W27C520 Datasheet, PDF (13/16 Pages) Winbond – 64K X 8 ELECTRICALLY ERASABLE EPROM

Preliminary W27C520
SMART ERASE ALGORITHM 2
Start
X=0
VDD = 6.5V
OE/Vpp = 13V
Program One 50µ S Pulse
with Address = 5555(Hex) Data = AA(Hex)
Program One 100 mS Pulse
with Address = 2AAA(Hex) Data = 10(Hex)
Increment X
V_DD = 6.5V
OE/Vpp = VIL
Increment ^No
Address
Erase
Fail
Verify
Pass
Last
Address?
Yes
Power
Down
VDD = 3.3 or 5.0V
OE/Vpp = VIL
Compare
All Bytes to
Fail
FFs (HEX)
Pass
Pass
Device
No
X = 20?
Yes
Fail
Device
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Publication Release Date: October 2000
Revision A1