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CAT28C64BPI-15T Scheda tecnica(PDF) 8 Page - Catalyst Semiconductor

Il numero della parte CAT28C64BPI-15T
Spiegazioni elettronici  64K-Bit CMOS PARALLEL E2PROM
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Produttore elettronici  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
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CAT28C64BPI-15T Scheda tecnica(HTML) 8 Page - Catalyst Semiconductor

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CAT28C64B
8
Doc. No. 25006-0A 2/98 P-1
Page Write
The page write mode of the CAT28C64B (essentially an
extended BYTE WRITE mode) allows from 1 to 32 bytes
of data to be programmed within a single E2PROM write
cycle. This effectively reduces the byte-write time by a
factor of 32.
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 32 byte temporary buffer. The page
address where data is to be written, specified by bits A5
to A12, is latched on the last falling edge of WE. Each
byte within the page is defined by address bits A0 to A4
(which can be loaded in any order) during the first and
subsequent write cycles. Each successive byte load
cycle must begin within tBLC MAX 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 auto-
matic 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 5. Byte Write Cycle [CE Controlled]
5094 FHD F07
Figure 6. Page Mode Write Cycle
OE
CE
WE
ADDRESS
I/O
tWP
tBLC
BYTE 0
BYTE 1
BYTE 2
BYTE n
BYTE n+1
BYTE n+2
LAST BYTE
tWC
5096 FHD F10
ADDRESS
CE
OE
WE
DATA OUT
tAS
DATA IN
DATA VALID
HIGH-Z
tAH
tWC
tOEH
tDH
tDS
tOES
tBLC
tCH
tCS
tCW


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