[sdiy] 128 stage shift register? mc14562

[Scott Gravenhorst]

dan snazelle <subjectivity at hotmail.com> wrote:
>another one I am looking at using is the 4517 (just got 10 in the mail)
>
>for some odd reason it is not listed in my version of CMOS 
>COOKBOOK or in the any other CMOS books I have (they skip right 
>over it going from 4516 to 4518) 
>
>from what I can tell this chip is as easy to use as the 
>4031....you plug in a data and a clock, and pick the output you 
>want 
>
>unless I am missing something you SHOULD be able to cascade them to get 128 bits
>
>
>in the datasheet, they talk about using it as a digital 
>scratchpad but they dont actually show any applications 
>
>thanks!

Scratchpad RAMs, like 7489 were used in digital processes for holding temporary results, such
as a sum of numbers.  The output of the RAM would then be used in other computations.  So it
might be a bit difficult to show an application schematic that would make sense.

In my youth, I had some 7489 RAMs, these are 16 addressable 4 bit words.  I used them with a
switch panel to input numbers into the RAM, then a 555 timer clocked a counter connected to
the address lines of the RAM.  The output of the RAM was used to select a note from a salvaged
organ board and voila - cheesey top octave sequencer.  It was also fun to power it up and play
whatever power on random crap was in the RAM.




>> On 12/1/2011 8:00 AM, dan snazelle wrote:
>>> anyone have a line on a supplier of 4562's?
>>> 
>>> or know of another easy way to get 128bits?
>>> 
>>> thanks!
>>> 
>>> 
>> DigiKey has 'em (SOIC only):
>> 
>> http://search.digikey.com/us/en/products/CY29FCT520ATSOCT/296-14562-1-ND/555614
>> 
>> - Oren
>> 
>
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-- ScottG
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-- Scott Gravenhorst
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