
X84256
Preliminary
8
A.C. CHARACTERISTICS
(Over the recommended operating conditions, unless otherwise specified.)
Read Cycle Limits – X84256
Notes:
(4) Periodically sampled, but not 100% tested. t
HZ
and t
OHZ
are measured from the point where CE or OE goes HIGH (whichever occurs
first) to the time when I/O is no longer being driven into a 5pF load.
Symbol
t
RC
t
CE
t
OE
t
OEL
t
OEH
t
LOW
t
HIGH
Parameter
V
CC
= 5V±10%
Min.
V
CC
= 2.5V – 5.5V V
CC
= 1.8V – 3.6V
Min.
Max.
Units
Max
Min.
Max.
Read Cycle Time
100
200
330
ns
CE Access Time
25
50
70
ns
OE Access Time
25
50
70
ns
OE Pulse Width
50
60
90
ns
OE High Recovery Time
50
60
90
ns
CE LOW Time
50
70
90
ns
CE HIGH Time
50
120
180
ns
t
LZ
(4)
CE LOW to Output In Low Z
0
0
0
ns
t
HZ
(4)
CE HIGH to Output In High Z
0
25
0
30
0
35
ns
t
OLZ
(4)
OE LOW to Output In Low Z
0
0
0
ns
t
OHZ
(4)
t
OH
t
WES
t
WEH
OE HIGH to Output In High Z
0
25
0
30
0
35
ns
Output Hold from CE or OE HIGH
0
0
0
ns
WE HIGH Setup Time
25
25
25
ns
WE HIGH Hold Time
25
25
25
ns
CE
WE
tWES
OE
tHIGH
tCE
tOE
tOLZ
tLZ
tOH
tWEH
HIGH Z
DATA
tOHZ
tHZ
tLOW
tRC
I/O
OEL
t
tOEH