Renesas 74FCT3244ASOG8

Overview

74FCT3244ASOG8 from Renesas Electronics is a 3.3V CMOS octal buffer/line driver with dual-nibble 3-state control, 4.8 ns max propagation delay (FCT3244A version), ±60 mA output drive, and industrial temperature range (–40°C to +85°C). It serves as a memory address/data driver or bus transmitter in industrial control backplanes.

For engineers reviewing the 74FCT3244ASOG8 datasheet, 74FCT3244ASOG8 pinout, 74FCT3244ASOG8 application, or 74FCT3244ASOG8 equivalent, key selection criteria include 3-state enable timing (tPZH/tPHZ ≤ 6.2 ns), rail-to-rail output swing, low static power (0.4 μW typ.), and SOIC-20 package compatibility with legacy 74-series layouts.

Technical Context

The 74FCT3244ASOG8 implements two independent 4-bit groups (1A–1Y and 2A–2Y), each controlled by its own active-low 3-state enable (1OE, 2OE). Inputs feature hysteresis (150 mV typ.) for noise immunity on noisy bus lines.

It operates across VCC = 2.7V–3.6V, with guaranteed logic levels at VIH ≥ 2.0V and VIL ≤ 0.8V. Output drive capability is asymmetric: IOL = +90 mA (max) at VOL ≤ 0.2 V, IOH = –60 mA (max) at VOH ≥ 2.4 V under VCC = 3.0 V conditions.

Key Specifications

Pinout & Package

74FCT3244ASOG8 is supplied in a 20-pin SOIC package (PSG20 footprint, 0.300" body width, 1.27 mm pitch). Pinout follows standard 74-series dual-nibble layout with separate enables per nibble.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74FCT244NSR and 74LVC244APW, the 74FCT3244ASOG8 delivers superior noise immunity via input hysteresis, higher output current for transmission-line driving, and guaranteed operation down to 2.7V-making it optimal for ruggedized industrial bus interfaces where reliability outweighs marginal speed gains.

Availability

74FCT3244ASOG8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, memory subsystems, and legacy bus translation requiring stable component supply across extended temperature and voltage ranges.

Supply support for 74FCT3244ASOG8 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 specializing in microcontrollers, analog, power, and timing solutions for automotive, industrial, and infrastructure markets.

The 74FCT3244ASOG8 belongs to Renesas' legacy FCT logic family, engineered for high-speed, low-power, industrial-grade bus interface applications with robust ESD and voltage tolerance.

FAQ

What is the maximum operating frequency supported by the 74FCT3244ASOG8?

The 74FCT3244ASOG8 does not specify a maximum clock frequency directly, but its 4.8 ns maximum propagation delay (tPLH/tPHL) supports reliable operation with signal periods ≥ 10 ns-equivalent to a toggle rate up to ~100 MHz on well-terminated lines. Actual usable frequency depends on board layout, load capacitance, and termination; Renesas characterizes timing at CL = 50 pF and RL = 500 Ω.

Does the 74FCT3244ASOG8 support 5V-tolerant inputs?

Yes, the 74FCT3244ASOG8 supports 5V-tolerant inputs: absolute maximum rating for input terminals is –0.5 V to +7 V, and VIH is guaranteed at 2.0 V minimum-allowing direct connection to 5V TTL outputs without level shifters. This makes the 74FCT3244ASOG8 suitable for mixed-voltage industrial systems.

What is the purpose of the dual 3-state enable pins (1OE and 2OE) on the 74FCT3244ASOG8?

The 74FCT3244ASOG8 features two independent active-low 3-state enables (1OE for Y1–Y4, 2OE for Y5–Y8) to support dual-nibble bus control. This allows partial bus activation-for example, enabling only the lower byte during address latching while holding the upper byte in high-impedance-reducing contention and power during multi-cycle transfers in the 74FCT3244ASOG8.

Can the 74FCT3244ASOG8 be used in place of older 74F244 devices?

Yes, the 74FCT3244ASOG8 is a pin-compatible and functionally enhanced replacement for 74F244 in SOIC-20 packages. It offers lower power (0.4 μW vs. ~20 mW), faster timing (4.8 ns vs. ~10 ns), and improved noise immunity via input hysteresis-while maintaining identical pinout, logic behavior, and DC characteristics required for drop-in upgrades in existing 74F244-based designs.

What package type and dimensions does the 74FCT3244ASOG8 use?

The 74FCT3244ASOG8 uses a standard 20-pin SOIC package (PSG20 code), 0.300" wide body, 1.27 mm lead pitch, and JEDEC MS-013 compliant outline. Its footprint matches legacy 74-series SOIC layouts, enabling direct replacement without PCB redesign. The "8" suffix denotes tape-and-reel packaging for automated assembly.