Texas Instruments SN74LS645N
| Quantity | Unit Price | Total Price |
|---|---|---|
| 1 | $2.53 | $2.53 |
| 15+ | $2.45 | $36.75 |
| 25+ | $2.39 | $59.75 |
| 50+ | $2.26 | $113.00 |
| 100+ | $2.00 | $200.00 |
| N+ | $0.40 | Price Inquiry |
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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74LS |
| Packaging | Tube | |
| 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 |
| ROHS |  |
The SN74LS645N is a reliable octal bus transceiver from Texas Instruments, part of the 74LS Low-Power Schottky family. It features 8-bit bidirectional data transfer with non-inverting outputs and 3-state control, making it a versatile component for 5V digital systems. The device operates from a 4.75V to 5.25V supply and offers a sink current of 24mA, suitable for driving standard TTL loads. Packaged in a 20-pin DIP, it is easy to integrate into through-hole PCBs. This transceiver is commonly used in microprocessor interfacing, industrial controls, and educational projects where robust 5V logic communication is essential.
- 3-State Outputs: Allows for safe bus sharing and isolation, preventing data corruption in multi-device systems.
- Non-Inverting Design: Maintains signal integrity and simplifies logic design.
- Standard 5V Operation: Compatible with a wide range of legacy and current 5V logic devices.
- DIP Package: Facilitates easy prototyping, soldering, and replacement in through-hole designs.
- Proven 74LS Technology: Offers a reliable, well-documented solution for digital interfacing.
5V Data Bus Buffering
Use the SN74LS645N to buffer a 5V data bus in microcontroller or microprocessor systems. The 3-state outputs prevent bus conflicts when multiple peripherals are connected.
Industrial Logic Level Conversion
In industrial control systems, this transceiver can interface between different 5V logic families (e.g., TTL and CMOS). The non-inverting outputs ensure correct signal polarity.
Memory Expansion
For expanding memory in legacy systems, buffer address and data lines to multiple memory banks. The 24mA sink current provides adequate drive for standard memory ICs.
Peripheral Isolation
Isolate a peripheral device from the main system bus using the output enable (OE) pin. This is useful for power management or hot-swapping capabilities.
Prototyping and Education
In university labs, this DIP transceiver is ideal for teaching bus architecture and 3-state logic. Its through-hole package is breadboard-friendly.
Automotive Aftermarket Electronics
For retrofitting older vehicles with new 5V logic modules, this IC provides a reliable interface between the existing wiring and new control units.
- Q: What logic family is the SN74LS645N?
- A: It belongs to the 74LS (Low-Power Schottky) logic family, known for its balance of speed and power efficiency.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) bus transceiver with non-inverting outputs, enabling bidirectional data transfer.
- Q: How many channels does it have?
- A: It has 1 channel with 8 bits, providing a single bidirectional data path.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for high-impedance states for bus sharing.
- Q: What is the voltage range?
- A: It operates at a standard 5V supply, specifically 4.75V to 5.25V.
- Q: What package is available?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.
SN74LS645N.pdf
- Q: What logic family is the SN74LS645N?
- A: It belongs to the 74LS (Low-Power Schottky) logic family, known for its balance of speed and power efficiency.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) bus transceiver with non-inverting outputs, enabling bidirectional data transfer.
- Q: How many channels does it have?
- A: It has 1 channel with 8 bits, providing a single bidirectional data path.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for high-impedance states for bus sharing.
- Q: What is the voltage range?
- A: It operates at a standard 5V supply, specifically 4.75V to 5.25V.
- Q: What package is available?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.
