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STM802 Dataheets PDF



Part Number STM802
Manufacturers ST Microelectronics
Logo ST Microelectronics
Description 3V Supervisor
Datasheet STM802 DatasheetSTM802 Datasheet (PDF)

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) asserti.

  STM802   STM802


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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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.1.1 MR (manual reset) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.1.2 1.1.3 WDI (watchdog input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 RST (active-low reset) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.1.4 1.1.5 1.1.6 RST (active-high reset - open drain) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 PFI (power-fail input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 PFO (power-fail output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 1.1.7 1.1.8 1.1.9 1.1.10 1.1.11 VOUT (supply output voltage) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Vccsw (VCC switch output) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 E (chip enable input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ECON (conditional chip enable) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 VBAT (backup battery input) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 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 VCC transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 3 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 5 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 2/42 Doc ID 10519 Rev 9 STM690, STM704, STM795, STM802, STM804, STM805, STM806 Contents 6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39 8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41 Doc ID 10519 Rev 9 3/42 List of tables List of tables STM690, STM704, STM795, STM802, STM804, STM805, STM806 Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Table 11. Table 12. Device summary . . . . . . . . . ..


STM795 STM802 STM804


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