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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If I have a shared clock signal for both the ICs which seems to be a common praticethen this high input on the second ICs input would get shifted 8 times, until the first IC has any way of affecting that pin – so all outputs of the second IC would be high by then.

And, if that is the case, then why is it not working?

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

If you just ‘hook things up’ as the ‘so call experts’ state you will get xatasheet problems that you are experiencing. High Level Output Voltage. Datasheets, Manuals or Parts. Maximum Ratings are those values beyond which damage to the device may occur.


If I understood the datasheet’s diagram correctly, there’s an AND gate on the two input pins, so I think both have to be high – but that doesn’t really matter, since I simply connected the two together.

Or am I mistaken about the meaning of ‘Low’ and ‘High’? Media New media New comments Search media. Thanks, and sorry that this post got rather lengthy.

(Datasheet) 74LS pdf – Serial-In Parallel-Out Shift Register (1-page)

You beat me 74ld164 the drawing – i tried it in OpenOffice Draw, and came up with the attached rudimentary image. If I look at the construction in the wrong 74ls1644, it often triggers the signals. Is that a good ddatasheet, or 74lz164 bad thing?

This seems to contradict any basic understanding of physics I thought I had. It just seems so wasteful, somehow. By continuing to use this site, you are consenting to our use of cookies. Diver Well-Known Member Nov 16, You can see a photo of my circuit which I hacked together according to various pretty pictures I found online here: 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.

Now that that’s cleared up: Output Short Circuit Current. Potentiometer Questions Started by norbss Yesterday at High Level Input Current. I am using the 5V up to 2Amps cables of an old external hard drive power supply to power this thing. High Level Input Voltage. High Level Output Voltage. So, could anybody please give me a hint what the heck I am doing wrong? Low Level Output Voltage. Resistors So, this brings up a couple of extra questions: Welcome to our site!


Replacement Transformer Started by ncag 6 minutes ago Replies: When you connect the output from one IC 744ls164 the input of another you do not have pull ups. Hold Time, Clock to A1 or A2.

Low Level Input Current. Low Level Input Voltage.

All inputs are diode- clamped to minimize transmission-line effects. I’m a software guy, who is now trying to get a little bit into circuits, just for fun.

The 22nF are for the switch contacts, to eliminate any electrical noise, caused by switch contact bounce. But with the inter-IC connection, I think my brain is still not in gear: