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| Product attributes | Property Value |
| Manufacturer | onsemi |
| Product Series | 74LS |
| Packaging | Bulk | |
| 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 | 15mA, 24mA |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | 0°C ~ 70°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | SOEIAJ-20 |
| ROHS |  |
The SN74LS240M from onsemi is a dual inverting buffer belonging to the 74LS logic family. It operates from 4.75V to 5.25V and features 3-State outputs with 15mA sink and 24mA source capability. The 20-SOIC package is industry-standard. With a temperature range of 0°C to 70°C, it is designed for commercial applications requiring signal inversion and bus buffering.
- High Output Drive (15mA/24mA): Can drive LEDs, relays, and long traces without additional buffers.
- 3-State Outputs: Enables bus sharing and multiplexing, reducing component count.
- 74LS Family Reliability: Proven technology with predictable performance in 5V systems.
- Inverting Function: Useful for active-low logic, simplifying circuit design.
Inverting Bus Drivers in Legacy Systems
The SN74LS240M is ideal for legacy 5V TTL systems where signal inversion is required. Its 3-State outputs allow multiple drivers to share a bus, making it a staple in older computer and peripheral designs.
LED Display Multiplexing
The high sink current (15mA) makes this buffer suitable for driving LED segments in multiplexed displays. The inverting function simplifies active-low display logic, reducing the need for additional inverters.
Memory Address Buffering
In retro computing or industrial controllers, this buffer can drive address lines to memory chips. The 3-State feature allows memory to be isolated during refresh cycles or when other devices access the bus.
Signal Inversion in Control Logic
When a control signal needs to be inverted, this buffer provides a clean solution. The 3-State outputs enable tri-stating the signal during system reset, preventing false triggering of actuators.
Interfacing 5V Logic to Peripheral Devices
Many legacy peripherals operate at 5V. This buffer ensures proper signal levels and drive strength for reliable communication with printers, modems, or industrial sensors.
Prototyping and Education
Due to its simple interface and robust nature, this IC is excellent for educational labs and prototyping. Its inverting function helps students understand logic inversion and bus contention concepts.
- Q: What logic family does the SN74LS240M belong to?
- A: It is part of the 74LS (Low-Power Schottky) family, known for its balance of speed and power consumption.
- Q: What is the function of this IC?
- A: It is a dual (2-channel) inverting buffer with 3-State outputs, used for signal inversion and bus driving.
- Q: What is the output current capability?
- A: It can sink 15mA and source 24mA, providing robust drive for various loads.
- Q: What is the supply voltage range?
- A: It operates from 4.75V to 5.25V, making it suitable for standard 5V TTL systems.
- Q: What package is available?
- A: It comes in a 20-SOIC package, which is widely used and easy to solder.
- Q: What is the temperature range?
- A: It operates from 0°C to 70°C, suitable for commercial applications.
SN74LS240M.pdf
- Q: What logic family does the SN74LS240M belong to?
- A: It is part of the 74LS (Low-Power Schottky) family, known for its balance of speed and power consumption.
- Q: What is the function of this IC?
- A: It is a dual (2-channel) inverting buffer with 3-State outputs, used for signal inversion and bus driving.
- Q: What is the output current capability?
- A: It can sink 15mA and source 24mA, providing robust drive for various loads.
- Q: What is the supply voltage range?
- A: It operates from 4.75V to 5.25V, making it suitable for standard 5V TTL systems.
- Q: What package is available?
- A: It comes in a 20-SOIC package, which is widely used and easy to solder.
- Q: What is the temperature range?
- A: It operates from 0°C to 70°C, suitable for commercial applications.