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AL422 Datasheet(PDF) 16 Page - List of Unclassifed Manufacturers

Part No. AL422
Description  AL422 3M-Bits FIFO Field Memory
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Maker  ETC1 [List of Unclassifed Manufacturers]
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AL422 Datasheet(HTML) 16 Page - List of Unclassifed Manufacturers

 
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AL422
AL422B
January 23, 2001
16
The 5V configuration (direct replacement of the previous AL422V5) is as follows:
The 3.3V configuration (direct replacement of the previous AL422V3) is as follows:
8.3 Application Notes
8.3.1 Irregular Read/Write
It is recommended that the WCK and RCK are kept running at least 1MHz at all times. The faster one
of WCK and RCK is used as the DRAM refresh timing clock and has to be kept free running. When
irregular FIFO I/O control is needed, keep the clock free running and use /WE or /RE to control the
I/O as follows:
The following drawing shows irregular clock and should be avoided:
VDD
DEC
5V
AL422B
0.1uF
2.2uF
VDD
DEC
3.3V
AL422B
3.3V
0.1uF
0.1uF
10
19
Data
/WE
AL422-17 Slow Write - Correct
WCK


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