ETC AS7C33256PFS18A

AS7C33256PFS16A
AS7C33256PFS18A
January 2002
®
3.3V 256K × 16/18 pipeline burst synchronous SRAM
Features
• Organization: 262,144 words × 16 or 18 bits
• Fast clock speeds to 200 MHz in LVTTL/LVCMOS
• Fast clock to data access: 3.0/3.1/3.5/4.0/5.0 ns
• Fast OE access time: 3.0/3.1/3.5/4.0/5.0 ns
• Fully synchronous register-to-register operation
• “Flow-through” mode
• Single-cycle deselect
- Dual-cycle deselect also available (AS7C33256PFD16A/
AS7C33256PFD18A)
• Pentium®1 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 VDDQ
• 30 mW typical standby power in power down mode
• NTD™1pipeline architecture available
(AS7C33256NTD16A/AS7C33256NTD18A)
1. Pentium® is a registered trademark of Intel Corporation. NTD™ is a
trademark of Alliance Semiconductor Corporation. All trademarks mentioned in this document are the property of their respective owners.
Logic block diagram
Pin arrangement
Q
D
18
16 18
Address
register
CS
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
256K × 16/18
Memory
array
NC
NC
NC
VDDQ
VSSQ
NC
NC
DQb
DQb
VSSQ
VDDQ
DQb
DQb
FT
VDD
NC
VSS
DQb
DQb
VDDQ
VSSQ
DQb
DQb
DQpb/NC
NC
VSSQ
VDDQ
NC
NC
NC
CLK
16/18 16/18
GWE
BWb
D
DQb
Q
Byte Write
registers
BWE
CLK
D DQa
Q
BWa
Byte Write
registers
CE0
CE1
CE2
D
2
CLK
Enable Q
register
CE
CLK
D
ZZ
Power
down
OE
Output
registers
CLK
Input
registers
CLK
Enable Q
delay
register
CLK
OE
FT
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
DATA [17:0]
DATA [15:0]
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
TQFP 14 × 20mm
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
18
A[17:0]
Burst logic
A17
NC
NC
VDDQ
VSSQ
NC
DQpa/NC
DQa
DQa
VSSQ
VDDQ
DQa
DQa
VSS
NC
VDD
ZZ
DQa
DQa
VDDQ
VSSQ
DQa
DQa
NC
NC
VSSQ
VDDQ
NC
NC
NC
LBO
A5
A4
A3
A2
A1
A0
NC
NC
VSS
VDD
NC
NC
A10
A11
A12
A13
A14
A15
A16
CLK
CS
CLR
CLK
ADV
ADSC
ADSP
A6
A7
CE0
CE1
NC
NC
BWb
BWa
CE2
VDD
VSS
CLK
GWE
BWE
OE
ADSC
ADSP
ADV
A8
A9
LBO
Note: pins 24, 74 are NC for ×16.
Selection guide
–200
–183
–166
–133
–100
Units
5
5.4
6
7.5
10
ns
Maximum pipelined clock frequency
200
183
166
133
100
MHz
Maximum pipelined clock access time
3
3.1
3.5
4
5
ns
Maximum operating current
570
540
475
425
325
mA
Maximum standby current
160
140
130
100
90
mA
Maximum CMOS standby current (DC)
30
30
30
30
30
mA
Minimum cycle time
1/30/02; V.1.3
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Copyright © Alliance Semiconductor. All rights reserved.
AS7C33256PFS16A
AS7C33256PFS18A
®
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™1-based systems in computing, datacomm, instrumentation, and telecommunications systems.
Fast cycle times of 5.0/5.4/6.0/7.5/10 ns with clock access times (tCD) of 3.0/3.1/3.5/4.0/5.0 ns enable 200, 183, 166, 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 mode 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™ 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 14×20 mm TQFP packaging.
Capacitance
Parameter
Symbol
Signals
Test conditions
Max
Unit
Input capacitance
CIN
Address and control pins
VIN = 0V
5
pF
I/O capacitance
CI/O
I/O pins
VIN = VOUT = 0V
7
pF
Write enable truth table (per byte)
GWE
BWE
BWn
WEn
L
X
X
T
H
L
L
T
H
H
X
F*
H
L
H
F*
Key: *= valid read; n = a,b X = Don’t Care, L = Low, H = High, T=True, F=False; WE, WEn = internal write signal
PowerPC™ is a tradenark International Business Machines Corporation.
1/30/02; V.1.3
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P. 2 of 12
AS7C33256PFS16A
AS7C33256PFS18A
®
Signal descriptions
Signal
I/O
Properties
Description
CLK
I
CLOCK
A0–A17
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
FT
I
STATIC
Flow-through mode.When LOW, enables single register flow-through mode.
Connect to VDD if unused or for pipelined operation.
ZZ
I
ASYNC
Sleep. Places device in low power mode; data is retained. Connect to GND if unused.
Clock. All inputs except OE, FT, ZZ, LBO are synchronous to this clock.
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.
Absolute maximum ratings
Parameter
Symbol
Min
Max
Unit
VDD, VDDQ
–0.5
+4.6
V
Input voltage relative to GND (input pins)
VIN
–0.5
VDD + 0.5
V
Input voltage relative to GND (I/O pins)
VIN
–0.5
VDDQ + 0.5
V
Power dissipation
PD
–
1.8
W
DC output current
IOUT
–
50
mA
Storage temperature (plastic)
Tstg
–65
+150
°C
Temperature under bias
Tbias
–65
+135
°C
Power supply voltage relative to GND
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.
1/30/02; V.1.3
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AS7C33256PFS16A
AS7C33256PFS18A
®
Synchronous truth table
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−Z2
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−Z2
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
D3
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
Key: X = Don’t Care, L = Low, H = High.
1See “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
1/30/02; V.1.3
Symbol
Min
Nominal
Max
VDD
3.135
3.3
3.6
VSS
0.0
0.0
0.0
VDDQ
3.135
3.3
3.6
VSSQ
0.0
0.0
0.0
VDDQ
2.35
2.5
2.9
VSSQ
0.0
0.0
0.0
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AS7C33256PFS16A
AS7C33256PFS18A
®
Recommended operating conditions
Parameter
1
Input voltages
Ambient operating
temperature
Symbol
Min
Nominal
Max
Unit
VIH
2.0
–
VDD + 0.3
VIL
–0.52
–
0.8
VIH
2.0
–
VDDQ + 0.3
VIL
–0.52
–
0.8
TA
0
–
70
V
V
°C
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9,/PLQ ±9IRUSXOVHZLGWKOHVVWKDQîW5&
TQFP thermal resistance
Description
Thermal resistance
(junction to ambient)1
Thermal resistance
(junction to top of case)1
Conditions
Symbol
Typical
Units
θJA
46
°C/W
θJC
2.8
°C/W
Test conditions follow standard test methods and
procedures for measuring thermal impedance,
per EIA/JESD51
1 This parameter is sampled.
DC electrical characteristics
–200
Parameter
–183
–166
–133
–100
Symbol
Test conditions
Input leakage
current1
|ILI|
VDD = Max, VIN = GND to
VDD
–
2
–
2
–
2
–
2
–
2
µA
Output leakage
current
|ILO|
OE ≥ VIH, VDD = Max,
VOUT = GND to VDD
–
2
–
2
–
2
–
2
–
2
µA
ICC2
CE0 = VIL, CE1 = VIH, CE2 =
VIL,
f = fMax, IOUT = 0 mA
–
570
–
540
–
475
–
425
–
325 mA
ISB
Deselected, f = fMax, ZZ ≤ VIL
–
160
–
140
–
130
–
100
–
90
ISB1
Deselected, f = 0, ZZ ≤ 0.2V
all VIN ≤ 0.2V or ≥ VDD –
0.2V
–
30
–
30
–
30
–
30
–
30
ISB2
Deselected, f = fMax, ZZ ≥ VDD –
0.2V
All VIN ≤ VIL or ≥ VIH
–
30
–
30
–
30
–
30
–
30
VOL
IOL = 8 mA, VDDQ = 3.465V
–
0.4
–
0.4
–
0.4
–
0.4
–
0.4
VOH
IOH = –4 mA, VDDQ =
3.135V
2.4
–
2.4
–
2.4
–
2.4
–
2.4
–
Operating power
supply current
Standby power
supply current
Output voltage
Min Max Min Max Min Max Min Max Min Max Unit
mA
1 LBO pin has an internal pull-up and input leakage = ±10 µa.
2 ICC give with no output loading. ICC increases with faster cycle times and greater output loading.
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V
AS7C33256PFS16A
AS7C33256PFS18A
®
DC electrical characteristics for 2.5V I/O operation
–200
–183
–166
–133
–100
Parameter
Symbol
Test conditions
Output leakage
current
|ILO|
OE ≥ VIH, VDD = Max,
VOUT = GND to VDD
–1
1
–1
1
–1
1
–1
1
–1
1
VOL
IOL = 2 mA, VDDQ = 2.65V
–
0.7
–
0.7
–
0.7
–
0.7
–
0.7
–
1.7
–
1.7
–
1.7
–
1.7
–
Output voltage
1/30/02; V.1.3
VOH
Min Max Min Max Min Max Min Max Min Max Unit
IOH = –2 mA, VDDQ = 2.35V 1.7
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AS7C33256PFS16A
AS7C33256PFS18A
®
Timing characteristics over operating range
–200
Parameter
–183
–166
–133
–100
Symbol Min Max Min Max Min Max Min Max Min Max Unit Notes1
Clock frequency
fMax
–
200
–
183
–
166
–
133
–
100 MHz
Cycle time (pipelined mode)
tCYC
5
–
5.4
–
6
–
7.5
–
10
–
ns
Cycle time (flow-through mode)
tCYCF
9
–
10
–
10
–
12
–
12
–
ns
Clock access time (pipelined mode)
tCD
–
3.0
–
3.1
–
3.5
–
4.0
–
5.0
ns
Clock access time (flow-through
mode)
tCDF
–
8.5
–
9
–
9
–
10
–
12
ns
Output enable LOW to data valid
tOE
–
3.0
–
3.1
–
3.5
–
4.0
–
5.0
ns
Clock HIGH to output Low Z
tLZC
0
–
0
–
0
–
0
–
0
–
ns
2,3,4
Data output invalid from clock
HIGH
tOH
1.5
–
1.5
–
1.5
–
1.5
–
1.5
–
ns
2
Output enable LOW to output Low Z
tLZOE
0
–
0
–
0
–
0
–
0
–
ns
2,3,4
Output enable HIGH to output
High Z
tHZOE
–
3.0
–
3.1
–
3.5
–
4.0
–
4.5
ns
2,3,4
Clock HIGH to output High Z
tHZC
–
3.0
–
3.1
–
3.5
–
4.0
–
5.0
ns
2,3,4
Output enable HIGH to invalid
output
tOHOE
0
–
0
–
0
–
0
–
0
–
ns
Clock HIGH pulse width
tCH
2.2
–
2.4
–
2.4
–
2.5
–
3.5
–
ns
5
Clock LOW pulse width
tCL
2.2
–
2.4
–
2.4
–
2.5
–
3.5
–
ns
5
Address setup to clock HIGH
tAS
1.4
–
1.4
–
1.5
–
1.5
–
2.0
–
ns
6
Data setup to clock HIGH
tDS
1.4
–
1.4
–
1.5
–
1.5
–
2.0
–
ns
6
Write setup to clock HIGH
tWS
1.4
–
1.4
–
1.5
–
1.5
–
2.0
–
ns
6,7
Chip select setup to clock HIGH
tCSS
1.4
–
1.4
–
1.5
–
1.5
–
2.0
–
ns
6,8
Address hold from clock HIGH
tAH
0.5
–
0.5
–
0.5
–
0.5
–
0.5
–
ns
6
Data hold from clock HIGH
tDH
0.5
–
0.5
–
0.5
–
0.5
–
0.5
–
ns
6
Write hold from clock HIGH
tWH
0.5
–
0.5
–
0.5
–
0.5
–
0.5
–
ns
6,7
Chip select hold from clock HIGH
tCSH
0.5
–
0.5
–
0.5
–
0.5
–
0.5
–
ns
6,8
ADV setup to clock HIGH
tADVS
1.4
–
1.4
–
1.5
–
1.5
–
2.0
–
ns
6
ADSP setup to clock HIGH
tADSPS
1.4
–
1.4
–
1.5
–
1.5
–
2.0
–
ns
6
ADSC setup to clock HIGH
tADSCS
1.4
–
1.4
–
1.5
–
1.5
–
2.0
–
ns
6
ADV hold from clock HIGH
tADVH
0.5
–
0.5
–
0.5
–
0.5
–
0.5
–
ns
6
ADSP hold fromclock HIGH
tADSPH
0.5
–
0.5
–
0.5
–
0.5
–
0.5
–
ns
6
ADSC hold from clock HIGH
tADSCH
0.5
–
0.5
–
0.5
–
0.5
–
0.5
–
ns
6
1 See “Notes” on page 11..
1/30/02; V.1.3
Alliance Semiconductor
P. 7 of 12
AS7C33256PFS16A
AS7C33256PFS18A
®
Key to switching waveforms
Rising input
Falling input
Undefined/don’t care
Timing waveform of read cycle
tCH
tCYC
tCL
CLK
tADSPS
tADSPH
ADSP
tADSCS
tADSCH
ADSC
tAS
LOAD NEW ADDRESS
tAH
Address
A1
A2
A3
tWS
tWH
GWE, BWE
tCSS
tCSH
CE0, CE2
CE1
tADVS
tADVH
ADV
OE
tCD
tHZOE
tOH
ADV INSERTS WAIT STATES
tHZC
DOUT
(pipelined mode) t
OE
tLZOE
DOUT
(flow-through mode)
Q(A1)
Q(A1)
Q(A2)
Q(A2Ý01)
Q(A2Ý01)
Q(A2Ý10)
Q(A2Ý10)
Q(A2Ý11)
Q(A2Ý11)
Q(A3)
Q(A3)
Q(A3Ý01)
Q(A3Ý01)
Q(A3Ý10)
Q(A3Ý10)
Q(A3Ý11)
tHZC
Note: Ý = XOR when LBO = HIGH/No Connect; Ý = ADD when LBO = LOW.
BW[a:b] is don’t care.
1/30/02; V.1.3
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AS7C33256PFS16A
AS7C33256PFS18A
®
Timing waveform of write cycle
tCYC
tCH
tCL
CLK
tADSPS
tADSPH
ADSP
tADSCS
tADSCH
ADSC
ADSC LOADS NEW ADDRESS
tAS
tAH
Address
A1
A3
A2
tWS
tWH
BWE
BWa,b
tCSS
tCSH
CE0, CE2
CE1
tADVS
ADV SUSPENDS BURST
tADVH
ADV
OE
tDS
tDH
Data In
D(A1)
D(A2)
D(A2Ý01)
D(A2Ý01)
D(A2Ý10)
D(A2Ý11)
D(A3)
D(A3Ý01)
D(A3Ý10)
Note: Ý = XOR when LBO = HIGH/No Connect; Ý = ADD when LBO = LOW.
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Alliance Semiconductor
P. 9 of 12
AS7C33256PFS16A
AS7C33256PFS18A
®
Timing waveform of read/write cycle
tCYC
tCH
tCL
CLK
tADSPS
tADSPH
ADSP
tAS
tAH
Address
A2
A1
A3
tWS
tWH
GWE
CE0, CE2
CE1
tADVS
tADVH
ADV
OE
tDS
tDH
D(A2)
DIN
tHZOE
tLZC
tCD
tOE
Q(A1)
DOUT
(pipeline mode)
tOH
tLZOE
Q(A3)
Q(A3Ý01)
Q(A3Ý10)
Q(A3Ý11)
tCDF
DOUT
(flow-through mode)
Q(A1)
Q(A3Ý01)
Q(A3Ý10)
Q(A3Ý11)
Note: Ý = XOR when LBO = HIGH/No Connect; Ý = ADD when LBO = LOW.
1/30/02; V.1.3
Alliance Semiconductor
P. 10 of 12
AS7C33256PFS16A
AS7C33256PFS18A
®
AC test conditions
• Output load: see Figure B, except for tLZC, tLZOE, tHZOE, tHZC, see Figure C.
• Input pulse level: GND to 3V. See Figure A.
Thevenin equivalent:
• Input rise and fall time (measured at 0.3V and 2.7V): 2 ns. See Figure A.
+3.3V for 3.3V I/O;
/+2.5V for 2.5V I/O
• Input and output timing reference levels: 1.5V.
+3.0V
90%
90%
10%
10%
GND
DOUT
Figure A: Input waveform
Z0 = 50Ω
50Ω
VL = 1.5V
for 3.3V I/O;
30 pF* = V
DDQ/2
for 2.5V I/O
Figure B: Output load (A)
319Ω / 1667Ω
DOUT
353Ω / 1538Ω
5 pF*
GND *including scope
and jig capacitance
Figure C: Output load (B)
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 tHZOE is less than tLZOE; and tHZC is less than tLZC 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 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
Package Dimensions
100-pin quad flat pack (TQFP)
Hd
TQFP
Min
Max
0.05
0.15
1.35
1.45
0.22
0.38
0.09
0.20
13.90 14.10
19.90 20.10
0.65 nominal
15.90 16.10
21.90 22.10
0.45
0.75
1.00 nominal
0°
7°
A1
A2
b
c
D
E
e
Hd
He
L
L1
α
D
b
e
He E
Dimensions in millimeters
c
L1
L
1/30/02; V.1.3
A1 A2
Alliance Semiconductor
α
P. 11 of 12
AS7C33256PFS16A
AS7C33256PFS18A
®
Ordering information
Package
Width
–200 MHz
–183 MHz
–166 MHz
–133 MHz
–100 MHz
TQFP
x16
AS7C33256PFS16A- AS7C33256PFS16A AS7C33256PFS16 AS7C33256PFS16A AS7C33256PFS16A
200TQC
-183TQC
A-166TQC
-133TQC
-100TQC
TQFP
x16
AS7C33256PFS16A- AS7C33256PFS16A AS7C33256PFS16 AS7C33256PFS16A AS7C33256PFS16A
200TQI
-183TQI
A-166TQI
-133TQI
-100TQI
TQFP
x18
AS7C33256PFS18A- AS7C33256PFS18A AS7C33256PFS18 AS7C33256PFS18A AS7C33256PFS18A
200TQC
-183TQC
A-166TQC
-133TQC
-100TQC
TQFP
x18
AS7C33256PFS18A- AS7C33256PFS18A AS7C33256PFS18 AS7C33256PFS18A AS7C33256PFS18A
200TQI
-183TQI
A-166TQI
-133TQI
-100TQI
Part numbering guide
AS7C
33
256
PF
S
16/18
A
–XXX
TQ
C/I
1
2
3
4
5
6
7
8
9
10
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)
1/30/02; V.1.3
Alliance Semiconductor
P. 12 of 12
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