W27E257 Datasheet, PDF (11/14 Pages) Winbond – 32K X 8 ELECTRICALLY ERASABLE EPROM

SMART ERASE ALGORITHM
Start
X=0
Vcc = 5V
Vpp = 14V
A9 = 14V; A0 = VIL
Chip Erase 100 mS Pulse
Address = First Location
Increment X
Fail
Erase
Verify
Pass
Increment
No
Last
Address
Address?
Yes
Vcc = 5V
Vpp = 5V
Compare
Fail
All Bytes to
FFs (HEX)
Pass
Pass
Device
W27E257
No
X = 20?
Yes
Fail
Device
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Publication Release Date: January 1997
Revision A3