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Using a CD4017 to drive a 7 Segment LCD display

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11flint

New Member
Hello everyone! I have up to now, only built counters and timers using TTL IC's. I always used a TTL decade counter to drive a 7 segment decoder IC, and from the decoder to the & segment display.

Very foolishy I bought some 4017 counters and 4511 decoders, thinking that the setup would be the same.

I'm used to counters having Q^0, Q^1, Q^2, and Q^3 outputs, which would drive the decoders, but the 4017 has outputs from A to G, which I don't know what to do with.

If the 4017 outputs are already "decoded", I'm totally guessing that I don't need "decoder" IC's (4511), but how the h*ll do you get the 4017 to drive a standard 7 seg display?


Your help would be GREATLY appreciated!
 

crutschow

Well-Known Member
Most Helpful Member
The 4517 is a decade counter with 10 outputs for counts 0 through 9. It can't readily be used to control a 7-segment display.

A 4026 is a decade counter that will directly drive a 7-segment LED display.

A 4054 or 4055 will decode BCD to 7-segment LCD

The 4511 will drive an LED display, not an LCD.
 

11flint

New Member
Thanks for that crutschow! I'll just use 4510 counters to drive 4511 decoders to drive my LED displays.
 

jbeng

Member
crutschow said:
The 4517 is a decade counter with 10 outputs...
I think you meant "4017".... :)

crutschow said:
The 4511 will drive an LED display, not an LCD.
The 4543 will decode BCD to 7-segment and drive LCD's or LED's (either common anode or common cathode).
It's a pretty versatile display driver.
 
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