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M41ST87YMX6TR 数据表(PDF) 1 Page - STMicroelectronics |
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M41ST87YMX6TR 数据表(HTML) 1 Page - STMicroelectronics |
1 / 48 page September 2008 Rev 7 1/48 1 M41ST87Y M41ST87W 5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM Features ■ 5.0, 3.3, or 3.0 V operation ■ 400 kHz I2C bus ■ NVRAM supervisor to non-volatize external LPSRAM ■ 2.5 to 5.5 V oscillator operating voltage ■ Automatic switchover and deselect circuitry ■ Choice of power-fail deselect voltages – M41ST87Y: THS = 1: VPFD≈ 4.63 V; VCC = 4.75 to 5.5 V THS = 0: VPFD≈ 4.37 V; VCC = 4.5 to 5.5 V – M41ST87W: THS = 1: VPFD ≈ 2.9 V; VCC = 3.0 to 3.6 V THS = 0: VPFD ≈ 2.63 V; VCC = 2.7 to 3.6 V ■ Two independent power-fail comparators (1.25 V reference) ■ Counters for tenths/hundredths of seconds, seconds, minutes, hours, day, date, month, year, and century ■ 128 bytes of clearable, general purpose NVRAM ■ Programmable alarm and interrupt function (valid even during battery backup mode) ■ Programmable watchdog timer ■ Unique electronic serial number (8-byte) ■ 32 kHz frequency output available upon power- on ■ Microprocessor power-on reset output ■ Battery low flag ■ Ultra-low battery supply current of 500 nA (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 28-pin, (300 mil) SOX28 (MX) Embedded crystal www.st.com |
类似零件编号 - M41ST87YMX6TR |
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类似说明 - M41ST87YMX6TR |
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