View v29c51000t datasheet:

PRELIMINARY MOSEL VITELIC V29C51000T/V29C51000B 512K BIT (65,536 x 8 BIT) 5 VOLT CMOS FLASH MEMORY Features Description The V29C51000T/V29C51000B is a high speed 64Kx8-bit Organization 65,536 x 8 bit CMOS flash memory. Programming Address Access Time: 45, 70, 90 ns or erasing the device is done with a single 5 Volt Single 5V ± 10% Power Supply power supply. The device has separate chip enable Sector Erase Mode Operation CE, program enable WE, and output enable OE 8KB Boot Block (lockable) controls to eliminate bus contention. 512 bytes per Sector, 128 Sectors The V29C51000T/V29C51000B offers a combi- – Sector-Erase Cycle Time: 10ms (Max) nation of features: Boot Block with Sector Erase – Byte-Program Cycle Time: 20µ s (Max) Mode. The end of program/erase cycle i