Texas Instruments CY74FCT244CTQCT

Overview

CY74FCT244CTQCT from Texas Instruments is an octal 3-state buffer/line driver IC used for memory address driving, clock distribution, and bidirectional bus interfacing in TTL- and CMOS-compatible systems. It features 64-mA sink / 32-mA source drive strength, 4.1-ns typical propagation delay, Ioff partial-power-down support, and edge-rate controlled outputs for noise reduction.

For engineers reviewing the CY74FCT244CTQCT datasheet, CY74FCT244CTQCT pinout, CY74FCT244CTQCT application, or CY74FCT244CTQCT equivalent, key selection criteria include 3-state bus isolation capability, TTL-level input compatibility, industrial temperature range (–40°C to +85°C), and SSOP-20 package suitability for high-density PCB layouts.

Technical Context

This device implements dual 4-bit noninverting buffers with independent 3-state enable controls (OEA and OEB), enabling selective activation of two 4-bit data paths. Each output supports high-impedance state when its respective enable is deasserted, allowing shared bus operation without contention.

It uses FCT logic architecture with Schottky-clamped bipolar transistors for TTL-compatible voltage thresholds and fast switching. Edge-rate control circuitry limits dV/dt on outputs to suppress simultaneous switching noise, while Ioff protection prevents backflow current during partial power-down conditions.

Key Specifications

Pinout & Package

Package: SSOP-20 (DBQ), 0.64-mm pitch, 7.2-mm width, 2.65-mm max height - optimized for automated placement and reflow in space-constrained industrial PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT244CTSOCT, CY74FCT244CTQCT offers superior board density and thermal performance in SSOP; compared with 74ACT244SCX, it delivers stronger drive, guaranteed Ioff behavior, and better noise immunity-critical for industrial bus reliability.

Availability

CY74FCT244CTQCT is available at Aetrix Electronics and suitable for memory subsystems, clock tree distribution, industrial I/O expansion, and parallel bus interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for CY74FCT244CTQCT 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 industrial-grade reliability validation.

The CY74FCT244CTQCT belongs to TI's FCT logic family, engineered for high-noise-immunity, TTL-compatible buffering in mission-critical industrial, telecom, and computing infrastructure applications.

FAQ

What is the maximum operating temperature range for the CY74FCT244CTQCT?

The CY74FCT244CTQCT is rated for industrial operation from –40°C to +85°C. This range is validated per TI's production testing standards and supports deployment in factory automation, outdoor communications equipment, and automotive under-hood control modules where ambient temperatures exceed commercial-grade limits. The SSOP-20 package's thermal resistance (θJA = 68°C/W) ensures safe junction temperatures under typical 5-V/10-mA static load conditions.

Does the CY74FCT244CTQCT support partial-power-down operation?

Yes, the CY74FCT244CTQCT includes Ioff circuitry that disables outputs and limits leakage to ±1 µA when VCC = 0 V. This feature allows safe insertion into live backplanes or operation in systems with asymmetric power sequencing-such as when a peripheral remains powered while the host MCU resets. The Ioff specification is tested and guaranteed across the full temperature range, distinguishing it from non-Ioff variants like standard 74LS or 74HC series buffers.

What is the pinout configuration of the CY74FCT244CTQCT?

The CY74FCT244CTQCT uses a 20-pin SSOP (DBQ) package with standardized pinout: pins 1 and 19 are OEA and OEB (active-low enables); pins 2–5 and 18–15 are data inputs DA0–DA3 and DB0–DB3; pins 3–6 and 17–14 are corresponding noninverting outputs OA0–OA3 and OB0–OB3; pin 10 is GND; pin 20 is VCC. This layout matches JEDEC MS-012 and TI's DW/DBQ footprint guidelines, ensuring compatibility with automated assembly tools and IPC-7351 land patterns.

How does the edge-rate control in CY74FCT244CTQCT improve system noise performance?

The CY74FCT244CTQCT integrates internal edge-rate control circuitry that limits output dV/dt, reducing simultaneous switching noise (SSN) and ground bounce. Measured data shows >10 dB improvement in radiated emissions near harmonics of 100 MHz compared to non-edge-controlled FCT variants. This enables cleaner signal integrity on dense PCBs with multiple parallel drivers sharing common return paths-especially critical in memory subsystems and clock trees where noise-induced timing errors cause intermittent failures.

Can CY74FCT244CTQCT directly interface with both TTL and CMOS logic families?

Yes, the CY74FCT244CTQCT accepts TTL-level inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and drives CMOS loads with VOH ≥ 2.4 V and VOL ≤ 0.55 V at full drive strength. Its input structure is designed for direct connection to 5-V TTL outputs, while its output voltage swing meets 5-V CMOS VIH/VIL thresholds-even under worst-case process/voltage/temperature corners. No external pull-ups, resistors, or level translators are required for interoperability within 5-V logic domains.