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CAT28C256H13IA-15T Arkusz danych(PDF) 7 Page - ON Semiconductor

Numer części CAT28C256H13IA-15T
Szczegółowy opis  256 kb Parallel EEPROM
Download  14 Pages
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Producent  ONSEMI [ON Semiconductor]
Strona internetowa  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT28C256H13IA-15T Arkusz danych(HTML) 7 Page - ON Semiconductor

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CAT28C256
http://onsemi.com
7
Page Write
The page write mode of the CAT28C256 (essentially an
extended BYTE WRITE mode) allows from 1 to 64 bytes of
data to be programmed within a single EEPROM write
cycle. This effectively reduces the byte−write time by a
factor of 64.
Following an initial WRITE operation (WE pulsed low,
for tWP, and then high) the page write mode can begin by
issuing sequential WE pulses, which load the address and
data bytes into a 64 byte temporary buffer. The page address
where data is to be written, specified by bits A6 to A14, is
latched on the last falling edge of WE. Each byte within the
page is defined by address bits A0 to A5 (which can be loaded
in any order) during the first and subsequent write cycles.
Each successive byte load cycle must begin within tBLCMAX
of the rising edge of the preceding WE pulse. There is no
page write window limitation as long as WE is pulsed low
within tBLC MAX.
Upon completion of the page write sequence, WE must
stay high a minimum of tBLC MAX for the internal automatic
program cycle to commence. This programming cycle
consists of an erase cycle, which erases any data that existed
in each addressed cell, and a write cycle, which writes new
data back into the cell. A page write will only write data to
the locations that were addressed and will not rewrite the
entire page.
Figure 6. Byte Write Cycle [CE Controlled]
ADDRESS
DATA OUT
DATA IN
DATA VALID
HIGH−Z
WE
OE
CE
tAS
tAH
tCS
tOES
tCW
tOEH
tCH
tBLC
tDS
tDH
tWC
Figure 7. Page Mode Write Cycle
ADDRESS
I/O
BYTE 0
BYTE 1
BYTE 2
BYTE n
BYTE n+1
BYTE n+2
LAST BYTE
WE
CE
OE
tWC
tBLC
tWP


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