Texas Instruments SN74ABT2244PWLE

Overview

SN74ABT2244PWLE 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 PCBs where signal integrity and board space are critical.

For engineers reviewing the SN74ABT2244PWLE datasheet, SN74ABT2244PWLE pinout, SN74ABT2244PWLE application, or SN74ABT2244PWLE equivalent, key selection factors include its TSSOP-20 package footprint, 3-state control timing (tPZL ≤ 8.3 ns), output ground bounce <1 V, and compatibility with 5-V TTL/CMOS buses in industrial control and data acquisition systems.

Technical Context

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

It uses Texas Instruments' EPIC-II^B BiCMOS process for low power dissipation and high-speed switching: tPLH/tPHL ≤ 4.7 ns, tPZL/tPHZ ≤ 8.3 ns at 5 V and CL = 50 pF, with guaranteed 12 mA sink current per output and high-impedance state robustness during power sequencing.

Key Specifications

Pinout & Package

TSSOP-20 (PW) package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm max height, JEDEC MO-153 compliant. Surface-mount, lead-free (RoHS), moisture sensitivity level not specified in available documentation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT2244PWLE, SN74LVC244APWR offers lower voltage operation but lacks integrated termination and 5-V tolerance, while SN74ABT244N provides identical electrical performance in a through-hole package-making the PWLE variant optimal for high-density, surface-mount industrial PCBs requiring 5-V bus integrity.

Availability

SN74ABT2244PWLE is available at Aetrix Electronics and suitable for industrial control, data acquisition, and legacy system interface applications requiring stable component supply and long-term obsolescence management.

Supply support for SN74ABT2244PWLE 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 U.S.-based semiconductor company founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.

The SN74ABT2244 belongs to TI's ABT advanced BiCMOS logic family, engineered for high-speed, low-noise 5-V bus interfacing in space- and power-constrained industrial systems.

FAQ

What is the recommended power-up sequence for SN74ABT2244PWLE to avoid bus contention?

TI specifies that OE inputs must be held high (via pullup resistor to VCC) during power-up to guarantee outputs remain in high-impedance state. For SN74ABT2244PWLE, use a resistor ≤10 kΩ to ensure sufficient current sinking capability while minimizing quiescent current. This prevents undefined output states before system initialization completes.

Does SN74ABT2244PWLE support mixed-voltage operation, such as interfacing 3.3-V microcontrollers with 5-V peripherals?

No. SN74ABT2244PWLE is strictly a 5-V device with VIH = 2 V min and VIL = 0.8 V max - it accepts 3.3-V logic-high inputs reliably, but its outputs swing rail-to-rail at 5 V and are not 3.3-V tolerant. Direct connection to 3.3-V receivers requires level-shifting or clamping networks to prevent damage.

Can SN74ABT2244PWLE drive unterminated 50-Ω transmission lines directly?

Yes - each output integrates a 25-Ω series resistor optimized for driving standard 50-Ω PCB traces in source-series termination configuration. When placed near the driver, this achieves near-perfect impedance matching for point-to-point connections up to ~10 cm at 100 MHz, eliminating ringing and reducing EMI.

What is the maximum capacitive load SN74ABT2244PWLE can drive while maintaining specified timing?

TI characterizes switching parameters at CL = 50 pF. While SN74ABT2244PWLE can drive higher loads (e.g., 100 pF), propagation and enable/disable delays increase linearly - tPLH rises ~1.2 ns per 10 pF beyond 50 pF. For timing-critical applications, keep total load ≤50 pF or recalculate timing margins using the device's output impedance and trace characteristics.

Is SN74ABT2244PWLE RoHS-compliant and lead-free?

Yes. Per TI's packaging documentation, SN74ABT2244PWLE uses a Pb-Free (RoHS) finish and complies with EU Directive 2011/65/EU. The PW package is marked with TI's standard RoHS logo and has undergone full qualification per J-STD-020 moisture sensitivity testing (MSL level not published, but consistent with standard TSSOP handling).