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STM1404_08 Datasheet, PDF (1/35 Pages) STMicroelectronics – 3 V FIPS-140 security supervisor with battery switchover | |||
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STM1404
3 V FIPS-140
security supervisor with battery switchover
Features
â STM1404 supports FIPS-140 security level 4
â Four high-impedance physical tamper
inputs
â Over/under operating voltage detector
â Security alarm (SAL) on tamper detection
â Over/under operating temperature detector
â Over/under temperature thresholds are
customer-selectable and factory-
programmed
â Supervisory functions
â Automatic battery switchover
â RST output (open drain)
â Manual (push-button) reset input (MR)
â Power-fail comparator (PFI/PFO)
â Vccsw (VCC switch output)
â Low when switched to VCC
â High when switched to VBAT (BATT ON
indicator)
â Battery low voltage detector (power-up)
QFN16, 3 mm x 3 mm (Q)
â Optional VREF (1.237 V)
â (Available for STM1404A only)
â Low battery supply current (5.3 µA typ)
â Secure low profile 16-pin, 3 x 3 mm, QFN
package
â RoHS compliance
â Lead-free components compliant with the
RoHS directive
Table 1. Device summary
Device
Standard
supervisory
functions(1)
Physical
tamper
inputs
Over/under
voltage
alarms
Over/under VREF
temperature (1.237 V)
alarms option
VOUT status,
during alarm
Vccsw status,
during alarm
STM1404A
â
STM1404B(3)
â
STM1404C
â
â
â
â
â
â
â
â
â
ON
Normal mode(2)
â
Note(4)
High-Z
High
â
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 STM1404A. It is the VTPU pin for STM1404B/C.
August 2008
Rev 5
1/36
www.st.com
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