256 Mbit parallel NOR flash — density and interface fit
The S26KL256SDABHB030: Organised as 32M x 8 bits, the 256 Mbit density suits code-shadowing and execute-in-place (XIP) applications where the MCU fetches instructions directly from NOR flash without copying to RAM. The parallel interface runs at 100 MHz with a 96 ns access time — the random-read latency is the ceiling for how fast the CPU can fetch the first word from a new address; sequential reads after the initial access are faster because the page buffer pre-fetches the next data.
Rated for 2.7 V supply — this is the core operating rail; the device draws its specified current from this single supply, so the power budget for the memory subsystem is the product of the active read current at 100 MHz and the duty cycle of the access pattern.
Package and board integration
Supplied in a 24-ball FBGA package (Bulk) for surface-mount assembly — the 0.80 mm ball pitch is standard for this density and can be routed on a 4-layer PCB without microvias. The parallel interface means 24 address lines plus 8 data lines and control signals (CE#, OE#, WE#) — the PCB layout must keep trace lengths matched within a few mm to avoid setup/hold violations at 100 MHz.