View v29lc51000 datasheet:

PRELIMINARY MOSEL VITELIC V29LC51000 512 KILOBIT (65,536 x 8 BIT) 5 VOLT CMOS FLASH MEMORY Features Description The V29LC51000 is a high speed 65,536 x 8 bit 64Kx8-bit Organization CMOS flash memory. Programming or erasing the Address Access Time: 90 ns device is done with a single 5 Volt power supply. Single 5V ± 10% Power Supply The device has separate chip enable CE, program Sector Erase Mode Operation enable WE, and output enable OE controls to 512 bytes per Sector, 128 Sectors eliminate bus contention. – Sector-Erase Cycle Time: 10ms (Max) The V29LC51000 features a sector erase – Byte-Program Cycle Time: 30µ s (Max) operation which allows each sector to be erased Minimum 1,000 Erase-Program Cycles and reprogrammed without affecting data stored in Low powe