CD4028 – BCD to Decimal Decoder

You are currently viewing CD4028 – BCD to Decimal Decoder
  • Post author:
  • Reading time:1 mins read

CD4028 – BCD-to-Decimal Decoder

The CD4028 is a BCD-to-decimal or binary-to-octal decoder consisting of 4 inputs, decoding logic gates, and 10 output buffers. A BCD code applied to the 4 inputs, A, B, C, and D, results in a high level at the selected 1-of-10 decimal decoded outputs. Similarly, a 3-bit binary code applied to inputs A, B, and C is decoded in octal at outputs 0–7. A high level signal at the D input inhibits octal decoding and causes outputs 0–7 to go LOW.

All inputs are protected against static discharge damage by diode clamps to VDD and VSS.


  • Wide supply voltage range: 3.0V to 15V
  • High noise immunity: 0.45 VDD (typ.)
  • Low power TTL compatibility: fan out of 2 driving 74L or 1 driving 74LS
  • Low power
  • Glitch free outputs
  • “Positive logic” on inputs and outputs
  • This is a Thru-Hole Device


  • Code conversion
  • Address decoding
  • Indicator-tube decoder

Farees Ahmed

The aim of this blog is to serve as a quick reference guide for the Curious. Appreciate your feedback and comments !