w27c520 Winbond Electronics Corp America, w27c520 Datasheet - Page 9

• Manufacturer Part Number: w27c520
• Description: 64k X 8 Electrically Erasable Eprom
• Manufacturer: Winbond Electronics Corp America

Timing Waveforms, continued
Erase Waveform 1
Erase Waveform 2
Note: First command Address = 5555(hex) with Data = AA(hex)
OE/Vpp
AD[7:0]
A[15:8]
ALE
Second command Address = 2AAA(hex) with Data = 10(hex)
13.0V
V
V
V
V
V
V
V
V
IH
IH
IH
IH
IL
IL
IL
IL
OE/Vpp
A[15:8]
AD[7:0]
ALE
13.0V
Read
Company
SID
V
V
V
A8=V
V
V
V
V
V
Others=V
IH
IL
IH
IH
IL
IH
IL
IL
V
A9=12.0
V
DA
IL
DD
T
OES
=5.0V
IL
Read
Device
SID
or V
A8=V
Read
Company
SID
A8 = V
A9 = 12.0V
IH
V
Others = V
1F
DD
T
IH
T
PRT
= 3.3 or 5.0V
LAS
DA
IL
T
ALE
T
IL
A8 = V
55
RPT
Read
Device
SID
T
or V
T
VS
LAH
Command 1
V
DD
IH
T
IH
1F
AS
T
=6.5V
PRT
T
T
OES
T
T
EPW1
A[15:8] = 55
AA
OES
DS
Others = V
A8, A11 = V
A10 = V
- 9 -
Chip Erase
Chip Erase
T
V
T
A9 = 13.0V
OEH
DH
DD
IH
T
= 6.5V
EPW
IL
IL
or V
AA
T
IH
OEH
Command 2
V
DD
Preliminary W27C520
=6.5V
Publication Release Date: October 2000
T
A[15:8] = 2A
EPW2
10
Add
T
Address Valid
VR
Erase (Verify)
V
DD
= 6.5V
D
OUT
T
EOE
Add
Address Valid
Erase Verify
V
DD
D
=6.5V
OUT
T
EOE
Revision A1