1/15

May 2000

M41T00

s

2.0V to 5.5V SUPPLY VOLTAGE

s

COUNTERS for SECONDS, MINUTES,

HOURS, DAY, DATE, MONTH, YEARS and

CENTURY

s

YEAR 2000 COMPLIANT

s

SOFTWARE CLOCK CALIBRATION

s

AUTOMATIC SWITCH-OVER and DESELECT

CIRCUITRY

s

s

ULTRA-LOW BATTERY SUPPLY CURRENT

of 1µA

s

LOW OPERATING CURRENT of 300µA

s

OPERATING TEMPERATURE of –40 to 85°C

s

AUTOMATIC LEAP YEAR COMPENSATION

s

SPECIAL SOFTWARE PROGRAMMABLE

OUTPUT

DESCRIPTION

Serial TIMEKEEPER with a built-in 32.768kHz os-

cillator (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 serial-

ly via a two-line bi-directional bus. The built-in ad-

dress register is incremented automatically after

each write or read data byte.

Figure 1. Logic Diagram

AI00530

OSCI

VCC

M41T00

VSS

SCL

OSCO

SDA

FT/OUT

VBAT

8

1

SO8 (M)

150mil Width

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

Battery Supply Voltage

Supply Voltage

Ground