STM690_10 Datasheet, PDF (1/42 Pages) STMicroelectronics – 3 V supervisor with battery switchover

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) t_rec
■ 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 V_CC = 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
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