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AS7C251MNTD18A Datasheet, PDF (1/18 Pages) Alliance Semiconductor Corporation – 2.5V 1M x 18 Pipelined SRAM with NTD | |||
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December 2004
AS7C251MNTD18A
®
2.5V 1M x 18 Pipelined SRAM with NTDTM
Features
⢠Organization: 1,048,576 words à 18 bits
⢠NTDâ¢architecture for efficient bus operation
⢠Fast clock speeds to 166 MHz
⢠Fast clock to data access: 3.5/3.8 ns
⢠Fast OE access time: 3.5/3.8 ns
⢠Fully synchronous operation
⢠Asynchronous output enable control
⢠Available in 100-pin TQFP package
⢠Individual byte write and global write
⢠Clock enable for operation hold
⢠Multiple chip enables for easy expansion
⢠2.5V core power supply
⢠Self-timed write cycles
⢠Interleaved or linear burst modes
⢠Snooze mode for standby operation
Logic block diagram
20
A[19:0]
CE0
CE1
CE2
R/W
BWa
BWb
ADV / LD
LBO
ZZ
D
Q
Address
register
burst logic
CLK
Control
logic
CLK
DQ [a,b]
18
D Data
input
Q
register
CLK
CLK
CEN
Selection guide
Minimum cycle time
Maximum clock frequency
Maximum clock access time
Maximum operating current
Maximum standby current
Maximum CMOS standby current (DC)
20
D
Q
Write delay
addr. registers
20
CLK
CLK
1M x 18
SRAM
array
18
18
18
18
CLK
Output
register
OE
18
OE
DQ [a,b]
-166
-133
6
7.5
166
133
3.5
3.8
290
270
85
75
40
40
Units
ns
MHz
ns
mA
mA
mA
12/23/04, v.2.2
Alliance Semiconductor
P. 1 of 18
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