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| Product attributes | Property Value |
| Manufacturer | Texas Instruments |
| Product Series | 74LS |
| 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 | 24-DIP (0.300", 7.62mm) |
| Supplier Device Package | 24-PDIP |
The SN74LS649NT is a single-channel inverting transceiver from the 74LS logic family, designed for reliable 5V systems. It features open-collector outputs, allowing for wired-OR configurations and level shifting to higher voltages. Operating from 4.75V to 5.25V, it provides a sink current of 24mA and a low input current of 100µA. Housed in a 24-DIP package, this IC is ideal for industrial controls, legacy bus interfacing, and peripheral driving applications where robust, simple logic translation is required.
- Open-Collector Outputs: Enables wired-OR logic and allows output pull-up to higher voltages, providing design flexibility for mixed-voltage systems.
- High Sink Current (24mA): Can directly drive LEDs, relays, and other loads, reducing the need for external driver components.
- Wide 4.75V to 5.25V Supply Range: Compatible with standard 5V TTL logic, simplifying integration into existing designs.
- Inverting Transceiver Function: Provides signal inversion and bidirectional data flow in a single package, saving board space.
Industrial Control Interfaces
Use the SN74LS649NT to buffer and invert control signals between a 5V PLC and high-voltage industrial actuators. The open-collector output allows direct interfacing with relay coils or optocouplers, providing a robust solution for noisy factory environments.
Legacy Bus Systems
In legacy 5V microprocessor systems, this transceiver can drive a bidirectional data bus with inverting logic. The open-collector outputs enable wired-OR connections, allowing multiple devices to share a common bus line without contention.
Level Shifting to Higher Voltages
Because the output is open-collector, you can pull up the output to a higher voltage (e.g., 12V or 24V) using an external resistor. This makes it ideal for translating 5V logic signals to higher-voltage industrial logic levels.
Wired-OR Interrupt Lines
In microcontroller systems, multiple peripherals can share a single interrupt line using open-collector outputs. The SN74LS649NT's inverting transceiver function allows you to create an active-low wired-OR interrupt bus with proper pull-up resistors.
Memory Address Decoding
Use this transceiver to buffer and invert address lines in older 5V memory systems. The 24mA sink current capability ensures adequate drive for long PCB traces and multiple memory chips, maintaining signal integrity.
Peripheral Driver Circuits
The open-collector output can directly drive LEDs, small relays, or discrete transistors. With a current sink rating of 24mA, it can handle typical indicator loads without additional driver stages, simplifying board design.
- Q: What logic family does the SN74LS649NT belong to?
- A: It belongs to the 74LS (Low-power Schottky) logic family.
- Q: What is the function of this IC?
- A: It is a single-channel inverting transceiver with open-collector outputs.
- Q: How many channels does it have?
- A: It has 1 channel.
- Q: What is the output type?
- A: The output type is Open Collector.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V.
- Q: What package is available?
- A: It comes in a 24-DIP (0.300", 7.62mm) package.
SN74LS649NT.pdf
- Q: What logic family does the SN74LS649NT belong to?
- A: It belongs to the 74LS (Low-power Schottky) logic family.
- Q: What is the function of this IC?
- A: It is a single-channel inverting transceiver with open-collector outputs.
- Q: How many channels does it have?
- A: It has 1 channel.
- Q: What is the output type?
- A: The output type is Open Collector.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V.
- Q: What package is available?
- A: It comes in a 24-DIP (0.300", 7.62mm) package.