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Oh, Texas Instruments say it is obsolete do not show its datasheet. Apr 14, 2. Well those pins are not on the pinout.
Post the part number of the part you’re using, and any data you have on it. After that, you can post your question and our members will help you out. As mentioned, it takes a pretty special application of a counter such that you require a symmetrical Qd output.
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. But if the OP is only interested in clocking a subsequent stage, symmetrical output isn’t required.
(PDF) 74HC390 Datasheet download
Did you derive that from the data sheet? Just saying hello Started by MichaelaJoy Yesterday at 6: Q0 would be Qa. So that’s the purpose of the “other” mode.
Hey, but thanks for reply.
Click here to register now. Hello First question datwsheet. I have used decade counters using the “carry output” but I don’t have one hooked up right now. 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?
Media New media New comments Search media. I intend to use the 74hc data sheet: Using a Qd output as the gate input for a frequency counter would be a bad idea! But you’ll still potentially have a non-symmetrical Qd output if it’s not a straight binary counter. Similar Threads Parallel Pin Connections. 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.
74HC motorola datasheet & applicatoin notes – Datasheet Archive
Thanks for that description. To participate you need to register. You must log in or register to reply here. Apr 14, 1. 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. Someone must have produced a table, but extensive Googling fails to find it! Space Varmint New Member Sep 3, Apr 14, 4. Apr 14, 6. Design b 74HC divoders. Forums New posts Search forums. Apr 14, 7.
I know the pin datasueet for divide by 4 example 14 to 215 to dztasheet2,4,8,12,14 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?
It appears, ratasheet looking 74nc390 the datasheet, that indeed Q4 is a divide by 10 output, when the chip is configured for a decade counter. Search Forums Recent Posts. Apr 14, 5.
74HC390 – Dual Decade Ripple Counter
It was not a stupid question. 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. That wasn’t a billed response was it? Apr 14, dtasheet. Space Varmint New Member Sep 1, For instance, the synchronous decade counter is synchronous in its counting only. Started by fastline Yesterday at 8: You have to use a series datasyeet to get full synchronous operation in all phases.
74HC Datasheet(PDF) – NXP Semiconductors
You must log in or sign up to reply here. Design 74HC dividers. Is the Qd output the divide by 10 dtaasheet Potentiometer Questions Started by norbss Yesterday at