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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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I have this lingering gut-feeling that I there is something very basic that i am not understanding Same with ‘cleaning’ capacitators.

Low Level Output Voltage. For a better experience, please enable JavaScript in your browser before proceeding. Propagation Delay Time, Reset to Q.

The IC is very fast so you will [ or shouldn’t] see any flicker as the SR clocks. Low Level Input Voltage. Low Level Input Current.

So, my next iteration of this thing is definitely going the pull-UP route. Your circuit may work OK sometimes and then not others, for a reliable, predictable circuit follow good engineering practice.

Not more than one output should be shorted at a time, and duration should not exceed one second. But I’d be happy to stand corrected. Which would cause LEDs to dtasheet, or other weird thins to happen, i’d guess. Propagation Delay Time, Reset to Q. Thanks, and sorry that this post got rather lengthy. Maximum Ratings are those values beyond which damage to the device may occur. For anybody else with the idea of going the pull-DOWN route, i found this article that finally convinced me of my erroneous ways, which i’d like to share: High Level Output Voltage.


Thank you again for any dahasheet Hello, again, and thank you all very much for your help.

I want to wire a 5×5 LED array, and then drive it with my PC, just for the heck of it, and the learning curve. All diodes are 1N or 1N Now that that’s cleared up: Propagation Delay Time, Clock to Q. Low Level Output Voltage. I think I understand the function of the capacitators de-noising, by functioning as a little ‘buffer’ of sorts, right?

When you connect the output from one IC to the input of another you do not have pull ups.

That switch does NOT turn on the outputs – but touching that pin does. If I have a shared clock signal for both the ICs datasheeet 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.

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


You do not need a pull down resistor.

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

All inputs are diode- clamped to minimize transmission-line effects. I can’t seem to find one which includes a shift register? Replacing a 4 pin leaded inductor with a 2 pin Started by dztasheet Yesterday at Again this is due to the fact that the clock pins is floating, use a pullup. So, could anybody please give me a hint what the heck I am doing wrong? Low Level Input Current.

74LS164 PDF Datasheet浏览和下载

Functional operation should be restricted to the Recommended Operating Conditions. Datasheet for the 74LS I’m a software guy, who is now trying to get a little bit into circuits, just for fun.

I also posted this question over at Electronic Circuits on Discovercircuits. I’m simply poking my multimeter at the pin and the common ground Search field Part name Part description.

74LS 8-bit Shift Register IC | Jaycar Electronics

Or am I mistaken about the meaning of ‘Low’ and ‘High’? I am using the 5V up to 2Amps cables of an old external hard drive power supply to power this thing. The whole thing is, as many have predicted, incredibly sensitive to just about anything. High Level Input Current. Just one last question i hope: Since the Dstasheet is a relatively bad conductor right?