Texas Instruments CY74FCT2240TSOCE4

Overview

CY74FCT2240TSOCE4 from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address, clock, and bus-oriented transmission in TTL-logic-compatible systems. It features on-chip 25-Ω series output resistors, I_off partial-power-down support, 8 ns max propagation delay, ±15 mA output drive, and operates from 4.75 V to 5.25 V across –40°C to +85°C.

For engineers reviewing the CY74FCT2240TSOCE4 datasheet, CY74FCT2240TSOCE4 pinout, CY74FCT2240TSOCE4 application, or CY74FCT2240TSOCE4 equivalent, key selection criteria include 3-state bus interface capability, integrated 25-Ω termination, TTL-level compatibility, I_off protection, and SOIC-20 packaging for industrial control and legacy system upgrades.

Technical Context

This device implements dual independent 4-bit noninverting buffers, each controlled by separate active-low 3-state enable inputs (OEA, OEB). Its edge-rate control circuitry limits slew rate to suppress transmission-line reflections without external components.

The I_off feature disables outputs and blocks current backflow when V_CC = 0 V, enabling safe hot-insertion and partial-power-down operation. Input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) and output levels (V_OL ≤ 0.55 V at 12 mA, V_OH ≥ 2.4 V at –15 mA) ensure full interoperability with TTL, NMOS, and CMOS logic families.

Key Specifications

Pinout & Package

Package: SOIC-20 (SO), 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, MSL Level-2-260°C-1 year.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74F240N and 74ACT240SCX, CY74FCT2240TSOCE4 uniquely combines on-die 25-Ω termination, I_off protection, and industrial temperature range in a single SOIC-20 package-reducing component count and improving system-level robustness without sacrificing timing performance.

Availability

CY74FCT2240TSOCE4 is available at Aetrix Electronics and suitable for industrial control backplanes, legacy system upgrades, and 5 V bus interface applications requiring stable component supply and long-term lifecycle support.

Supply support for CY74FCT2240TSOCE4 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 industrial, automotive, and communications infrastructure markets.

CY74FCT2240TSOCE4 belongs to TI's FCT logic family - engineered for high-speed, low-noise 5 V digital interfacing in mission-critical industrial and computing systems where reliability, signal integrity, and backward compatibility are essential.

FAQ

What is the function of the OEA and OEB pins on the CY74FCT2240TSOCE4?

The OEA and OEB pins are active-low 3-state enable inputs that independently control the output state of two 4-bit buffer groups (OA0–OA3 and OB0–OB3). When asserted low, they enable the corresponding outputs; when high, they place those outputs in high-impedance mode. This allows CY74FCT2240TSOCE4 to manage bidirectional bus arbitration or segment isolation without external logic.

Does the CY74FCT2240TSOCE4 require external termination resistors?

No. The CY74FCT2240TSOCE4 integrates 25-Ω series resistors at each output (OA0–OA3, OB0–OB3), eliminating the need for discrete 22–33 Ω resistors typically used for transmission-line impedance matching. This reduces PCB area, component count, and layout complexity while maintaining signal integrity on 50 Ω traces.

Can the CY74FCT2240TSOCE4 be used in partial-power-down systems?

Yes. The CY74FCT2240TSOCE4 includes I_off circuitry that disables outputs and limits leakage to ±1 µA when V_CC = 0 V. This prevents damaging reverse current flow during hot-swap events or mixed-rail power sequencing - a key requirement for modular industrial backplanes and field-upgradeable systems.

What is the maximum operating frequency supported by the CY74FCT2240TSOCE4?

The CY74FCT2240TSOCE4 supports reliable operation up to 12.5 MHz (8 ns propagation delay), verified under worst-case conditions (V_CC = 4.75 V, T_A = +85°C, C_L = 50 pF). Its edge-rate control ensures clean transitions at this rate without overshoot or ringing, making it suitable for synchronous bus and clock distribution applications within this bandwidth.

Is the CY74FCT2240TSOCE4 pin-compatible with other FCT-series octal buffers?

Yes. The CY74FCT2240TSOCE4 is functionally and pinout-compatible with industry-standard FCT-family octal buffers including CY74FCT2240T, CY74FCT2240AT, and CY74FCT2240CT variants in SOIC-20 packaging. Differences lie only in propagation delay (8 ns vs. 4.8 ns vs. 4.1 ns) and drive strength - all share identical pin mapping, logic behavior, and electrical interface characteristics.