Ага, в даташите написано
256 Kbit / 512 Kbit / 1 Mbit / 2 Mbit(xMany-Time Programmable FlashSST27SF256 / SST27SF512 / SST27SF010 / SST27SF020
А еще вот
The entire chip can be erased in a single pulse of 100 ms (CE# pin low for SST27SF256/512 and PGM# pin for SST27SF010/020). In order to activate the Erase mode for SST27SF256/010/020, the 12V (±5%) is applied to VPP and A9 pins, VDD = 5V (±5%), VIL on CE# pin, and VIH on OE# pin. In order to activate Erase mode for SST27SF512, the 12V (±5%) is applied to OE#/VPP and A9 pins, VDD = 5V (±5%), and VIL on CE# pin.
Я думаю надо попробовать![]()