74138 3-to-8 Decoder IC

74138 3-to-8 Decoder IC The 74138 3-to-8 Decoder IC is a TTL logic device designed to decode three binary input signals into one of eight mutually exclusive output lines. It has three binary select inputs and three enable inputs, allowing the IC to select one of eight outputs based on the applied input combination. The outputs are typically active LOW, meaning the selected output goes LOW while the remaining outputs stay HIGH. Key Features - 3-to-8 line decoder - 8 individual output lines - Three binary select inputs - Three enable inputs for flexible control - Active-LOW outputs - TTL-compatible logic - 16-pin DIP package - Suitable for digital logic and address-decoding applications Applications - Memory address decoding - Digital logic circuits - Chip-select generation - Data routing and selection - LED control circuits - Multiplexing and demultiplexing systems - Microcontroller interfacing - Arduino and educational electronics projects Basic Pin Connection VCC – Connect to +5V GND – Connect to GND A, B, C – Connect to the three binary select inputs G1, G2A, G2B – Enable/control inputs Y0–Y7 – Eight decoded outputs