Texas Instruments CY74FCT2541CTSOCT

Overview

CY74FCT2541CTSOCT 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 4.1 ns propagation delay (max), ±15 mA output drive, Ioff partial-power-down support, and reduced transmission-line reflection noise.

For engineers reviewing the CY74FCT2541CTSOCT datasheet, CY74FCT2541CTSOCT pinout, CY74FCT2541CTSOCT application, or CY74FCT2541CTSOCT equivalent, this page delivers verified functional identity, SOIC-20 package mapping, 3-state control timing, output impedance specification, and real-world noise-reduction implementation context - all critical for bus interface integrity and legacy system upgrades.

Technical Context

This device implements dual 3-state enable logic (OEA and OEB) controlling eight noninverting buffered outputs, with edge-rate control circuitry to suppress ringing on high-speed traces. Its 25-Ω integrated series termination eliminates external resistors while maintaining TTL-compatible VOH (3.3 V typ) and VOL (0.55 V max) at 12 mA sink/15 mA source.

The Ioff feature ensures outputs enter high-impedance state when VCC = 0 V, preventing backflow current during partial power-down. Input thresholds (VIH = 2 V min, VIL = 0.8 V max) and 5-V supply operation (4.75–5.25 V) guarantee interoperability with standard TTL and CMOS logic families without level-shifting components.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 7.6 mm × 12.83 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead finish, MSL Level-1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY74FCT2541ATSOCT, the CY74FCT2541CTSOCT delivers tighter timing control for high-frequency bus arbitration; compared with SN74FCT2541CTSOCT, it shares identical performance but reflects Cypress's original design lineage prior to TI acquisition - both remain fully drop-in compatible in SOIC-20 footprint.

Availability

CY74FCT2541CTSOCT is available at Aetrix Electronics and suitable for industrial control backplanes, memory subsystems, and clock distribution networks requiring stable component supply, long-term obsolescence management, and RoHS-compliant SOIC packaging.

Supply support for CY74FCT2541CTSOCT 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 experience in high-reliability industrial and automotive ICs.

The CY74FCT2541CTSOCT belongs to the FCT logic family, engineered for noise-immune 5-V digital interfacing in legacy and mixed-voltage systems - emphasizing signal integrity, power efficiency, and backward compatibility.

FAQ

What is the maximum operating frequency supported by CY74FCT2541CTSOCT?

The CY74FCT2541CTSOCT has a maximum propagation delay of 4.1 ns, supporting reliable operation up to approximately 100 MHz in well-terminated bus environments. Actual usable frequency depends on trace length, load capacitance, and noise margin requirements - measured data shows stable 80-MHz operation with 50-pF loads and 15-cm traces.

Does CY74FCT2541CTSOCT require external pull-up or pull-down resistors on its control pins?

No. The CY74FCT2541CTSOCT OEA and OEB inputs have TTL-compatible thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and negligible input current (±1 µA), allowing direct connection to microcontroller GPIO or FPGA outputs without external biasing. Unused inputs must be tied to VCC or GND per datasheet Note 2.

Can CY74FCT2541CTSOCT be used in partial-power-down systems?

Yes. The CY74FCT2541CTSOCT includes Ioff circuitry that disables outputs and limits leakage to ±1 µA when VCC = 0 V, preventing damaging backflow current from live buses into unpowered sections - a key requirement for hot-swap and low-power standby modes.

How does the 25-Ω output series resistance in CY74FCT2541CTSOCT improve signal integrity?

The integrated 25-Ω series resistor in CY74FCT2541CTSOCT forms a source-termination network with typical PCB trace impedance (~50–75 Ω), reducing signal reflections that cause ringing and timing violations. This eliminates discrete resistors per line, saving space and ensuring consistent termination across all eight outputs.

Is CY74FCT2541CTSOCT pin-compatible with older 74FCT2541 variants?

Yes. CY74FCT2541CTSOCT uses the standard SOIC-20 (DW) package with identical pinout to CY74FCT2541T, CY74FCT2541A, and CY74FCT2541C variants. All share the same D0–D7 inputs, O0–O7 outputs, OEA/OEB enables, VCC, and GND locations - enabling direct replacement in existing layouts.