ALSC AS7C33256PFD32A 3.3v 256k x 32/36 pipelined burst synchronous sram Datasheet

December 2004
AS7C33256PFD32A
AS7C33256PFD36A
®
3.3V 256K × 32/36 pipelined burst synchronous SRAM
Features
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Organization: 262,144 words x 32 or 36 bits
Fast clock speeds to 166 MHz
Fast clock to data access: 3.5/4.0 ns
Fast OE access time: 3.5/4.0 ns
Fully synchronous register-to-register operation
Dual-cycle deselect
Asynchronous output enable control
Available in100-pin TQFP
Individual byte write and global write
Multiple chip enables for easy expansion
Linear or interleaved burst control
Snooze mode for reduced power-standby
Common data inputs and data outputs
3.3V core power supply
2.5V or 3.3V I/O operation with separate VDDQ
Logic block diagram
LBO
CLK
ADV
CLK
CE
CLR
ADSC
ADSP
18
A[17:0]
BWE
Q0
Burst logic
Q1
18 2 16
D
Q
CE Address
register
CLK
BWd
DQd Q
Byte write
registers
CLK
BWc
D DQ Q
c
Byte write
registers
CLK
36/32
D DQb Q
Byte write
registers
CLK
BWb
BWa
D DQ Q
a
Byte write
registers
CLK
CE0
CE1
CE2
D
ZZ
36/32
D
GWE
256K × 32/36
Memory
array
2 18
4
OE
Output
registers
CLK
Q
Enable
CE register
CLK
Power
down
Input
registers
CLK
D Enable Q
delay
register
CLK
36/32
DQ[a:d]
OE
Selection guide
Minimum cycle time
Maximum clock frequency
–166
–133
Units
6
7.5
ns
166
133
MHz
Maximum clock access time
3.5
4
ns
Maximum operating current
475
425
mA
Maximum standby current
130
100
mA
Maximum CMOS standby current (DC)
30
30
mA
12/1/04, v.1.2
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Copyright ©Alliance Semiconductor. All rights reserved.
AS7C33256PFD32A
AS7C33256PFD36A
®
8 Mb Synchronous SRAM products list1,2
Org
512KX18
256KX32
Part Number
AS7C33512PFS18A
AS7C33256PFS32A
Mode
PL-SCD
PL-SCD
Speed
166/133 MHz
166/133 MHz
256KX36
512KX18
256KX32
256KX36
512KX18
256KX32
256KX36
512KX18
256KX32
256KX36
AS7C33256PFS36A
AS7C33512PFD18A
AS7C33256PFD32A
AS7C33256PFD36A
AS7C33512FT18A
AS7C33256FT32A
AS7C33256FT36A
AS7C33512NTD18A
AS7C33256NTD32A
AS7C33256NTD36A
PL-SCD
PL-DCD
PL-DCD
PL-DCD
FT
FT
FT
NTD-PL
NTD-PL
166/133 MHz
166/133 MHz
166/133 MHz
166/133 MHz
7.5/8.5/10 ns
7.5/8.5/10 ns
7.5/8.5/10 ns
166/133 MHz
166/133 MHz
512KX18
256KX32
256KX36
AS7C33512NTF18A
AS7C33256NTF32A
AS7C33256NTF36A
NTD-PL
NTD-FT
NTD-FT
NTD-FT
166/133 MHz
7.5/8.5/10 ns
7.5/8.5/10 ns
7.5/8.5/10 ns
1 Core Power Supply: VDD = 3.3V + 0.165V
2 I/O Supply Voltage: VDDQ = 3.3V + 0.165V for 3.3V I/O
VDDQ = 2.5V + 0.125V for 2.5V I/O
PL-SCD
PL-DCD
FT
NTD1-PL
NTD-FT
:
:
:
:
:
Pipelined Burst Synchronous SRAM - Single Cycle Deselect
Pipelined Burst Synchronous SRAM - Double Cycle Deselect
Flow-through Burst Synchronous SRAM
Pipelined Burst Synchronous SRAM with NTDTM
Flow-through Burst Synchronous SRAM with NTDTM
1NTD: No Turnaround Delay. NTDTM is a trademark of Alliance Semiconductor Corporation. All trademarks mentioned in this document are the property of
their respective owners.
12/1/04, v.1.2
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AS7C33256PFD32A
AS7C33256PFD36A
®
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
TQFP 14 × 20 mm
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
DQPb/NC
DQb7
DQb6
VDDQ
VSSQ
DQb5
DQb4
DQb3
DQb2
VSSQ
VDDQ
DQb1
DQb0
VSS
NC
VDD
ZZ
DQa7
DQa6
VDDQ
VSSQ
DQa5
DQa4
DQa3
DQa2
VSSQ
VDDQ
DQa1
DQa0
DQPa/NC
LBO
A
A
A
A
A1
A0
NC
NC
VSS
VDD
NC
A
A
A
A
A
A
A
A
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
DQPc/NC
DQc0
DQc1
VDDQ
VSSQ
DQc2
DQc3
DQc4
DQc5
VSSQ
VDDQ
DQc6
DQc7
NC
VDD
NC
VSS
DQd0
DQd1
VDDQ
VSSQ
DQd2
DQd3
DQd4
DQd5
VSSQ
VDDQ
DQd6
DQd7
DQPd/NC
100
99
98
97
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
A
A
CE0
CE1
BWd
BWc
BWb
BWa
CE2
VDD
VSS
CLK
GWE
BWE
OE
ADSC
ADSP
ADV
A
A
Pin arrangement TQFP
Note: Pins 1, 30, 51, 80 are NC for ×32
12/1/04, v.1.2
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AS7C33256PFD32A
AS7C33256PFD36A
®
Functional description
The AS7C33256PFD32A and AS7C33256PFD36A are high-performance CMOS 8-Mbit Synchronous Static Random Access
Memory (SRAM) devices organized as 262,144 words x 32 or 36 bits, and incorporate a two-stage register-register pipeline
for highest frequency on any given technology.
Fast cycle times of 6/7.5 ns with clock access times (tCD) of 3.5/4.0 ns enable 166 and 133 MHz bus frequencies. Two-chip
enable and three-chip enable (CE) inputs permit versatility and 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 an interleaved count sequence. With LBO driven LOW, the
device uses a linear count sequence.
Write cycles are performed by disabling the output buffers with OE and asserting a write command. A global write enable
GWE writes all 32/36 bits regardless of the state of individual BW[a:d] 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. This device operates in
double cycle deselect features during real cycle.
Read or write cycles may also be initiated with ADSC instead of ADSP. The differences between cycles initiated with ADSC
and ADSP are as follows:
• 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 enable CE0 blocks ADSP, but not ADSC.
AS7C33256PFD32A and AS7C33256PFD36A family operates from a core 3.3V power 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 package.
TQFP thermal Capacitance
Parameter
Input capacitance
I/O capacitance
Symbol
CIN*
CI/O*
*
Guaranteed not tested
Test conditions
VIN = 0V
VIN = VOUT = 0V
Min
-
Max
5
7
Unit
pF
pF
Units
°C/W
°C/W
°C/W
TQFP thermal resistance
Description
Thermal resistance
(junction to ambient)1
Thermal resistance
(junction to top of case)1
Conditions
Test conditions follow standard test methods
and procedures for measuring thermal
impedance, per EIA/JESD51
1–layer
Symbol
θJA
4–layer
θJA
Typical
40
22
θJC
8
1 This parameter is sampled
12/1/04, v.1.2
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AS7C33256PFD32A
AS7C33256PFD36A
®
Signal descriptions
Signal
I/O
Properties
Description
CLK
I
CLOCK
A, A0, A1
I
SYNC
Address. Sampled when all chip enables are active and ADSC or ADSP are asserted.
DQ[a,b,c,d] 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 bus 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
Advance. Asserted LOW to continue burst read/write.
GWE
I
SYNC
Global write enable. Asserted LOW to write all 32/36 bits. When HIGH, BWE and
BW[a:d] control write enable.
BWE
I
SYNC
Byte write enable. Asserted LOW with GWE = HIGH to enable effect of BW[a:d]
inputs.
BW[a,b,c,d] I
SYNC
Write enables. Used to control write of individual bytes when GWE = HIGH and BWE =
LOW. If any of BW[a:d] is active with GWE = HIGH and BWE = LOW the cycle is a
write cycle. If all BW[a:d] are inactive the cycle is a read cycle.
Clock. All inputs except OE, ZZ, LBO are synchronous to this clock.
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
Selects Burst mode. When tied to VDD or left floating, device follows Interleaved Burst
order. When driven Low, device follows linear Burst order. This signal is internally
pulled High.
ZZ
I
ASYNC
Snooze. Places device in LOW power mode; data is retained. Connect to GND if unused.
NC
-
-
No connect
Snooze Mode
SNOOZE MODE is a low current, power-down mode in which the device is deselected and current is reduced to ISB2. The duration of
SNOOZE MODE is dictated by the length of time the ZZ is in a High state.
The ZZ pin is an asynchronous, active high input that causes the device to enter SNOOZE MODE.
When the ZZ pin becomes a logic High, ISB2 is guaranteed after the time tZZI is met. After entering SNOOZE MODE, all inputs except ZZ
is disabled and all outputs go to High-Z. Any operation pending when entering SNOOZE MODE is not guaranteed to successfully complete.
Therefore, SNOOZE MODE (READ or WRITE) must not be initiated until valid pending operations are completed. Similarly, when exiting
SNOOZE MODE during tPUS, only a DESELECT or READ cycle should be given while the SRAM is transitioning out of SNOOZE
MODE.
12/1/04, v.1.2
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AS7C33256PFD32A
AS7C33256PFD36A
®
Write enable truth table (per byte)
Function
Write All Bytes
Write Byte a
Write Byte c and d
Read
GWE
BWE
BWa
BWb
BWc
BWd
L
X
X
X
X
X
H
H
H
H
H
L
L
L
H
L
L
L
H
X
H
L
H
H
X
H
L
H
L
X
H
L
H
L
X
H
Key: X = don’t care, L = low, H = high, n = a, b, c, d; BWE, BWn = internal write signal.
Asynchronous Truth Table
Operation
Snooze mode
Read
Write
Deselected
ZZ
H
L
L
L
L
OE
X
L
H
X
X
I/O Status
High-Z
Dout
High-Z
Din, High-Z
High-Z
Burst order table
Interleaved Burst Order (LBO=1)
A1 A0 A1 A0 A1 A0 A1 A0
Starting Address
00
01
10
11
First increment
01
00
11
10
Second increment
10
11
00
01
Third increment
11
10
01
00
12/1/04, v.1.2
Linear Burst Order (LBO=0)
A1 A0 A1 A0 A1 A0 A1 A0
Starting Address
00
01
10
11
First increment
01
10
11
00
Second increment
10
11
00
01
Third increment
11
00
01
10
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®
Synchronous truth table[4]
CE01
CE1
CE2
ADSP
ADSC
H
L
L
L
L
L
L
L
L
X
X
X
X
H
H
H
H
L
X
H
X
H
X
L
L
X
X
H
H
H
H
X
X
X
X
X
X
X
X
H
X
X
X
X
X
X
X
H
H
L
L
L
L
X
X
X
X
X
X
X
X
L
X
X
X
X
X
L
H
L
H
L
L
H
H
H
H
H
H
X
X
X
X
H
H
X
H
X
L
X
L
X
L
X
X
L
L
H
H
H
H
H
H
H
H
L
H
H
H
H
ADV WRITE[2]
X
X
X
X
X
X
X
X
X
L
L
H
H
L
L
H
H
X
L
L
H
H
X
X
X
X
X
X
X
H
H
H
H
H
H
H
H
H
H
L
L
L
L
L
OE
Address accessed
CLK
Operation
DQ
X
X
X
X
X
L
H
L
H
L
H
L
H
L
H
L
H
X
X
X
X
X
NA
NA
NA
NA
NA
External
External
External
External
Next
Next
Current
Current
Next
Next
Current
Current
External
Next
Next
Current
Current
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
Deselect
Deselect
Deselect
Deselect
Deselect
Begin read
Begin read
Begin read
Begin read
Continue read
Continue read
Suspend read
Suspend read
Continue read
Continue read
Suspend read
Suspend read
Begin write
Continue write
Continue write
Suspend write
Suspend write
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Hi−Z
Q
Hi−Z
Q
Hi−Z
Q
Hi−Z
Q
Hi−Z
Q
Hi−Z
Q
Hi−Z
D3
D
D
D
D
1 X = don’t care, L = low, H = high
2 For WRITE, L means any one or more byte write enable signals (BWa, BWb, BWc or BWd) and BWE are LOW or GWE is LOW. WRITE = HIGH for all
BWx, BWE, GWE HIGH. See "Write enable truth table (per byte)," on page 6 for more information.
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
4 ZZ pin is always Low.
12/1/04, v.1.2
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AS7C33256PFD32A
AS7C33256PFD36A
®
Absolute maximum ratings1
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
Short circuit output current
IOUT
–
50
mA
Storage temperature (plastic)
Tstg
–65
+150
o
+135
oC
Power supply voltage relative to GND
Temperature under bias
Tbias
–65
C
Recommended operating conditions at 3.3V I/O
Parameter
Supply voltage for inputs
Supply voltage for I/O
Ground supply
Symbol
VDD
VDDQ
Vss
Min
3.135
3.135
0
Nominal
3.3
3.3
0
Max
3.465
3.465
0
Unit
V
V
V
Min
3.135
2.375
0
Nominal
3.3
2.5
0
Max
3.465
2.625
0
Unit
V
V
V
Recommended operating conditions at 2.5V I/O
Parameter
Supply voltage for inputs
Supply voltage for I/O
Ground supply
Symbol
VDD
VDDQ
Vss
1Stresses 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.
12/1/04, v.1.2
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AS7C33256PFD32A
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®
DC electrical characteristics for 3.3V I/O operation
Parameter
Input leakage current1
Output leakage current
Sym
|ILI|
|ILO|
Input high (logic 1) voltage
VIH
Input low (logic 0) voltage
VIL
Output high voltage
Output low voltage
VOH
VOL
Conditions
VDD = Max, 0V < VIN < VDD
OE ≥ VIH, VDD = Max, 0V < VOUT < VDDQ
Address and control pins
I/O pins
Address and control pins
I/O pins
IOH = –4 mA, VDDQ = 3.135V
IOL = 8 mA, VDDQ = 3.465V
Min
-2
-2
2*
2*
-0.3**
-0.5**
2.4
–
Max
2
2
VDD+0.3
VDDQ+0.3
0.8
0.8
–
0.4
Unit
µA
µA
V
V
V
V
1 LBO, and ZZ pins have an internal pull-up or pull-down, and input leakage = ±10 µA.
DC electrical characteristics for 2.5V I/O operation
Parameter
Input leakage current
Output leakage current
Sym
|ILI|
|ILO|
Input high (logic 1) voltage
VIH
Input low (logic 0) voltage
VIL
Output high voltage
Output low voltage
VOH
VOL
Conditions
VDD = Max, 0V < VIN < VDD
OE ≥ VIH, VDD = Max, 0V < VOUT < VDDQ
Address and control pins
I/O pins
Address and control pins
I/O pins
IOH = –4 mA, VDDQ = 2.375V
IOL = 8 mA, VDDQ = 2.625V
*V max < VDD +1.5V for pulse width less than 0.2
IH
**V min = -1.5 for pulse width less than 0.2 X t
IL
CYC
Min
-2
-2
1.7*
1.7*
-0.3**
-0.3**
1.7
–
Max
2
2
VDD+0.3
VDDQ+0.3
0.7
0.7
–
0.7
Unit
µA
µA
V
V
V
V
V
V
X tCYC
IDD operating conditions and maximum limits
Parameter
Operating power supply current1
Sym
ICC
ISB
Standby power supply current
ISB1
ISB2
Conditions
CE0 < VIL, CE1 > VIH, CE2 < VIL, f = fMax,
IOUT = 0 mA, ZZ < VIL
All VIN ≤ 0.2V or > VDD – 0.2V, Deselected,
f = fMax, ZZ < VIL
Deselected, f = 0, ZZ < 0.2V,
all VIN ≤ 0.2V or ≥ VDD – 0.2V
Deselected, f = fMax, ZZ ≥ VDD – 0.2V,
all VIN ≤ VIL or ≥ VIH
CE0 < VIL, CE1 > VIH, CE2 < VIL, f = fMax,
IOUT = 0 mA, ZZ < VIL
-166
-133
Unit
475
425
mA
130
100
30
30
30
30
mA
1 ICC given with no output loading. ICC increases with faster cycle times and greater output loading.
12/1/04, v.1.2
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®
Timing characteristics for 3.3 V I/O operation
–166
Parameter
–133
Notes1
Symbol
Min
Max
Min
Max
Unit
Clock frequency
fMax
–
166
–
133
MHz
Cycle time
tCYC
6
–
7.5
–
ns
Clock access time
tCD
-
3.5
-
4.0
ns
Output enable low to data valid
tOE
–
3.5
–
4.0
ns
Clock high to output low Z
tLZC
0
–
0
–
ns
2,3,4
Data output invalid from clock high
tOH
1.5
–
1.5
–
ns
2
Output enable low to output low Z
tLZOE
0
–
0
–
ns
2,3,4
Output enable high to output high Z
tHZOE
–
3.5
–
4.0
ns
2,3,4
Clock high to output high Z
tHZC
–
3.5
–
4.0
ns
2,3,4
tOHOE
0
–
0
–
ns
Clock high pulse width
tCH
2.4
–
2.5
–
ns
5
Clock low pulse width
tCL
2.3
–
2.5
–
ns
5
Address setup to clock high
tAS
1.5
–
1.5
–
ns
6
Data setup to clock high
tDS
1.5
–
1.5
–
ns
6
Write setup to clock high
tWS
1.5
–
1.5
–
ns
6,7
Chip select setup to clock high
tCSS
1.5
–
1.5
–
ns
6,8
Address hold from clock high
tAH
0.5
–
0.5
–
ns
6
Data hold from clock high
tDH
0.5
–
0.5
–
ns
6
Write hold from clock high
tWH
0.5
–
0.5
–
ns
6,7
Chip select hold from clock high
tCSH
0.5
–
0.5
–
ns
6,8
ADV setup to clock high
tADVS
1.5
–
1.5
–
ns
6
ADSP setup to clock high
tADSPS
1.5
–
1.5
–
ns
6
ADSC setup to clock high
tADSCS
1.5
–
1.5
–
ns
6
ADV hold from clock high
tADVH
0.5
–
0.5
–
ns
6
ADSP hold from clock high
tADSPH
0.5
–
0.5
–
ns
6
ADSC hold from clock high
tADSCH
0.5
–
0.5
–
ns
6
Output enable high to invalid output
1 See “Notes” on page 17
12/1/04, v.1.2
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Timing characteristics for 2.5 V I/O operation
–166
Parameter
–133
Notes1
Symbol
Min
Max
Min
Max
Unit
Clock frequency
fMax
–
166
–
133
MHz
Cycle time
tCYC
6
–
7.5
–
ns
Clock access time
tCD
-
3.8
-
4.2
ns
Output enable low to data valid
tOE
–
3.5
–
4.0
ns
Clock high to output low Z
tLZC
0
–
0
–
ns
2,3,4
Data output invalid from clock high
tOH
1.5
–
1.5
–
ns
2
Output enable low to output low Z
tLZOE
0
–
0
–
ns
2,3,4
Output enable high to output high Z
tHZOE
–
3.5
–
4.0
ns
2,3,4
Clock high to output high Z
tHZC
–
3.5
–
4.0
ns
2,3,4
tOHOE
0
–
0
–
ns
Clock high pulse width
tCH
2.4
–
2.5
–
ns
5
Clock low pulse width
tCL
2.3
–
2.5
–
ns
5
Address setup to clock high
tAS
1.7
–
1.7
–
ns
6
Data setup to clock high
tDS
1.7
–
1.7
–
ns
6
Write setup to clock high
tWS
1.7
–
1.7
–
ns
6,7
Chip select setup to clock high
tCSS
1.7
–
1.7
–
ns
6,8
Address hold from clock high
tAH
0.7
–
0.7
–
ns
6
Data hold from clock high
tDH
0.7
–
0.7
–
ns
6
Write hold from clock high
tWH
0.7
–
0.7
–
ns
6,7
Chip select hold from clock high
tCSH
0.7
–
0.7
–
ns
6,8
ADV setup to clock high
tADVS
1.7
–
1.7
–
ns
6
ADSP setup to clock high
tADSPS
1.7
–
1.7
–
ns
6
ADSC setup to clock high
tADSCS
1.7
–
1.7
–
ns
6
ADV hold from clock high
tADVH
0.7
–
0.7
–
ns
6
ADSP hold from clock high
tADSPH
0.7
–
0.7
–
ns
6
ADSC hold from clock high
tADSCH
0.7
–
0.7
–
ns
6
Output enable high to invalid output
1 See “Notes” on page 17
Snooze Mode Electrical Characteristics
Description
Current during Snooze Mode
ZZ active to input ignored
ZZ inactive to input sampled
ZZ active to SNOOZE current
ZZ inactive to exit SNOOZE current
12/1/04, v.1.2
Conditions
Symbol
ZZ > VIH
ISB2
tPDS
tPUS
tZZI
tRZZI
Alliance Semiconductor
Min
Max
Units
30
mA
cycle
cycle
cycle
2
2
2
0
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Key to switching waveforms
Rising input
Falling input
don’t care
Undefined
Timing waveform of read cycle
tCYC
tCL
tCH
CLK
tADSPS
tADSPH
ADSP
tADSCS
tADSCH
ADSC
LOAD NEW ADDRESS
tAH
tAS
A1
Address
A2
tWS
A3
tWH
GWE, BWE
tCSS
tCSH
CE0, CE2
CE1
tADVS
tADVH
ADV
ADV inserts wait states
OE
tOE
tHZOE
tLZOE
Dout
Q(A1)
Read
Q(A1)
Suspend
Read
Q(A1)
Read
Q(A2)
tCD
tHZC
tOH
Q(A2)
Q(A2Ý01)
Q(A2Ý10)
Q(A2Ý11)
Q(A3)
Q(A3Ý01)
Q(A3Ý10)
Burst
Burst
Suspend
Burst
Read
Burst
Burst
Burst
Read
Read
Read
Read
Q(A3)
Read
Read
Read
DSEL*
Q(A 2Ý01) Q(A 2Ý10) Q(A 2Ý10) Q(A 2Ý11)
Q(A 3Ý01) Q(A 3Ý10) Q(A 3Ý11)
Note: Ý = XOR when LBO = high/no connect; Ý = ADD when LBO = low. BW[a:d] is don’t care.
*Outputs are disabled within two clk cycles after DSEL command
12/1/04, v.1.2
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Timing waveform of write cycle
tCYC
tCL
tCH
CLK
tADSPS
tADSPH
ADSP
tADSCS
tADSCH
ADSC
ADSC LOADS NEW ADDRESS
tAS
tAH
A1
Address
A3
A2
tWS
tWH
tADVS
tADVH
tDS
tDH
BWE
BW[a:d]
tCSS
tCSH
CE0, CE2
CE1
ADV SUSPENDS BURST
ADV
OE
Din
D(A1)
Read
Q(A1)
Suspend
Write
D(A1)
D(A2)
Read
Q(A2)
D(A2Ý01)
Suspend
Write
D(A 2)
D(A2Ý01)
D(A2Ý10)
D(A2Ý11)
D(A3)
ADV
ADV
ADV
Suspend
Burst
Burst
Burst
Write
Write
Write
D(A 2Ý01) Write
D(A 2Ý01)
D(A 2Ý10) D(A 2Ý11)
D(A3Ý01)
Write
D(A 3)
D(A3Ý10)
Burst
Write
D(A 3Ý01)
ADV
Burst
Write
D(A 3Ý10)
Note: Ý = XOR when LBO = high/no connect; Ý = ADD when LBO = low.
12/1/04, v.1.2
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Timing waveform of read/write cycle (ADSP Controlled; ADSC High)
tCYC
tCL
tCH
CLK
tADSPH
tADSPS
ADSP
tAH
tAS
A2
A1
Address
A3
tWH
tWS
GWE
CE0, CE2
CE1
tADVH
tADVS
ADV
OE
tDS tDH
Din
D(A2)
tOE
tCD
tLZC
Dout
DSEL
Read
Q(A1)
tHZOE
Q(A1)
Suspend
Read
Q(A1)
tOH
tLZOE
Q(A3)
Read
Q(A2)
Suspend
Write
D(A 2)
Read
Q(A3)
ADV
Burst
Read
Q(A 3Ý01)
Q(A3Ý01)
ADV
Burst
Read
Q(A 3Ý10)
Q(A3Ý10)
Q(A3Ý11)
ADV
Burst
Read
Q(A 3Ý11)
Note: Ý = XOR when LBO = high/no connect; Ý = ADD when LBO = low.
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Timing waveform of read/write cycle(ADSC controlled, ADSP = HIGH)
tCYC
tCL
tCH
CLK
tADSCS
tADSCH
ADSC
tAS
A1
ADDRESS
A5
A4
A3
A2
A7
A6
tWS
tAH
A8
A9
tWH
GWE
tCSS
tCSH
CE0,CE2
CE1
ADV
OE
tOE
tLZOE
Q(A1)
Dout
tLZOE
tHZOE
Q(A2)
Q(A3)
Q(A8)
Q(A4)
D(A5)
READ
Q(A1)
12/1/04, v.1.2
READ
Q(A2)
READ
Q(A3)
READ
Q(A4)
Q(A9)
tDH
tDS
Din
tOH
D(A6)
D(A7)
WRITE WRITE WRITE
D(A6) D(A7)
D(A5)
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READ
Q(A8)
READ
Q(A9)
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Timing waveform of power down cycle
tCH
tCYC
tCL
CLK
tADSPS
tADSPS
ADSP
ADSC
A2
A1
ADDRESS
tWH
tWS
GWE
tCSS
tCSH
CE0,CE2
CE1
ADV
OE
tOE
Din
tLZOE
tHZOE
D(A2)
D(A2(Ý01))
tHZC
Dout
Q(A1)
tPUS
tPDS
ZZ Recovery Cycle
ZZ
Normal Operation Mode
ZZ Setup Cycle
tZZI
tRZZI
Isupply
ISB2
READ SUSPEND
Q(A1) READ
Q(A1)
12/1/04, v.1.2
Sleep
State
Alliance Semiconductor
READ SUSPEND CONQ(A2) WRITE TINUE
D(A2) WRITE
D(A2 Ý01)
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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%
10%
GND
90%
10%
Figure A: Input waveform
DOUT
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)
DOUT
353Ω / 1538Ω
319Ω / 1667Ω
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, and 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, and BW[a:d].
8 Chip select refers to CE0, CE1, and CE2.
12/1/04, v.1.2
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Package dimensions: 100-pin quad flat pack (TQFP)
A1
A2
b
c
D
E
e
Hd
He
L
L1
α
TQFP
Min
Max
0.05
0.15
1.35
1.45
0.22
0.38
0.09
0.20
13.80
14.20
19.80
20.20
A2
c
A1
L1
L
Hd
D
b
e
0.65 nominal
15.80
16.20
21.80
22.20
0.45
0.75
α
He E
1.00 nominal
0°
7°
Dimensions in millimeters
12/1/04, v.1.2
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Ordering information
Package
TQFP x 32
TQFP x 36
–166 MHz
–133 MHz
AS7C33256PFD32A-166TQC
AS7C33256PFD32A-133TQC
AS7C33256PFD32A-166TQI
AS7C33256PFD32A-133TQI
AS7C33256PFD36A-166TQC
AS7C33256PFD36A-133TQC
AS7C33256PFD36A-166TQI
AS7C33256PFD36A-133TQI
Note: Add suffix ‘N’ with the above part number for Lead Free Parts (Ex. AS7C33256PFD32A-166TQCN)
Part numbering guide
AS7C
33
256
PF
D
32/36
A
–XXX
TQ
C/I
X
1
2
3
4
5
6
7
8
9
10
11
1. Alliance Semiconductor SRAM prefix
2. Operating voltage: 33 = 3.3V
3. Organization: 256 = 256K
4. Pipelined mode
5. Deselect: D = double cycle deselect
6. Organization: 32 = x32; 36 = x36
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)
11. N = Lead free part
12/1/04, v.1.2
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AS7C33256PFD36A
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Alliance Semiconductor Corporation
Copyright © Alliance Semiconductor
2575, Augustine Drive,
All Rights Reserved
Santa Clara, CA 95054
Part Number:AS7C33256PFD32A
AS7C33256PFD36A
®
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
Document Version: v.1.2
www.alsc.com
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