AT28HC256-70TI

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AT28HC256-70TI as a memory IC is a 32K x 8 CMOS Electrically Erasable Programmable Read-Only Memory (EEPROM). Memory cells are divided into 16 blocks of 2K x 8 bytes each. It supports 4kV of ESD protection and -40°C to +85°C operating temperatures.

AT28HC256-70TI application field is diverse. It is widely used in applications such as machine control, touchscreens, home automation, automotive and navigational systems, industrial control, etc. It is manufactured in a small number of packages and is easy to integrate into a variety of electronic products. The IC can be configured as non-volatile memory to store data, including program code.

Working principle of AT28HC256-70TI, like other memories, is based on a memory array. The array contains 32K bits, and can store 8 bits in each storage cell. Array is organized as 16 blocks of 2K x 8 bits. Data can be read and written with help of a two-port serial interface and two-wire command set. All memory operations require the chip select (CS) pin to be low, which is handled by microcontrollers.

The core of the AT28HC256-70TI is a long array of memory cells. To read or write from a memory cell, the address of the cell must be selected. The address is set by multiplexing the address lines A0-A15. Each memory cell holds an 8-bit quantity, represented by DQ0-DQ7 in the AT28HC256-70TI. Data is transferred from or to the cell’s 8-bit output pin. Program/erase operation is controlled by the command/data (CD) pin.

The memory array is split into 16 blocks of 2K x 8 bits each. Blocks can be read, programmed, or erased individually. The Program/Erase cycles are initiated by a series of special commands. Program/Erase operations start with sending a 3-byte command sequence. There are two programming operations: the Byte Load Mode and the Page Load Mode. These programming modes are used to write data into the array. Erase operations are used to set all bits of a block to 0. During the Program/Erase cycles the chip’s internal voltage regulator is activated and the write protection is activated to avoid accidental writes/erases.

AT28HC256-70TI also has an internal programming time-out counter. The counter is used to detect inactivity during Program/Erase operations. The counter is reset by Power On Reset or Program/Erase operations. Other features include four standby modes, power-down mode, and block locked feature to prevent the accidental deletion of important data.

In summary, AT28HC256-70TI is a versatile memory IC. It is designed to store data in non-volatile memory and is optimized for low power applications. The EEPROM has an array of 16 blocks of 2K x 8 bits each and can be programmed or erased on a block level. It also has a power protection feature and a time out counter to ensure reliable operation. As an EEPROM, it is highly compatible and can be used in a variety of applications such as machine control, touchscreens, home automation and industrial control systems.

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