STM690A_10 Datasheet, PDF (1/43 Pages) STMicroelectronics – 5 V supervisor with battery switchover

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
■ Chip-enable gating (STM818 only) for external
LPSRAM (7 ns max prop delay)
■ RST and RST outputs
■ 200 ms (typ) t_rec
■ Watchdog timer - 1.6 sec (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 3 x 3 (DS)⁽¹⁾
1. Contact local ST sales office for availability.
Table 1. Device summary
Part number
Watchdog
input
Active-low Active-
RST⁽¹⁾ high RST
Manual
reset
input⁽¹⁾
Battery
switch-
over
Power-fail
comparator
STM690A
✓
STM692A
✓
STM703
STM704
STM802L/M
✓
STM805L
✓
STM817L/M
✓
STM818L/M
✓
STM819L/M
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
✓
1. All RST and RST outputs are push-pull.
Chip-
enable
gating
✓
Battery
freshness
seal
✓
✓
✓
August 2010
Doc ID 10522 Rev 10
1/43
www.st.com
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