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SN74LS240 from TI,Texas Instruments

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SN74LS240

Manufacturer: TI

Octal Buffer/Line Driver with 3-State Outputs

Partnumber Manufacturer Quantity Availability
SN74LS240 TI 7140 In Stock

Description and Introduction

Octal Buffer/Line Driver with 3-State Outputs The SN74LS240 is a part of the 74LS series of integrated circuits manufactured by Texas Instruments.  

### **Manufacturer:**  
Texas Instruments  

### **Specifications:**  
- **Logic Family:** 74LS (Low-Power Schottky)  
- **Function:** Octal Buffer/Line Driver with 3-State Outputs  
- **Number of Channels:** 8 (Octal)  
- **Output Type:** 3-State (High, Low, High-Impedance)  
- **Polarity:** Inverting  
- **Supply Voltage (VCC):** 4.75V to 5.25V (Nominal 5V)  
- **Operating Temperature Range:** 0°C to 70°C (Commercial)  
- **Propagation Delay:** Typically 12 ns (Max 22 ns)  
- **Input Current (Max):** -0.36 mA (Low), 20 µA (High)  
- **Output Current (Max):** 24 mA (Sink), -15 mA (Source)  
- **Package Options:** 20-pin PDIP, SOIC, and other variants  

### **Descriptions:**  
The SN74LS240 is an octal buffer and line driver designed to provide high-speed, inverting signal buffering with 3-state outputs. It is commonly used in bus-oriented systems where multiple devices share a common data bus.  

### **Features:**  
- **Inverting Buffer/Driver:** Provides inverted outputs relative to inputs.  
- **3-State Outputs:** Allows outputs to be disabled (high-impedance state) for bus sharing.  
- **High Drive Capability:** Can drive up to 15 LS-TTL loads.  
- **Low Power Consumption:** Typical power dissipation of 80 mW.  
- **Schottky-Clamped Inputs:** Improves switching speed and reduces noise.  
- **Wide Operating Voltage:** Compatible with standard 5V TTL logic levels.  

This information is based on the manufacturer's datasheet and technical documentation.

Application Scenarios & Design Considerations

Octal Buffer/Line Driver with 3-State Outputs

Alternative Part Number

  • DM74LS240N --: Pin-compatible octal buffer/line driver with inverted outputs in the same LS logic family, widely available and a direct functional drop-in.
  • 74LS240PC --: Equivalent 74LS240 octal buffer with 3-state inverted outputs, same DIP pinout and electrical characteristics.
  • MC74LS240N --: Legacy LS240 octal buffer/line driver with identical function and pinout, suitable as a second-source replacement.

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