STM812

Features ■ Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages ■ Two output configurations – Push-pull RST output (STM809/811) – Push-pull RST output (STM810/812) ■ 140 ms reset pulse width (min) ■ Low supply current - 6 µA (typ) ■ Guaranteed RST/RST assertion down to VCC = 1.0 V ■ Operating temperature: –40 °C to 85 °C (industrial grade) ■ Lead-free, small SOT23 and SOT143 package STM809, STM810 STM811, STM812 Reset circuit SOT23-3 (WX) SOT143-4 (W1) Table 1. Device summary Active-low reset STM809 ✔ STM810 STM811 STM812 ✔ Active-high reset Manual reset input ✔ ✔ ✔✔ Package SOT23-3 SOT23-3 SOT143-4 SOT143-4 January 2010 Doc ID 9873 Rev 5 1/21 www.st.com 1 Contents Contents STM809/810/811/812 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.1 Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.2 Push-button reset input (STM811/812) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.3 Negative-going VCC transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2.4 Valid RST output down to VCC = 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 3 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4 Maximum ratings . . . . . . . . ...