M74HC42 Overview
The M74HC42 is an high speed CMOS BCD TO DECIMAL DECODER fabricated with silicon gate C2MOS technology. A BCD code applied to the four inputs A-D selects one of ten decimal outputs Y0 - Y9, which goes low to fifteen gives a high level at all outputs. This device also can be used as a 3 to LINE DECODER, when the D input is assigned as a disable input.