X28HC256JI-90R5420

Memory

The X28HC256JI-90R5420 is a kind of memory integrated circuit (IC) which is widely used in many different applications. It is composed of an address bus, an instruction bus, and 256-kbits. These 256-kbits are divided into 8-kbits per each one. It can be used as read-only memory (ROM) or as static random access memory (SRAM).

Application Field

The X28HC256JI-90R5420 is mainly used in embedded system product. It is mainly used for storage or execute the data or instruction of target applications. Its uses can be found in the computer, communication, entertainment and other related fields.

It can be used for low power device but also for embedded controller. Its uses can be found in the aerospace industries, automotive electronics, industrial automation, medical equipment, lotteries, POS terminals, printers, consumer electronics, etc.

Working Principle

The X28HC256JI-90R5420 can be used for both static random access memory and read-only memory. In static random access memory, the user can write and read data and instructions onto and from the chip, while in read-only memory, the user can only read the data and instructions one time, and that would remain until the chip is reset or powered down.

The X28HC256JI-90R5420 memory chip operates on the synchronous mode. That is, the data and instructions are read and written in synchronous with the bus clock. The bus clock controls the communication between the memory and CPU. Whenever the CPU needs data or instructions, it issues a chip select and row and column addresses. The corresponding 8-kbits of data will be read from the designated cell and sent to the CPU upon the completion of the read cycle.

In order to write data or instructions, the user must issue the chip select, row and column addresses, along with instruction and data. The corresponding 8-kbits will then be written onto the designated cell after the write cycle is completed.

Conclusion

The X28HC256JI-90R5420 is a kind of memory IC and it can be used as a static random access memory or read-only memory. It is widely used in many different applications such as the computer, communication, entertainment, automotive electronics, medical equipment, etc. It operates on the synchronous mode where all data and instructions are read and written in synchronous with the bus clock.