Texas Instruments CY74FCT541TQCT

Overview

CY74FCT541TQCT 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 delivers 64-mA sink and 32-mA source drive at 5-V operation, features Ioff partial-power-down protection, and supports industrial temperature range (–40°C to 85°C) in QSOP-20 package.

For engineers reviewing the CY74FCT541TQCT datasheet, CY74FCT541TQCT pinout, CY74FCT541TQCT application, or CY74FCT541TQCT equivalent, key selection criteria include 3-state output timing (tPZH ≤ 10 ns), edge-rate control for noise immunity, Ioff-enabled system-level power sequencing, and compatibility with TTL input thresholds and 3.3-V–compatible VOH.

Technical Context

This device implements dual 3-state enable inputs (OEA and OEB) controlling eight independent noninverting buffer channels. Its edge-rate control circuitry actively limits slew rate to reduce simultaneous switching noise without external components.

The Ioff feature disables all outputs when VCC = 0 V, limiting current backflow to ±1 µA per terminal-enabling safe hot-insertion and partial-power-down operation in mixed-supply systems. Input thresholds match TTL logic levels (VIH = 2 V min, VIL = 0.8 V max), ensuring direct interface with legacy bipolar and modern CMOS devices.

Key Specifications

Pinout & Package

QSOP-20 (DBQ) package: 20-pin, 0.15 mm pitch, 4.4 mm × 7.2 mm body, moisture sensitivity level 2 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT541ATQCT and 74ACT541SCX, CY74FCT541TQCT provides optimal balance of industrial temperature range, Ioff safety, noise-controlled edge rates, and cost-making it preferred for new industrial and embedded designs requiring robust bus interfacing.

Availability

CY74FCT541TQCT is available at Aetrix Electronics and suitable for industrial control systems, embedded communications interfaces, and programmable logic peripheral buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY74FCT541TQCT 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.

CY74FCT541TQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible buffering in mission-critical industrial and infrastructure applications.

FAQ

What is the maximum recommended operating voltage for CY74FCT541TQCT?

The absolute maximum supply voltage for CY74FCT541TQCT is 7 V, but the recommended operating range is 4.75 V to 5.25 V. Operating outside this range may cause timing violations, increased power dissipation, or reduced reliability. All electrical specifications-including VOH, VOL, and propagation delay-are guaranteed only within the 4.75–5.25 V window per the SCCS072 datasheet.

Does CY74FCT541TQCT support hot-swap or partial-power-down operation?

Yes, CY74FCT541TQCT supports partial-power-down via its Ioff circuitry. When VCC = 0 V, output leakage is limited to ±1 µA, preventing damaging back-current flow through I/O pins. This enables safe hot-insertion in modular backplane systems and power sequencing in multi-rail designs-provided all inputs/outputs are biased within –0.5 V to 7 V during power transitions.

How does the edge-rate control in CY74FCT541TQCT improve system noise performance?

CY74FCT541TQCT integrates internal edge-rate control that actively limits output slew rate, reducing high-frequency spectral content and simultaneous switching noise (SSN). This eliminates the need for external series resistors while maintaining signal integrity on shared buses-verified by significantly improved noise characteristics versus standard FCT buffers per the SCCS072 datasheet.

Can CY74FCT541TQCT interface directly with 3.3-V CMOS receivers?

Yes, CY74FCT541TQCT can interface directly with 3.3-V CMOS receivers. Its VOH is guaranteed ≥2.4 V at 32-mA load (with VCC = 4.75 V), exceeding the VIH(min) = 2.0 V requirement of most 3.3-V logic families. No level-shifter is needed, though designers should verify receiver input capacitance and trace length to ensure timing margins remain intact.

What is the function of the dual enable inputs (OEA and OEB) on CY74FCT541TQCT?

OEA and OEB are active-low 3-state enable inputs that collectively control all eight outputs. Both must be low to enable outputs; if either is high, all outputs enter high-impedance state. This dual-enable architecture allows flexible bus arbitration-e.g., one enable can be tied to a system controller while the other serves as local channel gating-without requiring external logic.