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can't make a SN74LS92N IC work please help

Clayton Kirkwood
Prodigy 20 points

I need a ttl square wave signal to be divided by 12. I have tried to use a SN74LS92N IC to do this task but I can not get the desired output or any switching output at all. How should all inputs and outputs be connected to make this IC functional? Resetting the IC is not needed for my application. Istrictly need it to divide pulses by 12. I currently have 5 volts on pin 5, ground on pin 10, 0 to 5 volt square wave 2 to 24 kHz input on pin 14, pin 1 wired to pin 12, desired output of .05 mA load from pin 8, and have tried both grounding and leaving open pins 6 and 7.  If anyone can help me it will be much appreciated.  I have been denied help every where I have looked and am very frustrated trying to get this circuit to work.

  • 0
    TI__Mastermind 46480 points

    Hello Clayton

    Your connections are correct. Pin 6 and 7 should be gnd. If you are looking at pin 8 then you should see it low for 6 counts then high for 6 counts. 

  • 0 in reply to Chris Cockrill
    Prodigy 20 points

    I still get nothing out of pin 8.  when testing voltage, pin 8 stays low as long as 6 and 7 are grounded but if 6 and 7 are open then pin 8 reads high.  for some reason when I test the voltage at pin 12,  it is showing around 4 volts and this is supposed to be the input.  I have tried 3 of these chips and have got the same result with each.  I don't think it is possible that I have the pins confused.  When looking at the topside, the side that is labled, and with the notched end pointing up, pins 1-7 on the left from top to bottom, then pins 8-14 on the right, bottom to top.  I still can't get the chip to count.