STM690A, STM692A, STM703 STM704, STM802, STM805, STM817/8/9 5 V supervisor with battery switchover Features 5 V operating voltage NVRAM supervisor for external LPSRAM 8 Chip-enable gating (STM818 only) for external LPSRAM (7 ns max prop delay) 1 RST and RST outputs 200 ms (typ) t rec Watchdog timer - 1.6 sec (typ) SO8 (M) Automatic battery switchover Low battery supply current - 0.4 A (typ) Power-fail comparator (PFI/PFO) Low supply current - 40 A (typ) Guaranteed RST (RST) assertion down to V = 1.0 V CC Operating temperature: (1) TSSOP8 3 x 3 (DS) 40 C to +85 C (industrial grade) RoHS compliance Lead-free components are compliant with the RoHS directive 1. Contact local ST sales office for availability. Table 1. Device summary Manual Battery Chip- Battery Watchdog Active-low Active- Power-fail Part number reset switch- enable freshness (1) input RST high RST comparator (1) input over gating seal STM690A STM692A STM703 STM704 STM802L/M STM805L STM817L/M STM818L/M STM819L/M 1. All RST and RST outputs are push-pull. August 2010 Doc ID 10522 Rev 10 1/43 www.st.com 1Contents STM690A/692A/703/704/802/805/817/818/819 Contents 1 Description . 6 1.1 Pin descriptions . 8 1.1.1 MR 8 1.1.2 WDI . 8 1.1.3 RST . 8 1.1.4 RST . 8 1.1.5 V OUT 9 1.1.6 V BAT . 9 1.1.7 E . 9 1.1.8 E CON 9 1.1.9 PFI 9 1.1.10 PFO . 9 2 Operation . 13 2.1 Reset output . 13 2.2 Push-button reset input (STM703/704/819) . 13 2.3 Watchdog input (NOT available on STM703/704/819) . 13 2.4 Backup battery switchover 14 2.5 Chip-enable gating (STM818 only) 15 2.6 Chip-enable input (STM818 only) . 15 2.7 Chip-enable output (STM818 only) . 15 2.8 Power-fail input/output (NOT available on STM818) 16 2.9 Applications information 16 2.10 Using a SuperCap as a backup power source . 17 2.11 Negative-going V transients . 18 CC 2.12 Battery freshness seal (STM817/818/819) 19 3 Typical operating characteristics . 20 4 Maximum ratings . 31 5 DC and AC parameters 32 2/43 Doc ID 10522 Rev 10