The M54/74HC42 is a high speed CMOS BCD-TO- DECIMAL DECODER fabricated in silicon gate C2MOS technology.
It has the same high speed performance of LSTTL combined 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. This device also can be used as a 3-to-8 LINE DECODER, when the D input is assigned as a disable input. This de- vice is useful for code conversion, address decod- ing, memory selection, demultiplexing, or readout decoding.
All inputs are equipped with protection circuits against static discharge and transient excess voltage.