Texas Instruments CY74FCT541TSOCT

Overview

CY74FCT541TSOCT from Texas Instruments is an 8-bit noninverting buffer/line driver with 3-state outputs, designed for bus-oriented data transmission in TTL- and CMOS-compatible systems. It delivers 64-mA sink and 32-mA source drive capability, 8 ns max propagation delay (tPLH/tPHL), and operates across –40°C to 85°C with 4.75–5.25 V supply. It serves as a memory address or clock driver in industrial control backplanes.

For engineers reviewing the CY74FCT541TSOCT datasheet, CY74FCT541TSOCT pinout, CY74FCT541TSOCT application, or CY74FCT541TSOCT equivalent, key selection criteria include 3-state output timing (tPZH/tPHZ ≤ 10 ns), Ioff-enabled partial-power-down support, edge-rate controlled noise immunity, and SOIC-20 package compatibility with legacy FCT logic families.

Technical Context

The CY74FCT541TSOCT implements dual 3-state enable inputs (OEA and OEB) controlling all eight outputs simultaneously, supporting flexible bus arbitration. Its TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and CMOS-level output swing (VOH = 2.4 V min at –32 mA, VOL = 0.55 V max at 64 mA) ensure interoperability without level-shifting components.

Edge-rate control circuitry limits slew rate to suppress simultaneous switching noise, while matched rise/fall times (typical 3.3 ns) minimize signal distortion. The Ioff feature disables outputs and limits leakage to ±1 µA when VCC = 0 V, enabling safe hot-insertion and partial-power-down operation in mixed-supply systems.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 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 8-bit noninverting buffer applications.

Compared with SN74FCT541CTSOCT and 74ACT541SCX, CY74FCT541TSOCT provides optimal balance of industrial temperature range, robust Ioff, and 64-mA drive - making it preferred for embedded control systems requiring reliability under power sequencing stress and heavy bus loading.

Availability

CY74FCT541TSOCT is available at Aetrix Electronics and suitable for industrial backplane bus drivers, memory address buffering, clock distribution hubs, and legacy system interface adapters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY74FCT541TSOCT 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.

CY74FCT541TSOCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible digital interfacing in mission-critical industrial systems where reliability under thermal and power stress is paramount.

FAQ

What is the maximum operating temperature range for CY74FCT541TSOCT?

CY74FCT541TSOCT is rated for operation from –40°C to +85°C ambient temperature. This extended industrial temperature range ensures reliable performance in factory automation, motor control, and outdoor instrumentation environments where thermal cycling and sustained high-temperature operation occur. The SOIC-20 package's 58°C/W θJA supports this rating with standard PCB copper area.

Does CY74FCT541TSOCT support partial-power-down mode?

Yes, CY74FCT541TSOCT supports partial-power-down mode via its Ioff circuitry. When VCC = 0 V, output leakage is limited to ±1 µA even with input/output voltages up to 4.5 V - preventing damaging backflow current during hot-swap or staged power-up sequences. This feature is explicitly verified in the datasheet's electrical characteristics table under Ioff parameter.

What are the key timing parameters for CY74FCT541TSOCT 3-state control?

CY74FCT541TSOCT specifies tPZH/tPZL (enable-to-high-Z) and tPHZ/tPLZ (disable-from-high-Z) times of 1.5–10 ns each. These values define the maximum time required for outputs to enter or exit high-impedance state after OEA/OEB transitions, enabling precise bus arbitration in multiprocessor systems. All values are guaranteed over –40°C to 85°C and 4.75–5.25 V supply.

Can CY74FCT541TSOCT interface directly with 3.3-V logic inputs?

CY74FCT541TSOCT outputs meet TTL logic levels (VOH ≥ 2.4 V at –32 mA, VOL ≤ 0.55 V at 64 mA), which are compatible with 3.3-V CMOS inputs having VIH(min) ≤ 2.0 V and VIL(max) ≥ 0.8 V. However, its inputs require 2.0 V minimum VIH - so 3.3-V logic outputs can drive CY74FCT541TSOCT directly, but CY74FCT541TSOCT outputs should not drive 3.3-V-only inputs without verification of absolute maximum ratings.

What package type and dimensions does CY74FCT541TSOCT use?

CY74FCT541TSOCT uses the SOIC-20 (DW) package: 7.5 mm × 12.8 mm body size, 1.27 mm lead pitch, 2.35 mm nominal height. It is supplied in tape-and-reel format (2000 units per reel) with Q1 pin-1 quadrant orientation, RoHS-compliant NiPdAu lead finish, and MSL Level-1 rating for unlimited floor life and reflow exposure.