July 2004
®
AS7C33256NTF32A
AS7C33256NTF36A
3.3V 256K×32/36 Flowthrough Synchronous SRAM with NTD
TM
Features
• Organization: 262,144 words × 32 or 36 bits
• NTD
™1
architecture for efficient bus operation
• Fast clock to data access: 6.5/7.5 ns
• Fast OE access time: 3.5 ns
• Fully synchronous operation
• Flow-through mode
• Asynchronous output enable control
1. NTD is a trademark of Alliance Semiconductor Corporation.
All
trademarks mentioned in this document are the property of their respective
owners.
• Available in 100-pin TQFP
• Byte write enables
• Clock enable for operation hold
• Multiple chip enables for easy expansion
• 3.3 core power supply
• 2.5V or 3.3V I/O operation with separate V
DDQ
• 30 mW typical standby power
• Self-timed write cycles
• Interleaved or linear burst modes
• Snooze mode for standby operation
Logic Block Diagram
A[17:0]
18
D
Address
register
Burst logic
Q
18
CLK
CE0
CE1
CE2
R/W
BWa
BWb
BWc
BWd
ADV / LD
LBO
ZZ
D
Q
18
Write delay
addr. registers
CLK
Control
logic
CLK
Write Buffer
CLK
256K x 32/36
SRAM
Array
DQ[a,b,c,d]
32/36
D
Data
Q
Input
Register
CLK
32/36
32/36
32/36
32/36
CLK
CEN
OE
Output
Buffer
32/36
OE
DQ[a,b,c,d]
Selection Guide
–65
Minimum cycle time
Maximum clock access time
Maximum operating current
Maximum standby current
Maximum CMOS standby current (DC)
7.5
6.5
250
120
30
-75
8.5
7.5
225
100
30
Units
ns
ns
mA
mA
mA
7/12/04, v. 1.0
Alliance Semiconductor
P. 1 of 14
Copyright © Alliance Semiconductor. All rights reserved.
ISSI [ INTEGRATED SILICON SOLUTION, INC ]
