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M41T80M6TR, M41T81, M41T81M6

Table of contents:
Info of M41T80M6TR
Info of M41T81
Info of M41T81M6

M41T80M6TR, M41T81, M41T81M6 Selling Leads, Datasheet

MFG:ST Package Cooled:SOP/8 D/C:05+

M41T80M6TR, M41T81, M41T81M6 Datasheet download

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Part Number: M41T80M6TR

MFG: ST

Package Cooled: SOP/8

D/C: 05+

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M41T81 General Description

The M41T81 Serial Access TIMEKEEPER® SRAM is a low power Serial RTC with a built-in 32.768 KHz oscillator (external crystal controlled). Eight bytes of the SRAM (see Table 10, page 16) are used for the clock/calendar function and are configured in binary coded decimal (BCD) format. An additional 12 bytes of SRAM provide status/ control of Alarm, Watchdog and Square Wave functions. Addresses and data are transferred serially via a two line, bi-directional I2C interface. The built-in address register is incremented automatically after each WRITE or READ data byte.

The M41T81 has a built-in power sense circuit which detects power failures and automatically switches to the battery supply when a power failure occurs. The energy needed to sustain the SRAM and clock operations can be supplied by asmall lithium button supply when a power failure occurs. Functions available to the user include a non-volatile, time-of-day clock/calendar, Alarm interrupts, Watchdog Timer and programmable Square Wave output. The eight clock address locations contain the century, year, month, date, day, hour, minute, second and tenths/hundredths of a second in 24 hour BCD format. Corrections for 28, 29 (leap year - valid until year 2100), 30 and 31 day months are made automatically.

The M41T81 is supplied in either an 8-pin SOIC or an 18-pin (MY) or 28-pin (MX), 300mil SOIC package which includes an embedded 32kHz crystal. The 8-pin and 28-pin, embedded crystal SOIC requires only a user-supplied battery to provide nonvolatile operation.

M41T81 Maximum Ratings

Symbol	Parameter		Value	Unit
T_STG	Storage Temperature (V_CC Off, Oscillator Off)	SOIC	55 to 125
V_CC	Supply Voltage		0.3 to 7	V
T_SLD⁽¹⁾	Input or Output Voltage		260
V_IO	Lead Solder Temperature for 10 seconds		0.3 to Vcc+0.3	V
I_O	Output Current		20	mA
P_D	Power Dissipation		1	W

Note: 1. Reflow at peak temperature of 215 to 225 for < 60 seconds (total thermal budget not to exceed 180 for between 90 to 120 seconds).
CAUTION: Negative undershoots below 0.3 volts are not allowed on any pin while in the Battery Back-Up Mode.

M41T81 Features

` 2.0 TO 5.5V CLOCK OPERATING VOLTAGE
` COUNTERS FOR TENTHS/HUNDREDTHS OF SECONDS, SECONDS, MINUTES
    HOURS, DAY, DATE, MONTH, YEAR, and ENTURY
` AUTOMATIC SWITCH-OVER and DESELECT CIRCUITRY
` SERIAL INTERFACE SUPPORTS I2C BUS (400KHz PROTOCOL)
` PROGRAMMABLE ALARM and INTERRUPT
    FUNCTION (valid even during Battery Back-up Mode)
` WATCHDOG TIMER
` LOW OPERATING CURRENT OF 400A
` BATTERY BACK-UP NOT RECOMMENDED
    FOR 3.0V APPLICATIONS (CAPACITOR BACK-UP ONLY)
` BATTERY OR SUPER-CAP BACK-UP
`OPERATING TEMPERATURE OF 40 TO 85
` ULTRA-LOW BATTERY SUPPLY CURRENT OF 1 A
` PACKAGE OPTIONS INCLUDE A 28-LEAD or 18-LEAD EMBEDDED CRYSTAL SOIC

M41T81 Connection Diagram

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