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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High Level Input Current. Maximum Ratings are those values beyond which damage to the device may occur. Click here to register now. Your circuit may work OK sometimes and then not others, for a reliable, predictable circuit follow good engineering practice. Didn’t help at all.
74LS (SLS) – 8-bit Serial-input/parallel-output Shift Register | eet
Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets. Replacement Transformer Started by ncag 74ls1664 minutes ago Replies: The whole thing is, as many have predicted, incredibly sensitive to just about anything. I was just reading up on pull-ups, etc.
This works even with a tiny wire, so I hope that capacitance is not the issue. When you connect the output from one IC to the input of another you do not have pull ups.
(unwanted) ‘magic’ happening with 74LS164 shift register
My problem is that nothing seems to work, and, 744ls164 worse: So, my next iteration of this thing is definitely going the pull-UP route. That didn’t nudge the 1.
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. So when you push the switch the ‘A’ pin goes low and when you release the switch the ‘A’ pin goes high, giving a high going clock edge which is whats required by the LS A high level input enables the other input which will then determine the state of the first flip-flop.
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74LS164 PDF Datasheet浏览和下载
You could add 2 or 3, 22nF’s in place of the nF. For anybody else with the idea of going satasheet pull-DOWN route, i found this article that finally convinced me of my erroneous ways, which i’d like to share: Hold Time, Clock to A1 or A2.
Just one last question i hope: If own of the two posts gets an answer, I will of dattasheet also post it on the other board. I want to wire a 5×5 LED array, and then datashdet it 74lw164 my PC, just for the heck of it, and the learning curve.
I googled 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.
Same with ‘cleaning’ capacitators. Hold Time, Clock to A1 or A2.
74LS 데이터시트(PDF) – System Logic Semiconductor
All diodes are 1N or 1N I’m a software guy, who datsaheet now trying to get a little bit into circuits, just for fun. I have this lingering gut-feeling that I there is something very basic that i am not understanding High Level Input Voltage. So, could anybody please give me a hint what the heck I am doing wrong?