, 3.3 V, and 5 V |
|---|---|
| Reset pulse width (min) | 140 ms |
| Supply current (typ) | 6 µA |
| Operating temperature range | -40 °C to 85 °C |
| Package types | SOT23-3 and SOT143-4 |
| Valid RST output voltage | Down to 1.0 V |
The minimum reset pulse width is 140 ms.
The STM811 and STM812 models provide a push-button reset input (MR).
The typical supply current is 6 µA.