The CD4028BM is a CMOS BCD-to-Decimal Decoder/Driver consist 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. It meets all requirements of JEDEC tentative standard no. 13B, "standard specifications for description of "B" series CMOS devices".
High decoded output drive capability
Positive logic inputs and outputs - decoded outputs go high on selection