Texas Instruments CY74FCT2541TQCT

Overview

CY74FCT2541TQCT 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 features Ioff partial-power-down support, matched rise/fall times (1.5–8 ns), 12-mA sink / 15-mA source drive, and reduced VOH (typ. 3.3 V) for improved noise immunity.

For engineers reviewing the CY74FCT2541TQCT datasheet, CY74FCT2541TQCT pinout, CY74FCT2541TQCT application, or CY74FCT2541TQCT equivalent, key selection criteria include its 8 ns max propagation delay, 25-Ω integrated output termination, Ioff-enabled hot-swap capability, and compatibility with legacy FCT/F logic families in high-noise digital backplanes and industrial control buses.

Technical Context

This device implements edge-rate control circuitry to suppress transmission-line reflections without external resistors. Its dual output-enable inputs (OEA and OEB) allow independent control of two 4-bit groups, enabling flexible bus partitioning in multi-master systems.

The Ioff feature actively disables outputs when VCC = 0 V, limiting reverse current to ±1 µA - critical for live-insertion and partial-power-down architectures. Input thresholds (VIH = 2 V, VIL = 0.8 V) ensure full TTL-level interoperability while maintaining CMOS-compatible input leakage (±1 µA).

Key Specifications

Pinout & Package

Package: 20-pin SSOP (DBQ), 0.65-mm pitch, 7.4–7.6 mm width, 12.6–13.0 mm length, 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 CY74FCT2541ATQCT and SN74FCT2541TQCT, the CY74FCT2541TQCT offers the highest timing margin for cost-sensitive industrial bus nodes, while retaining full drop-in compatibility with both alternatives in SSOP-20 footprint and 3-state control architecture.

Availability

CY74FCT2541TQCT is available at Aetrix Electronics and suitable for industrial bus transceivers, memory address drivers, clock distribution networks, and hot-swappable I/O modules requiring stable component supply across extended product lifecycles.

Supply support for CY74FCT2541TQCT 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The CY74FCT logic family targets noise-sensitive 5-V digital systems requiring TTL compatibility, low power, and robust signal integrity - especially in memory expansion, clock fanout, and industrial backplane applications.

FAQ

What is the maximum propagation delay of the CY74FCT2541TQCT at 5 V?

The CY74FCT2541TQCT has a maximum propagation delay (tPLH/tPHL) of 8 ns over the full operating temperature range (–40°C to +85°C) at VCC = 4.75–5.25 V. This value is measured from input transition to output crossing 1.5 V under CL = 50 pF load conditions, as specified in the SCCS041B datasheet switching characteristics table.

Does the CY74FCT2541TQCT support hot-swap operation?

Yes, the CY74FCT2541TQCT supports hot-swap via its Ioff feature: when VCC = 0 V, output leakage is limited to ±1 µA, preventing damaging current backflow from live backplane traces into unpowered circuitry. This allows safe insertion/removal in partially powered systems without external protection circuitry.

What package type and dimensions does the CY74FCT2541TQCT use?

The CY74FCT2541TQCT uses a 20-pin SSOP (Shrink Small Outline Package) with drawing DBQ, measuring 7.4–7.6 mm wide, 12.6–13.0 mm long, and 2.65 mm maximum height. It has 0.65-mm lead pitch and complies with JEDEC MS-013, with pin 1 located in quadrant Q1 per tape-and-reel orientation standards.

How does the 25-Ω output series resistance in the CY74FCT2541TQCT improve signal integrity?

The CY74FCT2541TQCT integrates 20–40 Ω series resistors at each output to dampen transmission-line reflections on PCB traces or cables. When matched to typical 50–75 Ω routing impedances, this reduces overshoot/ringing by >6 dB, enabling reliable operation on 10–15 cm traces without discrete termination components.

Can the CY74FCT2541TQCT directly interface with both TTL and CMOS logic families?

Yes, the CY74FCT2541TQCT is fully compatible with TTL and CMOS inputs and outputs: VIH = 2.0 V and VIL = 0.8 V meet TTL thresholds, while VOH ≥ 2.4 V (min) and VOL ≤ 0.55 V (max) satisfy both TTL and 5-V CMOS logic levels - eliminating level-shifter requirements in mixed-logic designs.