M41T00M6F Datasheet M41T00M6F, M41T00M6E | P1-P3

This is information on a product in full production.

June 2015 DocID6100 Rev 10 1/25

M41T00

Serial real-time clock

Datasheet - production data

Features

 For new designs use M41T00S

 Counters for seconds, minutes, hours, day,

month, years, and century

 32 kHz crystal oscillator integrating load

capacitance (12.5 pF) providing exceptional

oscillator stability and high crystal series

resistance operation

 Serial interface supports I

C bus (100 kHz

protocol)

 Ultra low battery supply current of 0.8 μA

(typ at 3 V)

 2.0 to 5.5 V clock operating voltage

 Automatic switchover and deselect circuitry

(for 3 V application select M41T00S datasheet)

 Software clock calibration to compensate

crystal deviation due to temperature

 Automatic leap year compensation

 Operating temperature of -40 to 85 °C

Description

The M41T00 is a low power serial real-time clock

with a built-in 32.768 kHz oscillator (external

crystal controlled). Eight 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

WRITE or READ data byte.

The M41T00 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 5 years

with a 50 mA/h 3 V lithium cell (see Section 2.10:

Data retention mode for AC/DC characteristics).

The M41T00 is supplied in an 8-lead plastic small

outline package.

SO8

www.st.com

Contents M41T00

2/25 DocID6100 Rev 10

Contents

1 Device overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

2 Device operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.1 Wire bus characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.2 Bus not busy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.3 Start data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2.4 Stop data transfer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.5 Data valid . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.6 Acknowledge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

2.7 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.8 READ mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

2.9 WRITE mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2.10 Data retention mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

3 M41T00 clock operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

3.1 Clock calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

3.2 Output driver pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

3.3 Initial power-on defaults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

4 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

5 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

6 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

6.1 SO8 package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

DocID6100 Rev 10 3/25

M41T00 List of tables

List of tables

Table 1. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 2. AC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Table 3. RTC power down/up ac characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 4. RTC power down/up trip points dc characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Table 5. Register map. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Table 6. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Table 7. Operating and AC measurement conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 8. Capacitance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Table 9. DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 10. Crystal electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Table 11. SO8 – 8-lead plastic small outline, 150 mils body width, package mechanical data . . . . . 22

Table 12. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Table 13. Revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P25

M41T00M6F

Mfr. #:

Buy M41T00M6F

Manufacturer:

STMicroelectronics

Description:

Real Time Clock Serial 64 (8X8)

Lifecycle:

New from this manufacturer.

Delivery:

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Payment:

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M41T00M6F

M41T00M6F

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