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M41T56 Dataheets PDF



Part Number M41T56
Manufacturers ST Microelectronics
Logo ST Microelectronics
Description 512 bit 64b x8 Serial Access TIMEKEEPER SRAM
Datasheet M41T56 DatasheetM41T56 Datasheet (PDF)

www.DataSheet4U.com M41T56 Serial Real Time Clock with 56 bytes NVRAM Feature summary ■ Counters for seconds, minutes, hours, day, date, month, years, and century 32 KHz crystal oscillator integrating load capacitance (12.5pF) providing exceptional oscillator stability and high crystal series resistance operation Serial interface supports I2C Bus (400kHz protocol) Ultra-low battery supply current of 450nA (typ@3V) 5V ±10% supply voltage Timekeeping down to 2.5V Automatic power-fail detect and .

  M41T56   M41T56



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www.DataSheet4U.com M41T56 Serial Real Time Clock with 56 bytes NVRAM Feature summary ■ Counters for seconds, minutes, hours, day, date, month, years, and century 32 KHz crystal oscillator integrating load capacitance (12.5pF) providing exceptional oscillator stability and high crystal series resistance operation Serial interface supports I2C Bus (400kHz protocol) Ultra-low battery supply current of 450nA (typ@3V) 5V ±10% supply voltage Timekeeping down to 2.5V Automatic power-fail detect and switch circuitry 56 bytes of general purpose RAM Software clock calibration to compensate crystal deviation due to temperature Automatic leap year compensation Operating temperature of –40 to 85°C Packaging options include: – 28-lead SOIC and SNAPHAT® TOP (to be ordered separately) – SO8N 8 1 SO8N (M) 150mil width ■ ■ ■ ■ ■ ■ ■ ■ SNAPHAT (SH) battery & crystal ■ ■ ■ 28 1 SOH28 (MH) October 2006 Rev 5 1/28 www.st.com 1 Contents M41T56 Contents 1 2 Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 2-wire bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1.1 2.1.2 2.1.3 2.1.4 2.1.5 Bus not busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Start data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Stop data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Data valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 2.3 2.4 READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 Data retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 3 Clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 3.1 3.2 3.3 Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Output driver pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 4 5 6 7 8 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Package mechanical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 Part numbering . . . . . . . . . . . . . . . . . . . . . .


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