When driven LOW, count sequence follows linear convention. This signal is
internally pulled HIGH.
Flow-through mode.When LOW, enables single register flow-through mode.
Connect to V
DD
if unused or for pipelined operation.
Sleep. Places device in low power mode; data is retained. Connect to GND if unused.
Absolute maximum ratings
Parameter
Power supply voltage relative to GND
Input voltage relative to GND (input pins)
Input voltage relative to GND (I/O pins)
Power dissipation
DC output current
Storage temperature (plastic)
Temperature under bias
Symbol
V
DD
, V
DDQ
V
IN
V
IN
P
D
I
OUT
T
stg
T
bias
Min
–0.5
–0.5
–0.5
–
–
–65
–65
Max
+4.6
V
DD
+ 0.5
V
DDQ
+ 0.5
1.8
50
+150
+135
Unit
V
V
V
W
mA
°
C
°
C
Note: Stresses greater than those listed under
Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress rating only and functional opera-
tion of the device at these or any other conditions outside those indicated in the operational sections of this specification is not implied. Exposure to absolute
maximum rating conditions may affect reliability.
3/8/02; V.1.5
Alliance Semiconductor
P. 3 of 11
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
WEn
X
X
X
X
X
X
X
F
F
F
F
F
F
F
F
F
F
T
T
T
T
T
1
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.
2Q in flow through mode
3
For write operation following a READ,
OE must be HIGH before the input data set up time and held HIGH throughout the input hold time.
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