8Mbit boot-block Flash for harsh-environment firmware storage
The Intel DE28F800F3T115 is an 8Mbit boot-block Flash memory organized as 512K x 16, with a 115 ns access time and a Common User Interface (CUI) for command-driven read/write operations. The boot-block architecture provides hardware-protected sectors for critical boot code, preventing accidental corruption during power-loss or incomplete writes — a feature that matters for embedded systems where the CPU must come up cleanly after a brownout.
The 115 ns access time is the window from address assertion to valid data on the bus. Write cycle time is 200 µs per word or page.
Boot Block architecture and field-reprogramming
Boot-block Flash partitions the memory array into independently lockable sectors, with the boot block (typically the lowest address range) protected by a hardware write-lock mechanism. This prevents a runaway firmware update from bricking the system — the bootloader stays intact even if the application sector is corrupted mid-write. The CUI command set follows the industry-standard 12V-block erase/program algorithm, so existing firmware drivers for Intel 28F-series Flash should port with minimal changes. No field-reprogramming via UART or JTAG is built in; the host CPU manages all erase and program sequences through the parallel interface.
Package and temperature grade — where it fits physically
Housed in a 56-SSOP surface-mount package, this part operates from -40°C to 125°C and from 3V to 3.6V.