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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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Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Potentiometer Questions Started by norbss Yesterday at Space Varmint New Member Sep 3, Oh, Texas Instruments say it is obsolete do not show its datasheet. Apr 14, 2.

74HC table of pin connections? | Electronics Forums

Apr 14, 7. Forums New posts Search forums. Hey, but thanks for reply. Design b 74HC divoders. Apr 14, 8. You must log in or register to reply here. Hello First question here. So that’s the purpose of the “other” mode.

74HC Datasheet(PDF) – NXP Semiconductors

Design 74HC dividers. Apr 14, 4. Mikebits Well-Known Member Sep 1, Is the Qd output the divide by 10 frequency? Apr 14, 5. I have used decade counters using the “carry output” but I don’t have one hooked up right now.


Datasheet «MC54/74HC390»

You’re maybe confusing this with the term “symmetrical”. And just because a datsaheet is a synchronous counter doesn’t mean that it’s synchronous in every sense or will be synchronous in cascade.

Welcome to our site! I think I got it now. Did you derive that from the data sheet? You’ll need to choose a username 744hc390 the site, which only take a couple of moments here. The Qd output of most any counter that is not a pure binary counter is often non-symmetrical, that is, the output is not a perfect square wave.

74HC390 Datasheet

Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Media New media New comments Search media. I don’t know what that other configuration is.

Post the part number of the part you’re using, and any data you have on it. 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 and then you WILL have a symmetrical output. I intend to use the 74hc data sheet: I noticed your signature. Q0 would be Qa.


Well those pins are 74hc309 on the pinout. You must log in or sign up to reply here. You do have to be careful with counters. Space Varmint New Member Sep 1, Apr 14, 1.

By continuing to use this site, you are consenting to our use of cookies. It was not a stupid question. But you’ll still potentially have a non-symmetrical Qd output if it’s not a straight binary counter. You have to use a series counter to get full 74hd390 operation in all phases. It appears, from datazheet at the datasheet, that indeed Q4 is a divide by 10 output, when the chip is datasheey for a decade counter.

Thread starter Space Varmint Start date Sep 1, Using a Qd output as 74uc390 gate input for a frequency counter would be a bad idea!