A 20 MB/s data rate 2.5 V flash memory with current-controlled field erasing for 1 M cycle endurance

Techniques to improve endurance and access time are applied to 2.5V high-density flash memory. A 4Mb flash product is used as a test vehicle for an erase method that extends the program/erase (P/E) endurance beyond 106 cycles. An embedded /spl mu/ROM controller with optimized algorithms (zero P/E array stress) minimizes erase time (parallel sector erase) and reduces testing time (BIST techniques). A 20MB/s read data throughput at 2.5V is obtained in OE synchronized data transfer mode. Dynamic redundancy enhances repair capability.