M41T00M STMICROELECTRONICS [STMicroelectronics], M41T00M Datasheet
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M41T00M
Manufacturer Part Number
M41T00M
Description
Serial Access TIMEKEEPER
Manufacturer
STMICROELECTRONICS [STMicroelectronics]
Datasheet
1.M41T00M.pdf
(15 pages)
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DESCRIPTION
The M41T00 TIMEKEEPER
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.
Table 1. Signal Names
May 2000
OSCI
OCSO
FT/OUT
SDA
SCL
V
V
V
2.0V to 5.5V SUPPLY VOLTAGE
COUNTERS for SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEARS and
CENTURY
YEAR 2000 COMPLIANT
SOFTWARE CLOCK CALIBRATION
AUTOMATIC SWITCH-OVER and DESELECT
CIRCUITRY
I
ULTRA-LOW BATTERY SUPPLY CURRENT
of 1µA
LOW OPERATING CURRENT of 300µA
OPERATING TEMPERATURE of –40 to 85°C
AUTOMATIC LEAP YEAR COMPENSATION
SPECIAL SOFTWARE PROGRAMMABLE
OUTPUT
2
BAT
CC
SS
C BUS COMPATIBLE
Oscillator Input
Oscillator Output
Frequency Test / Output Driver
(Open Drain)
Serial Data Address Input / Output
Serial Clock
Battery Supply Voltage
Supply Voltage
Ground
®
RAM is a low power
Figure 1. Logic Diagram
Serial Access TIMEKEEPER
OSCI
SCL
150mil Width
V CC
V SS
8
SO8 (M)
M41T00
1
V BAT
M41T00
OSCO
SDA
FT/OUT
AI00530
1/15
®