Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor. These 8-bit shift registers feature gated serial inputs and an asynchronous clear. A low logic level at either input inhibits entry of the new data, and resets the first. This 8-bit shift register features gated serial inputs and an asynchronous reset. The gated serial inputs (A and B) permit complete control over incoming data as a.

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Or am i maybe measuring the voltage in a wrong way? I already had the circuit soldered, and being the stubborn guy i am and because of my lack of solder-removal-wickI tried it with pull-down resistors 1k to GNDagainst all recommendations i read online.

But everybody else seems to just hook these things up, and go with it. Potentiometer Questions Started by norbss Yesterday at Since the IC is a relatively bad conductor right? Diver Well-Known Member Nov 16, Fully Buffered Clock and Datwsheet Inputs.

The output pin can sink or source current, check the datasheet for your IC type. Low Level Input Current.

When you connect 74ls1664 output from one IC to the input of another you do not have pull ups. I am using the 5V up to 2Amps cables of an old external hard drive power supply to power this thing.

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74LS164 8-bit Shift Register IC

If it still doesn’t work, post a schematic. This doesn’t seem right. But in this case, I’d be pulling up an output pin, and the input of the second IC would always be ‘on’ by default. Didn’t help at all. I was just reading up on pull-ups, etc.

74LS (SLS) – 8-bit Serial-input/parallel-output Shift Register | eet

I 74ls1664 to wire a 5×5 LED array, and then drive it with my PC, just for the heck of it, and the learning curve. 74l1s64 gated serial inputs A and B permit complete control over incoming data as a low at either or both input s inhibits entry of the new datasheeet and resets the first flip flop to the low level at the next clock pulse.

So, my next iteration of this thing is definitely going the pull-UP route. Datasheets, Manuals or Parts. The 22nF are for the switch contacts, to eliminate any electrical noise, caused by switch contact bounce. Data at the serial inputs may be changed while the clock is high or low, but only information meeting the setup requirements will be entered clocking occurs or the low-to-high level transition of the clock input.

There could be any number of reasons why its not working, follow my instructions and we may find out why. This datasbeet seem very desirable to me? That’s why am a bit mad at me for getting stuck so early on!

Is that a good thing, or a bad thing? Propagation Delay Time, Clock to Q. Thank you two for the quick reply.

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74LS 8-bit Shift Register IC | Jaycar Electronics

Thread starter schweini Start date Nov 16, Not more than one output should be shorted at a time, and duration should not exceed one second. A high level input enables the other input which will then determine the state of the first flip-flop. This seems to contradict any basic understanding of physics I thought I had. Hold Time, Clock to A1 or A2. You need pull downs on both your push buttons. Media New media New comments Search media.

All diodes are 1N or 1N My problem is that nothing seems to work, and, even worse: Or am I mistaken about the meaning of ‘Low’ and ‘High’?

Setup Time, A1 or A2 to Clock. Just one last question i hope: Hence, the input of my second IV would be high all the time thanks to the soon-to-be soldered pull-up.

(unwanted) ‘magic’ happening with 74LS164 shift register

Setup Time, A1 or A2 to Clock. What is the standard way of doing this? High Level Output Voltage. High Level Input Current. Low Level Output Current. I am a complete beginner, so please excuse any incredibly stupid mistakes i made! Dataaheet Short Circuit Current. Hello, again, and thank you all very much for your help.