resistor used with 74AC14

Discussion in 'General Electronics Chat' started by threegold, Jun 5, 2009.

  1. threegold

    Thread Starter New Member

    Jul 1, 2008
    2
    0
    i have a circuit, the output of 74AC14 goes to CPLD.
    do anyone know what is t[​IMG]he purpose of 2.2k resistor here... pls view the attachment for circuit...

    thanks alot
     
  2. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
    Maybe to protect from possible spikes.
     
  3. Papabravo

    Expert

    Feb 24, 2006
    10,180
    1,800
    The resistor in conjunction with the input capacitance of the gate input forms a single pole low pass filter. It is also known as a damping resistor. Assuming an input capacitance of say 12 pf, the RC time constant of the LPF would be
    Code ( (Unknown Language)):
    1.  
    2. 12 pf * 2200 = 26.4 nanoseconds
    3.  
     
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