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SN74LS645NSR from TI,Texas Instruments

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SN74LS645NSR

Manufacturer: TI

Octal bus transceivers

Partnumber Manufacturer Quantity Availability
SN74LS645NSR TI 2168 In Stock

Description and Introduction

Octal bus transceivers The SN74LS645NSR is a 3-state octal bus transceiver manufactured by Texas Instruments (TI). Here are its specifications, descriptions, and features:

### **Specifications:**  
- **Technology Family:** LS  
- **Supply Voltage (VCC):** 4.75V to 5.25V  
- **Operating Temperature Range:** 0°C to 70°C  
- **Package Type:** SOIC (NSR)  
- **Number of Pins:** 20  
- **Data Rate:** Standard LS speed  
- **Logic Type:** Transceiver, Non-Inverting  
- **Output Type:** 3-State  

### **Descriptions:**  
- The SN74LS645NSR is an octal bus transceiver designed for bidirectional asynchronous communication between data buses.  
- It features separate control inputs for enabling data flow in either direction (A to B or B to A).  
- The outputs are in a high-impedance state when disabled, allowing multiple devices to share a common bus.  

### **Features:**  
- **Bidirectional Data Flow:** Controlled by DIR (Direction) input.  
- **Output Enable (OE) Input:** Disables outputs when high, placing them in a high-impedance state.  
- **Non-Inverting Data Paths:** Ensures data integrity without inversion.  
- **Wide Operating Voltage:** Compatible with standard TTL levels.  
- **High-Impedance State:** Prevents bus contention.  
- **Standard Pinout:** Conforms to industry-standard LS logic family pin configurations.  

This device is commonly used in data transmission systems, microprocessor interfaces, and bus-oriented applications.

Application Scenarios & Design Considerations

Octal bus transceivers

Alternative Part Number

  • DM74LS645N --: Same octal bus transceiver function with LS TTL logic, DIP package, direct functional equivalent from a different series.
  • MC74LS645N --: Pin-compatible octal bus transceiver in LS logic family, suitable drop-in replacement for the SN74LS645NSR.
  • SN74LS245N --: Similar octal bus transceiver with 3-state outputs in LS family; check pinout and drive differences before substitution.

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