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SN74LS155N

DUAL 1-OF-4 DECODER/ DEMULTIPLEXER

Partnumber Manufacturer Quantity Availability
SN74LS155N 1 In Stock

Description and Introduction

DUAL 1-OF-4 DECODER/ DEMULTIPLEXER The SN74LS155N is a dual 2-line to 4-line decoder/demultiplexer integrated circuit manufactured by Texas Instruments.  

### **Key Specifications:**  
- **Logic Family:** 74LS  
- **Function:** Dual 2-to-4 Line Decoder/Demultiplexer  
- **Operating Voltage:** 4.75V to 5.25V (TTL compatible)  
- **Propagation Delay:** Typically 15ns  
- **Output Current (High):** -0.4mA  
- **Output Current (Low):** 8mA  
- **Operating Temperature Range:** 0°C to 70°C  
- **Package:** 16-pin DIP (Dual In-line Package)  

### **Description:**  
The SN74LS155N contains two independent 2-to-4 line decoders/demultiplexers. Each decoder has two select inputs (A and B), an active-low enable input (G), and four active-low outputs (Y0 to Y3).  

### **Features:**  
- **Dual Decoder/Demultiplexer:** Two separate 2-to-4 decoders in one IC.  
- **Active-Low Outputs:** Outputs are low when selected.  
- **Enable Input:** Each decoder has an enable pin for control.  
- **TTL Compatibility:** Works with standard TTL logic levels.  
- **Wide Operating Voltage:** Supports standard 5V logic.  

This IC is commonly used in digital systems for address decoding, data routing, and signal demultiplexing.

Application Scenarios & Design Considerations

DUAL 1-OF-4 DECODER/ DEMULTIPLEXER

Alternative Part Number

  • 74LS155N --: Same dual 2-to-4 line decoder/demultiplexer function with active-low outputs, pin-compatible DIP-16 package, and widely available as a direct functional equivalent.
  • MC74LS155N --: Second-source 74LS155 decoder/demultiplexer in DIP-16, electrically and functionally equivalent to the original with the same pinout.
  • SN74LS156N --: Same dual 2-to-4 decoder family with open-collector outputs instead of totem-pole; usable as a substitute when open-collector drive is acceptable, same package and pinout.

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