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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This is what I have so far This will allow the system clock to be free running and the register stopped on command with the other clock input. Just out of curiosity Phillips or NXP as they are now can be a bit wordy but are easier to follow. I did have all this working nicely with a chip: This is the way most chips work. Pin 6 is the clock inhibit and should be connected to ground for correct operation. This indicates that the pin should have a zero to activate the name of the function.
At first I tried modifying the wiring then I stripped it all out and started over. A change from low-to-high on the clock inhibit input should only be done when the clock input is high.
By utilizing input clamping diodes, switching transients are minimized and system design simplified. That’s exactly what I needed to know.
74HC pinouts (shiftIN)
Clocking is done on the low-to-high level edge of the clock pulse via a two input 74ls66 NOR gate, which permits one input to be used as a clock enable or clock inhibit function. 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.
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. I hope this serves others too.
74LS165N, 74LS165PC, 74LS166
I’ve stripped back my code to troubleshoot it. Capacitor Expert By Day, Enginerd by night. That is to reset it you need to put it low.
Therefore to take it out of reset you place it high.
74LS 데이터시트(PDF) – Motorola, Inc
Your buying lead can then be posted, and the reliable suppliers will quote via our datssheet message system or other channels soon. The image in my diagram had come from the TI datasheet. I have found that TI data sheets are always very thorougher but steeped in their own convention. The most misleading part of this image however is that the blue lead from Arduino GND looks like datasheef goes to PIN 15 on the – it actually goes to the ground rail and PIN 15 is connected to Ard 8, but is hidden.
Yep, I’m getting that. Serial data flow is inhibited during parallel loading.
Don’t know where it came from. It should be connected to the input pin of the arduino or the serial input of dahasheet cascading chip. What else in the data sheet are you having trouble with? For those that follow, the correct pinouts are No pin 13 is an output not an input. A buffered direct clear input overrides all other inputs, including the clock, and sets all flip-flops to zero.
The was quite easy I thought but the datasheet has gotten me a little foxed. The connections to the Arduino are: Synchronous loading occurs on the next clock pulse when this is low and the parallel data inputs are enabled.
Hence, I ran it all dataxheet with the and got on quite well with it. Does anyone have a keener eye than me? Want to post a buying lead? I don’t know if this helps