参数资料
型号: W28J800BT90L
厂商: WINBOND ELECTRONICS CORP
元件分类: PROM
英文描述: 512K X 16 FLASH 2.7V PROM, 90 ns, PDSO48
封装: 12 X 20 MM, TSOP-48
文件页数: 45/49页
文件大小: 1527K
代理商: W28J800BT90L
W28J800B/T
Publication Release Date: April 11, 2003
- 5 -
Revision A4
Overwriting a "0" to a bit already holding a data "0" may render this bit un-erasable. In order to avoid
this potential "stuck bit" failure, when re-programming (changing data from "1" to "0") the following
should be followed:
Program "0" for the bit in which you want to change data from "1" to "0".
Program "1" for the bit which is already holding a data "0". (Note: Since only an erase process
can change the data from "0" to "1", programming "1" to a bit holding a data "0" will not
change the data).
For example, changing data from "10111101" to "10111100" requires "11111110" programming.
4. BLOCK DIAGRAM
Comparator
Y-Gating
32K-Word
(64K-Byte)
Main Blocks
Output Buffer
DQ0 -DQ15
Input Buffer
Identifier
Register
Output
Multiplexer
Status
Register
Data
Register
Command
User
Interface
I/O Logic
Data
Input
Buffer
Address
Latch
Address
Counter
Y
Decoder
X
Decoder
Write
State
Machine
Program/Erase
Voltage Switch
x 15
VDD
#BYTE
#CE
#WE
#OE
#RESET
#WP
RY/#BY
VPP
VDD
VSS
A1-A18
P
ara
m
ete
rB
lo
ck
0
P
ara
m
ete
rB
lo
ck
1
P
ara
m
ete
rB
lo
ck
2
P
ara
m
ete
rB
lo
ck
3
P
ara
m
ete
rB
lo
ck
4
P
ara
m
ete
rB
lo
ck
5
Boot
Bloc
k0
Boot
Bloc
k1
Main
Bloc
k13
Main
Bloc
k14
O
T
P
Bloc
k
M
ai
nB
lo
ck
0
M
ai
nB
lo
ck
1
Figure 1. Block Diagram
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