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CAT28C256NI-15T Datasheet(PDF) 8 Page - ON Semiconductor

Part # CAT28C256NI-15T
Description  256 kb Parallel EEPROM
Download  14 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT28C256NI-15T Datasheet(HTML) 8 Page - ON Semiconductor

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CAT28C256
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8
DATA Polling
DATA polling is provided to indicate the completion of
write cycle. Once a byte write or page write cycle is initiated,
attempting to read the last byte written will output the
complement of that data on I/O7 (I/O0–I/O6 are
indeterminate) until the programming cycle is complete.
Upon completion of the self−timed write cycle, all I/O’s will
output true data during a read cycle.
Toggle Bit
In addition to the DATA Polling feature of the
CAT28C256, the device offers an additional method for
determining the completion of a write cycle. While a write
cycle is in progress, reading data from the device will result
in I/O6 toggling between one and zero. However, once the
write is complete, I/O6 stops toggling and valid data can be
read from the device.
Figure 8. DATA Polling
ADDRESS
I/O7
WE
OE
CE
DIN = X
DOUT = X
DOUT = X
tOEH
tOE
tWC
tOES
Figure 9. Toggle Bit
tOES
tOE
tWC
tOEH
I/O6
OE
CE
WE
(Note 14)
(Note 14)
14.Beginning and ending state of I/O6 is indeterminate.


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