Texas Instruments SN74ABT2244N

Overview

SN74ABT2244N from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It features 25-Ω integrated series output resistors, ±12 mA output drive capability, and operates over –40°C to 85°C at 4.5–5.5 V supply. Used in high-density data bus interfaces where controlled edge rates and low ground bounce are critical.

For engineers reviewing the SN74ABT2244N datasheet, SN74ABT2244N pinout, SN74ABT2244N application, or SN74ABT2244N equivalent, key selection criteria include 3-state bus driving capability, integrated 25-Ω series termination, output current rating (IOL = 12 mA), and compatibility with 5-V TTL/CMOS logic systems.

Technical Context

This device implements two independent 4-bit noninverting buffer sections, each with a dedicated active-low output-enable (OE) input. Each output includes on-die 25-Ω series resistance to suppress overshoot/undershoot without external components.

The EPIC-II^B BiCMOS process enables low power dissipation while maintaining TTL-compatible input thresholds (VIL = 0.8 V, VIH = 2 V) and fast switching (tPLH/tPHL ≤ 5.3 ns at 5 V, CL = 50 pF). Ground bounce (VOLP) remains below 1 V under typical conditions.

Key Specifications

Pinout & Package

SN74ABT2244N is housed in a 20-pin plastic dual in-line package (PDIP-N), with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch (2.54 mm), compatible with standard DIP sockets and PCB footprints.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal 3-state buffer applications.

Compared with SN74ABT2240N, SN74ABT2244N preserves signal polarity-critical for address/data integrity-while matching all timing, drive, and thermal specs. Against SN74LVC244APWR, SN74ABT2244N delivers native 5-V compatibility, integrated termination, and proven noise immunity in legacy industrial bus designs.

Availability

SN74ABT2244N is available at Aetrix Electronics and suitable for memory subsystems, industrial control backplanes, legacy instrumentation interfaces, and 5-V bus expansion modules requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT2244N 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 specializing in analog, embedded processing, and logic technologies with over 50 years of innovation in industrial, automotive, and communications markets.

The ABT logic family-including SN74ABT2244N-was engineered for high-speed, low-noise 5-V bus interfacing in memory, clock, and data-path applications where signal integrity and drive strength are critical.

FAQ

What is the recommended power-up sequence for SN74ABT2244N to avoid bus contention?

During power-up, OE pins (pins 1 and 11) must be held high via pull-up resistors to ensure outputs remain in high-impedance state until VCC stabilizes. TI specifies minimum pull-up resistance based on driver sink capability; a 4.7-kΩ resistor to VCC is commonly used. This prevents unintended driving before system control logic initializes, protecting connected devices from bus conflicts. The SN74ABT2244N's design mandates this sequence to guarantee safe 3-state entry at power-on.

Does SN74ABT2244N support hot-swap operation on live 5-V buses?

SN74ABT2244N is not rated for hot-swap insertion into powered systems. Its absolute maximum ratings allow VCC = –0.5 V to 7 V and IO = 30 mA, but the device lacks built-in bus-fault protection, current limiting, or power sequencing logic. While its 25-Ω series resistors help limit transient currents, sustained hot-swap events risk latch-up or damage due to uncontrolled voltage ramping. For hot-swap applications, dedicated hot-swap controllers or buffers with IEC 61000-4-2 ESD and fault protection should be used alongside SN74ABT2244N.

Can SN74ABT2244N drive a 50-Ω transmission line directly?

Yes-SN74ABT2244N can drive a 50-Ω transmission line directly in point-to-point configurations. Its integrated 25-Ω series output resistor, combined with typical PCB trace impedance (~50 Ω), forms a near-impedance-matched source termination that suppresses reflections. This eliminates discrete resistors and reduces component count. However, for multi-drop or stubbed topologies, additional termination or buffering may be required, as the SN74ABT2244N's drive strength (12 mA) limits usable trace length and fan-out under loaded conditions.

What is the maximum capacitive load SN74ABT2244N can drive while maintaining specified timing?

SN74ABT2244N's switching characteristics (e.g., tPLH ≤ 5.3 ns) are characterized at CL = 50 pF. Exceeding this load increases propagation delay nonlinearly and degrades edge rates. At 100 pF, delays increase by ~30–40%, and ground bounce rises significantly. For reliable operation within datasheet timing specs, total load-including trace capacitance, input capacitance of driven devices (Ci = 3 pF typical), and probe/jig effects-must stay ≤50 pF. If higher capacitance is unavoidable, derating timing margins or adding intermediate buffering is advised.

Is SN74ABT2244N RoHS-compliant and lead-free?

SN74ABT2244N is obsolete per TI's packaging data and was manufactured prior to full RoHS implementation. Its PDIP-N package uses leaded solder finish and does not meet current RoHS Directive (2011/65/EU) requirements for lead content (<0.1% by weight). TI lists it as "OBSOLETE" with no Pb-Free (RoHS) conversion plan defined. For new designs requiring RoHS compliance, consider functionally equivalent alternatives like SN74LVC244A (3.3 V) or SN74AHCT244N (5 V, RoHS-compliant), verifying pinout and timing compatibility before substitution. SN74ABT2244N remains viable only for legacy repair or non-regulated applications.