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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74LS165N, 74LS165PC, 74LS166

Yep, I’m getting that. When high, this input enables the serial data input and couples the eight flip-flops for serial shifting with each clock pulse. That is to reset it you need to put it low. I started this thread whilst trying to get my head around the different pin labeling on the By utilizing input clamping diodes, switching transients are minimized and system design simplified.

Datasgeet 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. James’ datasheet link yields a somewhat friendlier datasheet than the one I’d found from TI. Hence, I ran it all up with the and got on quite well with it. 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 hope this serves others too.

74LS 데이터시트(PDF) – Motorola, Inc

Want to post a buying lead? That’s exactly what I needed to know. 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.

74lls166 This is what I have so far For those that follow, the correct pinouts are Pin 6 is the clock inhibit and should be connected to ground for correct operation. How long will receive a response. Therefore to take it out of reset you place it high. The connections to the Arduino are: No pin 13 is an output not an input. Synchronous loading occurs on the next clock pulse when this is low and the parallel data inputs are enabled.

74HC pinouts (shiftIN)

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 74lz166 15 is connected to Ard 8, but is hidden. Don’t know where it came from. This is the way most chips work.

At first I tried modifying the wiring then I stripped it all out and started over. Serial data flow is inhibited during parallel loading. You will probably find a line over the dwtasheet Master Reset. What else in the data sheet are you having trouble with? It should be connected to the input pin of the arduino or the serial input of a cascading chip.


We didn’t get time to make the swap back then but the daasheet is back on the table now and we’re both stumped as to why it’s not working.

This indicates that the pin should have a zero to activate the name of the function. Your buying lead can then be posted, and the reliable suppliers will quote via our online message system or other channels soon.

Capacitor Expert By Day, Enginerd by night.

A buffered direct clear input overrides all other inputs, including the clock, and sets all flip-flops to zero. The image in my diagram had come from the TI datasheet. Does anyone have vatasheet keener eye than me? I did have all this working nicely with a chip: This will allow the system clock to be daatsheet running and the register stopped on command with the other clock input. Clocking is done on the low-to-high level edge of 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.

Just out of curiosity