I'been doing a PISO shift register using a 74LS166, but I get no results, I don't know what is happening. Here is the top view and my approach.

In my approach:

  • BLUE wire = Clear
  • PURPLE(MARRON) = Clock Pulse
  • YELLOW = Clock Inhibit
  • GREEN = Shift/Load

As you guys can see there is a space in the first place. There I have to put the serial input but i don't where I have to connect it.

Hope you can help me to make it works. Thanks in advance.

enter image description here

My approach


closed as unclear what you're asking by Voltage Spike, Bence Kaulics, Daniel Grillo, Dave Tweed Aug 20 '16 at 12:59

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  • 1
    \$\begingroup\$ I guess nobody will know what do you want. \$\endgroup\$ – Marko Buršič Nov 15 '15 at 7:24
  • \$\begingroup\$ @MarkoBuršič I want to implement a PISO swift register, the second picture is what I have done, but it doesn't work. I am confused with the serial input. I don't know what kind a signal (LOW or HIGH) it has to have. \$\endgroup\$ – Manuel Nov 15 '15 at 7:28
  • \$\begingroup\$ I depends on what you want to get after you have shifted the whole 8 bits, if you want 9th bit to be L then it has to be L, if you want H, then let it be H. \$\endgroup\$ – Marko Buršič Nov 15 '15 at 7:44
  • \$\begingroup\$ @MarkoBuršič Ok, I already put in L. Now, to load the 8 bits on the parallel input. What I have to do with the clock and the clock inhibit??. When I push the clock it seems that nothing happens. \$\endgroup\$ – Manuel Nov 15 '15 at 7:48
  • \$\begingroup\$ that layout looks ok what switches and buttes are you switching inwhat order? \$\endgroup\$ – Jasen Nov 15 '15 at 7:50
  1. set clk inhibit L, set Clear H,
  2. set parallel inputs.
  3. switch shift/load to L
  4. apply pulse to CLK
  5. switch shift/load to H
  6. apply pulses on CLK
  • \$\begingroup\$ Marko, thanks a lot, the LED is lighting. I'm so gratefull \$\endgroup\$ – Manuel Nov 15 '15 at 8:03

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