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M41ST87WMX6 Datasheet(PDF) 1 Page - STMicroelectronics |
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M41ST87WMX6 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 42 page 1/42 March 2006 M41ST87Y M41ST87W 5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC and NVRAM Supervisor with Tamper Detection Rev 6 FEATURES SUMMARY ■ 5.0, 3.3, OR 3.0V OPERATING VOLTAGE ■ SERIAL INTERFACE SUPPORTS I2C BUS (400kHz) ■ NVRAM SUPERVISOR FOR EXTERNAL LPSRAM ■ 2.5 TO 5.5V OSCILLATOR OPERATING VOLTAGE ■ AUTOMATIC SWITCH-OVER AND DESELECT CIRCUITRY ■ CHOICE OF POWER-FAIL DESELECT VOLTAGES – M41ST87Y: VCC = 4.75 to 5.5V; THS Bit = '1': 4.50V ≤ VPFD ≤ 4.75V VCC = 4.5 to 5.5V; THS Bit = '0': 4.20V ≤ VPFD ≤ 4.50V – M41ST87W: VCC = 3.0 to 3.6V; THS Bit = '1': 2.8V ≤ VPFD ≤ 3.0V VCC = 2.7 to 3.6V; THS Bit = '0': 2.55V ≤ VPFD ≤ 2.70V ■ TWO INDEPENDENT POWER-FAIL COMPARATORS (1.25V REFERENCE) ■ COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES, HOURS, DAY, DATE, MONTH, YEAR, AND CENTURY ■ 128 BYTES OF GENERAL PURPOSE RAM ■ PROGRAMMABLE ALARM AND INTERRUPT FUNCTION (VALID EVEN DURING BATTERY BACK-UP MODE) ■ PROGRAMMABLE WATCHDOG TIMER ■ UNIQUE ELECTRONIC SERIAL NUMBER (8-BYTE) ■ 32kHz FREQUENCY OUTPUT AVAILABLE UPON POWER-ON ■ MICROPROCESSOR POWER-ON RESET ■ BATTERY LOW FLAG ■ ULTRA-LOW BATTERY SUPPLY CURRENT OF 500nA (TYP) SECURITY FEATURES ■ TAMPER INDICATION CIRCUITS WITH TIMESTAMP AND RAM CLEAR ■ LPSRAM CLEAR FUNCTION (TPCLR) ■ PACKAGING INCLUDES A 28-LEAD, EMBEDDED CRYSTAL SOIC ■ OSCILLATOR STOP DETECTION Figure 1. Package 28-pin, (300mil) SOX28 (MX) EMBEDDED Crystal |
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