Texas Instruments CY74FCT2244CTSOC

Overview

CY74FCT2244CTSOC from Texas Instruments is an octal noninverting 3-state buffer/line driver with on-chip 25-Ω series output resistors, TTL-compatible input/output levels, and Ioff partial-power-down support. It delivers 4.1 ns typical propagation delay (tPLH/tPHL), ±15 mA output source/sink capability, and operates across –40°C to +85°C for memory address, clock, and bus-transmission applications.

For engineers reviewing the CY74FCT2244CTSOC datasheet, CY74FCT2244CTSOC pinout, CY74FCT2244CTSOC application, or CY74FCT2244CTSOC equivalent, key selection criteria include its 20-pin SOIC package, 25-Ω integrated termination, dual 3-state enable control (OEA/OEB), and compatibility with TTL/NMOS/CMOS logic families without external components.

Technical Context

This device implements two independent 4-bit noninverting buffer sections, each controlled by separate 3-state enable inputs (OEA and OEB). Each output incorporates a 25-Ω series resistor to suppress transmission-line reflections in high-speed routing.

It features edge-rate control circuitry to reduce switching noise, supports Ioff protection during partial power-down (preventing backflow current when VCC = 0 V), and meets JESD22 ESD ratings including 2000-V HBM - all while maintaining full TTL-level interface compatibility at 5-V supply.

Key Specifications

Pinout & Package

Package: 20-pin SOIC (DW), 7.6 mm × 12.8 mm body, 1.27 mm pitch, 2.65 mm max height, RoHS-compliant NiPdAu 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 SN74FCT2244CTSO, CY74FCT2244CTSOC offers identical performance and fit; versus 74LCX244WM, it provides native 5-V operation, integrated termination, and dual-enable flexibility - critical for industrial bus and memory interface reliability.

Availability

CY74FCT2244CTSOC is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and parallel bus transceiver applications requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant manufacturing.

Supply support for CY74FCT2244CTSOC 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and communications markets.

CY74FCT2244CTSOC belongs to the FCT logic family - designed specifically for high-speed, low-noise, 5-V TTL-compatible digital interfacing in mission-critical industrial and computing systems.

FAQ

What is the maximum propagation delay of the CY74FCT2244CTSOC at 5 V?

The CY74FCT2244CTSOC has a maximum propagation delay of 4.1 ns (tPLH and tPHL) under recommended operating conditions (VCC = 4.75 V to 5.25 V, TA = –40°C to +85°C). This value is specified for the CY74FCT2244CT variant in the official TI datasheet SCCS074 and reflects worst-case timing across temperature and voltage extremes - making CY74FCT2244CTSOC suitable for sub-250 MHz synchronous bus applications.

Does the CY74FCT2244CTSOC support partial power-down operation?

Yes, the CY74FCT2244CTSOC supports partial power-down via its Ioff feature. When VCC = 0 V, the Ioff circuitry limits current flow to ±1 µA even if input/output voltages reach up to 4.5 V - preventing damaging backflow currents during hot-swap or mixed-power-rail scenarios. This behavior is explicitly characterized in the datasheet's electrical characteristics table and applies directly to CY74FCT2244CTSOC in its SOIC package.

What is the purpose of the 25-Ω output series resistors in the CY74FCT2244CTSOC?

The 25-Ω output series resistors in the CY74FCT2244CTSOC are integrated on-die to dampen transmission-line reflections on PCB traces, especially in high-speed memory or clock routing. They reduce ringing and overshoot without requiring external components, lowering BOM cost and layout complexity. This design feature is confirmed in the device description and electrical specifications (ROUT = 20–40 Ω) for CY74FCT2244CTSOC and is active on all eight outputs.

How many independent 3-state enable inputs does the CY74FCT2244CTSOC have?

The CY74FCT2244CTSOC has two independent active-low 3-state enable inputs: OEA (pin 20) controls outputs OA0–OA3, and OEB (pin 18) controls outputs OB0–OB3. This dual-enable architecture allows selective disabling of either 4-bit group - essential for bidirectional bus control and multi-drop timing isolation. The function table and logic diagram in the CY74FCT2244CTSOC datasheet confirm this configuration.

Is the CY74FCT2244CTSOC pin-compatible with standard TTL octal buffers like the 74LS244?

Yes, the CY74FCT2244CTSOC is functionally and pin-compatible with the 74LS244 and other industry-standard octal 3-state buffers. Its pinout matches the SOIC-20 footprint of the 74LS244, and it maintains TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max) and output drive levels (VOH ≥ 2.4 V, VOL ≤ 0.55 V). However, CY74FCT2244CTSOC adds integrated 25-Ω resistors and Ioff - enhancements not present in 74LS244 - making it a direct upgrade without PCB changes.