March 2001
Copyright Alliance Semiconductor. All rights reserved.
AS7C33256PFS16A
AS7C33256PFS18A
3.3V 256K
16/18 pipeline burst synchronous SRAM
3/14/01; V.1.0
Alliance Semiconductor
P. 1 of 11
Features
Organization: 262,144 words 16 or 18 bits
Fast clock speeds to 166 MHz in LVTTL/LVCMOS
Fast clock to data access: 3.5/3.8/4.0/5.0 ns
Fast OE access time: 3.5/3.8/4.0/5.0 ns
Fully synchronous register-to-register operation
"Flow-through" mode
Single-cycle deselect
- Dual-cycle deselect also available (AS7C33256PFD16A/
AS7C33256PFD18A)
Pentium
*
compatible architecture and timing
Asynchronous output enable control
Economical 100-pin TQFP package
Byte write enables
Multiple chip enables for easy expansion
3.3V core power supply
2.5V or 3.3V I/O operation with separate V
DDQ
30 mW typical standby power in power down mode
NTDTM
*
pipeline architecture available
(AS7C33256NTD16A/AS7C33256NTD18A)
Selection guide
*
Pentium
is a registered trademark of Intel Corporation. NTDTM is a trademark of Alliance Semiconductor Corporation. All trademarks mentioned in this document are
the property of their respective owners.
AS7C33256PFS16A
166
AS7C33256PFS16A
150
AS7C33256PFS16A
133
AS7C33256PFS16A
100
Units
Minimum cycle time
6
6.7
7.5
10
ns
Maximum pipelined clock frequency
166
150
133
100
MHz
Maximum pipelined clock access time
3.5
3.8
4
5
ns
Maximum operating current
475
450
425
325
mA
Maximum standby current
130
110
100
90
mA
Maximum CMOS standby current (DC)
30
30
30
30
mA
Logic block diagram
Burst logic
ADV
ADSC
ADSP
CLK
LBO
CLK
CLR
CS
18
16
18
A[17:0]
18
Address
D
Q
CS
CLK
register
256K 16/18
Memory
array
16/18
16/18
DQb
CLK
D
Q
Byte Write
registers
DQa
CLK
D
Q
Byte Write
registers
Enable
CLK
D
Q
register
Enable
CLK
D
Q
delay
register
CE
Output
registers
Input
registers
Power
down
DATA [17:0]
2
CE0
CE1
CE2
BW
b
BW
a
OE
ZZ
OE
FT
CLK
CLK
DATA [15:0]
BWE
GWE
Pin arrangement
LBO
A5
A4
A3
A2
A1
A0
NC
NC
V
SS
V
DD
NC
NC
A10
A11
A12
A13
A14
A15
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
A6
A7
CE0
CE1
NC
NC
BW
b
BW
a
CE2
V
DD
V
SS
CLK
GWE
BW
E
OE
AD
S
C
AD
S
P
AD
V
A8
A9
A16
NC
NC
NC
V
DDQ
V
SSQ
NC
NC
DQb
DQb
V
SSQ
V
DDQ
DQb
DQb
FT
V
DD
NC
V
SS
DQb
DQb
V
DDQ
V
SSQ
DQb
DQb
DQpb/NC
NC
V
SSQ
V
DDQ
NC
NC
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
A17
NC
NC
V
DDQ
V
SSQ
NC
DQpa/NC
DQa
DQa
V
SSQ
V
DDQ
DQa
DQa
VSS
ZZ
DQa
DQa
V
DDQ
V
SSQ
DQa
DQa
NC
NC
V
SSQ
V
DDQ
NC
NC
NC
NC
V
DD
TQFP 14 20mm
Note: pins 24, 74 are NC for 16.
AS7C33256PFS16A
AS7C33256PFS18A
3/14/01; V.1.0
Alliance Semiconductor
P. 2 of 11
Functional description
The AS7C33256PFS16A and AS7C33256PFS18A are high performance CMOS 4 Mbit synchronous Static Random Access Memory (SRAM)
devices organized as 262,144 words 16 or 18 bits and incorporate a pipeline for highest frequency on any given technology.
Timing for this device is compatible with existing Pentium
synchronous cache specifications. This architecture is suited for ASIC, DSP
(TMS320C6X), and PowerPC
TM
*
-based systems in computing, datacomm, instrumentation, and telecommunications systems.
Fast cycle times of 6/6.7/7.5/10 ns with clock access times (t
CD
) of 3.5/3.8/4.0/5.0 ns enable 166, 150, 133 and 100 MHz bus frequencies.
Three chip enable inputs permit easy memory expansion. Burst operation is initiated in one of two ways: the controller address strobe (ADSC),
or the processor address strobe (ADSP). The burst advance pin (ADV) allows subsequent internally generated burst addresses.
Read cycles are initiated with ADSP (regardless of WE and ADSC) using the new external address clocked into the on-chip address register.
When ADSP is sampled LOW, the chip enables are sampled active, and the output buffer is enabled with OE. In a read operation the data
accessed by the current address, registered in the address registers by the positive edge of CLK, are carried to the data-out registers and driven
on the output pins on the next positive edge of CLK. ADV is ignored on the clock edge that samples ADSP asserted but is sampled on all
subsequent clock edges. Address is incremented internally for the next access of the burst when ADV is sampled LOW and both address strobes
are HIGH. Burst operation is selectable with the
LBO
input. With
LBO
unconnected or driven HIGH, burst operations use a Pentium
count
sequence. With
LBO
driven LOW the device uses a linear count sequence suitable for PowerPC
TM
and many other applications.
Write cycles are performed by disabling the output buffers with OE and asserting a write command. A global write enable GWE writes all 16/
18 bits regardless of the state of individual BW[a:b] inputs. Alternately, when GWE is HIGH, one or more bytes may be written by asserting
BWE and the appropriate individual byte BWn signal(s).
BWn is ignored on the clock edge that samples ADSP LOW, but is sampled on all subsequent clock edges. Output buffers are disabled when
BWn is sampled LOW (regardless of OE). Data is clocked into the data input register when BWn is sampled LOW. Address is incremented
internally to the next burst address if BWn and ADV are sampled LOW.
Read or write cycles may also be initiated with ADSC instead of ADSP. The differences between cycles initiated with ADSC and ADSP follow.
ADSP must be sampled HIGH when ADSC is sampled LOW to initiate a cycle with ADSC.
WE
signals are sampled on the clock edge that samples ADSC LOW (and ADSP HIGH).
Master chip select CE0 blocks ADSP, but not ADSC.
The AS7C33256PFS16A and AS7C33256PFS18A operate from a 3.3V supply. I/Os use a separate power supply that can operate at 2.5V or 3.3V.
These devices are available in a 100-pin 1420 mm TQFP packaging.
*PowerPC
TM
is a tradenark International Business Machines Corporation.
Capacitance
Write enable truth table (per byte)
Key:
X = Don't Care, L = Low, H = High, T=True, F=False
* valid read
n = a,b
WE
,
WEn
= internal write signal
Parameter
Symbol
Signals
Test conditions
Max
Unit
Input capacitance
C
IN
Address and control pins
V
IN
= 0V
5
pF
I/O capacitance
C
I/O
I/O pins
V
IN
= V
OUT
= 0V
7
pF
GWE
BWE
BWn
WEn
L
X
X
T
H
L
L
T
H
H
X
F*
H
L
H
F*
AS7C33256PFS16A
AS7C33256PFS18A
3/14/01; V.1.0
Alliance Semiconductor
P. 3 of 11
Signal descriptions
Absolute maximum ratings
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
operation 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.
Signal
I/O
Properties
Description
CLK
I
CLOCK
Clock. All inputs except OE, FT, ZZ, LBO are synchronous to this clock.
A0A17
I
SYNC
Address. Sampled when all chip enables are active and ADSC or ADSP are asserted.
DQ[a,b]
I/O
SYNC
Data. Driven as output when the chip is enabled and OE is active.
CE0
I
SYNC
Master chip enable. Sampled on clock edges when ADSP or ADSC is active. When
CE0 is inactive, ADSP is blocked. Refer to the Synchronous Truth Table for more
information.
CE1, CE2
I
SYNC
Synchronous chip enables. Active HIGH and active LOW, respectively. Sampled on
clock edges when ADSC is active or when CE0 and ADSP are active.
ADSP
I
SYNC
Address strobe (processor). Asserted LOW to load a new address or to enter
standby mode.
ADSC
I
SYNC
Address strobe (controller). Asserted LOW to load a new address or to enter
standby mode.
ADV
I
SYNC
Burst advance. Asserted LOW to continue burst read/write.
GWE
I
SYNC
Global write enable. Asserted LOW to write all 16/18 bits. When HIGH, BWE and
BW[a,b] control write enable.
BWE
I
SYNC
Byte write enable. Asserted LOW with GWE = HIGH to enable effect of BW[a,b]
inputs.
BW[a,b]
I
SYNC
Write enables. Used to control write of individual bytes when GWE = HIGH and
BWE = LOW. If any of BW[a,b] is active with GWE = HIGH and BWE = LOW the
cycle is a write cycle. If all BW[a,b] are inactive, the cycle is a read cycle.
OE
I
ASYNC
Asynchronous output enable. I/O pins are driven when OE is active and the chip is
in read mode.
LBO
I
STATIC default =
HIGH
Count mode. When driven HIGH, count sequence follows Intel XOR convention.
When driven LOW, count sequence follows linear convention. This signal is
internally pulled HIGH.
FT
I
STATIC
Flow-through mode.When LOW, enables single register flow-through mode.
Connect to V
DD
if unused or for pipelined operation.
ZZ
I ASYNC
Sleep. Places device in low power mode; data is retained. Connect to GND if
unused.
Parameter
Symbol
Min
Max
Unit
Power supply voltage relative to GND
V
DD
, V
DDQ
0.5
+4.6
V
Input voltage relative to GND (input pins)
V
IN
0.5
V
DD
+ 0.5
V
Input voltage relative to GND (I/O pins)
V
IN
0.5
V
DDQ
+ 0.5
V
Power dissipation
P
D
1.8
W
DC output current
I
OUT
50
mA
Storage temperature (plastic)
T
stg
65
+150
C
Temperature under bias
T
bias
65 +135
C
AS7C33256PFS16A
AS7C33256PFS18A
3/14/01; V.1.0
Alliance Semiconductor
P. 4 of 11
Synchronous truth table
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
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.
Recommended operating conditions
CE0
CE1
CE2
ADSP
ADSC
ADV
WEn1
OE
Address accessed
CLK
Operation
DQ
H
X
X
X
L
X
X
X
NA
L to H
Deselect
Hi
-
Z
L
L
X
L
X
X
X
X
NA
L to H
Deselect
Hi
-
Z
L
L
X
H
L
X
X
X
NA
L to H
Deselect
Hi
-
Z
L
X
H
L
X
X
X
X
NA
L to H
Deselect
Hi
-
Z
L
X
H
H
L
X
X
X
NA
L to H
Deselect
Hi
-
Z
L
H
L
L
X
X
X
L
External
L to H
Begin read
Hi
-
Z
2
L
H
L
L
X
X
X
H
External
L to H
Begin read
Hi
-
Z
L
H
L
H
L
X
F
L
External
L to H
Begin read
Hi
-
Z
2
L
H
L
H
L
X
F
H
External
L to H
Begin read
Hi
-
Z
X
X
X
H
H
L
F
L
Next
L to H
Cont. read
Q
X
X
X
H
H
L
F
H
Next
L to H
Cont. read
Hi
-
Z
X
X
X
H
H
H
F
L
Current
L to H
Suspend read
Q
X
X
X
H
H
H
F
H
Current
L to H
Suspend read
Hi
-
Z
H
X
X
X
H
L
F
L
Next
L to H
Cont. read
Q
H
X
X
X
H
L
F
H
Next
L to H
Cont. read
Hi
-
Z
H
X
X
X
H
H
F
L
Current
L to H
Suspend read
Q
H
X
X
X
H
H
F
H
Current
L to H
Suspend read
Hi
-
Z
L
H
L
H
L
X
T
X
External
L to H
Begin write
D
3
X
X
X
H
H
L
T
X
Next
L to H
Cont. write
D
H
X
X
X
H
L
T
X
Next
L to H
Cont. write
D
X
X
X
H
H
H
T
X
Current
L to H
Suspend write
D
H
X
X
X
H
H
T
X
Current
L to H
Suspend write
D
Parameter
Symbol
Min
Nominal
Max
Unit
Supply voltage
V
DD
3.135
3.3
3.6
V
V
SS
0.0
0.0
0.0
3.3V I/O supply
voltage
V
DDQ
3.135
3.3
3.6
V
V
SSQ
0.0
0.0
0.0
2.5V I/O supply
voltage
V
DDQ
2.35
2.5
2.9
V
V
SSQ
0.0
0.0
0.0
Input voltages
Address and
control pins
V
IH
2.0
V
DD
+ 0.3
V
V
IL
0.5
*
* 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.
0.8
I/O pins
V
IH
2.0
V
DDQ
+ 0.3
V
V
IL
0.5
*
0.8
Ambient operating temperature
T
A
0
70
C
AS7C33256PFS16A
AS7C33256PFS18A
3/14/01; V.1.0
Alliance Semiconductor
P. 5 of 11
TQFP thermal resistance
* This parameter is sampled.
DC electrical characteristics
DC electrical characteristics for 2.5V I/O operation
Timing characteristics over operating range
Description
Conditions
Symbol
Typical
Units
Thermal resistance
(junction to ambient)
*
Test conditions follow standard test
methods and procedures for measuring
thermal impedance, per EIA/JESD51
JA
46
C/W
Thermal resistance
(junction to top of case)
*
JC
2.8
C/W
Parameter
Symbol
Test conditions
166
150
133
100
Unit
Min
Max
Min
Max
Min
Max
Min
Max
Input leakage
current
*
* LBO pin has an internal pull-up and input leakage = 10
a.
Note: ICC give with no output loading. ICC increases with faster cycle times and greater output loading.
|I
LI
|
V
DD
= Max, V
IN
= GND to V
DD
2
2
2
2
A
Output leakage
current
|I
LO
|
OE
V
IH
, V
DD
= Max,
V
OUT
= GND to V
DD
2
2
2
2
A
Operating power
supply current
I
CC
CE0 = V
IL
, CE1 = V
IH
, CE2 = V
IL
,
f = f
Max
, I
OUT
= 0 mA
475
450
425
325
mA
Standby power
supply current
I
SB
Deselected, f = f
Max
, ZZ
V
IL
130
110
100
90
mA
I
SB1
Deselected, f = 0, ZZ
0.2V
all V
IN
0.2V or
V
DD
0.2V
30
30
30
30
I
SB2
Deselected, f = f
Max
, ZZ
V
DD
0.2V
All V
IN
V
IL
or
V
IH
30
30
30
30
Output voltage
V
OL
I
OL
= 8 mA, V
DDQ
= 3.465V
0.4
0.4
0.4
0.4
V
V
OH
I
OH
= 4 mA, V
DDQ
= 3.135V
2.4
2.4
2.4
2.4
Parameter
Symbol
Test conditions
166
150
133
100
Unit
Min
Max
Min
Max
Min
Max
Min
Max
Output leakage
current
|I
LO
|
OE
V
IH
, V
DD
= Max,
V
OUT
= GND to V
DD
1
1
1
1
1
1
1
1
A
Output voltage
V
OL
I
OL
= 2 mA, V
DDQ
= 2.65V
0.7
0.7
0.7
0.7
V
V
OH
I
OH
= 2 mA, V
DDQ
= 2.35V
1.7
1.7
1.7
1.7
Parameter
Symbol
166
150
133
100
Unit
Notes*
Min
Max
Min
Max
Min
Max
Min
Max
Clock frequency
f
Max
166
150
133
100
MHz
Cycle time (pipelined mode)
t
CYC
6
6.6
7.5
10
ns
Cycle time (flow-through mode)
t
CYCF
10
10
12
12
ns
Clock access time (pipelined mode)
t
CD
3.5
3.8
4.0
5.0
ns
AS7C33256PFS16A
AS7C33256PFS18A
3/14/01; V.1.0
Alliance Semiconductor
P. 6 of 11
*"Notes" column refers to "notes" on page 10.
Key to switching waveforms
Clock access time (flow-through
mode)
t
CDF
9
10
10
12
ns
Output enable LOW to data valid
t
OE
3.5
3.8
4.0
5.0
ns
Clock HIGH to output Low Z
t
LZC
0
0
0
0
ns
2,3,4
Data output invalid from clock HIGH
t
OH
1.5
1.5
1.5
1.5
ns
2
Output enable LOW to output Low Z
t
LZOE
0
0
0
0
ns
2,3,4
Output enable HIGH to output High Z
t
HZOE
3.5
3.8
4.0
4.5
ns
2,3,4
Clock HIGH to output High Z
t
HZC
3.5
3.8
4.0
5.0
ns
2,3,4
Output enable HIGH to invalid output
t
OHOE
0
0
0
0
ns
Clock HIGH pulse width
t
CH
2.4
2.5
2.5
3.5
ns
5
Clock LOW pulse width
t
CL
2.4
2.5
2.5
3.5
ns
5
Address setup to clock HIGH
t
AS
1.5
1.5
1.5
2.0
ns
6
Data setup to clock HIGH
t
DS
1.5
1.5
1.5
2.0
ns
6
Write setup to clock HIGH
t
WS
1.5
1.5
1.5
2.0
ns
6,7
Chip select setup to clock HIGH
t
CSS
1.5
1.5
1.5
2.0
ns
6,8
Address hold from clock HIGH
t
AH
0.5
0.5
0.5
0.5
ns
6
Data hold from clock HIGH
t
DH
0.5
0.5
0.5
0.5
ns
6
Write hold from clock HIGH
t
WH
0.5
0.5
0.5
0.5
ns
6,7
Chip select hold from clock HIGH
t
CSH
0.5
0.5
0.5
0.5
ns
6,8
ADV setup to clock HIGH
t
ADVS
1.5
1.5
1.5
2.0
ns
6
ADSP setup to clock HIGH
t
ADSPS
1.5
1.5
1.5
2.0
ns
6
ADSC setup to clock HIGH
t
ADSCS
1.5
1.5
1.5
2.0
ns
6
ADV hold from clock HIGH
t
ADVH
0.5
0.5
0.5
0.5
ns
6
ADSP hold fromclock HIGH
t
ADSPH
0.5
0.5
0.5
0.5
ns
6
ADSC hold from clock HIGH
t
ADSCH
0.5
0.5
0.5
0.5
ns
6
Parameter
Symbol
166
150
133
100
Unit
Notes*
Min
Max
Min
Max
Min
Max
Min
Max
Undefined/don't care
Falling input
Rising input
AS7C33256PFS16A
AS7C33256PFS18A
3/14/01; V.1.0
Alliance Semiconductor
P. 7 of 11
Timing waveform of read cycle
Note: = XOR when MODE = HIGH/No Connect; = ADD when MODE = LOW.
BW[a:b] is don't care.
t
CYC
t
CH
t
CL
t
ADSPS
t
ADSPH
t
AS
t
AH
t
WS
t
ADVS
t
OH
CLK
ADSP
ADSC
Address
GWE, BWE
CE0, CE2
ADV
OE
D
OUT
t
CSS
t
CSH
t
HZC
t
CD
t
WH
t
ADVH
t
HZOE
t
ADSCS
t
ADSCH
LOAD NEW ADDRESS
ADV INSERTS WAIT STATES
Q(A210)
Q(A211)
Q(A3)
Q(A2)
Q(A201)
Q(A301)
Q(A310)
Q(A1)
A2
A1
A3
CE1
(pipelined mode)
D
OUT
Q(A210)
Q(A211)
Q(A3)
Q(A201)
Q(A301)
Q(A310)
Q(A311)
Q(A1)
(flow-through mode)
t
HZC
t
OE
t
LZOE
AS7C33256PFS16A
AS7C33256PFS18A
3/14/01; V.1.0
Alliance Semiconductor
P. 8 of 11
Timing waveform of write cycle
Note: = XOR when MODE = HIGH/No Connect; = ADD when MODE = LOW.
t
CYC
t
CL
t
ADSPS
t
ADSPH
t
ADSCS
t
ADSCH
t
AS
t
AH
t
WS
t
WH
t
CSS
t
ADVS
t
DS
t
DH
CLK
ADSP
ADSC
Address
BWE
CE0, CE2
ADV
OE
Data In
t
CSH
t
ADVH
D(A201)
D(A210)
D(A3)
D(A2)
D(A201)
D(A301)
D(A310)
D(A1)
D(A211)
ADV SUSPENDS BURST
ADSC LOADS NEW ADDRESS
A1
A2
A3
t
CH
CE1
BWa,b
AS7C33256PFS16A
AS7C33256PFS18A
3/14/01; V.1.0
Alliance Semiconductor
P. 9 of 11
Timing waveform of read/write cycle
Note: = XOR when MODE = HIGH/No Connect; = ADD when MODE = LOW.
t
CH
t
CYC
t
CL
t
ADSPS
t
ADSPH
t
AS
t
AH
t
WS
t
WH
t
ADVS
t
DS
t
DH
t
OH
CLK
ADSP
Address
GWE
CE0, CE2
ADV
OE
D
IN
D
OUT
t
LZC
t
ADVH
t
LZOE
t
OE
t
CD
Q(A1)
Q(A301)
D(A2)
Q(A3)
Q(A310)
Q(A311)
A1
A2
A3
CE1
t
HZOE
(pipeline mode)
D
OUT
Q(A1)
Q(A301)
Q(A310)
(flow-through mode)
t
CDF
Q(A311)
AS7C33256PFS16A
AS7C33256PFS18A
3/14/01; V.1.0
Alliance Semiconductor
P. 10 of 11
Package Dimensions
100-pin quad flat pack (TQFP)
Dimensions in millimeters
TQFP
Min
Max
A1
0.05
0.15
A2
1.35
1.45
b
0.22
0.38
c
0.09
0.20
D
13.90
14.10
E
19.90
20.10
e
0.65 nominal
Hd
15.90
16.10
He
21.90
22.10
L
0.45
0.75
L1
1.00 nominal
0
7
A1 A2
L1
L
c
He
E
Hd
D
b
e
Notes
1) For test conditions, see AC Test Conditions, Figures A, B, C.
2) This parameter measured with output load condition in Figure C.
3) This parameter is sampled, but not 100% tested.
4) t
HZOE
is less than t
LZOE
; and t
HZC
is less than t
LZC
at any given temperature and voltage.
5) tCH measured as HIGH above VIH and tCL measured as LOW below VIL.
6) This is a synchronous device. All addresses must meet the specified setup and hold times for all rising edges of CLK. All other synchronous inputs must
meet the setup and hold times with stable logic levels for all rising edges of CLK when chip is enabled.
7) Write refers to
GWE
,
BWE
,
BW[a:d].
8) Chip select refers to
CE0
,
CE1
,
CE2
.
AC test conditions
351
5 pF*
317
D
OUT
GND
Figure C: Output load(B)
*including scope
and jig capacitance
Z
0
= 50
D
OUT
50
Figure B: Output load (A)
30 pF*
Figure A: Input waveform
10%
90%
GND
90%
10%
+3.0V
Output load: see Figure B, except for t
LZC
, t
LZOE
, t
HZOE
, t
HZC
, see Figure C.
Input pulse level: GND to 3V. See Figure A.
Input rise and fall time (measured at 0.3V and 2.7V): 2 ns. See Figure A.
Input and output timing reference levels: 1.5V.
V
L
= 1.5V
for 3.3V I/O;
= V
DDQ
/2
for 2.5V I/O
Thevenin equivalent:
+3.3V for 3.3V I/O;
+2.5V for 2.5V I/O
AS7C33256PFS16A
AS7C33256PFS18A
Copyright Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or registered trademarks of Alliance. All other brand and
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change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these specifications are possible. The information in this
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against all claims arising from such use.
3/14/01; V.1.0
Alliance Semiconductor
P. 11 of 11
Ordering information
Part numbering guide
1.Alliance Semiconductor SRAM prefix
2.Operating voltage: 33=3.3V
3.Organization: 256=256K
4.Pipeline-Flowthrough (each device works in both modes)
5.Deselect: S=Single cycle deselect
6.Organization: 16=x16; 18=x18
7.Production version: A=first production version
8.Clock speed (MHz)
9.Package type: TQ=TQFP
10.Operating temperature: C=Commercial (
0
C to 70
C); I=Industrial (-40
C to 85
C)
166 MHz
150 MHz
133 MHz
100 MHz
AS7C33256PFS16A-166TQC
AS7C33256PFS16A-150TQC
AS7C33256PFS16A-133TQC AS7C33256PFS16A-100TQC
AS7C33256PFS16A-166TQI
AS7C33256PFS16A-150TQI
AS7C33256PFS16A-133TQI
AS7C33256PFS16A-100TQI
AS7C33256PFS18A-166TQC
AS7C33256PFS18A-150TQC
AS7C33256PFS18A-133TQC AS7C33256PFS18A-100TQC
AS7C33256PFS18A-166TQI
AS7C33256PFS18A-150TQI
AS7C33256PFS18A-133TQI
AS7C33256PFS18A-100TQI
AS7C
33
256
PF
S
16/18
A
XXX
TQ
C/I
1
2
3
4
5
6
7
8
9
10
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