modulo 9 down counter

Discussion in 'Homework Help' started by rucio, Apr 19, 2009.

  1. rucio

    Thread Starter New Member

    Apr 19, 2009
    Hi all
    I got to design a modulo9 down counter (BCD decade counting like 9,8,7,6,5,4,3,2,1,0,9,8,7,6,5,4,3,2,1,0,.....) so I've connected 4 JK-MS fliplops using gates, connected them to th clock, and added gates to detect 0.
    So, when i got the state (0000) and have detected this, how do I should put the state 9 (1001) to my counter? using which device, and - how connected to the flipflops?
    the cuircuit:
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    Take a look at thr data sheet for a 74168. It's an up/down counter with a parallel load feature.