STM690

STM690, STM704, STM795 STM802, STM804, STM805, STM806 3 V supervisor with battery switchover Features ■ RST or RST outputs ■ NVRAM supervisor for external LPSRAM ■ Chip enable gating (STM795 only) for external LPSRAM (7 ns max prop delay) ■ Manual (push-button) reset input ■ 200 ms (typ) trec ■ Watchdog timer - 1.6 s (typ) ■ Automatic battery switchover ■ Low battery supply current - 0.4 µA (typ) ■ Power-fail comparator (PFI/PFO) ■ Low supply current - 40 µA (typ) ■ Guaranteed RST (RST) assertion down to VCC = 1.0 V ■ Operating temperature: –40 °C to 85 °C (industrial grade) ■ RoHS compliance – Lead-free components are compliant with the RoHS directive 8 1 SO8 (M) TSSOP8 3x3 (DS)(1) 1. Contact local ST sales office for availability. Table 1. Device summary Watchdog Active- low Active- high Input RST(1) RST(1) STM690T/S/R ✓ ✓ STM704T/S/R ✓ STM795T/S/R ✓(2) STM802T/S/R ✓ STM804T/S/R ✓ STM805T/S/R ✓ ✓ ✓(2) ✓(2) STM806T/S/R ✓ 1. All RST outputs push-pull (unless otherwise noted). 2. Open drain output. Manual reset input ✓ ✓ Battery Power-fail Chip enable switchover comparator gating ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ August 2010 Doc ID 10519 Rev 9 1/42 www.st.com 1 Contents Contents STM690, STM704, STM795, STM802, STM804, STM805, STM806 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....