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SN74LS138DR2 from MOT MC74LS138DR2,Motorola

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SN74LS138DR2

Manufacturer: MOT MC74LS138DR2, MOT

1-OF-8 Decoder/ Demultiplexer

Partnumber Manufacturer Quantity Availability
SN74LS138DR2 MOT MC74LS138DR2, MOT 2079 In Stock

Description and Introduction

1-OF-8 Decoder/ Demultiplexer The SN74LS138DR2 is a 3-to-8 line decoder/demultiplexer manufactured by Motorola (MOT).  

### **Specifications:**  
- **Logic Type:** Decoder/Demultiplexer  
- **Number of Input Lines:** 3  
- **Number of Output Lines:** 8 (active-low)  
- **Supply Voltage Range:** 4.75V to 5.25V  
- **Operating Temperature Range:** 0°C to 70°C  
- **Package Type:** SOIC-16  
- **Propagation Delay Time:** Typically 21ns  
- **Current - Output High, Low:** 400µA, 8mA  
- **Mounting Type:** Surface Mount  

### **Descriptions:**  
The SN74LS138DR2 is designed to accept three binary-weighted inputs (A0, A1, A2) and provide eight mutually exclusive active-low outputs (Y0-Y7). It includes three enable inputs (two active-low and one active-high) for cascading and control.  

### **Features:**  
- **3-to-8 Line Decoding:** Converts 3-bit binary input into one of eight outputs.  
- **Demultiplexing Capability:** Can function as a 1-to-8 demultiplexer.  
- **Active-Low Outputs:** Outputs are low when selected.  
- **Enable Inputs:** G1 (active-high), G2A and G2B (active-low) for chip control.  
- **TTL-Compatible:** Works with standard TTL logic levels.  
- **Low Power Consumption:** Optimized for power efficiency.  

This information is based solely on the device's technical specifications and features.

Application Scenarios & Design Considerations

1-OF-8 Decoder/ Demultiplexer

Alternative Part Number

  • DM74LS138N --: Same 3-to-8 line decoder/demultiplexer function in the 74LS logic family, widely available and pin-compatible in DIP form.
  • CD74HC138E --: High-speed CMOS 3-to-8 decoder with equivalent logic function and pinout, suitable drop-in replacement where LS speed is not critical.
  • MC74HC138ADG --: CMOS 3-to-8 decoder from a different series with matching function and pinout, offering lower power consumption than the original LS device.
  • 74LS138D --: Same 3-to-8 line decoder/demultiplexer function in SOIC-16 package, widely available and pin-compatible replacement.
  • MC74LS138DR2 --: Direct functional equivalent decoder with identical LS TTL logic and SOIC-16 footprint from a major second source.
  • SN74LS138N --: Same decoder function and logic family in a DIP-16 package, suitable when through-hole mounting is acceptable.

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