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.
|Published (Last):||21 November 2010|
|PDF File Size:||10.62 Mb|
|ePub File Size:||13.49 Mb|
|Price:||Free* [*Free Regsitration Required]|
74LS164 Datasheet PDF
Hence, the input of my second IV would be high all the time thanks to the soon-to-be soldered pull-up. 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.
I do understand that the pull-ups and -downs would be ‘good engineering’ – but may I have your blessing not to put in the capacitators, this being a purely experimental thing? Hold Time, Clock to A1 or A2.
74LS NTE Equivalent NTE74LS IC-TTL 8-BIT SHIF – Wholesale Electronics
Thank you again for any help! The gated serial inputs A and B permit complete 74ls1644 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. High Level Output Current. All inputs are diode- clamped to minimize transmission-line effects.
Low Level Input Voltage.
Now that that’s cleared up: Output Short Circuit Current. Thread starter schweini Start date Nov 16, All diodes are 1N or 1N Welcome to our site!
Datasheets, Manuals or Parts. I googled around, and most of the internet seems to agree that a pull-up and pull-down resistors are nice fatasheet all, but shouldn’t really be an absolute 74le164 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. Didn’t help at all. The 22nF are for the switch contacts, to eliminate any electrical noise, caused by switch contact bounce.
Diver Well-Known Member Nov 16, 74lw164 Just one last question i hope: But in this case, I’d be pulling up an output pin, and the input of the second IC would always be ‘on’ by default.
(unwanted) ‘magic’ happening with 74LS164 shift register
High Level Input Current. Same with ‘cleaning’ capacitators. 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.
High Level Output Voltage. That didn’t nudge the 1.
To participate you need to register. All diodes are 1N or 1N If I look at the construction in the wrong way, it often triggers the signals. Replacement Transformer Started by ncag 6 minutes ago Replies: I can’t seem to find one which includes a shift register? Search field Part name Part description.
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: This seems to contradict any basic understanding of physics I thought I had.
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 is NOT being used for any function, ie: Click here to register now.
Since the IC is a relatively bad conductor right? Electro Tech is an online community with overmembers who enjoy talking about and building electronic circuits, projects and gadgets.
74LS Datasheet(PDF) – System Logic Semiconductor
What is the standard way of doing this? Propagation Delay Time, Clock to Q.
Maximum Ratings are those values beyond which damage to the device may occur. The IC is very fast so you will [ or shouldn’t] see any flicker as the SR clocks. Hold Time, Clock to A1 or A2. Datasheet for the 74LS Thanks, and sorry that this post got rather lengthy.
In my so-called diagram, I drew what I would have thought datashret be a pull-up resistor on the signal pins in red.