April 2000
Advance information
AS7C3256PFS16A
AS7C3256PFS18A
®
3.3V 256K × 16/ 18 pipeline burst synchronous SRAM
• Synchronous and asynchronous output enable control
• Economical 100-pin TQFP package
• Byte write enables
• Clock enable for operation hold
• Multiple chip enables for easy expansion
• 3.3V core power supply
• 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/ 5 ns
• Fast OEaccess time: 3.5/ 3.5/ 3.8/ 5.0 ns
• Fully synchronous register-to-register operation
• “Flow-through” mode
• Single-cycle deselect
- Double-cycle deselect also available (AS7C3256PFD16A/
AS7C3256PFD18A)
• 2.5V or 3.3V I/ O operation with separate V
DDQ
• Automatic power down: 30 mW typical standby power
• NTD™ pipeline architecture available
(AS7C3256NTD16A/ AS7C3256NTD18A)
• Pentium® compatible architecture and timing
LBO
CLK
ADV
ADSC
CLK
CE
Q0
Burst logic
256K×32/ 36
Memory
CLR
ADSP
Q1
A
18
16
18
NC
NC
NC
1
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
18
D
Address Q
A[17:0]
array
2
NC
NC
V
CE
CLK
3
register
V
4
DDQ
DDQ
V
V
5
SSQ
SSQ
NC
NC
6
36/ 32
36/ 32
GWE
BWE
DQpa/ NC
DQa
NC
DQb
DQb
7
D
Q
Q
Q
Q
DQd
8
BW
d
Byte Write
CLK
DQa
9
registers
V
V
10
11
12
13
SSQ
SSQ
V
V
DDQ
DDQ
D
DQa
DQa
DQb
DQc
BW
c
DQb
Byte Write
CLK
V
FT 14
SS
registers
TQFP 14×20mm
NC
V
15
DD
V
NC 16
DD
D
ZZ
V
17
18
19
20
21
22
23
SS
DQb
BW
b
DQb
DQb
DQa
DQa
Byte Write
CLK
registers
V
V
DDQ
CCQ
V
V
SSQ
SSQ
D
DQa
DQa
NC
DQb
DQa
BW
4
a
DQb
Byte Write
CLK
registers
DQpb/ NC 24
NC 25
NC
CE0
CE1
CE2
V
V
26
27
SSQ
SSQ
D
Q
Q
OE
V
V
DDQ
DDQ
Enable
Output
Input
registers
CLK
NC
NC
NC
NC 28
NC 29
NC 30
CE register
CLK
registers
CLK
LE
FT
D
Enable
Power
down
ZZ
delay
register
CLK
Note: pins 24, 74 are NC for ×16.
36/ 32
DATA [35:0]
[31:0]
OE
AS7C3256PFS16A- AS7C3256PFS16A- AS7C3256PFS16A- AS7C3256PFS16A-
3.5
3.8
6.7
150
3.8
400
60
4
7.5
133.3
4
5
10
100
5
Units
ns
Minimum cycle time
6
Maximum pipelined clock frequency
Maximum pipelined clock access time
Maximum operating current
166.7
3.5
450
60
MHz
ns
350
60
300
60
5
mA
mA
mA
Maximum standby current
Maximum CMOS standby current (DC)
5
5
5
NTD™ is a trademark of Alliance Semiconductor Corporation
Pentium® is a registered trademark of Intel Corporation.
DID 11-20027-A. 6/ 8/ 00
ALLIANCE SEMICONDUCTOR
1