onsemi 74ABT2244CMSAX

Overview

74ABT2244CMSAX from Fairchild Semiconductor is an octal non-inverting buffer/line driver with integrated 25Ω series output resistors, designed for driving capacitive bus loads in memory, address, and clock distribution systems. It operates at 4.5V–5.5V, delivers 32mA output drive strength, supports 3-state outputs via dual active-low enables (OE1/OE2), and exhibits propagation delays as low as 1.0ns.

For engineers reviewing the 74ABT2244CMSAX datasheet, pinout, applications, or equivalent options, key selection criteria include its built-in 25Ω output termination, guaranteed latchup protection, hot-insertion capability, and compatibility with JEDEC MO-150 SSOP-20 packaging for high-density PCB layouts.

Technical Context

The 74ABT2244CMSAX implements two independent 4-bit groups (I0–I3/O0–O3 and I4–I7/O4–O7), each controlled by a dedicated active-low output enable (OE1, OE2). Its output stage integrates 25Ω series resistors to dampen signal reflections without external components.

It features high-impedance, glitch-free bus loading across full power-up/down cycles and meets JEDEC J-STD-020B Pb-free requirements. Input thresholds are VIH ≥ 2.0V and VIL ≤ 0.8V, ensuring TTL-compatible logic interfacing under industrial temperature range (–40°C to +85°C).

Key Specifications

Pinout & Package

74ABT2244CMSAX is housed in a 20-lead Shrink Small Outline Package (SSOP), JEDEC MO-150 compliant, with 0.65mm lead pitch and 5.3mm body width. The package supports fine-pitch automated assembly and thermal performance suitable for dense logic applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT2244DBR and 74LVT2244MTCX, the 74ABT2244CMSAX uniquely combines 5V operation, integrated 25Ω termination, and industrial temperature rating in a JEDEC MO-150 SSOP package-making it optimal for legacy 5V bus designs requiring zero-layout changes for signal integrity.

Availability

74ABT2244CMSAX is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, clock distribution networks, and bus-oriented transmitter/receiver interfaces requiring stable component supply and long-term obsolescence management.

Supply support for 74ABT2244CMSAX 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

Fairchild Semiconductor was a U.S.-based semiconductor company specializing in analog and mixed-signal ICs, acquired by ON Semiconductor in 2016; its ABT logic family remains widely deployed in industrial and computing infrastructure.

The 74ABT2244CMSAX belongs to Fairchild's Advanced BiCMOS Technology (ABT) logic series, engineered for high-speed, low-noise 5V bus interfacing with enhanced robustness against ESD, latchup, and hot-insertion stress.

FAQ

What is the function of the 25Ω series resistors in the 74ABT2244CMSAX outputs?

The 25Ω series resistors in the 74ABT2244CMSAX outputs are monolithically integrated to dampen signal reflections on transmission lines, reducing ringing and overshoot without requiring external termination components. This feature simplifies PCB layout and improves signal integrity in high-speed bus applications such as memory addressing and clock distribution, directly benefiting designs using the 74ABT2244CMSAX in 5V systems.

Does the 74ABT2244CMSAX support hot-plug operation?

Yes, the 74ABT2244CMSAX provides nondestructive hot-insertion capability, meaning it can be safely inserted into a live system without damaging the device or causing bus contention. This is enabled by its high-impedance, glitch-free behavior during power-up/down cycles and is explicitly guaranteed in the datasheet-making the 74ABT2244CMSAX suitable for modular backplane and field-replaceable unit designs.

What is the maximum output drive current specification for the 74ABT2244CMSAX?

The 74ABT2244CMSAX specifies a minimum output sink current (IOL) of 15mA at VOL ≤ 0.8V and a minimum output source current (IOH) of 32mA at VOH ≥ 2.0V. These values reflect its ability to drive heavy capacitive loads such as multiple CMOS inputs or unterminated bus stubs, confirming its suitability as a robust line driver in the 74ABT2244CMSAX application space.

How does the dual output enable (OE1/OE2) architecture benefit system design with the 74ABT2244CMSAX?

The dual active-low output enables (OE1 and OE2) in the 74ABT2244CMSAX independently control two 4-bit output groups (O0–O3 and O4–O7), allowing segmented bus access and reduced contention risk. This architecture supports flexible timing schemes-for example, enabling upper and lower bytes at different times-enhancing control granularity in the 74ABT2244CMSAX's role as a programmable bus interface component.

Is the 74ABT2244CMSAX RoHS-compliant and Pb-free?

Yes, the 74ABT2244CMSAX is manufactured in a Pb-free package compliant with JEDEC J-STD-020B, as confirmed in the official Fairchild datasheet revision 1.4. The "X" suffix in the part number denotes tape-and-reel packaging and Pb-free construction, making the 74ABT2244CMSAX suitable for modern RoHS-constrained production environments without requiring redesign or requalification.