M54HC42 Overview
The M54/74HC42 is a high speed CMOS BCD-TODECIMAL DECODER fabricated in silicon gate C2MOS technology. It has the same high speed performance of LSTTL bined with true CMOS low power consumption. 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.