Texas Instruments CY74FCT240CTQCT

Overview

CY74FCT240CTQCT from Texas Instruments is an octal 3-state noninverting buffer/line driver IC used for memory address driving, clock distribution, and bus transceiver applications. It features 64-mA sink / 32-mA source output drive, 4.3-ns max propagation delay (tPLH/tPHL), Ioff partial-power-down support, and TTL-compatible input/output logic levels.

For engineers reviewing the CY74FCT240CTQCT datasheet, CY74FCT240CTQCT pinout, CY74FCT240CTQCT application, or CY74FCT240CTQCT equivalent, key selection considerations include its QSOP-20 package, −40°C to 85°C industrial temperature range, 4.75–5.25 V supply operation, and compatibility with FCT-family timing and drive requirements in high-noise digital systems.

Technical Context

The CY74FCT240CTQCT implements dual 4-bit noninverting buffer sections, each controlled by independent 3-state enable inputs (OEA and OEB). Its edge-rate control circuitry limits slew rate to reduce switching noise while maintaining fast 4.3-ns typical propagation delay under load.

It supports partial-power-down via Ioff, which disables outputs and limits reverse current to ±1 µA when VCC = 0 V. Input thresholds (VIH = 2 V min, VIL = 0.8 V max) and output voltage levels (VOH = 2.4 V min at –32 mA, VOL = 0.55 V max at 64 mA) ensure direct interfacing with TTL, NMOS, and CMOS logic without level-shifting components.

Key Specifications

Pinout & Package

Package: QSOP-20 (DBQ), 7.2 mm × 5.3 mm body, 0.65 mm pitch, 2.65 mm max height.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT240CTSOCT and 74AC240MTCX, the CY74FCT240CTQCT delivers superior noise immunity via edge-rate control, guaranteed 64-mA drive at 5 V, and Ioff-enabled partial-power-down-making it the preferred choice for industrial bus and memory subsystems requiring robustness and timing precision.

Availability

CY74FCT240CTQCT is available at Aetrix Electronics and suitable for industrial control systems, legacy bus interface modules, and memory expansion cards requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY74FCT240CTQCT 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 CY74FCT240CTQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise 5-V digital interfacing in mission-critical industrial and telecom infrastructure applications.

FAQ

What is the maximum operating temperature range for the CY74FCT240CTQCT?

The CY74FCT240CTQCT is rated for operation from −40°C to +85°C, meeting industrial-grade environmental requirements. This range is validated per the recommended operating conditions table in the official Texas Instruments datasheet SCCS017A, with thermal performance characterized using θJA = 68°C/W for the QSOP-20 (DBQ) package.

Does the CY74FCT240CTQCT support partial-power-down functionality?

Yes, the CY74FCT240CTQCT includes Ioff circuitry that disables outputs and limits reverse current to ±1 µA when VCC = 0 V. This feature enables safe operation in partial-power-down systems such as hot-pluggable backplanes or multi-rail embedded controllers, as confirmed in the Electrical Characteristics section of the CY74FCT240T datasheet.

What is the propagation delay specification for the CY74FCT240CTQCT?

The CY74FCT240CTQCT has a maximum propagation delay of 4.3 ns (tPLH and tPHL) under standard test conditions (VCC = 4.75–5.25 V, CL = 50 pF, TA = −40°C to +85°C). This value corresponds to the "CY74FCT240CT" speed grade, as specified in the Switching Characteristics table of the SCCS017A datasheet.

Is the CY74FCT240CTQCT pin-compatible with other FCT240 variants?

Yes, the CY74FCT240CTQCT shares identical pinout and function mapping with all CY74FCT240x variants in QSOP-20 (DBQ) and SOIC-20 (DW) packages, including CY74FCT240ATQCT and CY74FCT240TQCT. Pin assignments for OEA, OEB, DA0–DA3, DB0–DB3, OA0–OA3, OB0–OB3, VCC, and GND are fully consistent across the family.

What package type and RoHS status does the CY74FCT240CTQCT have?

The CY74FCT240CTQCT uses a QSOP-20 (DBQ) package, 7.2 mm × 5.3 mm, with 0.65 mm lead pitch and NIPDAU lead finish. It is RoHS-compliant (lead-free), with MSL Level-2 rating (260°C peak reflow, 1-year floor life), as documented in TI's Package Option Addendum dated July 2026.