PM256K is a 256K Bit/32K Byte SPI interface non-volatile memory. The chip adopts advanced  PMTJ STT-MRAM technology, supports single-line SI and SO independent interfaces, achieves  up to 20MHz read and write transmission, and has no delay in writing. It has excellent  reliability and more than 20 years of data retention time. PM256K is an ideal solution for MCU to expand external memory. At the same time, due to the characteristics of fast throughput, few pins and small size, it has gradually become the choice of  applications such as embedded, network switches, automobiles and the Internet of Things.