Texas Instruments CY74FCT244DTQC

Overview

CY74FCT244DTQC from Texas Instruments is an octal 3-state noninverting buffer/line driver IC designed for memory address driving, clock distribution, and bus-oriented data transmission. It operates at 4.75–5.25 V, delivers 64 mA sink / 32 mA source output drive, features edge-rate control for noise reduction, supports partial-power-down via Ioff, and is TTL-compatible with matched rise/fall times.

For engineers reviewing the CY74FCT244DTQC datasheet, CY74FCT244DTQC pinout, CY74FCT244DTQC application, or CY74FCT244DTQC equivalent, key selection criteria include propagation delay (≤3.6 ns), 3-state enable timing (tPZH/tPLZ ≤4.8 ns), Ioff leakage (±1 µA at VCC = 0 V), ESD robustness (2000-V HBM), and QSOP-20 package compatibility with high-density PCB layouts.

Technical Context

This device implements dual independent 4-bit noninverting buffers with separate 3-state controls (OEA and OEB), enabling selective bus isolation. Its FCT-family architecture provides bipolar-equivalent speed while reducing power consumption versus legacy TTL, with logic-level compatibility across TTL, NMOS, and CMOS interfaces without external level-shifting components.

The integrated edge-rate control circuitry limits slew rate to suppress simultaneous switching noise, and the Ioff feature actively disables outputs during power-down to prevent backflow current-critical for hot-swap and mixed-voltage system designs where VCC may be unpowered while I/O pins remain active.

Key Specifications

Pinout & Package

Package: 20-pin QSOP (DBQ), 0.150-inch body width, 0.65-mm lead pitch, RoHS-compliant green 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 CY74FCT244ATQCT, CY74FCT244DTQC trades temperature range for faster timing; compared with SN74FCT244QDR, it offers higher board density but requires finer-pitch assembly-making CY74FCT244DTQC optimal for space-constrained, high-speed commercial designs.

Availability

CY74FCT244DTQC is available at Aetrix Electronics and suitable for memory subsystems, clock distribution networks, and industrial bus interfaces requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for CY74FCT244DTQC 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 heritage in high-reliability logic families.

CY74FCT244DTQC belongs to the FCT logic family, engineered for high-speed, low-noise, TTL-compatible digital interfacing in commercial computing, communications, and industrial control systems.

FAQ

What is the maximum propagation delay for CY74FCT244DTQC at 5 V?

The maximum propagation delay (tPLH/tPHL) for CY74FCT244DTQC is 3.6 ns under recommended operating conditions (VCC = 4.75–5.25 V, TA = 0°C to 70°C, CL = 50 pF). This value is specified in the switching characteristics table for the CY74FCT244DT variant and applies directly to CY74FCT244DTQC, which uses the same DBQ package and speed grade.

Does CY74FCT244DTQC support partial-power-down operation?

Yes, CY74FCT244DTQC supports partial-power-down via its Ioff feature. When VCC = 0 V, the outputs are disabled and Ioff leakage is limited to ±1 µA per pin, preventing damaging current backflow from live I/O traces into the unpowered device-enabling safe use in hot-swap and multi-rail systems.

What package type is used for CY74FCT244DTQC?

CY74FCT244DTQC uses a 20-pin QSOP (also labeled SSOP) package with drawing code DBQ, 0.150-inch body width, and 0.65-mm lead pitch. It is RoHS-compliant, green (no Sb/Br), with CU NIPDAU finish and JEDEC MSL Level-2-260°C-1 year moisture sensitivity rating.

Can CY74FCT244DTQC interface directly with 3.3-V logic inputs?

Yes, CY74FCT244DTQC can interface with 3.3-V logic inputs: its typical VOH is 3.3 V at VCC = 5 V and IOH = –32 mA, providing >0.7 V noise margin relative to a 3.3-V receiver's VIH threshold (typically 2.0 V). No level shifter is required for this interface direction.

What is the output drive strength of CY74FCT244DTQC?

CY74FCT244DTQC provides 64 mA maximum sink current (IOL) and 32 mA maximum source current (IOH) per output, measured at VCC = 4.75 V. These values ensure robust signal integrity when driving standard 50-pF loads and multiple TTL or CMOS inputs in bus configurations.