Texas Instruments CY74FCT2244TSOCT

Overview

CY74FCT2244TSOCT 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, 6.5 ns max propagation delay at 5 V, ±15 mA output drive, and I_off support for partial-power-down operation. It serves as a memory address driver, clock driver, or bus transmitter in high-speed digital systems.

For engineers reviewing the CY74FCT2244TSOCT datasheet, CY74FCT2244TSOCT pinout, CY74FCT2244TSOCT application, or CY74FCT2244TSOCT equivalent, key selection criteria include its 25-Ω integrated termination, 3-state control logic (dual OE inputs), -40°C to +85°C industrial temperature range, SOIC-20 package, and compatibility with TTL/NMOS/CMOS interfaces without external components.

Technical Context

This device implements dual independent 4-bit buffer sections, each controlled by separate active-low output-enable inputs (OEA and OEB). Each output features edge-rate control circuitry and integrated 25-Ω series resistors to suppress transmission-line reflections-eliminating need for discrete termination resistors on PCBs.

It operates across 4.75–5.25 V supply, supports I_off protection during partial power-down (preventing backflow current when V_CC = 0 V), and meets JESD22 ESD ratings: 2000-V HBM, 200-V MM, and 1000-V CDM-enabling robust use in mixed-voltage system interconnects.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW package drawing), 7.6 mm × 12.8 mm body, 1.27 mm lead 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 SN74FCT2244NSR, CY74FCT2244TSOCT trades 2.1 ns of speed for broader noise margin and relaxed layout; versus 74ACT244SCX, it delivers superior signal integrity via integrated termination and lower ground bounce-critical in high-density industrial backplanes.

Availability

CY74FCT2244TSOCT is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, backplane data transceivers, and industrial I/O bus interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for CY74FCT2244TSOCT 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 experience in high-reliability industrial and automotive IC design.

The CY74FCT2244TSOCT belongs to TI's FCT logic family-engineered for noise-immune, low-power 5-V TTL-compatible interfacing in industrial control, communications infrastructure, and computing systems.

FAQ

What is the maximum operating frequency supported by CY74FCT2244TSOCT?

CY74FCT2244TSOCT does not specify a maximum operating frequency directly, but its 6.5 ns maximum propagation delay (t_PLH/t_PHL) supports reliable operation in bus systems up to approximately 150 MHz under typical load conditions (CL = 50 pF). Actual usable frequency depends on system-level timing margins, trace length, and termination quality-CY74FCT2244TSOCT's integrated 25-Ω resistors help maintain signal fidelity at these speeds.

Does CY74FCT2244TSOCT require external pull-up or pull-down resistors on its inputs?

No, CY74FCT2244TSOCT does not require external pull-up or pull-down resistors on its inputs. Its TTL-compatible input thresholds (V_IL ≤ 0.8 V, V_IH ≥ 2.0 V) ensure proper logic recognition with standard CMOS or TTL outputs. However, TI recommends holding all unused inputs at V_CC or GND to prevent floating nodes and ensure predictable operation-this is a design best practice, not a requirement for basic functionality of CY74FCT2244TSOCT.

Can CY74FCT2244TSOCT be used with 3.3-V logic systems?

CY74FCT2244TSOCT is a 5-V-only device (V_CC = 4.75–5.25 V) and is not designed for direct interface with 3.3-V logic. Its inputs tolerate up to 5.25 V but do not recognize 3.3-V logic highs as valid TTL-high signals (V_IH min = 2.0 V, but 3.3-V outputs may fall below this under load). To interface with 3.3-V systems, level-shifting circuitry or a 3.3-V-compatible buffer such as SN74LVC244A must be used alongside CY74FCT2244TSOCT.

What is the purpose of the dual output-enable inputs (OEA and OEB) on CY74FCT2244TSOCT?

The dual active-low output-enable inputs (OEA and OEB) on CY74FCT2244TSOCT independently control two groups of four outputs (OA0–OA3 and OB0–OB3). This allows selective 3-state isolation of two distinct 4-bit data paths-enabling applications like split-bus arbitration, staggered enable timing, or independent peripheral addressing. Unlike single-OE buffers, CY74FCT2244TSOCT provides granular control without requiring additional logic gates or multiplexers.

Is CY74FCT2244TSOCT pin-compatible with older 74LS244 devices?

CY74FCT2244TSOCT is functionally compatible with 74LS244 but not fully pin-compatible in all configurations. Both use SOIC-20 packages and share identical pin numbering for data inputs (pins 1–4, 5–8), outputs (11–14, 15–18), V_CC (20), and GND (9). However, CY74FCT2244TSOCT uses dual OE inputs (pins 10 and 19), whereas 74LS244 has a single OE (pin 1). Direct replacement requires board-level modification to route the second OE signal or tie OEB permanently low-CY74FCT2244TSOCT's enhanced feature set necessitates minor schematic adaptation.