Texas Instruments CY74FCT541CTSOC

Overview

CY74FCT541CTSOC from Texas Instruments is an 8-bit noninverting buffer/line driver with 3-state outputs, designed for memory address and clock distribution, bus interfacing, and TTL/CMOS level translation. It operates at 4.75–5.25 V, delivers 64-mA sink / 32-mA source drive, features Ioff partial-power-down support, and achieves 4.1-ns typical propagation delay.

For engineers reviewing the CY74FCT541CTSOC datasheet, CY74FCT541CTSOC pinout, CY74FCT541CTSOC application, or CY74FCT541CTSOC equivalent, key selection criteria include 3-state bus isolation capability, 5-V TTL-compatible input thresholds, edge-rate controlled outputs for noise reduction, and SOIC-20 packaging for industrial board space constraints.

Technical Context

This device implements dual active-low 3-state enable controls (OEA and OEB) to independently gate eight noninverting output channels. Its FCT-family architecture ensures function, pinout, and drive compatibility with industry-standard FCT and F logic families while maintaining full TTL input/output voltage level interoperability.

The integrated edge-rate control circuitry shapes output transitions to reduce simultaneous switching noise, and the Ioff specification guarantees ≤±1 µA off-state leakage when VCC = 0 V-enabling safe back-drive protection during partial power-down in mixed-voltage systems.

Key Specifications

Pinout & Package

CY74FCT541CTSOC uses a 20-pin SOIC (DW) package with 1.27-mm lead pitch and 0.300″ body width. Thermal impedance θJA = 58°C/W supports continuous operation at ambient temperatures up to +85°C under typical PCB layout conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-bit noninverting buffer applications.

Compared with CY74FCT541ATSOC, CY74FCT541CTSOC delivers higher drive and faster timing for demanding bus loads; versus SN74FCT541CTSOCT, it shares identical performance but differs only in part numbering convention and orderable marking-both are fully interchangeable in design and layout.

Availability

CY74FCT541CTSOC is available at Aetrix Electronics and suitable for industrial automation, embedded instrumentation, and legacy system upgrades requiring stable component supply, long-lifecycle support, and RoHS-compliant SOIC packaging.

Supply support for CY74FCT541CTSOC includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with decades of heritage in high-reliability logic families.

CY74FCT541CTSOC belongs to the FCT logic series engineered for noise-immune, high-drive 5-V digital interfacing-targeting industrial control, test equipment, and military-grade systems requiring robust timing and power-down safety.

FAQ

What is the maximum operating temperature range for CY74FCT541CTSOC?

CY74FCT541CTSOC is rated for operation from –40°C to +85°C ambient temperature. This industrial temperature range is validated per the recommended operating conditions table in the SCCS072 datasheet, and the SOIC-20 package's 58°C/W thermal impedance supports continuous use at full load within this envelope when mounted on standard FR-4 PCBs with adequate copper pour.

Does CY74FCT541CTSOC support partial power-down mode?

Yes, CY74FCT541CTSOC supports partial power-down mode via its Ioff feature. When VCC = 0 V, the outputs are disabled and leakage current is limited to ±1 µA-even if input or output pins are driven to valid logic levels. This protects downstream circuitry during hot-swap or staged power sequencing, and is explicitly tested and guaranteed per JESD78.

What is the purpose of the dual enable inputs (OEA and OEB) on CY74FCT541CTSOC?

The dual active-low enables OEA and OEB on CY74FCT541CTSOC independently control two 4-bit output groups: OEA governs O0–O3, and OEB governs O4–O7. This allows segmented bus management-for example, enabling only upper or lower bytes during memory access cycles or isolating fault domains in redundant systems-without requiring additional logic gates.

Can CY74FCT541CTSOC interface directly with 3.3-V logic devices?

CY74FCT541CTSOC is not 3.3-V tolerant on inputs or outputs. Its absolute maximum input voltage is 7 V, but its VIH minimum is 2.0 V and VIL maximum is 0.8 V-making it compatible with 3.3-V CMOS outputs (which typically swing >2.4 V high and <0.4 V low). However, driving 3.3-V inputs requires external level shifting, as CY74FCT541CTSOC outputs swing rail-to-rail at 5 V.

What package variant does CY74FCT541CTSOC use, and what are its reflow requirements?

CY74FCT541CTSOC uses the SOIC-20 (DW) package with 1.27-mm lead pitch and 0.300″ body width. It carries an MSL Level-1 rating, meaning it is moisture-insensitive and may be reflowed using standard Pb-free profiles (peak 260°C) without baking-per TI's package addendum and JEDEC J-STD-020 compliance documentation.