w27c020 Winbond Electronics Corp America, w27c020 Datasheet - Page 8

• Manufacturer Part Number: w27c020
• Description: 256k X 8 Electrically Erasable Eprom
• Manufacturer: Winbond Electronics Corp America

TIMING WAVEFORMS
AC Read Waveform
Erase Waveform
Address
Data
Address
PGM
Outputs
V
CE
OE
PP
CE
OE
14.0V
5.0V
V
V
V
V
V
V
IH
IH
IL
IH
IL
IL
V
V
V
V
V
V
IH
IL
IH
IL
IH
IL
Manufacturer
T
High Z
CE
T
OE
T
A0 = V
AS
Read
Others = V
SID
DA
A9 = 12.0V
IL
T
OE
Others=V IL
T
AS
Device
IL
A0=V IH
SID
Read
01
T
CES
T
VPS
T
T
AS
Others = V
DS
A9 = 14.0V
Chip Erase
Data All One
T
T
T
ACC
PWE
AHC
Address Valid
IL
- 8 -
T
CE
T
T
OES
DH
T
OE
Address
Stable
Erase Verify
T
T
OEV
DFP
D
OUT
T
AH
Preliminary W27C020
Address
Stable
Valid Output
D
OUT
T
OH
T
ACC
T
Blank Check
Read Verify
OE
Address
Stable
T
DF
D
OUT
High Z
5V