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DS1244 データシート

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DESCRIPTION
The DS1244 256k NV SRAM with a Phantom clock is a fully static nonvolatile RAM (NV SRAM) (organized as 32k words by 8 bits) with a built-in real-time clock. The DS1244 has a self-contained lithium energy source and control circuitry, which constantly monitors Vcc for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent garbled data in both the memory and real-time clock.

FEATURES
● Real-time clock (RTC) keeps track of hundredths of seconds, minutes, hours, days, date of the month, months, and years.
● 32k x 8 NV SRAM directly replaces volatile static RAM or EEPROM
● Embedded lithium energy cell maintains calendar operation and retains RAM data
● Watch function is transparent to RAM operation
● Month and year determine the number of days in each month; valid up to 2100
● Full 10% operating range
● Operating temperature range: 0℃ to +70℃
● Over 10 years of data retention in the absence of power
● Lithium energy source is electrically disconnected to retain freshness until power is applied for the first time
● DIP module only
● Standard 28-pin JEDEC pinout
● PowerCap® module board only
   - Surface mountable package for direct connection to PowerCap containing battery and crystal
   - Replaceable battery (PowerCap)
   - Pin-for-pin compatible with DS1248P and DS1251P
● Underwriters Laboratory (UL) recognized

 

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