6.6.1 Hardware Data Protection

Hardware features protect against inadvertent writes to the AT28C64B in the following ways:

V_CC sense – if V_CC is below 3.8V (typical), the write function is inhibited
V_CC power‑on delay – once V_CC has reached 3.8V, the device will automatically time out 5 ms (typical) before allowing a write
Write inhibit – holding any one of OE low, CE high or WE high inhibits write cycles
Noise filter – pulses of less than 15 ns (typical) on the WE or CE inputs will not initiate a write cycle

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