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 Forum index » DIY Hardware and Software » Lunettas - circuits inspired by Stanley Lunetta
4000 series cmos chips, using only half pins, etc
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amplex



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PostPosted: Wed Jun 03, 2009 5:05 pm    Post subject: 4000 series cmos chips, using only half pins, etc Reply with quote  Mark this post and the followings unread

Just wondering, for all 4xxx cmos chips, do the unused inputs need to be grounded? for example, i am about to add 4001 quad 2in NOR gates, but only want to add 2 out of 4, should the inputs on the top half of the chip go to ground or do i need to bother? didn't see anything on the datasheet about it, but im assuming they are like 40106 etc..
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Blue Hell
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PostPosted: Wed Jun 03, 2009 5:20 pm    Post subject: Reply with quote  Mark this post and the followings unread

For all CMOS type devices all unused input pins should be either tied to ground or to the positive supply rail. Or more in general, high impedance inputs should have a well defined level otherwise they'll follow whatever electron happens to be moving in that connection.
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also .. could someone please turn down the thermostat a bit.
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