CY74FCT540CTQCTE4

Overview

The CY74FCT540CTQCTE4 is an octal buffer and line driver featuring inverting logic with three-state outputs. Manufactured by Texas Instruments, it operates within a voltage range of 4.75 V to 5.25 V. The device utilizes CMOS technology and provides TTL-compatible inputs. It is housed in a 20-pin SSOP or QSOP package. Key electrical characteristics include a propagation delay of 4.1 ns at 5 V, a high-level output current of -32 mA, and a low-level output current of 64 mA. The static supply current is specified at 200 nA, while the operating supply current reaches 3.3 mA. It supports an extended industrial temperature range from -40°C to +85°C.

Feature Summary

• Provides eight inverting buffer channels with independent three-state control for bus-oriented applications.
• Features TTL-compatible CMOS inputs to ensure compatibility with standard logic families.
• Delivers strong drive capability with high sink and source currents suitable for line driving tasks.

Applications

• Bus-oriented memory and data register systems requiring signal inversion and isolation.
• Clock drivers and buffer circuits in high-speed digital communication interfaces.
• Control signal routing in industrial automation and computing equipment.

Procurement Notes

Verify the specific suffix E4 indicates tape and reel packaging configuration when ordering. Confirm the package variant matches the required footprint, as SSOP and QSOP dimensions may differ slightly. Ensure moisture sensitivity level handling procedures are followed during assembly. Cross-reference the datasheet revision date to confirm parameter consistency with design specifications.

Selection Notes

Select this component when inverting functionality is required alongside three-state bus management. Compare propagation delay specifications against system timing constraints to ensure signal integrity. Evaluate the package type availability based on PCB layout requirements. Consider the power consumption profile relative to other FCT series devices for thermal management planning.

Part Context

This part belongs to the CY74FCT2541 family of octal buffers. While the CY74FCT2541 offers non-inverting logic, the CY74FCT540CTQCTE4 provides inverting logic. Both share similar electrical characteristics and package options. The CY74FCT240ATQCT also offers inverting logic but features different drive strengths and delay times. This distinction allows designers to choose based on polarity needs.

Replacement Considerations

• CY74FCT540T
• CY74FCT540CTSO

FAQ

What is the input type specification for the CY74FCT540CTQCTE4?

The device features TTL-compatible CMOS inputs, which may include Schmitt trigger characteristics depending on the specific datasheet revision.

Does the CY74FCT540CTQCTE4 support bidirectional data flow?

No, this is an inverting buffer with unidirectional data flow from input to output. Bidirectional variants are typically found in the 244 or 245 series.