The MC14028B decoder is constructed so that an 8421 BCD code on the four inputs provides a decimal (oneoften) decoded output, while a 3bit binary input provides a decoded octal (oneofeight) code output with D forced to a logic "0". Expanded decoding such as binarytohexadecimal (oneof16), etc., can be achieved by using other MC14028B devices. The part is useful for code conversion, address decoding, memory selection control, demultiplexing, or readout decoding.