View sst39sf040-03 datasheet:

4 Megabit (512K x8) Multi-Purpose Flash SST39SF040 Preliminary Specifications FEATURES: • Organized as 512K X8 • Fast Erase and Byte-Program: 1 – Sector-Erase Time: 18 ms typical • Single 5.0V Read and Write Operations – Chip-Erase Time: 70 ms typical • Superior Reliability – Byte-Program Time: 14 µs typical – Endurance: 100,000 Cycles (typical) – Chip Rewrite Time: 8 seconds typical 2 – Greater than 100 years Data Retention • Automatic Write Timing • Low Power Consumption: – Internal V Generation PP – Active Current: 10 mA (typical) 3 • End-of-Write Detection – Standby Current: 30 µA (typical) – Toggle Bit • Sector-Erase Capability – Data# Polling 4 – Uniform 4 KByte sectors • TTL I/O Compatibility • Fast Read Access Time: • JEDEC Standard – 45, 55 and 70 n