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| Product attributes | Property Value |
| Manufacturer | IDT, Integrated Device Technology Inc |
| Product Series | 74FCT |
| Packaging | Bulk | |
| 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 | 15mA, 64mA |
| Voltage - Supply | 4.75V ~ 5.25V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-SSOP (0.154", 3.90mm Width) |
| Supplier Device Package | 20-QSOP |
| ROHS |  |
The 74FCT540ATQG is a high-speed inverting buffer from IDT, designed for 5V systems. It operates from 4.75V to 5.25V and provides 3-State outputs for bus-oriented applications. With 15mA source and 64mA sink current capability, it can drive heavy loads while maintaining signal integrity. The single-channel configuration is ideal for critical signal paths requiring inversion and buffering. Its 20-SSOP package is compact for space-constrained designs. Typical applications include memory buffering, bus isolation, and control signal inversion in industrial and automotive electronics.
- High Drive Current (64mA Sink): Drives heavy capacitive loads and relays directly, reducing need for external drivers.
- 3-State Outputs: Enables bus sharing and multiplexing without signal contention, simplifying system design.
- Wide Temperature Range (-40°C to 85°C): Suitable for harsh automotive and industrial environments.
- Compact SSOP Package: Saves PCB space while maintaining excellent thermal and electrical performance.
Bus Interfacing and Isolation
Use the 74FCT540ATQG to buffer and invert address or data lines between different logic blocks. The 3-State outputs allow multiple devices to share the same bus without contention, controlled by an output enable signal.
Signal Inversion in Control Systems
In industrial control systems, this buffer can invert logic signals while providing high drive current (64mA sink). This ensures reliable switching of relays or indicator lamps directly from logic outputs.
Memory Address Buffering
In microprocessor systems, the inverting buffer can drive high-capacitance memory address lines. The 15mA source capability ensures fast edge rates, reducing propagation delays in critical timing paths.
Level Shifting for 5V Logic
For systems mixing 5V logic with higher-voltage peripherals, the 74FCT540ATQG provides a robust 5V interface. Its 3-State feature allows safe disconnection during power sequencing or standby modes.
Automotive ECU Signal Conditioning
In automotive ECUs, this buffer operates over -40°C to 85°C, making it suitable for under-hood applications. It can buffer sensor signals with inversion where needed, ensuring clean logic levels to the microcontroller.
Test Equipment and Instrumentation
For bench test equipment, the 3-State output enables efficient multiplexing of multiple test points onto a single measurement bus. The inverting function simplifies logic analysis in complex digital circuits.
- Q: What is the logic family of the 74FCT540ATQG?
- A: It belongs to the 74FCT logic family, known for high speed and low power consumption.
- Q: What is the function of this IC?
- A: It is an inverting buffer with 3-State outputs, ideal for bus isolation and signal inversion.
- Q: How many channels does it have?
- A: It features 1 channel, providing a single inverting buffer path.
- Q: What is the output type?
- A: The outputs are 3-State, allowing connection to shared buses with high-impedance control.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, making it suitable for standard 5V systems.
- Q: What package is available?
- A: It comes in a 20-SSOP (0.154", 3.90mm Width) package.
74FCT540ATQG.pdf
- Q: What is the logic family of the 74FCT540ATQG?
- A: It belongs to the 74FCT logic family, known for high speed and low power consumption.
- Q: What is the function of this IC?
- A: It is an inverting buffer with 3-State outputs, ideal for bus isolation and signal inversion.
- Q: How many channels does it have?
- A: It features 1 channel, providing a single inverting buffer path.
- Q: What is the output type?
- A: The outputs are 3-State, allowing connection to shared buses with high-impedance control.
- Q: What is the operating voltage range?
- A: It operates from 4.75V to 5.25V, making it suitable for standard 5V systems.
- Q: What package is available?
- A: It comes in a 20-SSOP (0.154", 3.90mm Width) package.