Texas Instruments CY74FCT2541TSOC

Overview

CY74FCT2541TSOC from Texas Instruments is an octal noninverting 3-state buffer/line driver with 25-Ω output series resistors, designed for memory-address driving, clock distribution, and bus-oriented transmitter/receiver applications in 5-V TTL/CMOS systems. It features Ioff partial-power-down support, 8 ns propagation delay (max), 12 mA sink / 15 mA source drive strength, and reduced transmission-line reflection noise.

For engineers reviewing the CY74FCT2541TSOC datasheet, CY74FCT2541TSOC pinout, CY74FCT2541TSOC application, or CY74FCT2541TSOC equivalent, key selection criteria include its SOIC-20 package, 5-V operation with TTL-compatible inputs, 3-state enable control (OEA/OEB), matched rise/fall times, and integrated 25-Ω series termination for clean signal integrity in high-speed digital buses.

Technical Context

This device implements dual 3-state enable logic (OEA and OEB) controlling eight noninverting buffered outputs, supporting independent or combined output gating. Its edge-rate control circuitry and on-die 25-Ω series resistors suppress ringing and overshoot on PCB traces up to 50 pF load capacitance at 10 MHz switching.

The Ioff feature disables all outputs when VCC = 0 V, preventing backflow current during partial power-down - critical for hot-swap and mixed-voltage system designs. Input thresholds (VIH = 2 V min, VIL = 0.8 V max) and output levels (VOH = 2.4 V min at –15 mA, VOL = 0.55 V max at 12 mA) ensure robust interoperability with legacy TTL and modern CMOS logic families.

Key Specifications

Pinout & Package

SOIC-20 (DW package), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, JEDEC MS-013 compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74F244N and 74ACT244SCX, CY74FCT2541TSOC uniquely integrates 25-Ω series termination and Ioff in a 5-V SOIC-20 package - delivering lower BOM count, safer hot-swap capability, and improved signal integrity without sacrificing speed or compatibility.

Availability

CY74FCT2541TSOC is available at Aetrix Electronics and suitable for memory address driving, clock distribution, and bus-oriented transmitter/receiver applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant packaging.

Supply support for CY74FCT2541TSOC 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 for industrial, automotive, and communications markets.

The CY74FCT family delivers advanced 5-V TTL-compatible logic with enhanced noise immunity, low power, and integrated features like Ioff and output termination - engineered for reliability in demanding digital interface applications.

FAQ

What is the maximum operating temperature range for CY74FCT2541TSOC?

CY74FCT2541TSOC is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range is validated per TI's recommended operating conditions and supported by thermal impedance data (JA = 58°C/W for SOIC package), making it suitable for use in enclosed control cabinets, factory automation hardware, and outdoor telecom enclosures without forced cooling.

Does CY74FCT2541TSOC support hot-swap or partial-power-down operation?

Yes, CY74FCT2541TSOC includes Ioff circuitry that disables all outputs when VCC = 0 V, limiting Ioff current to ±1 µA. This prevents damaging backflow current from live bus lines into the unpowered device - a critical requirement for hot-plug systems, modular backplanes, and multi-rail power architectures where subsystems power up/down independently.

Can CY74FCT2541TSOC directly replace CY74FCT541T in an existing design?

Yes, CY74FCT2541TSOC is explicitly documented as a functional and pin-compatible replacement for CY74FCT541T, offering identical SOIC-20 pinout, logic behavior, and timing (same 8 ns max propagation delay). The upgrade adds integrated 25-Ω output series resistors and improved noise characteristics - enabling immediate signal integrity improvement without layout changes.

What is the purpose of the dual enable inputs (OEA and OEB) on CY74FCT2541TSOC?

CY74FCT2541TSOC uses two independent active-low 3-state enable inputs (OEA and OEB) to provide flexible output control. Both must be low to enable all eight outputs; either high disables all outputs. This dual-input structure supports fail-safe gating, redundancy schemes, and split-bus configurations - for example, using OEA for master system control and OEB for local peripheral arbitration.

Is CY74FCT2541TSOC compatible with 3.3-V logic inputs?

No, CY74FCT2541TSOC is a 5-V-only device with TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). While 3.3-V logic high outputs (≥2.4 V) may register as valid high inputs, this violates recommended operating conditions and risks marginal operation across temperature and voltage extremes. For guaranteed 3.3-V interface, use a level translator or select a 3.3-V tolerant alternative such as 74LVC244A.