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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74LS |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Transceiver, Non-Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Input Type | - |
| Output Type | 3-State |
| Current - Output High, Low | 15mA, 24mA |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 20-DIP (0.300", 7.62mm) |
| Supplier Device Package | 20-PDIP |
The SN74LS645N3 from Texas Instruments is a non-inverting transceiver from the 74LS logic family. It features 1 channel with a 3-State output, operating at a standard 5V supply range of 4.75V to 5.25V. With a robust output current capability of 15mA and 24mA, it can drive significant loads. This transceiver is ideal for bidirectional bus communication in legacy 5V TTL systems. It is available in a 20-DIP package, making it suitable for through-hole mounting and prototyping. It operates over a commercial temperature range of 0°C to 70°C.
- Bidirectional Transceiver: Allows data flow in both directions, reducing component count in bus systems.
- High Output Drive (15mA/24mA): Ensures reliable signal transmission over longer distances and heavier loads.
- Standard 5V TTL Compatibility: Easily interfaces with existing 5V logic systems.
- Through-Hole DIP Package: Ideal for prototyping, breadboarding, and educational use.
Bidirectional Bus Communication
Use the SN74LS645N3 for bidirectional data transfer between two buses in 5V TTL systems. The 3-State outputs allow for direction control and bus isolation.
Legacy 5V System Interfacing
In older industrial equipment, this transceiver interfaces between different 5V logic subsystems, ensuring compatibility with existing TTL designs.
Memory Data Bus Buffering
Use it to buffer the data bus between a CPU and memory. The bidirectional capability allows for both read and write operations.
Peripheral Device Communication
In computer systems, this transceiver connects the CPU to peripheral devices like printers or modems, providing the necessary drive strength.
Prototyping and Education
Due to its DIP package, it is ideal for breadboard prototyping and educational labs teaching TTL logic design.
Test and Measurement Equipment
In bench instruments, this transceiver routes signals between different modules, providing reliable bidirectional communication.
- Q: What is the logic family of the SN74LS645N3?
- A: It belongs to the 74LS family, which is a classic low-power Schottky TTL logic family.
- Q: What is the function of this IC?
- A: It is a non-inverting transceiver with 1 channel, allowing bidirectional data flow.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, making it suitable for standard 5V TTL systems.
- Q: What is the output type?
- A: The output is 3-State, enabling bidirectional bus communication.
- Q: What is the package type?
- A: It comes in a 20-DIP (0.300", 7.62mm Width) package, which is through-hole mountable.
- Q: What is the operating temperature range?
- A: It operates from 0°C to 70°C, suitable for commercial applications.
SN74LS645N3.pdf
- Q: What is the logic family of the SN74LS645N3?
- A: It belongs to the 74LS family, which is a classic low-power Schottky TTL logic family.
- Q: What is the function of this IC?
- A: It is a non-inverting transceiver with 1 channel, allowing bidirectional data flow.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, making it suitable for standard 5V TTL systems.
- Q: What is the output type?
- A: The output is 3-State, enabling bidirectional bus communication.
- Q: What is the package type?
- A: It comes in a 20-DIP (0.300", 7.62mm Width) package, which is through-hole mountable.
- Q: What is the operating temperature range?
- A: It operates from 0°C to 70°C, suitable for commercial applications.