Texas Instruments CY74FCT240CTSOCG4

Overview

CY74FCT240CTSOCG4 from Texas Instruments is an octal noninverting 3-state 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 voltage levels.

For engineers reviewing the CY74FCT240CTSOCG4 datasheet, CY74FCT240CTSOCG4 pinout, CY74FCT240CTSOCG4 application, or CY74FCT240CTSOCG4 equivalent, key selection considerations include 3-state bus isolation capability, industrial temperature range (–40°C to 85°C), SOIC-20 package with lead-free NiPdAu finish, and compatibility with FCT logic families in high-noise digital systems.

Technical Context

This device implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), supporting bidirectional bus interface via separate A- and B-side inputs/outputs. Each section drives eight outputs with matched rise/fall times and edge-rate control circuitry to suppress switching noise.

It operates from a 4.75-V to 5.25-V supply, meets JESD22 ESD ratings (2000-V HBM, 200-V MM, 1000-V CDM), and uses Ioff to disable outputs during partial power-down-preventing backflow current when VCC = 0 V.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW), 7.5 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu lead 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 SN74FCT240CTSOCT, CY74FCT240CTSOCG4 offers identical performance but with G4 suffix indicating green (lead-free) compliance and specific tape-and-reel packaging; versus 74ACT240SCX, it delivers superior noise suppression, higher drive, and essential Ioff for modern power-managed systems.

Availability

CY74FCT240CTSOCG4 is available at Aetrix Electronics and suitable for memory subsystems, industrial bus interfaces, clock distribution networks, and legacy-to-modern voltage translation requiring stable component supply and long-term lifecycle support.

Supply support for CY74FCT240CTSOCG4 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.

CY74FCT240CTSOCG4 belongs to the 74FCT logic family, engineered for high-speed, low-noise, TTL-compatible digital interfacing in mission-critical industrial and computing infrastructure.

FAQ

What is the maximum operating frequency supported by CY74FCT240CTSOCG4?

CY74FCT240CTSOCG4 does not specify a maximum clock frequency in its datasheet because it is a combinatorial buffer-not a clocked device. Its usable frequency limit depends on propagation delay (4.3 ns max) and load capacitance. For a 50-pF load, it reliably supports data/address bus transitions up to ~100 MHz with adequate timing margin. System-level timing analysis must account for board trace delays and receiver setup/hold requirements.

Does CY74FCT240CTSOCG4 support hot-swap or live-insertion?

Yes, CY74FCT240CTSOCG4 supports partial-power-down operation via its Ioff feature. When VCC = 0 V, Ioff limits off-state input/output leakage to ±1 µA, preventing damaging back-current flow from live buses into the unpowered device. This enables safe hot-swap in modular backplane or field-replaceable unit designs-provided OE pins are held inactive (high) during insertion.

What is the meaning of the "G4" suffix in CY74FCT240CTSOCG4?

The "G4" suffix in CY74FCT240CTSOCG4 indicates TI's green packaging standard: lead-free (Pb-free), RoHS-compliant construction with NiPdAu lead finish, and adherence to JEDEC MSL Level-1 moisture sensitivity classification. It also denotes tape-and-reel packaging (2000 units per reel) with Q1 pin-1 quadrant orientation per TI's carrier tape specification.

Can CY74FCT240CTSOCG4 drive multiple TTL inputs directly?

Yes, CY74FCT240CTSOCG4 can drive at least 10 standard TTL inputs per output. With 64-mA sink and 32-mA source capability, and guaranteed VOH ≥2.4 V at –32 mA and VOL ≤0.55 V at 64 mA, it exceeds the TTL fan-out requirement (IIL = –1.6 mA, IIH = 40 µA). No external pull-ups or series resistors are needed for direct TTL interfacing.

Is CY74FCT240CTSOCG4 pin-compatible with CY74FCT240ATSOC?

Yes, CY74FCT240CTSOCG4 and CY74FCT240ATSOC share identical SOIC-20 (DW) package, pinout, and logic function. The only differences are speed grade (4.3 ns vs. 4.8 ns propagation delay) and temperature rating (both –40°C to 85°C), making them functionally interchangeable in most designs-though timing-critical applications should verify slack with the slower variant.