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CAT28C257T13A-15T Arkusz danych(PDF) 6 Page - Catalyst Semiconductor

Numer części CAT28C257T13A-15T
Szczegółowy opis  256K-Bit CMOS PARALLEL E2PROM
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CAT28C257
6
Doc. No. 25073-00 2/98
Advanced
ADDRESS
CE
OE
WE
tRC
DATA OUT
DATA VALID
DATA VALID
tCE
tOE
tOH
tAA
tOHZ
tHZ
VIH
HIGH-Z
tLZ
tOLZ
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 3. Read Cycle
Figure 4. Byte Write Cycle [WE Controlled]
ADDRESS
CE
OE
WE
DATA OUT
tAS
DATA IN
DATA VALID
HIGH-Z
tCS
tAH
tCH
tWC
tOEH
tBLC
tDH
tDS
tOES
tWP
5096 FHD F06
28C257 F06


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