IC8051----> cd4094be

Discussion in 'General Electronics Chat' started by student111, Dec 9, 2013.

  1. student111

    Thread Starter New Member

    Dec 9, 2013

    i have some problem of use of 8051. The problem is I have not enough 8051 pins to use .Therefore i want to use connected cd4094be . i want to ask my connection of 8051 and 4094 is right ? (aboved picture) Any mistakes >? THANK YOU
    Last edited: Dec 9, 2013
  2. tubeguy

    Well-Known Member

    Nov 3, 2012
    Your connections are OK. (You didn't show power and ground on the 4094 or ground on the 8051, but will assume you know that).

    But, with a 5 volt power supply, the CD4094 can only source or sink around 0.88ma per output according to my datasheet. That's not enough current for typical LED's.
    Use a type 74HC or 74HCT4094 instead. Those can source or sink at least 4ma, and use a 5 volt power supply.

    If you must use a CD4094 then a buffer will be needed on the outputs to drive LED's.
    Last edited: Dec 9, 2013
  3. SgtWookie


    Jul 17, 2007