AL4CS211
AL4CS221
AL4CS231
AL4CS241
AL4CS251
Data Sheets
Version 1.1
AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
Amendments
07.11.01
10.17.01
Preliminary Version 1.0
Version 1.1, Added DC and AC timing data
AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
December 14, 2001
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AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
AL4CS211/AL4CS221/AL4CS231/AL4CS241/
AL4CS251 (512 x9, 1k x9, 2k x9, 4k x9, 8k x9)
Synchronous FIFO
Contents:
1.0 Description ________________________________________________________________ 4
2.0 Features___________________________________________________________________ 4
3.0 Applications________________________________________________________________ 4
4.0 Chip Information ___________________________________________________________ 5
4.1 Marking Information _____________________________________________________________ 5
4.1 Ordering Information_____________________________________________________________ 5
5.0 Pin-out Diagram ____________________________________________________________ 6
6.0 Block Diagram _____________________________________________________________ 6
7.0 Pin Definition and Description ________________________________________________ 7
8.0 Memory Operations _________________________________________________________ 8
8.1 Inputs and Outputs _______________________________________________________________ 8
8.2 Controls ________________________________________________________________________ 9
8.3 Flags__________________________________________________________________________ 11
9.0 Multiple Devices Bus Expansion and Cascading _________________________________ 12
9.1 Width Expansion Configuration ___________________________________________________ 12
9.2 Depth Expansion ________________________________________________________________ 12
10.0 Electrical Characteristics ___________________________________________________ 14
10.1 Absolute Maximum Ratings ______________________________________________________ 14
10.2 Recommended Operating Conditions ______________________________________________ 14
10.3 DC Characteristics _____________________________________________________________ 14
10.4 AC Electrical Characteristics_____________________________________________________ 15
10.5 Timing Diagrams_______________________________________________________________ 16
11.0 Mechanical Drawing ______________________________________________________ 23
11.1 7x7mm 32-pin TQFP Package ____________________________________________________ 23
11.2 32-pin PLCC Package___________________________________________________________ 24
AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
December 14, 2001
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AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
1.0 Description
The AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251 series memory products are high-
performance, low-power 9-bit read/write FIFO (First-In-First-Out) memory chips. They are
specially designed to buffer high speed streaming data for a wide range of communication
applications, such as optical disk controllers, Local Area Networks (LANs), SONET (Synchronous
Optical Network).
The input data is synchronous with a free-running clock (WCLK), and input-enable pins (/WEN1,
/WEN2). Data is written into the FIFO on every clock when enable pins are asserted. The output is
synchronous with the other free-running clock (RCLK) and enables (/REN1, /REN2). An Output
Enable pin (/OE) is provided at the read port for tri-state control of the output port. The FIFOs can
output two fixed flags, Empty Flag( /EF) and Full Flag (/FF), and two programmable flags, Almost-
Empty (/PAE) and Almost-Full (/PAF). The offsets of the /PAE and /PAF flags are loaded when
Load pin (/LD) goes low.
2.0 Features
•
•
•
•
•
•
•
•
•
512 x9-bit cell array (AL4CS211)
1,024 x9-bit cell array (AL4CS221)
2,048 x9-bit cell array (AL4CS231)
4,096 x9-bit cell array (AL4CS241)
8,192 x9-bit cell array (AL4CS251)
100/133 MHz Operation
10/7.5 ns read/write cycle time
Independent Read and Write operations
Empty and Full flags support
•
•
•
•
Programmable Almost-Empty and
Almost-Full flags
Output enable (data skipping)
3.3V power supply with 5V tolerant
Available in a 32-pin Thin Quad Flat
Pack (TQFP) and 32-pin plastic
leaded chip carrier (PLCC) packages
3.0 Applications
•
•
•
•
•
•
•
Routers
ATM switches
Cable modems
Wireless base stations
SONET(Synchronous Optical Network) multiplexers
Multimedia systems
Time base correction (TBC)
AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
December 14, 2001
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AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
4.0 Chip Information
4.1 Marking Information
AL4CS2X1
X-XX-XX
Part Number: X = 1, 2, 3, 4, 5 as
AL4CS211, AL4CS221, AL4CS231,
AL4CS241, AL4CS251
Package: XX =
J:
PLCC
PF: TQFP
Speed Grade: XX = -10, -7.5, ..
Version Number: X = A, B, C..
XXXXX
Lot Number
XXXX
Date Code
4.1 Ordering Information
The ordering information for AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251 are:
Part number
AL4CS211/221/231/241/251(A-10-PF)
AL4CS211/221/231/241/251(A-7.5-PF)
AL4CS211/221/231/241/251(A-10-J)
AL4CS211/221/231/241/251(A-7.5-J)
Package
32-pin plastic
TQFP(7x7mm)
32-pin plastic
TQFP(7x7mm)
32-pin plastic
PLCC
32-pin plastic
PLCC
Power Supply
+3.3V±10%
+3.3V±10%
+3.3V±10%
+3.3V±10%
Status
Sample in Aug., 2001
Sample in Aug., 2001
Sample in Aug., 2001
Sample in Aug., 2001
AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
December 14, 2001
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