This part is a kind of semiconductor called 74C42.

Function of this product has BCD-to-Decimal Decoder.

Manufacturers : Fairchild

Image and pinout :

Some of the text within the PDF file :

MM74C42 BCD-to-Decimal Decoder October 1987 Revised May 2002 MM74C42 BCD-to-Decimal Decoder General Description The MM74C42 one-of-ten decoder is a monolithic complementary MOS (CMOS) integrated circuit constructed with N- and P-channel enhancement transistors. This decoder produces a logical “0” at the output corresponding to a four bit binary input from zero to nine, and a logical “1” at the other outputs. For binary inputs from ten to fifteen all outputs are logical “1”. Features s Supply voltage range: 3V to 15V s Tenth power TTL compatible: drive 2 LPTTL loads s High noise immunity: 0.45 VCC (typ.) s Low power: 50 nW (typ.) s Medium speed operation: 10 MHz (typ.) with 10V VCC Applications • Automotive • Data terminals • Instrumentation • Medical electronics �� [ ... ]

74C42 PDF Datasheet Download