Datasheet
Table Of Contents
- Table 1. Device summary
- 1 Description
- Figure 1. M41T62 logic diagram
- Figure 2. M41T63 logic diagram
- Figure 3. M41T64 logic diagram
- Figure 4. M41T65 logic diagram
- Figure 5. M41T62 connections
- Figure 6. M41T63 connections
- Figure 7. M41T64 connections
- Figure 8. M41T65 connections
- Table 2. Signal names
- Figure 9. M41T62 block diagram
- Figure 10. M41T63 block diagram
- Figure 11. M41T64 block diagram
- Figure 12. M41T65 block diagram
- Figure 13. Hardware hookup for SuperCap™ backup operation
- 2 Operation
- 3 Clock operation
- 3.1 RTC registers
- 3.2 Calibrating the clock
- 3.3 Setting alarm clock registers
- 3.4 Watchdog timer
- 3.5 Watchdog output (WDO - M41T63/65 only)
- 3.6 Square wave output (M41T62/63/64)
- 3.7 Full-time 32 KHz square wave output (M41T64)
- 3.8 Century bits
- 3.9 Leap year
- 3.10 Output driver pin (M41T62/65)
- 3.11 Oscillator stop detection
- 3.12 Initial power-on defaults
- 4 Maximum ratings
- 5 DC and AC parameters
- Table 12. Operating and AC measurement conditions
- Figure 25. AC measurement I/O waveform
- Figure 26. Crystal isolation example
- Table 13. Capacitance
- Table 14. DC characteristics
- Table 15. Crystal electrical characteristics
- Table 16. Crystals suitable for use with M41T6x series RTCs
- Table 17. Oscillator characteristics
- Figure 27. Bus timing requirements sequence
- Table 18. AC characteristics
- 6 Package mechanical information
- Figure 28. QFN16 - 16-pin, quad, flat package, no-lead, 3 mm x 3 mm body size, outline
- Table 19. QFN16 - 16-pin, quad, flat package, no-lead, 3 mm x 3 mm body size, mechanical data
- Figure 29. QFN16 - 16-pin, quad, flat package, no-lead, 3 x 3 mm, recommended footprint
- Figure 30. LCC8 - 8-pin, 1.5 mm x 3.2 mm leadless chip carrier, outline
- Table 20. LCC8 - 8-pin, 1.5 mm x 3.2 mm leadless chip carrier, mechanical data
- Figure 31. LCC8 - 8-pin, 1.5 mm x 3.2 mm leadless chip carrier, recommended footprint
- Figure 32. Carrier tape for QFN16 3 mm x 3 mm package
- Table 21. Carrier tape dimensions for QFN16 3 mm x 3 mm package
- Figure 33. Carrier tape for LCC8 1.5 mm x 3.2 mm package
- Figure 34. Reel schematic
- Table 22. Reel dimensions for 12 mm carrier tape - QFN16 and LCC8 packages
- 7 Part numbering
- 8 Revision history
DocID10397 Rev 20 43/44
M41T62, M41T63, M41T64, M41T65 Revision history
8 Revision history
Table 24. Document revision history
Date Revision Changes
26-Jan-2010 12
Minor textual changes; updated Section 3.2; footnote 3 in Table 11;
footnote 1 in Table 15; text in Section 6; Table 16, 18.
07-May-2010 13
Updated title of datasheet, Features, Section 1, Section 3.1, 3.2, 3.4,
3.11, Section 4, Figure 23, Table 16; added Figure 20, added
embedded crystal package LCC8 (updated Figure 1, 5, 29, Tab l e 23 ).
25-May-2010 14
Removed LCC8 package option throughout document; removed
footnote from Table 14.
24-Mar-2011 15
Updated Table 1, 17, 23; added LCC8 package option throughout
datasheet; added tape and reel specifications for packages (Figure 32,
33, 34, Table 21, 22).
22-Jun-2011 16 Updated Features; updated LCC8 package height in Figure 30.
10-Oct-2011 17
Updated V
OL
test condition in Table 14: DC characteristics; minor
textual updates.
09-Nov-2011 18 Updated Figure 30, Table 22; added Table 20, Figure 31.
01-Dec-2011 19 Updated title and Tab le 16 .
21-Feb-2013 20
Updated title of datasheet; updated Section 3.8: Century bits; added
Figure 24: Century bits CB1 and CB0; moved and modified Table 9:
Examples using century bits; added Section 3.9: Leap year; added
footnote 1 to Table 16: Crystals suitable for use with M41T6x series
RTCs.