Texas Instruments CY74FCT2240TS0C

Overview

CY74FCT2240TS0C from Texas Instruments is an octal 3-state buffer/line driver with integrated 25-Ω output series resistors, TTL-compatible input/output levels, and I_off support for partial-power-down operation. It delivers 8 ns max propagation delay, ±15 mA output drive, and operates across –40°C to 85°C in SOIC-20 package - used in memory address buffering, clock distribution, and bus transceiver applications.

For engineers reviewing the CY74FCT2240TS0C datasheet, CY74FCT2240TS0C pinout, CY74FCT2240TS0C application, or CY74FCT2240TS0C equivalent, key selection criteria include 3-state control timing (t_PZH/t_PLZ ≤ 9.5 ns), on-die termination for reflection suppression, I_off-enabled system-level power sequencing, and compatibility with TTL/NMOS/CMOS logic families without level-shifting components.

Technical Context

This device implements dual independent 3-state enable controls (OEA and OEB) driving four noninverting (OA0–OA3) and four inverting (OB0–OB3) outputs. Each output integrates a 25-Ω series resistor to damp transmission-line reflections without external components.

Its edge-rate control circuitry limits di/dt-induced noise, while I_off disables outputs and blocks reverse current flow when V_CC = 0 V - enabling hot-insertion and mixed-voltage system interoperability. Input thresholds (V_IL = 0.8 V, V_VIH = 2.0 V) and output swing (V_OL ≤ 0.55 V at 12 mA, V_OH ≥ 2.4 V at –15 mA) ensure robust TTL interfacing.

Key Specifications

Pinout & Package

SOIC-20 package (DW drawing), 7.5 mm × 12.8 mm body, 1.27 mm pitch, RoHS-compliant CU-NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT2240NSR and 74ACT240SCX, CY74FCT2240TS0C uniquely combines industrial temperature rating, I_off-enabled power sequencing, and on-die termination - reducing design risk in thermally demanding, hot-pluggable, or space-constrained systems.

Availability

CY74FCT2240TS0C is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and bus transceiver applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant sourcing.

Supply support for CY74FCT2240TS0C 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 over 50 years of innovation in high-reliability interface and timing products.

CY74FCT2240TS0C belongs to the FCT logic family - designed specifically for high-speed, low-noise digital interfacing in industrial, computing, and communications systems where signal integrity and power sequencing are critical.

FAQ

What is the maximum operating frequency supported by CY74FCT2240TS0C?

CY74FCT2240TS0C does not specify a maximum clock frequency directly, but its 8 ns maximum propagation delay (t_PLH/t_PHL) supports reliable operation in 25-MHz bus systems with adequate setup/hold margins. For clock distribution, it maintains signal integrity up to 100 MHz when driving controlled-impedance traces with its integrated 25-Ω resistors.

Does CY74FCT2240TS0C support hot-swap or partial-power-down operation?

Yes, CY74FCT2240TS0C includes I_off circuitry that disables outputs and limits reverse current to ±1 µA when V_CC = 0 V. This feature enables safe insertion into live backplanes and interoperability with mixed-voltage subsystems - a key requirement for industrial hot-swap architectures.

How does the integrated 25-Ω output resistor in CY74FCT2240TS0C improve signal integrity?

The 25-Ω series resistor in CY74FCT2240TS0C matches typical PCB trace impedance (50–75 Ω) to suppress reflections caused by impedance discontinuities. This reduces overshoot, undershoot, and ringing on traces longer than 5 cm - eliminating the need for eight discrete resistors and improving timing margin in high-speed memory and address paths.

Can CY74FCT2240TS0C interface directly with 3.3-V logic devices?

Yes, CY74FCT2240TS0C accepts 3.3-V logic-high inputs (V_IH = 2.0 V min) and outputs 5-V TTL levels. Its input thresholds are compatible with 3.3-V LVTTL, allowing direct connection to FPGA or MCU I/O banks without level shifters - provided the 3.3-V device can tolerate 5-V inputs (check receiver specification).

What is the function of the OEA and OEB pins on CY74FCT2240TS0C?

OEA and OEB are active-low 3-state enable inputs controlling separate output groups: OEA enables OA0–OA3 (noninverting), and OEB enables OB0–OB3 (inverting). They allow independent gating of complementary outputs - useful for bidirectional bus control, clock enable zoning, or staggered output activation to reduce simultaneous switching noise.