M41T0 datasheet(4/20 Pages) STMICROELECTRONICS

4 / 20 page

M41T0

4/20

SUMMARY DESCRIPTION

The M41T0 TIMEKEEPER® RAM is a low power

Serial TIMEKEEPER with a built-in 32.768kHz os-

cillator (external crystal controlled). Eight registers

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 bi-directional bus. The built-in address

WRITE or READ data byte.

The M41T0 is supplied in 8 lead Plastic Small Out-

line package.

Figure 2. Logic Diagram

Figure 3. SOIC Connections

Note: 1. NF pin must be tied to VSS.

Table 1. Signal Names

Note: 1. NF pin must be tied to VSS.

AI07028

OSCI

VCC

M41T0

VSS

SCL

OSCO

SDA

OUT

SDA

VSS

SCL

OUT

OSCO

OSCI

VCC

(1)

AI07029

M41T0

OSCI

Oscillator Input

OCSO

Oscillator Output

OUT

Output Driver (Open Drain)

SDA

Serial Data Address Input / Output

SCL

Serial Clock

NF(1)

No Function

VCC

Supply Voltage

VSS

Ground

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