AL422
AL422B
January 23, 2001
4
1.0 Description
The AL422 consists of 3M-bits of DRAM, and is configured as 393,216 words x 8 bit FIFO (first in
first out). The interface is very user-friendly since all complicated DRAM operations are already
managed by the internal DRAM controller.
Current sources of similar memory (field memory) in the market provide limited memory size which
is only enough for holding one TV field, but not enough to hold a whole PC video frame which
normally contains 640x480 or 720x480 bytes. The AverLogic AL422 provides 50% more memory
to support high resolution for digital PC graphics or video applications. The 50% increase in speed
also expands the range of applications.
2.0 Features
• 384K (393,216) x 8 bits FIFO organization
• Support VGA, CCIR, NTSC, PAL and
HDTV resolutions
• Independent read/write operations (different
I/O data rates acceptable)
• High speed asynchronous serial access
• Read/write cycle time: 20ns
• Access time: 15ns
• Output enable control (data skipping)
• Self refresh
• 5V or 3.3V power supply
• Standard 28-pin SOP package
3.0 Applications
• Multimedia systems
• Video capture systems
• Video editing systems
• Scan rate converters
• TV’s picture in picture feature
• Time base correction (TBC)
• Frame synchronizer
• Digital video camera
• Buffer for communications systems
4.0 Ordering Information
Part number
Package
Power Supply
Status
AL422B
28-pin plastic SOP
+5/+3.3 volt
Shipping
AL422V5
28-pin plastic SOP
+5 volt
Replaced by AL422B
AL422V3
28-pin plastic SOP
+3.3 volt
Replaced by AL422B
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