M41T0M6F STMicroelectronics

M41T0 Serial real-time clock Features Counters for seconds, minutes, hours, day, date, month, years, and century 32 KHz crystal oscillator integrating load capacitance (12.5 pF) providing exceptional oscillator stability and high crystal series resistance operation 8 Oscillator stop detection monitors clock operation 2 1 Serial interface supports I C bus (400 kHz protocol) Low standby current 0.9 A (typ at 3 V) 2.0 to 5.5 V clock operating voltage SO8 Special software programmable output Operating temperature of 40 to 85 C June 2011 Doc ID 9105 Rev 7 1/23 www.st.com 1Contents M41T0 Contents 1 Description . 5 2 Operation 7 2.1 2-wire bus characteristics 7 2.1.1 Bus not busy 7 2.1.2 Start data transfer 7 2.1.3 Stop data transfer 7 2.1.4 Data valid . 8 2.1.5 Acknowledge 8 2.2 READ mode . 10 2.3 WRITE mode 11 3 Clock operation 13 3.1 Output driver pin 13 3.2 Oscillator stop detection 13 3.3 Initial power-on defaults 14 4 Maximum ratings . 15 5 DC and AC parameters 16 6 Package mechanical information 18 7 Part numbering 21 8 Revision history . 22 2/23 Doc ID 9105 Rev 7