Product Summary

The DS1251Y-100 is a 4096K NV SRAM with Phantom Clock. It is a fully static nonvolatile RAM (organized as 512K words by 8 bits) with a built–in real time clock. The DS1251Y-100 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.

Parametrics

DS1251Y-100 absolute maximum ratings: (1)Voltage on Any Pin Relative to Ground: –0.3V to +7.0V; (2)Operating Temperature: 0 to 70℃; (3)Storage Temperature: –40 to +70℃; (4)Soldering Temperature: 260℃ for 10 seconds.

Features

DS1251Y-100 features: (1)Real time clock keeps track of hundredths of seconds, minutes, hours, days, date of the month, months, and years; (2)512K × 8 NV SRAM directly replaces volatile static RAM or EEPROM; (3)Embedded lithium energy cell maintains calendar operation and retains RAM data; (4)Watch function is transparent to RAM operation; (5)Month and year determine the number of days in each month; valid up to 2100; (6)Standard 32–pin JEDEC pinout; (7)Full 10% operating range; (8)Operating temperature range 0 to 70℃; (9)Accuracy is better than ±1 minute/month @ 25℃; (10)Over 10 years of data retention in the absence of power; (11)Available in 120 ns and 150 ns access time.

Diagrams

DS1251Y-100 block diagram

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