AL4CS241 AverLogic Technologies, Inc., AL4CS241 Datasheet - Page 4

• Manufacturer Part Number: AL4CS241
• Manufacturer: AverLogic Technologies, Inc.

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
AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
3.0 Applications
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
Routers
ATM switches
Cable modems
Wireless base stations
SONET(Synchronous Optical Network) multiplexers
Multimedia systems
Time base correction (TBC)
AL4CS211/AL4CS221/AL4CS231/AL4CS241/AL4CS251
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
December 14, 2001
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