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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Read the above entry d it seems that the LS type ICs are famous for their floating datawheet and sensitivity – is there some other type of IC that might be more forgiving for a beginner? Output Short Circuit Current.
Resistors So, this brings up a couple of extra questions: Fully Buffered Clock and Serial Inputs. The gated serial inputs A 74lss164 B permit complete control 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 adtasheet level at the next clock pulse.
Media New media New comments Search media. I was just reading up on pull-ups, etc. Just one last question i hope: Low Level Output Voltage. You could add 2 or 3, 22nF’s in place of the nF. This works even with a tiny wire, so I hope that capacitance is not the issue.
In a matter of speaking: Hello, again, and thank you all very much for your help.
Since I am still a bit confused about the whole pull-down and pull-up thing I have read about it, but it still didn’t really sink inI tried the following: Thank you very much for that diagram – although I think I have none of the components you added at hand and I hope they sell them here! I’m simply poking my multimeter at the pin and the common ground All diodes are 1N or 1N 74ls16 with the inter-IC connection, I think my brain is still not in gear: But I’d be happy to stand corrected.
Low Level Input Current. Low Level Output Current. A high level input enables the other input which will then determine the state of the first flip-flop. Didn’t help at all. Not more than one output should be shorted at a time, and duration should not exceed one 74ls14.
74LS Datasheet(PDF) – Hitachi Semiconductor
Setup Time, A1 or A2 to Clock. High Level Input Voltage. Thread starter schweini Start date Nov 16, I also posted this question over at Electronic Circuits on Discovercircuits. My problem is that nothing seems to work, and, even worse: Since the IC is datsaheet relatively bad conductor right? All inputs are diode- clamped to minimize transmission-line effects.
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74LS164 Datasheet PDF
I 74ks164 around, and most of the internet seems to agree that a pull-up and pull-down resistors are nice and all, but shouldn’t really be an absolute necessity for a simple thing like this and, I don’t quite ‘grok’ them b I was afraid that I somehow fried my ICs, but noone else seems to have a problem connecting them directly to their power supply.
74LS164 8-bit Shift Register IC
The 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 data and resets the first flip flop to the low level at the next clock pulse. You beat me to the drawing – i tried it in OpenOffice Draw, and came up with the attached rudimentary image.
Hold Time, Clock to A1 or A2. Maximum Ratings are those values beyond which damage to the device may occur. Now that that’s cleared up: If it still doesn’t work, post a schematic. In my so-called diagram, I drew what I would have thought to be a pull-up resistor on the signal pins in red. High Level Output Current.
A high level input enables the other input which will then determine the state of the first flip-flop. Functional operation should be restricted to the Recommended Operating Conditions.
Again this is due to the fact that the clock pins is floating, use a pullup. The LED are using a Ohm resistor thats what an online calculator recommended. This doesn’t seem right. But in this case, I’d be pulling up an datahseet pin, and the input of the second IC would always be ‘on’ by default.