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| Product attributes | Property Value |
| Manufacturer | Fairchild Semiconductor |
| Product Series | 74AC |
| Packaging | | |
| Part Status | Active |
| Logic Type | Buffer, Inverting |
| Number of Elements | 1 |
| Number of Bits per Element | 8 |
| Input Type | - |
| Output Type | 3-State |
| Current - Output High, Low | 24mA, 24mA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.295", 7.50mm Width) |
| Supplier Device Package | 20-SOIC |
| ROHS |  |
The 74AC540SC is a high-speed inverting buffer from Fairchild Semiconductor, designed for general-purpose digital logic applications. Operating from 2V to 6V, it provides a single channel with 3-State outputs capable of sourcing and sinking 24mA. This buffer is ideal for bus interfacing, signal inversion, and driving capacitive loads in both 3.3V and 5V systems. Its 20-SOIC package makes it suitable for space-constrained PCB designs.
- Wide 2V to 6V Supply Range: Compatible with both 3.3V and 5V logic systems, simplifying mixed-voltage designs.
- 3-State Outputs: Enables bus sharing and multiplexing without external isolation components.
- High 24mA Output Drive: Can drive heavy loads and long traces, improving signal integrity.
- Inverting Function: Provides signal inversion, useful for active-low control and data lines.
Bus Interfacing and Isolation
Use the 74AC540SC to buffer address or data lines between different logic sections. The 3-State outputs allow multiple devices to share a common bus without contention, controlled by an output enable signal.
Signal Inversion and Level Shifting
With a wide 2V to 6V supply range, this buffer can act as a level shifter between 3.3V and 5V logic. The inverting function is useful for active-low control signals.
Driving High-Capacitance Loads
The 24mA output current capability enables driving long PCB traces or multiple inputs, reducing signal degradation and improving noise immunity in high-speed digital systems.
Memory Address Buffering
In microcontroller or processor systems, this buffer can isolate the CPU from memory arrays, providing the necessary drive strength and preventing loading effects on the processor outputs.
Industrial Control Logic
In industrial environments, the 74AC540SC can buffer sensor signals or control lines, providing robust signal conditioning and isolation between control logic and power stages.
Test and Measurement Equipment
Use it to buffer and invert signals in test fixtures or data acquisition systems, ensuring accurate signal integrity when routing signals to different measurement modules.
- Q: What is the logic family of the 74AC540SC?
- A: The 74AC540SC belongs to the 74AC logic family, offering high-speed CMOS performance.
- Q: What is the function of this IC?
- A: It is an inverting buffer with 1 channel, providing signal inversion and buffering.
- Q: What is the output type?
- A: It features 3-State outputs, allowing connection to shared buses.
- Q: What is the supply voltage range?
- A: It operates from 2V to 6V, making it compatible with 3.3V and 5V systems.
- Q: What is the output current capability?
- A: It can source and sink 24mA, suitable for driving moderate loads.
- Q: What package is available?
- A: It comes in a 20-SOIC (0.295", 7.50mm Width) package.
74AC540SC.pdf
- Q: What is the logic family of the 74AC540SC?
- A: The 74AC540SC belongs to the 74AC logic family, offering high-speed CMOS performance.
- Q: What is the function of this IC?
- A: It is an inverting buffer with 1 channel, providing signal inversion and buffering.
- Q: What is the output type?
- A: It features 3-State outputs, allowing connection to shared buses.
- Q: What is the supply voltage range?
- A: It operates from 2V to 6V, making it compatible with 3.3V and 5V systems.
- Q: What is the output current capability?
- A: It can source and sink 24mA, suitable for driving moderate loads.
- Q: What package is available?
- A: It comes in a 20-SOIC (0.295", 7.50mm Width) package.