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| Product attributes | Property Value |
| Manufacturer | Fairchild Semiconductor |
| Product Series | 74AC |
| 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 | 24mA, 24mA |
| Voltage - Supply | 2V ~ 6V |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Grade | - |
| Qualification | - |
| Mounting Type | Surface Mount |
| Package / Case | 20-SOIC (0.209", 5.30mm Width) |
| Supplier Device Package | 20-SOP |
| ROHS |  |
The 74AC540SJX from Fairchild Semiconductor is a single inverting buffer with 3-state output. It operates from 2V to 6V, making it versatile for both 3.3V and 5V applications. The device can sink or source 24mA, providing strong drive for bus lines and peripheral loads. Packaged in a 20-SOIC, it is suitable for industrial controls, test equipment, and general-purpose logic circuits where a single inverting buffer with high-impedance capability is needed.
- Single-Channel Simplicity: Ideal for designs requiring only one inverting buffer, saving board space.
- Wide 2V to 6V Operation: Compatible with multiple voltage standards, enhancing design flexibility.
- 3-State Output: Enables bus sharing and prevents bus contention.
- 24mA Drive Capability: Ensures reliable signal transmission to multiple loads.
- 74AC High-Speed Family: Provides low propagation delay for time-sensitive circuits.
Single-Channel Bus Buffering
Use the 74AC540SJX when only one inverting buffer channel is needed. Its 3-state output allows direct connection to a data bus, reducing component count.
Signal Conditioning in 5V Systems
In legacy 5V industrial equipment, this buffer provides clean signal amplification. The 24mA output current drives multiple TTL loads without degradation.
Level Translation for 3.3V to 5V
With a 2V to 6V range, it can accept 3.3V inputs and output 5V levels, acting as a simple level shifter for mixed-voltage designs.
Driving High-Capacitance Loads
The robust output stage handles capacitive loads like long PCB traces or multiple gate inputs, maintaining signal integrity in complex boards.
Test Fixtures and Prototyping
In lab setups, this buffer isolates the device under test from the measurement equipment, preventing loading effects and ensuring accurate readings.
Power Supply Sequencing Logic
Use the inverting buffer to generate complementary control signals for power supply enable/disable sequences in multi-rail systems.
- Q: What is the logic family of the 74AC540SJX?
- A: It belongs to the 74AC family, known for high-speed CMOS operation.
- Q: What function does this IC perform?
- A: It is a single inverting buffer with 3-state outputs, ideal for bus driving.
- Q: How many channels does it have?
- A: It has 1 channel, providing a single inverting buffer path.
- Q: What is the output type?
- A: The output is 3-State, allowing connection to a shared bus with high-impedance state.
- Q: What is the voltage range?
- A: It operates from 2V to 6V, supporting both 3.3V and 5V logic.
- Q: What package is available?
- A: It is offered in a 20-SOIC (0.209", 5.30mm Width) package.
74AC540SJX.pdf
- Q: What is the logic family of the 74AC540SJX?
- A: It belongs to the 74AC family, known for high-speed CMOS operation.
- Q: What function does this IC perform?
- A: It is a single inverting buffer with 3-state outputs, ideal for bus driving.
- Q: How many channels does it have?
- A: It has 1 channel, providing a single inverting buffer path.
- Q: What is the output type?
- A: The output is 3-State, allowing connection to a shared bus with high-impedance state.
- Q: What is the voltage range?
- A: It operates from 2V to 6V, supporting both 3.3V and 5V logic.
- Q: What package is available?
- A: It is offered in a 20-SOIC (0.209", 5.30mm Width) package.