AT27C020-55JU

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AT27C020-55JU is a 256K x 8 Bits erasable PROM (Programmable Read-Only Memory) device with a 100MHz access time, commonly used in industrial control, medical equipment, capital markets and automotive applications.

The AT27C020-55JU\'s main memory capacity is 256K (32,768 bytes) of Non-Volatile Memory (EPROM), divided into 256 pages of 128 bytes each. It is equipped with five address lines (A0 to A4) and one data line (D0 to D7). All data stored in the device remains valid until it is erased or the power is removed.

The AT27C020-55JU is designed for functionality and performance. It is fast and robust, designed for operation at temperatures up to 105°C. It also has a guaranteed minimum data retention of 20 years.

The device also has a wide operating voltage range of 2.7V to 5.5V and is compatible with 3.3V logic. It is available in three different packages: PLCC, DIP and SOIC.

At the heart of the AT27C020-55JU is a Complex Programmable Logic Device (CPLD), which is used to control the process of reading, writing and erasing data stored in the device. It has an address decoder, which translates the address input into a control signal, which determines which memory cell is selected and whether the data will be read, written or erased.

Once a memory cell is selected, the data stored in it can be either read or written. When reading, the contents of the selected memory cell are output onto the data line. When writing, the data stored on the data line is written into the selected memory cell. To erase the stored data, the device is exposed to an UV light source, which erases the charge stored in the cell.

In summary, the AT27C020-55JU is an erasable PROM device designed for industrial control, medical equipment, capital markets and automotive applications. It offers a large capacity, wide operating voltage and temperature range, fast access speed and a guaranteed minimum data retention of 20 years.

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