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1 / 34 page 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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