AS7C3256PFS18A-4TQC 查看數據表（PDF） - Alliance Semiconductor
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AS7C3256PFS18A-4TQC Datasheet PDF : 11 Pages
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April 2000
Advance information
®
3.3V 256K × 16/18 pipeline burst synchronous SRAM
AS7C3256PFS16A
AS7C3256PFS18A
• 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 OE access 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)
• Pentium® compatible architecture and timing
• 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
• 2.5V or 3.3V I/O operation with separate VDDQ
• Automatic power down: 30 mW typical standby power
• NTD™ pipeline architecture available
(AS7C3256NTD16A/AS7C3256NTD18A)
CLK
ADV
ADSC
ADSP
A[17:0]
GWE
BWE
BWd
BWc
BWb
BWa
CE0
CE1
CE2
ZZ
OE
18
Power
down
LBO
CLK
Q0
CE
Burst logic
CLR
Q1
18
16
D
Q
CE
Address
register
CLK
D
Q
DQd
Byte Write
registers
CLK
D
Q
DQc
Byte Write
registers
CLK
D
Q
DQb
Byte Write
registers
CLK
D
Q
DQa
Byte Write
registers
CLK
D Enable Q
register
CE
CLK
D Enable Q
delay
register
CLK
256K×32/36
Memory
18
array
36/32
36/32
4
OE
Output
registers
CLK LE
Input
registers
CLK
36/32
FT DATA [35:0]
[31:0]
NC 1
NC 2
NC 3
VDDQ 4
VSSQ 5
NC 6
NC 7
DQb 8
DQb 9
VSSQ 10
VDDQ 11
DQb 12
DQb 13
FT 14
VDD 15
NC 16
VSS 17
DQb 18
DQb 19
VCCQ 20
VSSQ 21
DQb 22
DQb 23
DQpb/NC 24
NC 25
VSSQ 26
VDDQ 27
NC 28
NC 29
NC 30
TQFP 14×20mm
80 A
79 NC
78 NC
77 VDDQ
76 VSSQ
75 NC
74 DQpa/NC
73 DQa
72 DQa
71 VSSQ
70 VDDQ
69 DQa
68 DQa
67 VSS
66 NC
65 VDD
64 ZZ
63 DQa
62 DQa
61 VDDQ
60 VSSQ
59 DQa
58 DQa
57 NC
56 NC
55 VSSQ
54 VDDQ
53 NC
52 NC
51 NC
Note: pins 24, 74 are NC for ×16.
AS7C3256PFS16A- AS7C3256PFS16A- AS7C3256PFS16A- AS7C3256PFS16A-
3.5
3.8
4
5
Units
Minimum cycle time
6
6.7
7.5
10
ns
Maximum pipelined clock frequency
166.7
150
133.3
100
MHz
Maximum pipelined clock access time
3.5
3.8
4
5
ns
Maximum operating current
450
400
350
300
mA
Maximum standby current
60
60
60
60
mA
Maximum CMOS standby current (DC)
5
5
5
5
mA
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
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