X28C256
A.C. CHARACTERISTICS (over recommended operating conditions, unless otherwise specified)
Read Cycle Limits
X28C256-20 X28C256-25
X28C256
Symbol
Parameter
Min. Max. Min. Max. Min. Max. Units
t
t
t
t
t
t
t
t
t
Read Cycle Time
200
250
300
ns
ns
ns
ns
ns
ns
ns
ns
ns
RC
CE
AA
OE
Chip Enable Access Time
Address Access Time
200
200
80
250
250
100
300
300
100
Output Enable Access Time
CE LOW to Active Output
OE LOW to Active Output
CE HIGH to High Z Output
OE HIGH to High Z Output
(5)
0
0
0
0
0
0
LZ
(5)
OLZ
(5)
50
50
50
50
50
50
HZ
(5)
OHZ
OH
Output Hold from
Address Change
0
0
0
3855 PGM T10.1
Read Cycle
t
RC
ADDRESS
CE
t
CE
t
OE
OE
V
IH
WE
t
t
OLZ
OHZ
t
t
t
LZ
OH
HZ
HIGH Z
DATA I/O
DATA VALID
DATA VALID
t
AA
3855 FHD F05
Note: (5) t min., t , t
min., and t
are peridocally sampled and not 100% tested. t and t
are measured, with C = 5pF, from
OHZ L
LZ
HZ OLZ
OHZ
HZ
the point when CE or OE return HIGH (whichever occurs first) to the time when the outputs are no longer driven.
12
XICOR [ XICOR INC. ]
