Dual 2:4 Dec/DeMux 74155

The Dual 2:4 Dec/DeMux 74155 is a 74-series logic IC with two 2-to-4 line decoders/demultiplexers that share the same two select inputs. When enabled, each section pulls one of its four active-LOW outputs low according to the binary code on the A and B inputs, and the two sections can be combined into a single 3-to-8 line decoder. It is used for address decoding, routing data to one of several lines and digital logic lab work.

Dual 2:4 Dec/DeMux 74155 Specifications

• Function: 2 × 2-to-4 line decoder/demultiplexer
• Select inputs: A and B, common to both sections
• Section 1 controls: data input 1C (active HIGH) and strobe 1G (active LOW)
• Section 2 controls: data input 2C (active LOW) and strobe 2G (active LOW)
• Outputs: 1Y0–1Y3 and 2Y0–2Y3, active LOW
• Supply voltage: 5 V
• Package: 16-pin DIP

Dual 2:4 Dec/DeMux 74155 Applications

• Address decoding for memory and I/O chips
• 3-to-8 line decoding with a single chip
• Demultiplexing one data line to four outputs
• Selecting LEDs, displays or devices from a few microcontroller pins
• Digital logic labs and university electronics courses

What's in the Box

• 1 × 74155 dual 2-to-4 decoder/demultiplexer IC

Tip: To use it as a 3-to-8 decoder, join 1C and 2C as the third select input (C) and join 1G and 2G as the enable: outputs 2Y0–2Y3 then cover codes 0–3 and 1Y0–1Y3 cover codes 4–7. Place a 100 nF capacitor between VCC and GND close to the chip.

Orders placed before 14:00 are ready for pickup the same day. Delivery across Lebanon usually takes 1–3 working days.