AT28C64B-15JI

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The AT28C64B-15JI is a device that belongs to the family of erasable and reprogrammable nonvolatile memories released by Atmel Corporation. This device is a 64Kbit electrically erasable programmable memory (EEPROM), optimized for a wide range of applications.

Application field

The AT28C64B-15JI is an 8-bit CMOS device with a maximum endurance of 50000 write/erase cycles and a data retention of usually more than 100 years. It is mainly used for code and data storage, parameter storage for microcomputers, and providing as interrupt vector for microprocessors; it also has broad application in networking, consumer electronics, instrumentation, industrial control, and automotive electronics, in which compact environment, long-time data operation and high-level performance memory are strictly demanded.

Working principle

The circuit built by the AT28C64B-15JI consists of a 4K x 8-bit array controlled by a control logic circuit. In the circuit, all control logic and array circuitry are built inside a single chip of silicon. The 8-bit data bus and a variety of control lines can be used to access any byte in the array whenever data needs to be read, written, or programmed. The memory array is divided into pages of 16 bytes each, and an erase and write operation can be done at this page level without the need to erase or write the entire array. An extra page is reserved to store device data and the status.

To write data into the row, the logic circuit first erases all bits in the row and then programs the data into the row. Data to be written first passes through an input buffer, and when it is gated out the bits which remain at the same logic state will be erased. Data is written into a row by applying high programming voltages and stimulating data write analysis. If a write operation occurs, data is then moved from the temporary storage circuit to the data latch. When this occurs, a write pulse is sent from the control logic unit to the row address demultiplexer to determine the row that the data is being written to and the voltage for programming will be applied. Finally, when all bits are written, the programmed row is again read back to check the data.

Conclusion

The AT28C64B-15JI is a widely used nonvolatile memory chip, owned by Atmel Corporation, with many applications in all sizes of various industries. It can store, delete, and rewrite data and code in-situ, and it is programmed with a pulse-voltage technique. In conclusion, the AT28C64B-15JI is a reliable and convenient nonvolatile storage solution with immense potential.

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