The CD4028 types are BCD to decimal or binary-to-octal decoders consisting of buffering on all 4 inputs, decoding-logic gates, and 10 output buffers. A BCD code applied to the four input, A to D, results in a high level at the selected one of 10 decimal decoded outputs. Similarly, a 3-bit binary code applied to inputs A through C is decoded in octal code at output 0 to 7 if D = "0". High drive capability is provided at all outputs to enhance dc and dynamic performance in high fan-out applications.

Features of CD4028 BCD to Decimal Decoder:

• BCD to decimal decoding or binary-to-octal decoding.
• High decoded output drive capability.
• "Positive logic" inputs and outputs……decoded outputs go high on selection.
• Medium-speed operation… tPHL, tPLH = 80 ns (typ.) @ VDD = 10 V.
• Standardized, symmetrical output characteristics.
• 100% tested for quiescent current at 20 V.
• Maximum input current of 1 µA at 18 V over full package-temperature range; 100 nA at 18 V and 25°C.
• Noise margin (full package-temperature range):
• 1 V at VDD = 5 V.
• 2 V at VDD = 10 V .
• 2.5 V at VDD = 15 V.

Applications of CD4028 BCD to Decimal Decoder:

• Code conversion.
• Indicator-tube decoder.
• Address decoding-memory selection control.