4553 ic simple question

Discussion in 'General Electronics Chat' started by thedarkotaku, Aug 30, 2012.

  1. thedarkotaku

    Thread Starter New Member

    Feb 28, 2011
    7
    0
    hey there guys. i've been trying to simplify making a 6 digit countdown circuit. currently i'm using 40110's 1 per digit and it works great, but i'd like to cut it back even further and was wondering if anyone knew of a cmos ic that would be like the 4553 that would drive 3 digits at once but countdown, or could the 4553 countdown instead of up? i've looked at datasheets and from what i've gathered it only counts up. i'm hoping i'm wrong. either way some advice would be great thanks!
     
  2. crutschow

    Expert

    Mar 14, 2008
    13,011
    3,233
    The 4553 can only count up.

    The 40110 is about as simple as you can do. Even if the 4553 would count down, you would still need a BCD to 7-segment decoder for each digit.
     
  3. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Have a look at the 4543. Motorola/OnSemi's datasheet for the MC14553 has a diagram for a six digit up-counter using two 4553's, two 4543's, and three transistors on page 6:
    http://www.onsemi.com/pub_link/Collateral/MC14553B-D.PDF
     
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