M41T11M6E STMicroelectronics

M41T11 Serial real-time clock (RTC) with 56 bytes of NVRAM Datasheet production data Features Counters for seconds, minutes, hours, day, date, month, years and century 8 32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional 1 oscillator stability and high crystal series resistance operation SO8 2 Serial interface supports I C bus (100 kHz protocol) Ultra-low battery supply current of 0.8 A (typ. at 3 V) 2.0 to 5.5 V clock operating voltage Automatic switchover and deselect circuitry 56 bytes of general purpose RAM SNAPHAT battery & crystal Software clock calibration to compensate crystal deviation due to temperature Automatic leap year compensation Operating temperature of 40 to 85C 28 Packaging includes a 28-lead SOIC and 1 SNAPHAT top (to be ordered separately 3.3 V to 5.0 V supply voltage only) SOH28 RoHS compliant Lead-free second level interconnect June 2012 Doc ID 6103 Rev 10 1/30 This is information on a product in full production. www.st.com 1Contents M41T11 Contents 1 Description . 5 2 Operation 8 2.1 2-wire bus characteristics 8 2.1.1 Bus not busy 8 2.1.2 Start data transfer 8 2.1.3 Stop data transfer 9 2.1.4 Data valid . 9 2.1.5 Acknowledge 9 2.2 Read mode 11 2.3 Write mode 13 2.4 Data retention mode . 13 3 Clock operation 14 3.1 Clock calibration 15 3.2 Output driver pin 16 3.3 Preferred initial power-on defaults 16 4 Maximum ratings . 18 5 DC and AC parameters 19 6 Package mechanical data 22 7 Part numbering 27 8 Environmental information . 28 9 Revision history . 29 2/30 Doc ID 6103 Rev 10