M41T81 Datasheet, PDF (1/28 Pages) STMicroelectronics – Serial Access Real-Time Clock with Alarms

M41T81
SERIAL ACCESS RTC WITH ALARMS
FEATURES SUMMARY
s 2.0 TO 5.5V CLOCK OPERATING VOLTAGE
s COUNTERS FOR TENTHS/HUNDREDTHS
OF SECONDS, SECONDS, MINUTES,
HOURS, DAY, DATE, MONTH, YEAR, and
CENTURY
s AUTOMATIC SWITCH-OVER and DESELECT
CIRCUITRY
s SERIAL INTERFACE SUPPORTS I²C BUS
(400KHz PROTOCOL)
s PROGRAMMABLE ALARM and INTERRUPT
FUNCTION (valid even during Battery Back-up
Mode)
s WATCHDOG TIMER
s LOW OPERATING CURRENT OF 400µA
s BATTERY BACK-UP NOT RECOMMENDED
FOR 3.0V APPLICATIONS (CAPACITOR
BACK-UP ONLY)
s BATTERY OR SUPER-CAP BACK-UP
s OPERATING TEMPERATURE OF –40 TO
85°C
s ULTRA-LOW BATTERY SUPPLY CURRENT
OF 1µA
s PACKAGE OPTIONS INCLUDE A 28-LEAD or
18-LEAD EMBEDDED CRYSTAL SOIC
Figure 1. 8-pin SOIC Package
8
1
SO8 (M)
Figure 2. 28-pin (300mil) SOIC Package*
EMBEDDED Crystal
SOX28 (MX)
Figure 3. 18-pin (300mil) SOIC Package*
EMBEDDED Crystal
18
1
SOX18 (MY)
September 2003
Rev. 2.0
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