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SN74HC138 from TOS,TOSHIBA

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SN74HC138

Manufacturer: TOS, TEXAS, TI

3-Line To 8-Line Decoders/Demultiplexers

Partnumber Manufacturer Quantity Availability
SN74HC138 TOS, TEXAS, TI 2790 In Stock

Description and Introduction

3-Line To 8-Line Decoders/Demultiplexers The SN74HC138 is a 3-to-8 line decoder/demultiplexer manufactured by Texas Instruments (TI), not TOS. Here are its specifications, descriptions, and features:

### **Specifications:**  
- **Supply Voltage Range (VCC):** 2V to 6V  
- **High-Level Input Voltage (VIH):** 2V (min) at VCC = 4.5V  
- **Low-Level Input Voltage (VIL):** 0.8V (max) at VCC = 4.5V  
- **High-Level Output Current (IOH):** -5.2mA at VCC = 4.5V  
- **Low-Level Output Current (IOL):** 5.2mA at VCC = 4.5V  
- **Operating Temperature Range:** -40°C to +85°C  
- **Propagation Delay:** 15ns (typical) at VCC = 4.5V  

### **Description:**  
The SN74HC138 is a high-speed CMOS logic device that decodes three binary address inputs (A0, A1, A2) into one of eight mutually exclusive outputs (Y0–Y7). It features three enable inputs (two active LOW and one active HIGH) for cascading and demultiplexing applications.  

### **Features:**  
- **3-to-8 Line Decoding:** Converts 3-bit binary inputs to 8 active-LOW outputs.  
- **Demultiplexing Capability:** Can function as a 1-to-8 demultiplexer with the address inputs as control signals.  
- **Multiple Enable Inputs:** Includes two active-LOW (G2A, G2B) and one active-HIGH (G1) enable pins for flexible control.  
- **Low Power Consumption:** CMOS technology ensures minimal power dissipation.  
- **Wide Operating Voltage:** Supports 2V to 6V operation.  
- **High Noise Immunity:** Typical of HC logic family.  

Note: If referring to a TOS-branded equivalent, verify exact part number and specifications from Toshiba or another manufacturer.

Application Scenarios & Design Considerations

3-Line To 8-Line Decoders/Demultiplexers

Alternative Part Number

  • CD74HC138E --: Pin-compatible 3-to-8 line decoder/demultiplexer in the same HC logic family with equivalent function and drive characteristics.
  • MC74HC138ADG --: Direct functional equivalent 3-to-8 decoder with identical pinout and HC CMOS logic levels, widely available.
  • 74HC138D --: Standard 3-to-8 decoder/demultiplexer in SO package with matching logic function and compatible electrical specifications.

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