Texas Instruments SN74ABT2244ANSRE4

Overview

SN74ABT2244ANSRE4 from Texas Instruments is an octal noninverting buffer/line driver with 3-state outputs, designed for memory address and bus-oriented applications. It operates from 4.5 V to 5.5 V, supports –40°C to 85°C ambient, sinks up to 12 mA per output, and features integrated 25-Ω series resistors to suppress overshoot/undershoot in high-speed digital buses.

For engineers reviewing the SN74ABT2244ANSRE4 datasheet, SN74ABT2244ANSRE4 pinout, SN74ABT2244ANSRE4 application, or SN74ABT2244ANSRE4 equivalent, key selection criteria include its 20-pin SOP (NS) package, dual 4-bit independent enable control (1OE/2OE), high-impedance state during power-up/down, and compatibility with TTL-level inputs driving CMOS loads in industrial bus interfaces.

Technical Context

This device implements two independent 4-bit noninverting buffer sections, each with dedicated active-low output-enable (1OE, 2OE). Each output includes on-die 25-Ω series resistance to dampen signal reflections without external termination. The EPIC-II^B BiCMOS process enables low power dissipation while maintaining TTL-compatible input thresholds and 5-V CMOS output drive capability.

It guarantees high-impedance behavior when V_CC is between 0 V and 2.1 V, eliminating bus contention during power sequencing. Output switching times are specified at t_PLH/t_PHL ≤ 4.7 ns and t_PZH/t_PZL ≤ 5.5 ns (V_CC = 5 V, T_A = 25°C, C_L = 50 pF), supporting reliable operation in fast synchronous bus environments.

Key Specifications

Pinout & Package

SN74ABT2244ANSRE4 is supplied in a 20-pin SOP (Small Outline Package), designated NS, with 0.65 mm lead pitch and 7.5 mm × 12.8 mm body dimensions. The package is RoHS-compliant, lead-finished with NiPdAu, and rated MSL Level-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT2244ADBR and SN74ABT2244APWR, SN74ABT2244ANSRE4 offers the best balance of thermal performance (92°C/W), ease of hand-soldering and rework (0.65 mm pitch, 7.5 mm width), and compatibility with legacy SOP footprints - making it ideal for industrial control and test equipment upgrades.

Availability

SN74ABT2244ANSRE4 is available at Aetrix Electronics and suitable for industrial bus interface, memory address buffering, legacy system upgrades, and automated test equipment requiring stable component supply and long-term lifecycle support.

Supply support for SN74ABT2244ANSRE4 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 solutions, with decades of experience in high-reliability industrial and automotive-grade components.

The ABT logic family, including SN74ABT2244ANSRE4, was engineered for high-speed, low-noise bus interfacing in mission-critical industrial systems - emphasizing robustness, predictable timing, and compatibility with mixed-voltage architectures.

FAQ

What is the operating temperature range for SN74ABT2244ANSRE4?

SN74ABT2244ANSRE4 is characterized for operation from –40°C to +85°C ambient temperature. This industrial-grade rating ensures reliable functionality in factory automation, motor drives, and outdoor instrumentation environments where thermal extremes are common. The device maintains full electrical specifications across this range, including propagation delay, drive strength, and high-impedance behavior during power transitions.

Does SN74ABT2244ANSRE4 require external pull-up resistors on its OE pins?

SN74ABT2244ANSRE4 does not require external pull-ups on 1OE or 2OE for basic operation, but they are recommended when V_CC exceeds 2.1 V and OE must be held inactive. Since the device enters high-Z only when V_CC is below 2.1 V, tying OE to V_CC via a pull-up (e.g., 10 kΩ) ensures deterministic disable behavior across the full 4.5–5.5 V supply range. TI specifies minimum pull-up current-sinking capability in the datasheet.

Can SN74ABT2244ANSRE4 drive 50-Ω transmission lines directly?

Yes - SN74ABT2244ANSRE4 integrates 25-Ω series resistors on each output, enabling direct drive of 50-Ω PCB traces without external termination. When paired with a 50-Ω load (e.g., receiver input or controlled-impedance line), the total source impedance matches the line characteristic impedance, minimizing reflections. This eliminates discrete resistors and saves board space in high-speed digital interconnects.

What is the maximum output current rating for SN74ABT2244ANSRE4?

SN74ABT2244ANSRE4 is rated to sink up to 12 mA per output (I_OL) under recommended operating conditions (V_CC = 4.5 V to 5.5 V, T_A = –40°C to +85°C). This drive strength supports fan-out to multiple TTL inputs or termination of short stubs. Simultaneous switching of all eight outputs is permitted, provided total package power dissipation remains within thermal limits for the NS package (θ_JA = 92°C/W).

Is SN74ABT2244ANSRE4 pin-compatible with older 74-series buffers like 74LS244?

SN74ABT2244ANSRE4 shares the same 20-pin SOP (NS) footprint and pinout as 74LS244 and 74F244, enabling mechanical drop-in replacement. However, it is not electrically identical: SN74ABT2244ANSRE4 has higher drive (12 mA vs. 8 mA), faster timing (~4.7 ns vs. ~15 ns), and integrated series resistors. System validation is required for timing closure and noise margin, especially in legacy designs with marginal margins.