AT28HC256-90TI

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The AT28HC256-90TI is a low-power, 32K-bit, high speed Serial CMOS EEPROM memory device with both Byte-Wide and Page write capability. It belongs to the Memory category. This device is fabricated with Atmel\'s Advanced CMOS EEPROM technology, which features much lower operating current than other similar CMOS EEPROMs.

Application Field

The AT28HC256-90TI is mainly used for storage in a wide range of applications such as consumer electronics, medical instrumentation, telecommunication systems, industrial automation and more. It can also be used to store personal data such as calendars, alarm settings and bios settings in embedded system applications. Moreover, this device has a unique feature—security registration. It can provide a high level of security and fraud prevention for electronic transactions.

Working Principle

The AT28HC256-90TI is an 8-pin CMOS device, providing 32Kbits of nonvolatile memory. It can be programmed both in byte-wide (8-bit) words, or in page increments up to a maximum of 16 bytes. Serial communications enable efficient control of the system. The device operates on a single 2.7 to 3.6V supply and contains an on-chip oscillator to generate signals for writing, programming, erasing data and reading the stored information.

Writing data to the device is done through a 3-wire serial interface. First, the memory address is shifted into the device via the serial Data Input pin (SI). Then, write-enable (WE) is asserted low and the data is shifted into the register bits. Lastly, the end of the write cycle is signaled by the rising edge of the Clock (SCLK) pin.

Erasing data from the device is also done through the 3-wire serial interface, with the same control signals used for writing. However, the operation mode is different—the erase cycle requires additional bits of data sent on the SI pin.

Finally, data can be read from the device in serial or byte-wide modes, using the 3-wire serial interface. In the serial read mode, the data is serially shifted out on the serial Data Output (SO) line with the Clock (SCLK) pin controlling the timing. The same setup is used for the Byte-wide read operation, however the data-out is on eight successive clock edges instead of one.

Conclusion

The AT28HC256-90TI is a low-power, 32K-bit, high speed Serial CMOS EEPROM memory device with both Byte-Wide and Page write capability. It is mainly used for storage in a wide range of applications, including consumer electronics, medical instrumentation and telecommunication systems. The device can be programmed and erased through a 3-wire serial interface, and the data can be read in serial or byte-wide modes.

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