CD4543 7-Segment Latch/Decoder/Driver IC

This video demonstrates using the CD4543 7-Segment Latch/Decoder/Driver IC with a common anode type display. This is a very useful and inexpensive IC that can be used with common cathode (CC) or common anode (CA) displays.

[@clarkso65]

I have scoured the KZbin for a clear explanation on this chip for 6 years and there you are at long last!!! Thank you so much for sharing this.

[@AliKhan-ks4rm]

❤

[@ukaszgowacki3326]

Hi. Why we don't use resistors between the 4543 outputs and the display segments in this circuit. I also studied this system myself and noticed that it seemed to introduce this resistance itself, because adding resistors by me did not limit the current.

[@simoncarter568]

It seems like this chip will work without resistors

[@AnthonyFrancisJones]

Quite a few of these '4' series display driver chips limit the output current so you do not need resistors - but be careful as they often do. Best to build your prototype on the bread board with them in! Remember if you short a pin on the chip somewhere to the power supply (I have done this many a time) you could be feeding the power supply current directly to the 7 segment display and you will very quickly destroy it! Been there, done that and blamed faulty displays in the first instance!

[@milhousesmom]

how would you connect a second display for a 2 digit scoreboard?

[@simoncarter568]

You would need to use a microcontroller. If you want to keep it simple without a microcontroller, see my instructable on making a coin counter, this uses a different kind of counter IC and 7-segment decoder to display on 3 displays at once.