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SN74ALS138A from TI,Texas Instruments

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SN74ALS138A

Manufacturer: TI

3-Line to 8-Line Decoders/Demultiplexers

Partnumber Manufacturer Quantity Availability
SN74ALS138A TI 2052 In Stock

Description and Introduction

3-Line to 8-Line Decoders/Demultiplexers The SN74ALS138A is a 3-line to 8-line decoder/demultiplexer manufactured by Texas Instruments.  

### **Specifications:**  
- **Supply Voltage Range (VCC):** 4.5V to 5.5V  
- **Input Voltage (VI):** 0V to VCC  
- **Operating Temperature Range:** 0°C to 70°C  
- **Propagation Delay (tpd):** Typically 12ns  
- **Power Dissipation (PD):** 80mW (max)  
- **Input Current (II):** ±0.1mA (max)  
- **Output Current (IO):** ±24mA (max)  

### **Descriptions:**  
- The SN74ALS138A is designed to accept three binary-coded inputs (A0, A1, A2) and generate eight mutually exclusive active-low outputs (Y0-Y7).  
- It includes three enable inputs (G1, G2A, G2B) for cascading and control.  
- When enabled, the selected output goes low based on the binary input combination.  

### **Features:**  
- **3-to-8 Line Decoding/Demultiplexing**  
- **Active-Low Outputs**  
- **Multiple Enable Inputs for Easy Expansion**  
- **Schottky-Clamped for High Performance**  
- **Compatible with TTL Inputs**  
- **Low Power Consumption**  

This device is commonly used in memory decoding, data routing, and logic function generation.  

Would you like additional details on pin configurations or truth tables?

Application Scenarios & Design Considerations

3-Line to 8-Line Decoders/Demultiplexers

Alternative Part Number

  • MC74ACT138 --: 3-to-8 line decoder/demultiplexer with active-low outputs, functionally equivalent to the SN74ALS138A and widely available.
  • CD74HCT138E --: HCT-series 3-to-8 decoder with TTL-compatible inputs, direct functional replacement in the same logic family class.
  • 74HC138 --: Standard 3-to-8 line decoder/demultiplexer with active-low outputs, pin-compatible and suitable for most ALS138A applications.
  • 74ALS138 --: Same 3-to-8 line decoder/demultiplexer function in the ALS logic family, pin-compatible with the SN74ALS138A.
  • CD74HCT138 --: Pin-compatible 3-to-8 decoder/demultiplexer from a different logic family (HCT) with TTL-compatible inputs, suitable as a drop-in replacement in most designs.

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