Texas Instruments SN74ABT244ADWRG4

Overview

SN74ABT244ADWRG4 from Texas Instruments is an octal noninverting 3-state buffer/line driver in SOIC-20 (DW) package, operating at 4.5–5.5 V with ±32-mA high-drive outputs, 4.1-ns max propagation delay, and −40°C to 85°C industrial temperature range. It enables bidirectional bus interfacing in memory address drivers, clock distribution networks, and data bus receivers/transmitters.

For engineers reviewing the SN74ABT244ADWRG4 datasheet, SN74ABT244ADWRG4 pinout, SN74ABT244ADWRG4 application, or SN74ABT244ADWRG4 equivalent, key selection criteria include 3-state output enable timing (tPZL/tPHZ ≤ 6.1 ns), latch-up immunity (>500 mA), ESD protection (>2000 V HBM), and compatibility with 5-V TTL/CMOS logic families.

Technical Context

This BiCMOS device implements two independent 4-bit noninverting buffers, each with dedicated active-low output-enable (OE) control. Outputs enter high-impedance state when OE is high, ensuring clean bus isolation during power sequencing.

Its EPIC-II^B architecture delivers low ground bounce (<1 V VOLP), symmetrical drive strength (−32 mA IOH / +64 mA IOL), and input hysteresis (100 mV) for noise immunity on shared signal lines.

Key Specifications

Pinout & Package

SN74ABT244ADWRG4 uses a 20-pin SOIC (DW) package measuring 12.8 mm × 7.5 mm × 2.35 mm (max height), RoHS-compliant with NiPdAu lead finish and moisture sensitivity level (MSL) 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC244APWR and SN74AHCT244N, SN74ABT244ADWRG4 uniquely balances 5-V operation, high drive strength, and sub-5-ns timing-making it optimal for upgrading legacy 5-V systems requiring signal integrity under heavy capacitive loads.

Availability

SN74ABT244ADWRG4 is available at Aetrix Electronics and suitable for industrial automation, telecommunications infrastructure, and legacy system upgrades requiring stable component supply and long-term obsolescence mitigation.

Supply support for SN74ABT244ADWRG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions with broad industrial, automotive, and communications reach.

The ABT logic family was engineered for high-speed, high-drive 5-V bus interface applications-delivering superior noise immunity, latch-up resistance, and thermal performance over earlier TTL and LSTTL generations.

FAQ

What is the maximum output current rating for SN74ABT244ADWRG4?

The SN74ABT244ADWRG4 supports −32 mA high-level output current (IOH) and +64 mA low-level output current (IOL) per channel at VCC = 5 V and TA = 25°C. These values ensure reliable drive into multiple TTL loads or moderate PCB trace capacitance without signal degradation. Absolute maximum ratings allow brief peak currents up to 128 mA in the low state, but continuous operation should remain within recommended limits to maintain timing and thermal stability.

Can SN74ABT244ADWRG4 be used in 3.3-V systems?

No, SN74ABT244ADWRG4 is not rated for 3.3-V operation. Its recommended supply voltage is strictly 4.5 V to 5.5 V, and input thresholds are optimized for 5-V TTL/CMOS logic families. Using it below 4.5 V risks undefined output states, increased propagation delay, and potential failure to meet VOH/VOL specifications. For 3.3-V systems, consider SN74LVC244A instead.

How should unused inputs be handled on SN74ABT244ADWRG4?

Unused inputs on SN74ABT244ADWRG4 must be held static-either tied to VCC or GND-to prevent floating nodes that cause excessive ICC, oscillation, or ESD susceptibility. This requirement applies to all A-inputs and OE inputs. Leaving them unconnected violates the recommended operating conditions and may result in unpredictable output behavior or accelerated device aging.

What is the purpose of the input hysteresis in SN74ABT244ADWRG4?

The 100 mV input hysteresis in SN74ABT244ADWRG4 improves noise immunity on both data (A) and control (OE) inputs by creating distinct voltage thresholds for rising and falling transitions. This prevents chatter or metastability when signals traverse the logic threshold region in electrically noisy environments-such as industrial motor drives or switch-mode power supply proximity-ensuring deterministic output switching even with slow or noisy input edges.

Does SN74ABT244ADWRG4 require external pull-up resistors on OE pins?

Yes, to guarantee high-impedance outputs during power-up or power-down sequences, OE pins on SN74ABT244ADWRG4 should be tied to VCC through a pull-up resistor. The minimum value depends on the current-sinking capability of the driving source; TI recommends ≥10 kΩ for typical microcontroller GPIOs. This ensures outputs remain safely disabled until firmware explicitly asserts OE low, preventing bus contention or unintended writes.