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X28HC256SZ-12 参数 Datasheet PDF下载

X28HC256SZ-12图片预览
型号: X28HC256SZ-12
PDF下载: 下载PDF文件 查看货源
内容描述: 低功耗CMOS EEPROM与高速页写能力256K EEPROM [LOW POWER CMOS EEPROM with hi-speed page write capability 256K EEPROM]
分类和应用: 内存集成电路光电二极管可编程只读存储器电动程控只读存储器电可擦编程只读存储器
文件页数/大小: 21 页 / 977 K
品牌: ROCHESTER [ Rochester Electronics ]
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X28HC256
DATA Polling I/O
7
WE
LAST
WRITE
CE
OE
V
IH
I/O
7
HIGH Z
V
OL
V
OH
X28HC256
READY
An
An
An
An
A
0
TO A
14
An
An
An
FIGURE 2. DATA POLLING BUS SEQUENCE
WRITE DATA
DATA Polling can effectively halve the time for writing to the
X28HC256. The timing diagram in Figure 2 illustrates the
sequence of events on the bus. The software flow diagram in
Figure 3 illustrates one method of implementing the routine.
WRITES
COMPLETE?
NO
YES
SAVE LAST DATA
AND ADDRESS
READ LAST
ADDRESS
IO
7
COMPARE?
YES
NO
X28HC256
READY
FIGURE 3. DATA POLLING SOFTWARE FLOW
6
FN8108.2
May 7, 2007