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| Product attributes | Property Value |
| Manufacturer | Harris Corporation |
| Product Series | 74AC |
| Packaging | Bulk | |
| Part Status | Active |
| Logic Type | Buffer, Inverting |
| Number of Elements | 2 |
| Number of Bits per Element | 8 |
| Input Type | - |
| Output Type | 3-State |
| Current - Output High, Low | 75mA, 75mA |
| Voltage - Supply | 1.5V ~ 5.5V |
| Operating Temperature | -55°C ~ 125°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Through Hole |
| Package / Case | 20-DIP (0.300", 7.62mm) |
| Supplier Device Package | 20-PDIP |
The CD74AC540E is a high-speed octal inverting buffer from Harris Corporation, featuring 3-State outputs and a wide operating voltage range of 1.5V to 5.5V. With a robust 75mA output drive capability, it is well-suited for bus interfacing, signal buffering, and level shifting in industrial controls, display systems, and mixed-voltage digital circuits. Its 20-DIP package allows for easy prototyping and through-hole assembly.
- Very Wide 1.5V to 5.5V Supply Range: Supports everything from low-voltage portable designs to legacy 5V systems.
- High 75mA Output Drive: Can drive heavy loads like LED displays and long bus lines without additional buffers.
- 3-State Outputs: Enables multiple devices to share a common data bus safely.
- Extended Temperature Range: Operates from -55°C to 125°C, suitable for harsh industrial and military environments.
Bus Driving in Mixed-Voltage Systems
The wide 1.5V to 5.5V supply range and 3-State outputs make it ideal for driving buses in systems that mix 3.3V and 5V logic.
Signal Inversion and Buffering in Digital Circuits
With 75mA output drive, it can buffer and invert signals for high-capacitance loads, ensuring clean logic levels in complex digital designs.
Level Shifting for Legacy 5V Peripherals
Its ability to operate at 5V while accepting inputs from lower-voltage logic allows it to shift signals up to 5V for legacy peripherals.
High-Drive LED and Display Interfaces
The 75mA output current can directly drive LED arrays or segmented displays, reducing the need for external driver ICs.
Industrial Control Logic Isolation
In industrial environments, it can buffer control signals between PLCs and field devices, providing robust signal integrity over long cable runs.
Memory and Address Line Buffering
In retro or custom computing systems, it can buffer address and data lines, reducing loading on the CPU and improving system stability.
- Q: What is the logic family of the CD74AC540E?
- A: It belongs to the 74AC (Advanced CMOS) logic family, offering high speed and low power consumption.
- Q: What is the function of this IC?
- A: It is an octal buffer with inverting outputs, used for signal buffering and line driving.
- Q: How many channels does it have?
- A: It has 2 channels, each handling 4 bits, for a total of 8 inverting buffers.
- Q: What type of output does it feature?
- A: It features 3-State outputs, enabling bus-oriented applications.
- Q: What is the operating voltage range?
- A: It operates from 1.5V to 5.5V, supporting a wide range of logic levels.
- Q: What package is available?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.
CD74AC540E.pdf
- Q: What is the logic family of the CD74AC540E?
- A: It belongs to the 74AC (Advanced CMOS) logic family, offering high speed and low power consumption.
- Q: What is the function of this IC?
- A: It is an octal buffer with inverting outputs, used for signal buffering and line driving.
- Q: How many channels does it have?
- A: It has 2 channels, each handling 4 bits, for a total of 8 inverting buffers.
- Q: What type of output does it feature?
- A: It features 3-State outputs, enabling bus-oriented applications.
- Q: What is the operating voltage range?
- A: It operates from 1.5V to 5.5V, supporting a wide range of logic levels.
- Q: What package is available?
- A: It comes in a 20-DIP (0.300", 7.62mm) package, suitable for through-hole mounting.