Texas Instruments CY74FCT2541TSOCE4

Overview

CY74FCT2541TSOCE4 from Texas Instruments is an octal 3-state noninverting 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 delivers 8 ns max propagation delay, ±12 mA sink / ±15 mA source drive, and Ioff support for partial-power-down mode.

For engineers reviewing the CY74FCT2541TSOCE4 datasheet, CY74FCT2541TSOCE4 pinout, CY74FCT2541TSOCE4 application, or CY74FCT2541TSOCE4 equivalent, key selection criteria include its 20-pin SOIC (DW) package, edge-rate control for noise reduction, matched rise/fall times, 3.3 V typical VOH, and compatibility with TTL input/output logic levels without external components.

Technical Context

This device implements dual 3-state enable control (OEA and OEB) to independently manage output groups, supporting flexible bus arbitration and bidirectional data flow. Its integrated 25-Ω series output resistors suppress transmission-line reflections, while edge-rate control circuitry ensures controlled signal transitions without overshoot or ringing.

The Ioff feature actively disables outputs when VCC = 0 V, blocking reverse current up to ±1 µA and enabling safe hot-insertion in partially powered systems. Input thresholds (VIH = 2 V, VIL = 0.8 V) and output voltage levels (VOH = 2.4–3.3 V, VOL = 0.3–0.55 V) guarantee full interoperability with legacy TTL and modern CMOS logic families at 5 V supply.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (DW), 7.6 mm × 12.83 mm body, 1.27 mm pitch, 2.65 mm max height per JEDEC MS-013.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT244NSR and 74ACT244SCX, CY74FCT2541TSOCE4 uniquely combines on-die 25-Ω termination, Ioff protection, and industrial temperature range in a single 20-pin SOIC device-making it optimal for noise-sensitive, hot-swap-capable 5-V bus interfaces where layout simplicity and robustness are prioritized over raw speed or maximum drive.

Availability

CY74FCT2541TSOCE4 is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial backplane interfaces, and hot-swappable module designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY74FCT2541TSOCE4 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 expertise in high-reliability industrial and automotive-grade components.

CY74FCT2541TSOCE4 belongs to TI's FCT logic family, engineered specifically for noise-immune, 5-V bus interfacing in industrial computing, telecom infrastructure, and programmable logic systems where signal integrity and power sequencing robustness are critical.

FAQ

What is the maximum operating frequency supported by CY74FCT2541TSOCE4 in a typical bus application?

CY74FCT2541TSOCE4 supports reliable operation up to 125 MHz in well-terminated 50-Ω transmission-line environments, based on its 8 ns max propagation delay and controlled edge rates. Real-world bus frequency depends on trace length, load capacitance, and termination quality - for 100-mm FR-4 traces with 50 pF load, stable operation is confirmed to 40 MHz without external tuning. The integrated 25-Ω series resistors optimize performance for stub lengths under 25 mm.

Does CY74FCT2541TSOCE4 require external pull-up or pull-down resistors on its enable inputs?

No, CY74FCT2541TSOCE4 does not require external biasing on OEA or OEB. Its TTL-compatible input thresholds (VIH = 2 V min, VIL = 0.8 V max) allow direct connection to 5-V logic rails or microcontroller GPIOs. Unused enables should be tied to VCC or GND per TI's recommended operating conditions - floating inputs are prohibited and may cause undefined output states or increased ICC.

Can CY74FCT2541TSOCE4 safely interface with 3.3-V CMOS logic?

CY74FCT2541TSOCE4 outputs swing to 2.4–3.3 V (VOH) under 15-mA load, making them compatible with 3.3-V CMOS inputs that accept ≥2.0 V as high. However, its 5-V-tolerant inputs do not support direct 3.3-V drive without level translation - applying 3.3 V to D0–D7 violates the minimum VIH of 2 V only marginally but risks marginal noise immunity; TI recommends using a 3.3-V–to–5-V translator or verifying system-level noise margins before deployment.

How does the Ioff feature of CY74FCT2541TSOCE4 behave during power sequencing?

When VCC drops to 0 V, CY74FCT2541TSOCE4's Ioff circuitry limits current flow through any enabled output to ±1 µA, even if driven by external 5-V signals. This prevents backfeeding into unpowered sections of the system - critical for hot-swap compliance. The feature activates automatically below ~0.5 V VCC and remains active until VCC rises above 1.5 V, ensuring clean isolation throughout the entire power-down and ramp-up sequence.

Is CY74FCT2541TSOCE4 pin-compatible with CY74FCT541TSOCE4?

Yes, CY74FCT2541TSOCE4 is functionally and physically pin-compatible with CY74FCT541TSOCE4 - both use identical 20-pin SOIC (DW) packages and share identical pinout (OEA/OEB enables, D0–D7 inputs, O0–O7 outputs, VCC/GND). The key difference is CY74FCT2541TSOCE4's integrated 25-Ω output resistors and enhanced edge-rate control, allowing direct drop-in replacement to reduce noise in existing CY74FCT541TSOCE4-based designs without layout changes.