Renesas 74FCT2244ATQG

Overview

74FCT2244ATQG from Renesas Electronics (formerly IDT) is a fast CMOS octal buffer/line driver with dual 3-state enable inputs, designed for memory and address bus driving, clock distribution, and bus-oriented transmitter/receiver applications. It features true TTL input/output compatibility (VOH = 3.3 V typ., VOL = 0.3 V typ.), resistor-limited outputs (–15 mA IOH, 12 mA IOL), and operates across –40°C to +85°C industrial temperature range at 5.0 V ±5%.

For engineers reviewing the 74FCT2244ATQG datasheet, 74FCT2244ATQG pinout, 74FCT2244ATQG application, or 74FCT2244ATQG equivalent, key selection criteria include its balanced output drive with current-limiting resistors, low ground bounce, controlled fall times, and SOIC-20/QSOP-20 package compatibility for high-density PCB layouts.

Technical Context

The 74FCT2244ATQG implements an advanced dual-metal CMOS process to deliver TTL-compatible logic levels while maintaining CMOS power efficiency. Its dual independent 3-state enables (OEA, OEB) allow selective control of two 4-bit groups (DA0–DA3/OA0–OA3 and DB0–DB3/OB0–OB3), supporting flexible bus partitioning and bidirectional data flow management.

Output drive incorporates on-die current-limiting resistors to reduce system switching noise, minimize undershoot, and eliminate need for external series termination. Propagation delays are tightly specified (tPLH/tPHL ≤ 4.8 ns, tPZH/tPHZ ≤ 6.2 ns at CL = 50 pF), enabling reliable operation in high-speed address/data paths up to 100+ MHz.

Key Specifications

Pinout & Package

74FCT2244ATQG is packaged in a 20-pin QSOP (Quarter-size Small Outline Package, PCG20), measuring 7.2 mm × 5.3 mm with 0.65 mm pitch. Pin assignment follows JEDEC-standard SOIC-20 layout with dual 4-bit channel organization and shared power/ground rails.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal buffer/line driver applications.

Compared with 74FCT2244CTQG and SN74F244N, the 74FCT2244ATQG delivers superior noise immunity, guaranteed industrial temperature operation, and integrated current limiting-enabling cleaner signal edges, fewer external components, and simplified layout for mission-critical embedded bus interfaces.

Availability

74FCT2244ATQG is available at Aetrix Electronics and suitable for memory subsystems, microcontroller bus expansion, industrial PLC backplanes, and legacy instrumentation interfaces requiring stable component supply across full industrial temperature range.

Supply support for 74FCT2244ATQG 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

Renesas Electronics Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

The 74FCT2244ATQG belongs to Renesas' legacy IDT fast CMOS logic family, engineered specifically for high-reliability, low-noise bus interfacing in industrial control, test equipment, and computing infrastructure where signal integrity and thermal robustness are critical.

FAQ

What is the maximum operating frequency supported by the 74FCT2244ATQG?

The 74FCT2244ATQG does not specify a maximum clock frequency, but its propagation delay (tPLH/tPHL ≤ 4.8 ns) and output transition characteristics support reliable operation in address/data buses running at >100 MHz. System-level timing depends on load capacitance, trace length, and termination; for 50 pF loads, it maintains signal fidelity up to 200 MHz edge rates.

Does the 74FCT2244ATQG require external pull-up or pull-down resistors on its enable pins?

No. The 74FCT2244ATQG OEA and OEB inputs are TTL-compatible with defined VIH (≥2.0 V) and VIL (≤0.8 V) thresholds. When driven directly from CMOS or TTL logic outputs, no external biasing resistors are needed. Floating enables default to HIGH, placing outputs in high-impedance state-safe for hot-swap or power sequencing.

Can the 74FCT2244ATQG be used as a level shifter between 3.3 V and 5 V logic domains?

The 74FCT2244ATQG operates exclusively at 5 V VCC and accepts 3.3 V logic-high inputs (VIH min = 2.0 V), making it suitable for 3.3 V → 5 V unidirectional translation. However, its outputs swing 0–5 V and are not 3.3 V-tolerant; direct connection to 3.3 V receivers requires external clamping or series resistance to avoid overvoltage damage.

What is the purpose of the current-limiting resistors inside the 74FCT2244ATQG outputs?

The internal current-limiting resistors in the 74FCT2244ATQG reduce ground bounce and overshoot/undershoot during switching, enabling clean signal edges without external series termination. They also limit short-circuit current to safe levels (–15 mA IOH, +12 mA IOL), protecting the device and downstream logic during bus contention or wiring faults.

Is the 74FCT2244ATQG RoHS compliant and lead-free?

Yes. The "G" suffix in 74FCT2244ATQG denotes green (lead-free, RoHS-compliant) packaging per Renesas' ordering nomenclature. The QSOP-20 package uses matte tin lead finish and meets JEDEC J-STD-020 moisture sensitivity level 3 (MSL-3), supporting standard reflow profiles without special handling.