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CAT28C257LA-12T Arkusz danych(PDF) 8 Page - Catalyst Semiconductor

Numer części CAT28C257LA-12T
Szczegółowy opis  256K-Bit CMOS PARALLEL EEPROM
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Producent  CATALYST [Catalyst Semiconductor]
Strona internetowa  http://www.catalyst-semiconductor.com
Logo CATALYST - Catalyst Semiconductor

CAT28C257LA-12T Arkusz danych(HTML) 8 Page - Catalyst Semiconductor

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CAT28C257
8
Doc. No. 1015, Rev. D
WE
CE
OE
I/O6
tOEH
tOE
tOES
tWC
(1)
(1)
ADDRESS
CE
WE
OE
I/O7
DIN = X
DOUT = X
DOUT = X
tOE
tOEH
tWC
tOES
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 CAT28C257,
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 7. DATA Polling
Figure 8. Toggle Bit
Note:
(1)
Beginning and ending state of I/O6 is indeterminate.


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