74HC390 DATASHEET PDF

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See detailed ordering and shipping information in the package dimensions section on page 6 of this data sheet. ORDERING INFORMATION. 74HC Datasheet, 74HC Dual Decade Ripple Counter Datasheet, buy 74HC 74HC Semiconductors are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74HC Semiconductors.

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To participate you need to register. The Qd output of most any counter that is not a pure binary counter is often non-symmetrical, that 774hc390, the output is not a perfect square wave.

Click here to register now. Similar Threads Parallel Pin Connections. After that, you can post your question and our members will help you out.

Apr 14, 7. But the larger counter chips that incorporate several like stages do not have access to the divide-by-two stages so you can’t do that. Post the part number of the part you’re using, and any data you have on it.

Stupid question / Decade Counter | Electronics Forum (Circuits, Projects and Microcontrollers)

I know the pin strappings for divide by 4 example 14 to 215 to 32,4,8,12,14 to Ground1 in and 13 out and divide by from a Mr Carlson’s Lab YouTube clip, but I would like to find the pin strappings for the other possibilities I believe I could divide by 2,5,10,20,25,50?

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BrownOut Banned Sep 1, So that’s the purpose of the “other” mode. By continuing to use this site, you are consenting to our use of cookies. That wasn’t a billed response was it?

Datasheet «MC54/74HC390»

You do have to be careful with counters. The TTL counter is such a beast. And when you want to cascade them, the various stages will be rippled even though within each stage it’s synchronous.

BrownOut Banned Sep 2, Potentiometer Questions Started by norbss Yesterday at Welcome to our site! Someone must have dahasheet a table, but extensive Googling fails to find it! Q0 would be Qa. Media New media New comments Search media.

If I remember correctly it is an asynchronous signal. Search Forums Recent Posts. And just because a counter is a synchronous counter doesn’t mean that it’s synchronous in every sense or will be synchronous in cascade. Is the Qd output the divide by 10 frequency? Design 74HC dividers. Started by fastline Yesterday at 8: You must log in or register to reply here.

You’re maybe confusing this with the term “symmetrical”. Ask a Question Want to reply to this thread or ask your own question? I want to experiment with 74HC chip. Switching lots of connections simultaneously. Space Varmint New Member Datashfet 3, You must log in or sign up to reply here.

However, if you don’t use the outputs to drive a display, you can switch the divide-by-2 section with the divide-by-five section so that the divide-by-two section is last in each decade chain 74hv390 then you WILL have a symmetrical output.

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Would it be suitable to run into another decade counter and get valid divide by ten BCD on all Q outputs if I run Qd from one into the clock of another? I think I got it now. I have used decade counters using the “carry output” but I don’t have one hooked up right now. Thanks for that description.

Apr 14, 1. Hello First question here. I don’t know what that other configuration is. Apr 14, 2.

74HC table of pin connections? | Electronics Forums

Design b 74HC divoders. Apr 14, 8.

Did you look at the datasheet of the SN74HC? Apr 14, 3. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. But if the OP is only interested in clocking a subsequent stage, symmetrical output isn’t required.

Apr 14, 9. Hey, but thanks for reply. It was not a stupid question. Space Varmint New Member Sep 1,