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DS1244Y-150 DALLAS

Real time clock 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 op-
eration and retains RAM data

? Watch function is transparent to RAM operation

? Month and year determine the number of days in each
month; volid up to 1200

? Standard 28?pin JEDEC pinout

? Full 10% operating range

? Operating temperature range 0

? C to 70

? Accuracy is better than

1 minute/month @ 25

?Over 10 years of data retention in the absence of
power

Reset

DESCRIPTION

The DS1244Y 256K NV SRAM with Phantom Clock is a
fully static nonvolatile RAM (organized as 32,768 words
by 8 bits) with a built?in real time clock. The DS1244Y
has a self?contained lithium energy source and control
circuitry which constantly monitors V

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.