M41T00

2/15

Figure 2. SOIC Connections

1

SDA

VSS

SCL

FT/OUT

OSCO

OSCI

VCC

VBAT

AI00531

M41T00

2

3

4

8

7

6

5

Table 2. Absolute Maximum Ratings

Note: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress

rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of

this specification is not implied. Exposure to the absolute maximum rating conditions for extended periods of time may affect reliability.

CAUTION: Negative undershoots below –0.3V are not allowed on any pin while in the Battery Back-up mode.

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

–40 to 85

°C

–55 to 125

°C

Input or Output Voltages

–0.3 to 7

V

Supply Voltage

–0.3 to 7

V

Output Current

20

mA

Power Dissipation

0.25

W

The M41T00 clock has a built-in power sense cir-

cuit which detects power failures and automatical-

ly 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 5years

with a 50mA/h 3V lithium cell. The M41T00 is sup-

plied in 8 lead Plastic Small Outline package.

OPERATION

The M41T00 clock operates as a slave device on

the serial bus. Access is obtained by implementing

a start condition followed by the correct slave ad-

dress (D0h). The 8 bytes contained in the device

can then be accessed sequentially in the following

order:

1.

Seconds Register

2.

Minutes Register

3.

Century/Hours Register

4.

Day Register

5.

Date Register

6.

Month Register

7.

Years Register

8.

Control Register

and resets the device address counter. Inputs to

the device will not be recognized at this time to

prevent erroneous data from being written to the

over to the battery and powers down into an ultra

low current mode of operation to conserve battery

life. Upon power-up, the device switches from bat-