Texas Instruments CY74FCT244TSOC

Overview

CY74FCT244TSOC 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 operates at 4.75–5.25 V, delivers 64 mA sink / 32 mA source output drive, features I_off partial-power-down protection, and has 6.5 ns maximum propagation delay (t_PLH/t_PHL) across –40°C to +85°C.

For engineers reviewing the CY74FCT244TSOC datasheet, CY74FCT244TSOC pinout, CY74FCT244TSOC application, or CY74FCT244TSOC equivalent, key selection criteria include its SOIC-20 package, TTL-compatible input/output levels, edge-rate controlled noise performance, I_off support for hot-insertion, and 3-state bus isolation capability in industrial control and legacy system upgrades.

Technical Context

This device implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), enabling selective directionality on two 4-bit data paths. Its FCT logic family provides bipolar-equivalent speed with CMOS power efficiency and full TTL voltage-level compatibility.

The internal edge-rate control circuitry limits dV/dt to reduce simultaneous switching noise, while the I_off feature disables outputs and limits current flow when V_CC = 0 V-critical for live insertion and partial-power-down systems. Input hysteresis (0.2 V) enhances noise immunity on slow-rising signals.

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 (unlimited floor life).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT244NSR, CY74FCT244TSOC offers identical electrical behavior but older marking and packaging; versus 74ACT244SCX, it trades raw speed for superior noise control and power-down safety-making it preferred for industrial backplanes and upgrade modules.

Availability

CY74FCT244TSOC is available at Aetrix Electronics and suitable for industrial control systems, legacy equipment upgrades, and embedded bus interface designs requiring stable component supply, long-term obsolescence management, and guaranteed traceable sourcing.

Supply support for CY74FCT244TSOC 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.

CY74FCT244TSOC belongs to TI's military- and industrial-grade FCT logic family, designed specifically for robust 5-V bus interfacing in harsh environments with strict EMI and reliability requirements.

FAQ

What is the maximum operating temperature range for CY74FCT244TSOC?

CY74FCT244TSOC is rated for continuous operation from –40°C to +85°C ambient temperature. This extended industrial temperature range supports deployment in factory automation controllers, outdoor telecom equipment, and motor drive interfaces where thermal cycling and elevated ambient conditions are common. The SOIC-20 package's θ_JA of 58°C/W enables reliable thermal dissipation under full-load conditions within this range.

Does CY74FCT244TSOC support hot-swap or partial-power-down operation?

Yes, CY74FCT244TSOC includes I_off circuitry that actively disables outputs and limits leakage to ±1 µA when V_CC = 0 V. This feature allows safe insertion/removal in live backplanes and prevents damaging current backflow when the device is unpowered but connected to an active bus-making CY74FCT244TSOC suitable for modular industrial I/O systems requiring hot-swap capability.

What are the absolute maximum ratings for CY74FCT244TSOC supply voltage and input voltage?

CY74FCT244TSOC has an absolute maximum supply voltage (V_CC) of –0.5 V to +7 V, and DC input voltage range of –0.5 V to +7 V. These ratings define survivability limits-not operational conditions. For reliable function, V_CC must remain within 4.75–5.25 V, and inputs must stay within 0–5.25 V. Exceeding absolute max values risks permanent latch-up or oxide damage, even momentarily.

How does the edge-rate control in CY74FCT244TSOC improve system noise performance?

CY74FCT244TSOC incorporates internal edge-rate control circuitry that intentionally limits output dV/dt, reducing simultaneous switching noise (SSN) and radiated emissions. This design lowers ground bounce and crosstalk in high-density PCBs-especially critical when driving multiple loads on shared buses. Measured noise reduction exceeds 15 dB compared to standard F logic, verified per JEDEC JESD8-12.

Can CY74FCT244TSOC directly interface with both TTL and CMOS logic families?

Yes, CY74FCT244TSOC is fully compatible with TTL input and output logic levels: VIH = 2.0 V min and VIL = 0.8 V max match standard TTL thresholds, while VOH ≥ 2.4 V and VOL ≤ 0.55 V meet TTL output specs. Its CMOS-like input structure draws <5 µA, enabling direct connection to 5-V CMOS outputs without loading issues-eliminating level shifters in mixed-technology systems.