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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74LS164 8-bit Shift Register IC

The whole thing is, as many have predicted, incredibly sensitive to just about anything. If it still doesn’t work, post a schematic. When you connect the output from one IC to the input of another you do not have pull ups.

This works even with a tiny wire, so I hope that capacitance is not the issue. If I have a shared clock signal for both the ICs which 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.

Potentiometer Questions Started by norbss Yesterday at High Level Input Current. So, my next iteration of this thing is definitely going the pull-UP route. 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 A high level input enables the other input which will then determine the state of the first flip-flop.


Low Level Input Voltage. 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 You do not need a pull down resistor. Fully Buffered Clock and Serial Inputs. Thanks, and sorry that this post got rather lengthy. Low Level Output Voltage.

74LS164 Datasheet PDF

Media New media New comments Search media. High Level Output Current.

To participate datzsheet need to register. It just seems so wasteful, somehow. Low Level Input Current. Again this is due to the fact that the clock adtasheet is floating, use a pullup. The output pin can sink or source current, check the datasheet for your IC type. Didn’t help at all. Propagation Delay Time, Reset to Q.

Thank you again for any help! This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register. 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.

74LS (FAIRCHILD) PDF技术资料下载 74LS 供应信息 IC Datasheet 数据表 (1/5 页)

Additionally, I wanted to add that: You beat me to the drawing – i datashedt it in OpenOffice Draw, and came up with the attached rudimentary image. That didn’t nudge the 1. 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 Daatasheet, but noone else seems to have a problem connecting them directly to their power supply.


Datasheey, Manuals or Parts. Thread starter schweini Start date Nov 16, In my so-called diagram, I drew what I would have thought to be a pull-up resistor on the signal pins in red. I have this lingering gut-feeling datashfet I there is something very basic that i am not understanding 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.

Low Level Input Voltage.

(Datasheet) 74LS pdf – Serial-In Parallel-Out Shift Register (1-page)

Not more than one output should be shorted at a time, and duration should not exceed one second. So, could anybody please give me a hint what the heck I am doing wrong?

What is the standard way of doing this? IF the pin is NOT being used for any function, ie: That switch does Daatasheet turn on the outputs – but touching that datadheet does. Propagation Delay Time, Clock to Q. 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. I am a complete beginner, so please excuse any incredibly stupid mistakes i made!

Since the IC is a relatively bad conductor right? 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.

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