CD4027 datasheet of Dual J-K Flip-Flop

When we want to use flip-flops with CMOS. Often we meet CD4027. It is dual J-K flip-flops that are monolithic complementary MOS integrated circuits.

We have seen many circuits that use them. Of course, making a great circuit we should understand detail of any parts( basic enough).

Slow down!

If you are beginner. You should read how flip-flop works below.

CD4027 datasheet

So, in this post, we will learn about the CD4027 datasheet. See Its internal structure and pinout. It consists of N- and P-channel enhancement mode transistors.

And, It looks like CD4013. But they are different pins, be careful.

Each flip-flop has independent J, K, set, reset, and clock inputs and buffered Q and Q outputs.

Learn more:

CD4027 Pinout

We use MC14027 or CD4027 or TC4027 as CMOS-IC, inside JK-Flip-Flop and 16 pins. See pinout below.

Which each pin has a different function as shown below.


CD4027 pinout and symbol circuit

These flip-flops are edge sensitive to the clock input and change state on the positive-going transition of the clock pulses.

Pulse edges trigger

The connection diagram

Set or reset is independent of the clock and is accomplished by a high level of the respective input.

The diode clamps across VDD and VSS to protect against damage to All inputs, due to static discharge.

Learn: How to use 555 timer circuits


  • Wide supply voltage range: 3.0V to 15V
  • High noise immunity: 0.45 V(typ.)
  • Low power TTL compatibility: Fan out of 2 driving 74L or 1 driving 74LS
  • Low power: 50 nW (typ.)
  • Medium speed operation: 12 MHz (typ.) with 10V supply

Then See truth table


How to use CD4027 (example circuits)

Reading the datasheet makes us bored. And don’t see the usage picture clearly. Let’s see the example circuits diagram.

The experimentation of 2-bit binary counter

2 bit-binary counter using cd4027

Traffic light circuit

01-the schematic diagram of first circuit

Automatic Fan Controller circuit


Buy CD4027 on amazon

Here are a few related circuits you may find helpful, too:

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