Texas Instruments CY74FCT2244CTSOCT

Overview

CY74FCT2244CTSOCT from Texas Instruments is an octal 3-state buffer/line driver with on-chip 25-Ω series output resistors, TTL-compatible input/output levels, 4.1 ns maximum propagation delay (tPLH/tPHL), ±15 mA output drive capability, and Ioff support for partial-power-down operation. It serves as a memory address driver, clock driver, or bus-oriented transmitter/receiver in high-speed digital systems.

For engineers reviewing the CY74FCT2244CTSOCT datasheet, CY74FCT2244CTSOCT pinout, CY74FCT2244CTSOCT application, or CY74FCT2244CTSOCT equivalent, key selection criteria include 3-state control timing (tPZH/tPLZ ≤ 5.8 ns), output termination integration, Ioff-enabled system-level power sequencing, and SOIC-20 package compatibility with legacy FCT logic families.

Technical Context

This device implements dual independent 4-bit noninverting buffers, each controlled by separate 3-state enable inputs (OEA and OEB). Its edge-rate control circuitry shapes output transitions to suppress transmission-line reflections without external termination components.

The integrated 25-Ω series resistors per output reduce board-level noise and component count while maintaining full TTL voltage-level compatibility (VIH = 2 V min, VOL = 0.55 V max at 12 mA). Ioff functionality ensures outputs remain high-impedance when VCC = 0 V, preventing backflow current during partial power-down.

Key Specifications

Pinout & Package

Package: SOIC-20 (DW package drawing), 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 CY74FCT2244TTSOCT, the CY74FCT2244CTSOCT delivers 35% faster timing and guaranteed 25-Ω termination; versus SN74F244N, it adds integrated termination and Ioff - critical for modern industrial backplane reliability without increasing board area.

Availability

CY74FCT2244CTSOCT is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and industrial I/O expansion requiring stable component supply, long-term industrial lifecycle support, and RoHS-compliant SOIC packaging.

Supply support for CY74FCT2244CTSOCT 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 delivering analog and embedded processing solutions, with leadership in logic, power management, and precision analog technologies.

The CY74FCT2244CTSOCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible digital interfacing in industrial, communications, and computing infrastructure.

FAQ

What is the maximum operating frequency supported by CY74FCT2244CTSOCT?

The CY74FCT2244CTSOCT does not specify a maximum operating frequency in its datasheet; instead, it guarantees 4.1 ns maximum propagation delay (tPLH/tPHL) and 5.8 ns maximum 3-state enable/disable times (tPZH/tPLZ). These parameters support reliable operation in digital systems with clock periods ≥10 ns (i.e., up to 100 MHz fundamental timing), assuming proper PCB layout, termination, and load capacitance ≤50 pF per output.

Does CY74FCT2244CTSOCT require external pull-up or pull-down resistors on its control inputs?

No, CY74FCT2244CTSOCT does not require external pull-up or pull-down resistors on OEA or OEB. Its TTL-compatible inputs have defined VIH (≥2 V) and VIL (≤0.8 V) thresholds, and internal input leakage is limited to ±1 µA. However, TI recommends holding all unused inputs at VCC or GND per recommended operating conditions to prevent floating nodes and ensure deterministic operation of the CY74FCT2244CTSOCT.

Can CY74FCT2244CTSOCT be used with 3.3-V logic systems?

CY74FCT2244CTSOCT is specified only for 5-V operation (VCC = 4.75–5.25 V) and TTL-level interfaces. Its inputs are not 5-V tolerant when driven from 3.3-V sources - VIH minimum is 2.0 V, but driving it from 3.3-V logic may cause marginal or unreliable switching. For 3.3-V systems, use a dedicated 3.3-V buffer such as SN74LVC244A; the CY74FCT2244CTSOCT must be used in 5-V domains only.

How does the 25-Ω on-chip series resistor in CY74FCT2244CTSOCT improve signal integrity?

The 25-Ω on-chip series resistor in CY74FCT2244CTSOCT matches typical PCB trace impedance (50–75 Ω) in source-series termination configurations. When placed at the driver output, it dampens signal reflections caused by impedance mismatches at the receiver end, reducing ringing and overshoot. This allows clean signal edges on traces up to ~15 cm without external resistors - directly improving setup/hold timing margins and EMI performance in the CY74FCT2244CTSOCT application.

Is CY74FCT2244CTSOCT pin-compatible with older 74F244 devices?

Yes, CY74FCT2244CTSOCT is functionally and pinout-compatible with standard 74F244 and 74LS244 devices in SOIC-20 packages. The pin assignments (OEA, OA0–OA3, GND, DA0–DA3, VCC, DB0–DB3, OEB, OB0–OB3) match industry-standard 244 logic layouts. However, note that CY74FCT2244CTSOCT includes added features - on-chip 25-Ω resistors and Ioff - not present in basic 74F244, so designs benefit from enhanced noise immunity and power sequencing without footprint changes.