The M74HC238 is a high speed CMOS 3 to 8 line decoder. There are three binary select inputs (A, B, and C) which determine which one of the eight outputs (Y0-Y7) will go high.
This chip has three enable inputs (G1, ~G2A, and ~G2B); when any enable pins are brought low (or high in G1's case), all output pins are pulled low.
This is a great tool if you need to increase the number of outputs on your micrcontroller.

This device comes in a 16-pin DIP package.

Features:

• High speed
• Wide operating voltage range (2 to 6VDC)
• Low power dissipation (~4µA)
• High noise immunity
• Symmetrical output impedance
• Balanced propagation delays
• Inputs equipped with protection circuits against static discharge and transient excess voltage

Documents:

• Datasheet