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August 2008
Rev 5
1/35
1
STM1403
3 V FIPS-140
security supervisor with battery switchover
Features
STM1403 supports FIPS-140 security level 3+
–Four high-impedance physical tamper
inputs
– Over/under operating voltage detector
– Security alarm (SAL) on tamper detection
Supervisory functions
– Automatic battery switchover
–RST output (open drain)
– Manual (push-button) reset input (MR)
– Power-fail comparator (PFI/PFO)
Vccsw (VCC switch output)
– Low when switched to VCC
– High when switched to VBAT (BATT ON
indicator)
Battery low voltage detector (power-up)
Optional VREF (1.237 V)
– (Available for STM1403A only)
Low battery supply current (2.8 µA, typ)
Secure low profile 16-pin, 3 x 3 mm, QFN
package
QFN16, 3 mm x 3 mm (Q)
Table 1.
Device summary
Device
Standard
supervisory
functions(1)
Physical
tamper
inputs
Over/under
voltage
alarms
VREF
(1.237 V)
option
VOUT status,
during alarm
Vccsw status,
during alarm
STM1403A
✔✔
ON
Normal mode(2)
STM1403B(3)
✔✔
Note(4)
High-Z
High
STM1403C
✔✔
Note(4)
Ground
High
1.
Reset output, power-fail comparator, battery low detection (SAL, RST, PFO, and BLD are open drain).
2.
Normal mode: low when VOUT is internally switched to VCC and high when VOUT is internally switched to battery.
3.
Contact local ST sales office for availability.
4.
Pin 9 is the VREF pin for STM1403A. It is the VTPU pin for STM1403B/C.
www.st.com


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