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M41T56M6F

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27
List of figures M41T56
4/27 Doc ID 6104 Rev 9
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. 8-pin SOIC connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. M41T56 block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Serial bus data transfer sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 5. Acknowledge sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 6. Bus timing requirements sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 7. Slave address location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 8. Read mode sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 9. Alternative read mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 10. Write mode sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 11. Crystal accuracy across temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 12. Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 13. AC measurement I/O waveform . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 14. Power down/up mode AC waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 15. SO8 – 8-pin plastic small package outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 16. Carrier tape for SO8 package (150-mil body width) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 17. Reel schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
M41T56 Description
Doc ID 6104 Rev 9 5/27
1 Description
The M41T56 is a low-power, serial real-time clock (RTC) with 56 bytes of NVRAM. A built-in
32,768 Hz oscillator (external crystal controlled) and the first 8 bytes of the RAM are used
for the clock/calendar function and are configured in binary coded decimal (BCD) format.
Addresses and data are transferred serially via a two-line, bidirectional bus. The built-in
address register is incremented automatically after each WRITE or READ data byte.
The M41T56 clock has a built-in power sense circuit which detects power failures and
automatically switches to the battery supply during power failures. The energy needed to
sustain the RAM and clock operations can be supplied from a small lithium coin cell.
Typical data retention time is in excess of 10 years with a 50 mAh, 3 V lithium cell. The
M41T56 is supplied in an 8-lead plastic SOIC package.
Figure 1. Logic diagram
AI02304B
OSCI
V
CC
M41T56
V
SS
SCL
OSCO
SDA
FT/OUT
V
BAT
Description M41T56
6/27 Doc ID 6104 Rev 9
Figure 2. 8-pin SOIC connections
Figure 3. M41T56 block diagram
Table 1. Signal names
OSCI Oscillator input
OCSO Oscillator output
FT/OUT Frequency test / output driver (open drain)
SDA Serial data address input / output
SCL Serial clock
V
BAT
Battery supply voltage
V
CC
Supply voltage
V
SS
Ground
1
SDAV
SS
SCL
FT/OUTOSCO
OSCI V
CC
V
BAT
AI02306B
M41T56
2
3
4
8
7
6
5
AI02566
SECONDS
OSCILLATOR
32.768 kHz
VOLTAGE
SENSE
and
SWITCH
CIRCUITRY
SERIAL
BUS
INTERFACE
DIVIDER
CONTROL
LOGIC
ADDRESS
REGISTER
MINUTES
CENTURY/HOURS
DAY
DATE
MONTH
YEAR
CONTROL
RAM
(56 x 8)
OSCI
OSCO
FT/OUT
V
CC
V
SS
V
BAT
SCL
SDA
1 Hz
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27

M41T56M6F

Mfr. #:
Buy M41T56M6F
Manufacturer:
STMicroelectronics
Description:
Real Time Clock Serial 512 (64x8)
Lifecycle:
New from this manufacturer.
Delivery:
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