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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Transceiver, Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Input Type | - |
| Output Type | Open Collector |
| Current - Output High, Low | 100µA, 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-DIP (0.300", 7.62mm) |
The SN74LS644-1N3 is a 1-channel inverting transceiver from Texas Instruments, part of the 74LS logic family. It operates from 4.75V to 5.25V, making it ideal for traditional 5V TTL systems. The open collector outputs allow for wired-OR configurations and level shifting with external pull-up resistors. It can sink 24mA, providing adequate drive for TTL loads. Housed in a 20-DIP package, it is easy to prototype and integrate into through-hole designs. This transceiver is well-suited for bidirectional data buses and industrial control applications.
- Open Collector Outputs: Enables wired-OR logic and flexible level shifting to higher voltages.
- Bidirectional Transceiver: Allows data flow in both directions, reducing component count.
- Standard 5V Operation: Compatible with legacy TTL systems, simplifying integration.
- Through-Hole DIP Package: Easy to solder and replace in existing designs.
- Inverting Function: Useful for logic inversion where needed in the signal path.
5V TTL Bus Transceivers
This inverting transceiver with open collector outputs is ideal for bidirectional data buses in legacy 5V TTL systems, allowing data flow in both directions.
Wired-OR Logic
Open collector outputs enable wired-OR connections, allowing multiple outputs to share a common line without damage, useful in interrupt and status lines.
Level Shifting to Higher Voltages
With external pull-up resistors, the open collector outputs can shift signals to higher voltages (e.g., 12V or 24V) for industrial loads.
Peripheral Interface
Used to interface microprocessors with peripherals like printers and modems, providing bidirectional data transfer and signal inversion.
Industrial Control Panels
In 5V control systems, it buffers and inverts signals between PLCs and relay drivers, operating reliably from 0°C to 70°C.
Test Equipment
In benchtop instruments, it provides a simple way to create bidirectional data paths with open collector outputs for external logic analyzers.
- Q: What is the logic family of the SN74LS644-1N3?
- A: It belongs to the 74LS (Low-power Schottky) family, known for its balance of speed and power.
- Q: What is the function of this IC?
- A: It is a 1-channel inverting transceiver, capable of bidirectional data transfer.
- Q: What is the output type?
- A: It features Open Collector outputs, requiring external pull-up resistors for proper operation.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, making it compatible with standard 5V TTL systems.
- Q: What is the package type?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.
- Q: What is the output current capability?
- A: It can sink 24mA, while the input leakage is 100µA, suitable for driving TTL loads.
SN74LS644-1N3.pdf
- Q: What is the logic family of the SN74LS644-1N3?
- A: It belongs to the 74LS (Low-power Schottky) family, known for its balance of speed and power.
- Q: What is the function of this IC?
- A: It is a 1-channel inverting transceiver, capable of bidirectional data transfer.
- Q: What is the output type?
- A: It features Open Collector outputs, requiring external pull-up resistors for proper operation.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, making it compatible with standard 5V TTL systems.
- Q: What is the package type?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.
- Q: What is the output current capability?
- A: It can sink 24mA, while the input leakage is 100µA, suitable for driving TTL loads.