X28C256
A.C. CHARACTERISTICS
(over recommended operating conditions, unless otherwise specified)
Read Cycle Limits
X28C256-20 X28C256-25
Symbol
t
RC
t
CE
t
AA
t
OE
t
LZ(5)
t
OLZ(5)
t
HZ(5)
t
OHZ(5)
t
OH
Parameter
Read Cycle Time
Chip Enable Access Time
Address Access Time
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
Output Hold from
Address Change
Min.
200
200
200
80
0
0
50
50
0
0
0
0
50
50
0
Max.
Min.
250
250
250
100
0
0
50
50
Max.
X28C256
Min.
300
300
300
100
Max.
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
3855 PGM T10.1
Read Cycle
tRC
ADDRESS
tCE
CE
tOE
OE
VIH
WE
tOLZ
tLZ
DATA I/O
HIGH Z
DATA VALID
tAA
3855 FHD F05
tOHZ
tOH
tHZ
DATA VALID
Note:
(5) t
LZ
min., t
HZ
, t
OLZ
min., and t
OHZ
are peridocally sampled and not 100% tested. t
HZ
and t
OHZ
are measured, with C
L
= 5pF, from
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. ]
