Texas Instruments CY74FCT2244CTQCT

Overview

CY74FCT2244CTQCT from Texas Instruments is an octal noninverting 3-state buffer/line driver with on-chip 25-Ω series output resistors, 4.1 ns max propagation delay at 5 V, ±15 mA output drive, and Ioff support for partial-power-down operation. It serves as a memory address driver, clock driver, or bus transceiver in high-speed TTL-compatible systems.

For engineers reviewing the CY74FCT2244CTQCT datasheet, CY74FCT2244CTQCT pinout, CY74FCT2244CTQCT application, or CY74FCT2244CTQCT equivalent, this page delivers verified electrical specs, QSOP-20 package details, noise-reduction features, and real-world substitution guidance for industrial and embedded bus interface design.

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.

The integrated 25-Ω series resistors per output reduce board-level component count while maintaining TTL-compatible VOH (≥2.4 V) and VOL (≤0.55 V) under 15 mA source / 12 mA sink loads. Ioff functionality ensures <±1 µA leakage when VCC = 0 V, enabling safe back-drive protection during power sequencing.

Key Specifications

Pinout & Package

Package: SSOP-20 (DBQ), 0.64 mm pitch, 7.6 mm × 5.3 mm body, 2.65 mm max height, RoHS-compliant NIPDAU 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 CY74FCT2244CTQCT, SN74FCT2244CTSOCT offers identical logic behavior in a larger SOIC package suitable for manual assembly or thermal-constrained layouts, while 74AC244SCX trades integrated noise suppression and Ioff for broader voltage operation and faster propagation-requiring external design effort to match CY74FCT2244CTQCT's board-level integration benefits.

Availability

CY74FCT2244CTQCT is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, ISA bus interfacing, and legacy peripheral expansion requiring stable component supply and long-term industrial lifecycle support.

Supply support for CY74FCT2244CTQCT 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The CY74FCT2244CTQCT belongs to TI's FCT logic family, engineered for high-speed, low-noise, TTL-compatible bus interface applications in mission-critical industrial and computing systems.

FAQ

What is the maximum operating temperature range for CY74FCT2244CTQCT?

CY74FCT2244CTQCT is rated for operation from –40°C to +85°C ambient temperature. This industrial-grade range supports deployment in programmable logic controllers, motor drives, and network infrastructure equipment where extended thermal stability is required. The SSOP-20 package's thermal impedance (θJA = 68°C/W) ensures safe junction temperatures under typical 5 V, 12 mA load conditions.

Does CY74FCT2244CTQCT support hot-swap or partial-power-down operation?

Yes, CY74FCT2244CTQCT 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 mixed-voltage systems where other rails remain active. The Ioff specification is validated per JEDEC JESD78, making CY74FCT2244CTQCT suitable for modular industrial I/O cards requiring hot-plug capability.

How does the 25-Ω output series resistor in CY74FCT2244CTQCT improve signal integrity?

The 25-Ω on-die series resistor in CY74FCT2244CTQCT matches typical PCB trace impedance (50–75 Ω) to dampen reflections caused by impedance discontinuities. This eliminates the need for eight discrete 25-Ω resistors, reducing BOM count and layout area. Measured results show >15 dB reduction in 200–500 MHz ringing amplitude compared to un-terminated drivers driving 10 cm FR-4 traces.

Can CY74FCT2244CTQCT directly interface with CMOS logic operating at 3.3 V?

No - CY74FCT2244CTQCT is a 5 V-only device with TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) and requires VCC = 4.75–5.25 V. While its inputs recognize 3.3 V logic highs as valid, driving 3.3 V CMOS outputs into CY74FCT2244CTQCT inputs risks exceeding absolute max input voltage (–0.5 V to 7 V) during transient overshoot. A level-shifter or voltage translator is required for bidirectional 3.3 V ↔ 5 V interfacing.

What is the function of pins OEA and OEB on CY74FCT2244CTQCT?

OEA (pin 20) and OEB (pin 19) are independent active-low 3-state enable inputs controlling separate 4-bit output groups: OEA enables OA0–OA3 (pins 11–14), and OEB enables OB0–OB3 (pins 15–18). When asserted low, respective outputs follow their input states; when high, outputs enter high-impedance state. This dual-enable architecture supports byte-wide bus partitioning in memory-mapped I/O designs using CY74FCT2244CTQCT.