Texas Instruments SN74ABT2244ANS

Overview

SN74ABT2244ANS 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 temperature, features integrated 25-Ω output series resistors, and delivers 12 mA sink capability per output - enabling direct interface with high-speed TTL and CMOS buses in industrial control backplanes.

For engineers reviewing the SN74ABT2244ANS datasheet, SN74ABT2244ANS pinout, SN74ABT2244ANS application, or SN74ABT2244ANS equivalent, key selection criteria include its 3-state enable timing (tPZL = 7.3 ns max), low ground bounce (VOLP < 1 V), latch-up immunity (>500 mA), and compatibility with standard SOIC-20 (NS package) PCB footprints.

Technical Context

This device implements dual 4-bit noninverting buffers with independent active-low 3-state enable inputs (1OE, 2OE), each controlling four outputs (Y1–Y4). Its EPIC-II^B BiCMOS process enables high-speed switching (tPLH/tPHL ≤ 4.7 ns) while maintaining TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V) and low static current (ICC ≤ 30 mA).

The output stage integrates 25-Ω series termination to suppress signal reflections without external components, and the power-up/down high-impedance behavior (active below 2.1 V VCC) ensures bus isolation during supply ramping - critical for hot-swap and multi-rail system designs.

Key Specifications

Pinout & Package

SOP-20 (NS) package: 12.8 mm × 7.5 mm body, 1.75 mm height, 0.635 mm lead pitch, gull-wing leads, 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 SN74ABT2244ANS, the DW variant offers easier manual soldering and higher thermal mass, while the PW variant saves board area and weight - all three share identical logic behavior, timing, and DC characteristics, differing only in mechanical form factor and thermal performance.

Availability

SN74ABT2244ANS is available at Aetrix Electronics and suitable for industrial control backplanes, memory subsystems, and digital I/O expansion requiring stable component supply across extended product lifecycles.

Supply support for SN74ABT2244ANS 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 for industrial, automotive, and communications markets.

The SN74ABT2244ANS belongs to TI's ABT logic family, engineered for high-speed, low-noise bus interfacing in industrial and computing systems where signal integrity and robustness are critical.

FAQ

What is the maximum operating voltage for SN74ABT2244ANS?

The absolute maximum supply voltage for SN74ABT2244ANS is 7 V, but the recommended operating range is strictly 4.5 V to 5.5 V per the datasheet. Operating outside this window risks parametric shift or accelerated wear-out; sustained use above 5.5 V voids TI's warranty and may cause permanent damage to the EPIC-II^B BiCMOS output stages.

Does SN74ABT2244ANS require external pull-up resistors on OE pins?

Yes - to guarantee high-impedance state above 2.1 V VCC, OE pins must be pulled up to VCC via external resistors. The minimum value depends on the driving source's sink capability; TI specifies that the resistor must not exceed the current-sinking limit of the preceding driver (e.g., ≤10 kΩ for typical 1-mA GPIO sinks). SN74ABT2244ANS itself does not integrate internal pull-ups.

Can SN74ABT2244ANS drive 50-Ω transmission lines directly?

Yes - each output incorporates a 25-Ω series resistor, enabling matched driving of 50-Ω PCB traces without external components. This design reduces signal reflections and overshoot, verified by TI's characterization showing VOLP < 1 V under full-load switching. For optimal results, maintain controlled-impedance routing and minimize stub lengths.

What is the thermal resistance (θJA) of the SN74ABT2244ANS package?

The SOP-20 (NS) package used by SN74ABT2244ANS has a typical junction-to-ambient thermal resistance of approximately 105°C/W under JEDEC-standard conditions (1-layer board, 1-in² copper pad). This value is higher than SOIC (DW: 97°C/W) and TSSOP (PW: 128°C/W), reflecting its intermediate thermal performance - adequate for industrial ambient temperatures up to 85°C with moderate power dissipation.

Is SN74ABT2244ANS pin-compatible with older 74-series buffers like SN74LS244?

No - although both are octal 3-state noninverting buffers in 20-pin packages, SN74ABT2244ANS uses a different pinout: OE controls are on Pins 1 and 19, while SN74LS244 places them on Pins 1 and 19 only in the N package but with reversed group assignments. Electrical differences (ABT's 5-V-only operation vs. LS's wider VCC tolerance) and timing parameters further preclude drop-in replacement without layout and firmware review.