256 Mbit SPI NOR flash for code-shadow and data-logging
The MT25QU256ABA8E12-1SIT is a 256 Mbit (32 M x 8) SPI NOR flash from Micron's Quad I/O family, organized for high-density code storage and fast readback in embedded systems. With a 133 MHz clock rate and Quad I/O interface, the sustained read throughput reaches 532 MHz equivalent — enough to support XiP (eXecute-in-Place) from the flash for many Cortex-M and application processors without a separate DRAM.
Package, footprint, and write-cycle budget
Page program time is 2.8 ms typical, and sector erase is 8 ms typical — budget these into the firmware update routine; a full 256 Mbit erase at the sector level takes roughly 2.5 seconds on the quad-lane bus. Supplied in a Tray, the package is suitable for volume pick-and-place; the MSL rating (not listed) should be verified from the full datasheet for reflow profile planning.