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CAT28C257 Datasheet(PDF) 6 Page - ON Semiconductor

No. de pieza CAT28C257
Descripción Electrónicos  256 kb CMOS Parallel EEPROM
Download  13 Pages
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Fabricante Electrónico  ONSEMI [ON Semiconductor]
Página de inicio  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT28C257 Datasheet(HTML) 6 Page - ON Semiconductor

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CAT28C257
http://onsemi.com
6
DEVICE OPERATION
Read
Data stored in the CAT28C257 is transferred to the data
bus when WE is held high, and both OE and CE are held low.
The data bus is set to a high impedance state when either CE
or OE goes high. This 2−line control architecture can be used
to eliminate bus contention in a system environment.
Byte Write
A write cycle is executed when both CE and WE are low,
and OE is high. Write cycles can be initiated using either WE
or CE, with the address input being latched on the falling
edge of WE or CE, whichever occurs last. Data, conversely,
is latched on the rising edge of WE or CE, whichever occurs
first. Once initiated, a byte write cycle automatically erases
the addressed byte and the new data is written within 5 ms.
Figure 4. Read Cycle
ADDRESS
DATA OUT
DATA VALID
DATA VALID
HIGH−Z
tOHZ
tHZ
tAA
tOH
tOE
tOLZ
tCE
tLZ
tRC
VIH
CE
OE
WE
Figure 5. Byte Write Cycle [WE Controlled]
ADDRESS
DATA OUT
DATA IN
DATA VALID
HIGH−Z
WE
OE
CE
tAH
tAS
tCS
tCH
tWP
tOES
tOEH
tBLC
tDS
tDH
tWC


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