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Query about 4518 Dual 4 bit counter

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andipi

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At the moment I'm a bit of a novice with electronics, but so far, I am doing OK with my first big project. I am running into trouble however, understanding the workings of a chip which I plan to use. There is a good datasheet for it here:

**broken link removed**

The two questions I have are 1) What does the Vdd pin do?
2) Why does this chip have no ground pin?

Any advice/information would be greatly appreciated,

Many thanks, Andy
 
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