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| Product attributes | Property Value |
| Manufacturer | National Semiconductor |
| Product Series | 54LS |
| Packaging | | |
| Part Status | Active |
| Logic Type | Buffer, Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 4 |
| Input Type | - |
| Output Type | 3-State |
| Current - Output High, Low | 12mA, 12mA |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -55°C ~ 125°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-CFlatPack |
| Supplier Device Package | 20-CFlatPack |
The 54LS240FMQB is a dual inverting buffer from National Semiconductor's 54LS family, designed for military and aerospace applications. Operating from 4.5V to 5.5V, it features 3-State outputs and 12mA drive capability per channel. Packaged in a hermetic 20-CFlatPack, it operates from -55°C to 125°C, ensuring reliability in extreme environments. This buffer is ideal for data bus interfacing, signal inversion, and high-reliability control systems.
- Military Temperature Range (-55°C to 125°C): Guarantees operation in extreme aerospace environments.
- Hermetic CFlatPack Package: Provides superior protection against moisture and contaminants.
- High Drive Current (12mA): Drives long cables and heavy capacitive loads in test equipment.
- 3-State Outputs: Enables safe bus sharing in redundant systems.
Military Avionics Data Buses
The 54LS family is qualified for military temperature ranges (-55°C to 125°C), making it suitable for flight control computers buffering MIL-STD-1553 data lines.
Space-Grade Telemetry Systems
Hermetic CFlatPack packaging provides protection against outgassing and radiation, ideal for satellite telemetry interfaces.
High-Reliability Industrial Controls
Use in nuclear power plant control systems where extended temperature and radiation tolerance are mandatory.
Legacy Military Communication Equipment
Buffer inverting signals in tactical radios, maintaining compatibility with existing 5V LS logic infrastructure.
Redundant Bus Architectures
3-State outputs enable bus isolation in redundant flight systems, allowing failover without signal contention.
Test and Measurement for Defense
In ATE (Automated Test Equipment), buffer control signals with high drive current (12mA) for long cable runs.
- Q: What logic family is the 54LS240FMQB?
- A: It belongs to the 54LS (Low-power Schottky) family, a military-grade logic series.
- Q: What is the function and channel count?
- A: It is a dual (2-channel) inverting buffer with 3-State outputs.
- Q: What is the supply voltage range?
- A: It operates from 4.5V to 5.5V, standard for 5V logic.
- Q: What is the output type?
- A: 3-State outputs allow connection to shared buses.
- Q: What package is available?
- A: It comes in a 20-CFlatPack, a hermetic military-grade package.
- Q: What is the output current?
- A: It can source and sink 12mA per channel.
54LS240FMQB.pdf
- Q: What logic family is the 54LS240FMQB?
- A: It belongs to the 54LS (Low-power Schottky) family, a military-grade logic series.
- Q: What is the function and channel count?
- A: It is a dual (2-channel) inverting buffer with 3-State outputs.
- Q: What is the supply voltage range?
- A: It operates from 4.5V to 5.5V, standard for 5V logic.
- Q: What is the output type?
- A: 3-State outputs allow connection to shared buses.
- Q: What package is available?
- A: It comes in a 20-CFlatPack, a hermetic military-grade package.
- Q: What is the output current?
- A: It can source and sink 12mA per channel.