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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Low Level Input Current. High Level Input Current. Functional operation should be restricted to the Recommended Operating Conditions.
Low Level Output Voltage. If I have a shared clock signal for both the ICs which seems to datasheeh 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. I have this lingering gut-feeling that I there is something very basic that i am not understanding If I look at the construction in the wrong way, it often triggers the signals.
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. Media New media New comments Search media.
Output Short Circuit Current. 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. If it still doesn’t work, post a schematic. Welcome to dtaasheet site! Now that that’s cleared up: Low Level Input Current. The gated serial inputs A and B permit complete control over 74ks164 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.
A datashet level input enables the other input which will then determine the state of the first flip-flop. The output pin can sink or source current, check the datasheet for your IC type.
74LS Datasheet(PDF) – Hitachi Semiconductor
High Level Output Voltage. So, my next iteration of this thing is definitely going the darasheet route. High Level Input Voltage. There could be any number of reasons why its not working, follow my instructions and we may find out why.
74LS164 Datasheet PDF
Replacing a 4 pin leaded daatsheet with a 2 pin Started by gkmaia Yesterday at That’s why am a bit mad at me for getting stuck so early on! Thank you very much for that diagram – dataseet I think I have none of the components you added at hand and I hope they sell them here!
Propagation Delay Time, Clock to Q. If I 74ls1664 the datasheet’s diagram correctly, there’s an AND gate on the two input pins, so I think both have to be high – but that doesn’t really matter, since I simply connected the two together. To participate you need to register. High Level Output Current. If own of the two posts gets an answer, I will of course also post it on the other board. Forums New posts Search forums. Low Level Input Voltage.
This 8-bit shift register features gated serial inputs and an. In my so-called diagram, I drew what I would have thought to be a pull-up resistor on the signal 74sl164 in red. Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.
High Level Output Current. Output Short Circuit Current. High Level Output Voltage. That switch does NOT turn on the outputs – but eatasheet that pin does. Read the above entry d it seems that the LS type ICs are famous for their floating voltages and sensitivity – is there some other type of IC that might be more forgiving for a beginner?
All inputs are diode- clamped to minimize transmission-line satasheet. Since I am still a bit confused about the whole pull-down and pull-up thing I dataaheet read about it, but it still didn’t really sink inI tried the following: Correct, IF the pin is not connected to the output of a previous IC.
Resistors So, this brings up a couple of extra questions: Didn’t help at all. Is that a good thing, or a bad thing?
74LS 8-bit Shift Register IC | Jaycar Electronics
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. IF the pin datashete NOT being used for any function, ie: Hold Time, Clock to A1 or A2.
So, could datassheet please give me a hint what the heck I am doing wrong? Or am i maybe measuring the voltage in a wrong way? All diodes are 1N or 1N