AS7C33256PFS16A
AS7C33256PFS18A
®
Synchronous truth table
CE0
H
L
L
L
L
L
L
L
L
X
X
X
X
H
H
H
H
L
X
H
X
H
CE1
X
L
L
X
X
H
H
H
H
X
X
X
X
X
X
X
X
H
X
X
X
X
CE2
X
X
X
H
H
L
L
L
L
X
X
X
X
X
X
X
X
L
X
X
X
X
ADSP
X
L
H
L
H
L
L
H
H
H
H
H
H
X
X
X
X
H
H
X
H
X
ADSC
L
X
L
X
L
X
X
L
L
H
H
H
H
H
H
H
H
L
H
H
H
H
ADV
X
X
X
X
X
X
X
X
X
L
L
H
H
L
L
H
H
X
L
L
H
H
WEn1
X
X
X
X
X
X
X
F
F
F
F
F
F
F
F
F
F
T
T
T
T
T
OE
X
X
X
X
X
L
H
L
H
L
H
L
H
L
H
L
H
X
X
X
X
X
Address accessed
NA
NA
NA
NA
NA
External
External
External
External
Next
Next
Current
Current
Next
Next
Current
Current
External
Next
Next
Current
Current
CLK
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
L to H
Operation
Deselect
Deselect
Deselect
Deselect
Deselect
Begin read
Begin read
Begin read
Begin read
Cont. read
Cont. read
Suspend read
Suspend read
Cont. read
Cont. read
Suspend read
Suspend read
Begin write
Cont. write
Cont. write
Suspend write
Suspend write
DQ
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
2
Hi−Z
Hi−Z
2
Hi−Z
Q
Hi−Z
Q
Hi−Z
Q
Hi−Z
Q
Hi−Z
D
3
D
D
D
D
Key: X = Don’t Care, L = Low, H = High.
1
See “Write enable truth table” on page 2 for more information.
2
Q in flow through mode
3For write operation following a READ,
OE must be HIGH before
the input data set up time and held HIGH throughout the input hold
time.
Recommended operating conditions
Parameter
Supply voltage
3.3V I/O supply
voltage
2.5V I/O supply
voltage
Address and
control pins
I/O pins
Ambient operating temperature
Symbol
V
DD
V
SS
V
DDQ
V
SSQ
V
DDQ
V
SSQ
V
IH
V
IL
V
IH
V
IL
T
A
Min
3.135
0.0
3.135
0.0
2.35
0.0
2.0
–0.5
*
2.0
–0.5
*
0
Nominal
3.3
0.0
3.3
0.0
2.5
0.0
–
–
–
–
–
Max
3.6
0.0
3.6
0.0
2.9
0.0
V
DD
+ 0.3
0.8
V
DDQ
+ 0.3
0.8
70
Unit
V
V
V
V
V
°C
Input voltages
†
* V
IL
min = –2.0V for pulse width less than 0.2 × t
RC
.
† Input voltage ranges apply to 3.3V I/O operation. For 2.5V I/O operation, contact factory for input specifications.
3/14/01; V.1.0
Alliance Semiconductor
P. 4 of 11
ALSC [ ALLIANCE SEMICONDUCTOR CORPORATION ]
