These parallel-in or serial-in, serial-out shift registers fea- ture gated clock inputs and an overriding clear input. All inputs are buffered to lower the drive. 74LS Counter Shift Registers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for 74LS Counter Shift Registers. Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor.
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By utilizing input clamping diodes, switching transients are minimized and system design simplified. Synchronous loading occurs on the next clock pulse when this is low and the parallel data inputs are enabled.
Pin 6 is the clock inhibit and should be connected to ground for correct operation. Just out of curiosity The image in my diagram had come from the TI datasheet. Want to post a buying lead?
74LS165N, 74LS165PC, 74LS166
Don’t know where it came from. Clocking is inhibited when either of adtasheet clock inputs are held high, holding either input low enables the other clock input. The was quite easy I thought but the datasheet has gotten me a little foxed.
No pin 13 is an output not an input. I have found that TI data sheets are always very thorougher but steeped in their own convention.
I don’t know if this helps I did have all this working nicely with a chip: Clocking is done on the low-to-high level edge datashdet the clock pulse via a two input positive NOR gate, which permits one input to be used as a clock enable or clock inhibit function. Serial data flow is inhibited during parallel loading.
What else in the data sheet are you having trouble with?
Phillips or NXP as they are now can be a bit wordy but are easier to follow. You will probably find a line over the words Master Reset. The connections to the Arduino are: This is what I have so far Hence, I ran it all up with the and got on quite well with it. That is to reset it you need to put it low. We didn’t get time to make the swap back then but the project is back on the table now and we’re both stumped as to why it’s not working.
Does anyone have a keener eye than me? The LS is a parallel-in or serial-in, serial-out shift register and has a complexity of 77 equivalent gates with gated clock inputs and an overriding clear input.
Motorola 74LS Series Datasheets. 74LS, SN54LS Datasheet.
That’s exactly what I needed to know. How long will receive a response. This indicates that the pin should have a zero to activate the name of the function. I’ve stripped back my code to troubleshoot it. A change from low-to-high on the clock inhibit input should only be done when the clock input is high. This is datsaheet way most chips work.
The most misleading part of this image however is that the blue lead from Arduino GND looks like it goes to PIN 15 on the – it actually goes to the ground rail and PIN 15 is connected to Ard 8, but is hidden.
Capacitor Expert By Day, Enginerd by night. It should be connected to the input pin of the arduino or the serial input of a cascading chip. Therefore to take it out of reset you place it high.
I started this thread whilst trying to get my head around the different pin eatasheet on the When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse.
Click here to Download. For those that follow, the correct pinouts are I had one mysteriously in my box-o-bits Now my order of 74HC chips has arrived I have found that the pinouts are not only different but have different names.
James’ datasheet link yields a somewhat friendlier datasheet than the one I’d found from TI. I hope this serves others too. Maybe I’ve got the input pin pull-down resistors the wrong way round!?
74LS 데이터시트(PDF) – Motorola, Inc
Your buying lead can then be posted, and the reliable suppliers will quote via our online message system or other channels soon. Yep, I’m getting that. This will allow the system clock to be free running and the register stopped on command with the other clock input.
A buffered direct clear input overrides all other inputs, including the clock, and sets all flip-flops to zero.