STM1810 STM1811 STM1812 STM1813 STM1815 STM1816 STM1817 STM1818 Low power reset circuit Features Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages Four output configurations: Push-pull, active-high (STM1812,1817) Push-pull, active-low (STM1810,1815) Open-drain, active-low (STM1811,1816) Open-drain, active-low with push-button detect (STM1813,1818) SOT23-3 (WX) Reset pulse width - 100 ms (min.) Low supply current - 4 A (typ.) Guaranteed assertion down to V = 1.0 V CC (0 C to 105 C) Factory-trimmed reset thresholds of 2.55 V, 2.5% reset threshold accuracy: 2.88 V, 3.06 V, 4.37 V, and 4.62 V (typ.) (40 C to 105 C) Power supply transient immunity Available in the SOT23-3 package Push-button/manual reset detect Fully compatible with DS181x and MXD181x (STM1813/1818) products. Operating temperature: 40 C to 105 C Table 1. Device summary Active-low Active-low Active-high Active-low reset 3.3 V/ Order codes 5 V reset reset reset (open-drain, 3.0 V (push-pull) (open-drain) (push-pull) bidirectional, with MR detect) STM1810L/M (1) STM1811L/M STM1812L/M STM1813L/M STM1815T/S/R (1) STM1816T/S/R STM1817T/S/R STM1818T/S/R 1. Active-low RST with internal pull-up resistor. September 2010 Doc ID11464 Rev 8 1/25 www.st.com 1Contents STM1810/1811/1812/1813/1815/1816/1817/1818 Contents 1 Description . 5 1.1 Functional block diagrams . 7 1.2 Pin descriptions . 7 1.2.1 Active-low RST output (push-pull) 7 1.2.2 Active-low RST output (open-drain) . 7 1.2.3 Active-high RST output (push-pull) . 8 1.2.4 Active-low RST output (open-drain with internal 5.5 k pull-up) with manual reset detect . 8 1.2.5 V CC . 8 1.2.6 V SS 8 2 Operation 9 2.1 Reset output 9 2.2 Push-button detect reset (STM1813/1818) 9 2.3 Interfacing to bidirectional microcontrollers (MCUs) . 9 2.4 Negative going V transients 9 CC 2.5 Valid RST output down to V = 0 V 10 CC 3 Typical operating characteristics . 13 4 Maximum rating 17 5 DC and AC parameters 18 6 Package mechanical 20 20 6.1 ECOPACK 7 Part numbering 22 8 Revision history . 24 2/25 Doc ID11464 Rev 8