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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Again this is due to the fact that the clock pins is floating, use a pullup. The gated serial inputs A and B permit complete control over incoming data as a low at either or both input s eatasheet entry of the new data and resets the first flip flop to the low level at the next clock pulse.

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. Setup Time, A1 or A2 to Clock. Hello, again, and thank you all very much for your help. Is that a good thing, or a bad thing? I already had the circuit soldered, and being the stubborn guy i am and because of my lack of solder-removal-wickI tried it datashret pull-down resistors 1k to GNDagainst all recommendations i read online.

Fully Buffered Clock and Serial Inputs. High Level Output Current. Which would cause LEDs to flicker, or other weird thins to happen, i’d guess.


74LS164 Datasheet PDF

What is the standard way of doing this? All inputs are diode- clamped to minimize transmission-line effects. Replacing a 4 pin leaded inductor with a 2 pin Started by gkmaia Yesterday at Resistors So, this brings up a couple of extra questions: You beat me to the drawing – i tried it in OpenOffice Draw, and came up dqtasheet the attached rudimentary image.


High Level Input Current.

Correct, IF the pin is not connected to the output of a previous IC. I want to wire a 5×5 LED array, and then drive it with my PC, just for the heck of vatasheet, and the learning curve. Datwsheet Delay Time, Clock to Q.

Output Short Circuit Current. Search field Part name Part description. And why in the name of everything that is holy and unholy does the single end of an otherwise unconnected wire to the CLOCK and RESET pins make the IC do stuff even if it’s the wrong stuffespecially if blasting them with 5V doesn’t seem to do anything at all?

That’s why am a bit mad at me for getting stuck so early on! This seems to contradict any basic understanding of physics I thought I had. Dataasheet Level Output Voltage. That switch does NOT turn on the outputs – but touching that pin does. Hold Time, Clock to A1 or A2.

Now that that’s cleared up: Setup Time, A1 or A2 to Clock. Maximum Ratings are those values beyond which damage fatasheet the device may occur. Functional operation should be restricted to the Recommended Operating Conditions.

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

If it still doesn’t work, post a schematic. Datasheets, Manuals or Parts. Low Level Output Current. Functional operation should be restricted to the Recommended Operating Conditions.

This doesn’t seem right. The mains electricity here in Costa Rica is horrendously ‘dirty’, so I wanted to eliminate that factor. Thank you two for the quick reply. I am a complete beginner, so please excuse any incredibly stupid mistakes i made! You must log in or register to reply here. Where this voltage is coming from, I don’t know. I do understand that the pull-ups and -downs would be ‘good engineering’ – but may I have your blessing not to put in the capacitators, this being a purely experimental thing?


Fully Buffered Clock and Serial Inputs.

And, if that is the case, then why is it not working? If I have a shared clock signal for both the ICs which seems to be a common praticeAs stated when inputs are connected to output pins, NO pull ups. Propagation Delay Time, Reset to Q. You do not require pull downs. Output Short Circuit Current. Hence, the input of my second IV would be high all the time thanks to the soon-to-be soldered pull-up. Or am I mistaken about the meaning of ‘Low’ and ‘High’? Hold Time, Clock to A1 or A2.

If own of the two posts gets an answer, I will of course also post it on the other board. Not more than one output should be shorted at a time, and duration should not exceed one second.

The LED 744ls164 using a Ohm resistor thats what an online calculator recommended. Propagation Delay Time, Clock to Q.

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.