X28C256D Xicor, X28C256D Datasheet - Page 14

• Manufacturer Part Number: X28C256D
• Description: 5 Volt/ Byte Alterable E2PROM
• Manufacturer: Xicor

X28C256
CE Controlled Write Cycle
Page Write Cycle
Notes: (10) Between successive byte writes within a page write operation, OE can be strobed LOW: e.g. this can be done with CE and WE
DATA OUT
ADDRESS
ADDRESS*
DATA IN
(11) The timings shown above are unique to page write operations. Individual byte load operations within the page write must
WE
CE
OE
OE
HIGH to fetch data from another memory device within the system for the next write; or with WE HIGH and CE LOW effectively
performing a polling operation.
conform to either the CE or WE controlled write cycle timing.
WE
CE
(10)
(11)
I/O
*For each successive write within the page write operation, A 6 –A 14 should be the same or
writes to an unknown address could occur.
t OES
t WP
t AS
t CS
BYTE 0
t DV
t WPH
BYTE 1
t AH
t BLC
t CW
HIGH Z
t DS
DATA VALID
BYTE 2
14
t OEH
t WC
BYTE n
t CH
t DH
BYTE n+1
LAST BYTE
BYTE n+2
t WC
3855 FHD F07
3855 FHD F08