Texas Instruments SN74LS645-1N
| 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, 48mA |
| 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 SN74LS645-1N is a classic octal bus transceiver from Texas Instruments, part of the 74LS Low-Power Schottky family. It provides 8-bit bidirectional data transfer with non-inverting outputs and 3-state control, making it ideal for bus-oriented systems. The device operates from a standard 5V supply (4.75V to 5.25V) and features a high sink current of 48mA, ensuring robust drive capability. Housed in a 20-pin DIP package, it is easy to integrate into through-hole PCB designs. This transceiver is well-suited for microprocessor systems, industrial controls, and educational projects where reliable 5V logic interfacing is required.
- High 48mA Sink Current: Provides strong drive for heavy loads, ensuring signal integrity on long bus lines.
- 3-State Outputs: Enables multiple devices to share a common bus without data corruption.
- Non-Inverting Logic: Simplifies design by maintaining signal polarity, reducing debugging effort.
- Standard 5V Operation: Compatible with legacy TTL systems, making it a drop-in replacement for older designs.
- DIP Package: Easy to handle, solder, and replace, ideal for prototyping and maintenance.
Legacy 5V Bus Interfacing
Use the SN74LS645-1N to interface between two 5V TTL logic buses in legacy industrial equipment. The 3-state outputs and direction control allow for efficient bidirectional data transfer without bus contention.
Microprocessor to Memory Communication
In retro or simple embedded systems, buffer the data bus between a microprocessor and memory devices. The high output current (48mA) ensures reliable signal drive to multiple memory chips.
Test and Measurement Equipment
In bench-top instruments, use this transceiver to route signals between different internal modules. The DIP package is easy to prototype and service, making it ideal for low-volume or maintenance-friendly designs.
Peripheral Device Control
Drive and isolate peripheral devices like printers or external I/O cards. The 3-state outputs allow the system to disconnect the peripheral when not in use, reducing power consumption.
Educational and Hobbyist Projects
For learning digital logic or building custom 5V systems, this DIP transceiver is a practical choice. Its robust design and wide availability make it a staple in university labs and maker spaces.
Industrial Control Panels
In PLCs and industrial controllers, buffer signals between the main logic board and field I/O connectors. The 0°C to 70°C temperature range covers typical indoor control cabinet environments.
- Q: What logic family is the SN74LS645-1N?
- A: It belongs to the 74LS (Low-Power Schottky) logic family, offering a balance of speed and power consumption.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) bus transceiver with non-inverting outputs, designed for bidirectional data flow.
- Q: How many channels does it have?
- A: It has 1 channel with 8 bits, providing a single 8-bit bidirectional data path.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for high-impedance states to enable 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.
SN74LS645-1N.pdf
- Q: What logic family is the SN74LS645-1N?
- A: It belongs to the 74LS (Low-Power Schottky) logic family, offering a balance of speed and power consumption.
- Q: What is the function of this IC?
- A: It is an octal (8-bit) bus transceiver with non-inverting outputs, designed for bidirectional data flow.
- Q: How many channels does it have?
- A: It has 1 channel with 8 bits, providing a single 8-bit bidirectional data path.
- Q: What is the output type?
- A: The outputs are 3-State, allowing for high-impedance states to enable 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.
