The DM74LS155N is an Integrated Circuit (IC) component that belongs to the TTL (Transistor-Transistor Logic) family. It is a 1-of-4 dual 2-line to 4-line demultiplexer with common enable inputs. Here is an overview of its key features:
1. Dual 2-line to 4-line demultiplexer: The DM74LS155N contains two demultiplexers, each with two data inputs (A and B) and four output lines (Y0 to Y3). It can direct one out of four possible data sources to the output lines based on the binary value presented at inputs A and B.
2. Common enable inputs: The component includes two enable inputs, namely E1 and E2. When either E1 or E2 is HIGH, the corresponding demultiplexer is activated, and the selected input is passed to the output lines. When both E1 and E2 are LOW, all output lines are in a high-impedance state.
3. Active LOW enable inputs: The enable inputs (E1 and E2) operate with active LOW logic, meaning they become active (i.e., enable the associated demultiplexer) when pulled to a logic LOW state. Conversely, a logic HIGH on the enable input disables the demultiplexer.
4. TTL compatible: The DM74LS155N is designed as per the TTL logic standards, making it compatible with other TTL components
