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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Output Short Circuit Current. So, my next iteration of this thing is definitely going the pull-UP route. So, could anybody please give me a hint what the heck 74s164 am doing wrong? 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. Low Level Input Current. Output Short Circuit Current.
74LS Datasheet(PDF) – System Logic Semiconductor
Didn’t help at all. You do not need a pull down resistor. Hence, the input of my second IV would be high all the time thanks to the soon-to-be soldered pull-up. Thank you very much for that diagram – although I think I have datashewt of the components you added at hand and I hope they sell them here!
Setup Time, A1 or A2 to Clock. You do not require pull downs.
Low Level Input Current. If I look at the construction in the wrong way, it often triggers the signals.
Diver Well-Known Member Nov 16, Which would cause LEDs to flicker, or other weird thins to happen, i’d guess. That’s why am a bit mad at me for getting stuck so early on!
74LS NTE Equivalent NTE74LS IC-TTL 8-BIT SHIF – Wholesale Electronics
You can see a photo of my circuit which I hacked together according to various pretty pictures I found online here: Not more than one output should be shorted at a time, and duration should not exceed one second.
Not more than one output should be shorted at a time, and duration should not exceed one second.
I do understand that the pull-ups and -downs would datasjeet ‘good engineering’ – but may I have your blessing not to put in the capacitators, this being a purely experimental thing? Hello, again, and thank you all very much for your help. When I switch on the lights in my house, this often triggers the signals. Additionally, I wanted to add that: The IC is a shift register so it does effectively have a latch function, any data in the SR is stored until the power is removed or its clocked out Hence, the input of my second IV would be high all the time thanks to the soon-to-be soldered pull-up.
But with the inter-IC connection, I think my brain is still not in gear: You need pull downs on both your push buttons. Hold Time, Clock to A1 datasheett A2.
74LS164 Datasheet PDF
But datashwet this case, I’d be pulling up an output pin, and the input of the second IC would always be ‘on’ by default. You beat me to the drawing – i tried it in OpenOffice Draw, and came up with the attached rudimentary image. A high level input enables the other input which will then determine the state of the first flip-flop.
Low Level Output Voltage.
The gated serial inputs A and B permit complete datasheeet over incoming data as a low at either or both input s inhibits entry of the new data and resets the first flip flop to the low level at the next clock pulse. The 22nF are for the switch satasheet, to eliminate any electrical noise, caused by switch contact bounce.
What is the standard way of doing this? Thanks, and sorry that this post got rather lengthy.