Texas Instruments CY74FCT2240CTSOCG4

Overview

CY74FCT2240CTSOCG4 from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and clock distribution in TTL- and CMOS-compatible systems. It features on-chip 25-Ω series output resistors, 4.1 ns typical propagation delay, ±15 mA output drive, Ioff partial-power-down support, and operates at 4.75–5.25 V over –40°C to 85°C.

For engineers reviewing the CY74FCT2240CTSOCG4 datasheet, CY74FCT2240CTSOCG4 pinout, CY74FCT2240CTSOCG4 application, or CY74FCT2240CTSOCG4 equivalent, key selection criteria include 3-state bus interface capability, edge-rate controlled noise suppression, TTL-level compatibility, and SOIC-20 packaging with Ioff-enabled system power sequencing.

Technical Context

This device implements dual independent 4-bit noninverting buffers, each with separate 3-state enable inputs (OEA and OEB), supporting bidirectional bus isolation. Its internal 25-Ω series termination eliminates external resistors and reduces transmission-line reflections in high-speed digital interconnects.

The Ioff circuitry actively disables outputs when VCC = 0 V, limiting reverse current to ±1 µA and enabling safe hot-insertion and partial-power-down operation. Input thresholds (VIH = 2 V, VIL = 0.8 V) and output levels (VOH ≥ 2.4 V, VOL ≤ 0.55 V at 12 mA) ensure robust interoperability with TTL, NMOS, and CMOS logic families.

Key Specifications

Pinout & Package

Package: SOIC-20 (SO), body size 7.5 mm × 12.8 mm, 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 SN74FCT240NSR and 74ACT240SCX, CY74FCT2240CTSOCG4 uniquely combines industrial temperature range, on-die termination, and sub-5 ns speed-making it optimal for space-constrained, high-reliability bus interfaces where layout parasitics must be actively managed.

Availability

CY74FCT2240CTSOCG4 is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, industrial I/O expansion, and bus transceiver interfaces requiring stable component supply across automotive, industrial, and communications equipment lifecycles.

Supply support for CY74FCT2240CTSOCG4 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.

CY74FCT2240CTSOCG4 belongs to the 74FCT logic family-designed specifically for high-speed, low-noise 5-V TTL-compatible digital interfacing with enhanced power efficiency and robustness in real-world PCB environments.

FAQ

What is the operating temperature range for CY74FCT2240CTSOCG4?

CY74FCT2240CTSOCG4 is specified for operation from –40°C to +85°C ambient temperature, making it suitable for industrial and extended-temperature applications. This range is confirmed in the "Recommended Operating Conditions" table of the TI datasheet SCCS036A, and aligns with its SOIC packaging and thermal resistance (θJA = 58°C/W).

Does CY74FCT2240CTSOCG4 support hot-swap or partial-power-down operation?

Yes, CY74FCT2240CTSOCG4 includes Ioff circuitry that disables outputs when VCC = 0 V, limiting reverse current to ±1 µA. This feature enables safe hot-insertion into live backplanes and supports partial-power-down system architectures-critical for modular PLCs and telecom line cards where subsystems power up/down independently.

What is the purpose of the 25-Ω series resistors inside CY74FCT2240CTSOCG4?

The 25-Ω on-die series resistors in CY74FCT2240CTSOCG4 dampen transmission-line reflections on PCB traces, reducing overshoot, undershoot, and ringing without external components. They are optimized for 50-Ω trace impedance and directly improve signal integrity in memory address and clock distribution paths up to 25 MHz.

Is CY74FCT2240CTSOCG4 pin-compatible with other 74FCT240 variants?

Yes, CY74FCT2240CTSOCG4 is functionally and pinout-compatible with the broader 74FCT240 family-including CY74FCT240T, SN74FCT240N, and 74FCT240. All share identical SOIC-20 pin assignments, logic functions, and DC/AC electrical behavior, differing only in speed grade (e.g., 4.1 ns vs. 8 ns) and temperature rating.

What logic families can CY74FCT2240CTSOCG4 interface with directly?

CY74FCT2240CTSOCG4 provides TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and output voltage levels (VOH ≥ 2.4 V, VOL ≤ 0.55 V), enabling direct interface with 74LS, 74ALS, 74AS, and 5-V CMOS without level shifters. Its 12 mA sink / 15 mA source drive also supports legacy NMOS microprocessor buses.