Texas Instruments SN74ABT2244ADBRG4

Overview

SN74ABT2244ADBRG4 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, sinks up to 12 mA per output, features integrated 25-Ω series resistors to suppress overshoot/undershoot, and supports –40°C to 85°C industrial temperature range in a 20-pin SSOP (DB) package.

For engineers reviewing the SN74ABT2244ADBRG4 datasheet, SN74ABT2244ADBRG4 pinout, SN74ABT2244ADBRG4 application, or SN74ABT2244ADBRG4 equivalent, key selection criteria include 3-state bus driving capability, output current rating (12 mA sink), propagation delay (≤4.7 ns typical at 5 V), high-impedance behavior during power-up/down, and compatibility with TTL-level control signals.

Technical Context

This device implements two independent 4-bit noninverting buffer sections (1A→1Y and 2A→2Y), each controlled by a dedicated active-low output-enable (OE) input. Its EPIC-II^B BiCMOS architecture delivers low power dissipation while maintaining TTL-compatible input thresholds (V_IL = 0.8 V, V_IH = 2 V) and rail-to-rail output swing under load.

The integrated 25-Ω series termination on all eight outputs eliminates external resistors for impedance matching on PCB traces, reducing component count and layout complexity. High-impedance state is guaranteed during V_CC ramp from 0–2.1 V, and maintained above 2.1 V when OE is pulled high via external resistor.

Key Specifications

Pinout & Package

SN74ABT2244ADBRG4 uses a 20-pin Shrink Small-Outline Package (SSOP-DB), 7.4 mm × 5.6 mm footprint, 2.0 mm max height, 0.65 mm lead pitch, RoHS-compliant NiPdAu finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT2244N and SN74ABT2244ADWR, SN74ABT2244ADBRG4 offers the smallest PCB footprint (SSOP-DB), best high-frequency signal integrity due to tighter lead inductance, and optimized reflow compatibility for high-volume SMT production-while retaining identical logic behavior and DC specifications.

Availability

SN74ABT2244ADBRG4 is available at Aetrix Electronics and suitable for memory subsystems, industrial backplanes, legacy interface adapters, and test instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT2244ADBRG4 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 over 50 years of innovation in high-reliability logic interfaces and bus technologies.

The ABT logic family-including SN74ABT2244ADBRG4-is engineered for high-speed, low-noise 3-state bus driving in industrial, computing, and communications infrastructure where signal integrity and power efficiency are critical.

FAQ

What is the maximum output sink current specification for SN74ABT2244ADBRG4?

The SN74ABT2244ADBRG4 is rated for 12 mA sink current 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 value is guaranteed across temperature and voltage range, enabling direct drive of multiple TTL inputs or moderate capacitive loads without external buffers. The SN74ABT2244ADBRG4 maintains this rating while incorporating 25-Ω series resistors to manage edge rates and reduce overshoot.

Does SN74ABT2244ADBRG4 require external pull-up resistors on its OE inputs?

Yes-SN74ABT2244ADBRG4 requires external pull-up resistors on 1OE and 2OE to ensure reliable high-impedance state when V_CC exceeds 2.1 V. While the device enters high-Z automatically during power-up/down (0–2.1 V), OE must be held ≥2 V above GND to maintain disable state above that threshold. The minimum resistor value depends on the current-sinking capability of the driving source; TI recommends values between 1 kΩ and 10 kΩ for typical microcontroller GPIOs. The SN74ABT2244ADBRG4 does not include internal pull-ups.

What package type and dimensions does SN74ABT2244ADBRG4 use?

SN74ABT2244ADBRG4 uses a 20-pin Shrink Small-Outline Package (SSOP-DB), with body dimensions of 7.4 mm × 5.6 mm, maximum height of 2.0 mm, and 0.65 mm lead pitch. It complies with JEDEC MO-150, features NiPdAu lead finish, and carries MSL Level-1 (unlimited floor life). The SN74ABT2244ADBRG4 marking is "AA244A", and it ships in 2000-unit tape-and-reel format (330 mm reel diameter, 16.4 mm width).

How does the integrated 25-Ω series resistor in SN74ABT2244ADBRG4 improve signal integrity?

The integrated 25-Ω series resistor in each output of SN74ABT2244ADBRG4 provides source termination for controlled-impedance PCB traces (typically 50–75 Ω), suppressing reflections, overshoot, and undershoot without requiring discrete components. This reduces EMI, improves timing margins, and simplifies layout-especially in point-to-point or short-stub bus configurations. Unlike external resistors, the on-die implementation ensures precise matching and eliminates parasitic inductance from discrete placement, directly enhancing signal fidelity in high-speed digital interfaces using SN74ABT2244ADBRG4.

Is SN74ABT2244ADBRG4 compatible with 3.3 V logic inputs?

Yes-SN74ABT2244ADBRG4 accepts 3.3 V logic-high signals as valid inputs because its V_IH threshold is specified at 2.0 V minimum (over temperature and voltage), well below 3.3 V. Inputs driven by 3.3 V LVTTL or LVCMOS sources meet the VIH requirement without level shifting. However, SN74ABT2244ADBRG4 outputs swing rail-to-rail (0 V to V_CC ≈ 5 V), so interfacing to 3.3 V receivers requires external clamping or voltage translation unless the receiver tolerates 5 V inputs. The SN74ABT2244ADBRG4 itself operates only from 4.5–5.5 V.