DS1225AD-85

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Memory

The DS1225AD-85 is a non-volatile CMOS 8K x8 SRAM that combines high performance CMOS technology with a lithium energy back-up system. It is designed to keep data intact over an extended period of time without the additional circuitry or components of other non-volatile memory solutions. It offers direct replacement of standard memory in existing systems without the need for battery back-up.

Application Field

The DS1225AD-85 is a non-volatile Random Access Memory (NVRAM) with a very low power requirement. It offers an ideal solution for applications that require short term memory retention during power loss, like contextual systems, digital instruments, data loggers, and Programmable Logic Controllers (PLCs). It is highly reliable, offering faster access times than EEPROM, and longer life expectancy.

Working Principle

The DS1225AD-85 is a CMOS SRAM with a built-in lithium energy source. It utilizes 70 mA of current from the power supply to activate a byte-wide non-volatile SRAM cell. When the power supply is disconnected, the lithium battery keeps the cells powered, preserving the data without the need for additional components.

The DS1225AD-85 also utilizes a special circuit that prevents the lithium battery voltage from sinking too low and corrupting the data. This circuit kicks in when the voltage drops to a predetermined level, automatically powering up the cells, thus protecting the data.

In addition, the DS1225AD-85 utilizes a watchdog timer designed to disable the output of the chip when the power supply stumbles for more than a set amount of time. This prevents the chip from expending too much energy through continuous writing and reading operations.

The DS1225AD-85 can operate from two supply voltages: 5V or 12V. While 5V operations is the most common, 12V operation might be necessary in certain cases, to give more voltage headroom to the lithium battery.

To sum up, the DS1225AD-85 is an ideal solution for applications that require short term memory retention during power loss. It offers fast access times, long life expectancy, low power consumption, and improved reliability over traditional EEPROM solutions.

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