STM704RDS6E STMicroelectronics

STM690, STM704, STM795 STM802, STM804, STM805, STM806 3 V supervisor with battery switchover Features RST or RST outputs 8 NVRAM supervisor for external LPSRAM Chip enable gating (STM795 only) for external 1 LPSRAM (7 ns max prop delay) Manual (push-button) reset input SO8 (M) 200 ms (typ) t rec Watchdog timer - 1.6 s (typ) Automatic battery switchover Low battery supply current - 0.4 A (typ) Power-fail comparator (PFI/PFO) Low supply current - 40 A (typ) (1) TSSOP8 3x3 (DS) Guaranteed RST (RST) assertion down to V = 1.0 V CC Operating temperature: 1. Contact local ST sales office for availability. 40 C to 85 C (industrial grade) RoHS compliance Lead-free components are compliant with the RoHS directive Table 1. Device summary Manual Watchdog Active- low Active- high Battery Power-fail Chip enable reset (1) (1) Input RST RST switchover comparator gating input STM690T/S/R STM704T/S/R (2) STM795T/S/R STM802T/S/R (2) STM804T/S/R (2) STM805T/S/R STM806T/S/R 1. All RST outputs push-pull (unless otherwise noted). 2. Open drain output. August 2010 Doc ID 10519 Rev 9 1/42 www.st.com 1Contents STM690, STM704, STM795, STM802, STM804, STM805, STM806 Contents 1 Description . 6 1.1 Pin descriptions . 9 1.1.1 MR (manual reset) 9 1.1.2 WDI (watchdog input) . 9 1.1.3 RST (active-low reset) . 9 1.1.4 RST (active-high reset - open drain) 9 1.1.5 PFI (power-fail input) 9 1.1.6 PFO (power-fail output) 9 1.1.7 V (supply output voltage) 9 OUT 1.1.8 Vccsw (V switch output) 9 CC 1.1.9 E (chip enable input) . 10 1.1.10 E (conditional chip enable) . 10 CON 1.1.11 V (backup battery input) 10 BAT 2 Operation . 14 2.1 Reset output . 14 2.2 Push-button reset input (STM704/806) 14 2.3 Watchdog input (NOT available on STM704/795/806) . 14 2.4 Backup battery switchover 15 2.5 Chip enable gating (STM795 only) 16 2.6 Chip enable input (STM795 only) . 16 2.7 Chip enable output (STM795 only) 16 2.8 Power-fail input/output (NOT available on STM795) 17 2.9 Applications information 17 2.10 Using a SuperCap as a backup power source . 19 2.11 Negative-going V transients . 19 CC 3 Typical operating characteristics . 20 4 Maximum ratings . 30 5 DC and AC parameters 31 2/42 Doc ID 10519 Rev 9