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  1. #1
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    Test D Flip-Flop IC

    Hi,

    Anyone can tell me how to check the D-ff 74LS573 whether in good condition, please teach me how to test and connect it.

    Thanks....

    •   Alt5th August 2005, 04:05

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  2. #2
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    Re: Test D Flip-Flop IC

    Use a breadbard for this test.
    Connect Vcc (20) to 5V, GND (10) to 0V.
    Use 10k resistors conncted to+5V and all D-inputs: (2, 3, 4 ,5 ,6 ,7 ,8 and 9).
    Connect OE (1) to 0V.
    Build a one-pulse generator based on, for example, 555 monostabile, and instal a switch through which you can trigg this generator.
    Connect output of this generator (in 555 it will be pin 3 ) to Enable Latch of 573 (11).
    Connect 8 small leds to the 573 outputs (19, 18, 17 ,16, 15, 14, 13 and 12) through 470-1kΩ resistors - to 0V.
    Take some jumper wires and shorten selected 573 inputs to 0V.
    Push button to generate a pulse and see if the relevant outputs have "L" - leds should be OFF; other outputs should be "H" - leds ON.
    Shorten other inputs, generate another pulse and check outputs ..
    Good luck and regards,
    IanP


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    •   Alt5th August 2005, 04:28

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  3. #3
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    Re: Test D Flip-Flop IC

    Quote Originally Posted by IanP
    Build a one-pulse generator based on, for example, 555 monostabile, and instal a switch through which you can trigg this generator.
    IanP
    Now i dont have the 555, still got any simple method to test the IC?

    Thanks...



    •   Alt5th August 2005, 04:47

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  4. #4
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    Re: Test D Flip-Flop IC

    If you don't have 555 connect the LE input through 10kΩ resistor to 5V. Connect a momentary switch to this input and GND .. Press this switch/button and generate a pulse ..
    It doesn't matter if this switch generates instead of single pulse a series of pulses ..
    And again, shorten all or selected inputs to 0V and press this button ..
    Regards,
    IanP


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  5. #5
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    Re: Test D Flip-Flop IC

    Quote Originally Posted by IanP
    Connect output of this generator (in 555 it will be pin 3 ) to Enable Latch of 573 (11).
    Connect 8 small leds to the 573 outputs (19, 18, 17 ,16, 15, 14, 13 and 12) through 470-1kΩ resistors - to 0V.
    Take some jumper wires and shorten selected 573 inputs to 0V.
    IanP
    May i know what is 573?

    Thanks...



    •   Alt5th August 2005, 08:43

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  6. #6
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    Re: Test D Flip-Flop IC

    573 = 74LS573
    Regards,
    IanP


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