Texas Instruments SN74ABT5402ADWR

Overview

SN74ABT5402ADWR from Texas Instruments is a 12-bit noninverting 3-state line/memory driver with dual active-low output-enable inputs (OE1, OE2), designed for high-density memory address and bus-oriented applications. It operates at 4.5–5.5 V, supports ±12 mA output drive, integrates 25-Ω series output resistors to suppress overshoot/undershoot, and is rated for –40°C to 85°C industrial temperature range.

For engineers reviewing the SN74ABT5402ADWR datasheet, SN74ABT5402ADWR pinout, SN74ABT5402ADWR application, or SN74ABT5402ADWR equivalent, key selection criteria include 3-state bus isolation timing (tPZH max 8.7 ns), low ground bounce (VOLP < 1 V), latch-up immunity (>500 mA), and SOIC-28 package compatibility with standard PCB footprints.

Technical Context

This BiCMOS device implements a dual-gated 3-state control architecture: both OE1 and OE2 must be low to enable outputs; either high forces all 12 Y outputs into high-impedance state. Its EPIC-II^B process delivers reduced power dissipation versus legacy TTL while maintaining compatible logic thresholds (VIH = 2 V, VIL = 0.8 V).

The integrated 25-Ω series termination eliminates external resistors for controlled-impedance trace interfaces. Output voltage specs are VOH ≥ 3.35 V (IOH = –12 mA) and VOL ≤ 0.8 V (IOL = 12 mA) at VCC = 4.5 V, ensuring robust noise margins in noisy bus environments.

Key Specifications

Pinout & Package

SN74ABT5402ADWR is housed in a 28-pin plastic small-outline integrated circuit (SOIC-DW) package, 17.9 mm × 7.5 mm body size, 2.65 mm height, with gull-wing leads and RoHS-compliant NiPdAu finish. Moisture sensitivity level is MSL-1 (unlimited floor life at ≤30°C/60% RH).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 12-bit 3-state buffer applications.

Compared with SN74ABT244N and SN74LVC125APW, SN74ABT5402ADWR uniquely delivers 12-bit channel count in a single SOIC-28 package with factory-integrated 25-Ω termination-reducing layout complexity and improving signal integrity in legacy 5-V memory and bus systems without redesign.

Availability

SN74ABT5402ADWR is available at Aetrix Electronics and suitable for industrial control systems, test instrumentation, and legacy 5-V embedded computing platforms requiring stable component supply and long-term manufacturing continuity.

Supply support for SN74ABT5402ADWR 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 heritage in industrial-grade logic families.

The ABT logic family-including SN74ABT5402ADWR-is engineered for high-speed, low-noise 5-V bus interfacing in mission-critical industrial and communications infrastructure, emphasizing robustness, timing precision, and system-level EMI control.

FAQ

What is the recommended power-up sequence for SN74ABT5402ADWR to ensure proper 3-state initialization?

To guarantee all outputs remain in high-impedance during power ramp-up, tie OE1 and OE2 to VCC via pullup resistors (minimum value determined by driver sink capability). This prevents floating enables that could cause bus contention. The SN74ABT5402ADWR datasheet specifies this practice to avoid unintended output assertion before system firmware configures control lines. No external reset circuit is required if OE pins are properly biased at power-on.

Does SN74ABT5402ADWR support hot-swap or live-insertion into a powered-backplane?

SN74ABT5402ADWR features Ioff protection (±100 µA at VCC = 0), allowing safe insertion into a live 5-V bus without damaging the device or disturbing other components. However, its JEDEC JESD-17 latch-up rating (>500 mA) applies only after full power-up; transient current limiting on the backplane is still recommended. The SN74ABT5402ADWR is not rated for true hot-swap controller functionality but tolerates brief pre-charge transients.

Can SN74ABT5402ADWR drive unterminated 50-Ω transmission lines directly?

No-SN74ABT5402ADWR's integrated 25-Ω series resistors are optimized for driving typical PCB traces (characteristic impedance ~60–70 Ω) into capacitive loads, not 50-Ω coaxial or controlled-impedance backplanes. For true 50-Ω matching, external series or parallel termination is required. The SN74ABT5402ADWR reduces but does not eliminate the need for careful trace design; its 25-Ω resistor targets overshoot suppression, not full impedance matching.

What is the maximum clock frequency supported when using SN74ABT5402ADWR as a data latch in a synchronous bus?

Based on worst-case propagation delay (tPLH/tPHL ≤ 6.3 ns) and 3-state disable time (tPZH ≤ 8.7 ns), SN74ABT5402ADWR supports reliable operation in synchronous buses up to approximately 80 MHz under load (CL = 50 pF). Real-world maximum frequency depends on trace length, fanout, and timing margin requirements; for 100-MHz designs, derating or simulation is advised. The SN74ABT5402ADWR is not specified for >100-MHz operation in the official datasheet.

Is SN74ABT5402ADWR pin-compatible with earlier 74-series logic like SN74LS540?

No-SN74ABT5402ADWR uses a 28-pin SOIC (DW) package with dual OE inputs and 12 independent I/O pairs, whereas SN74LS540 is an octal inverting buffer in a 20-pin package with single OE. Pin count, pinout, logic polarity, and electrical characteristics differ fundamentally. Direct replacement would require PCB redesign. The SN74ABT5402ADWR is functionally distinct and not a drop-in upgrade for LS-family parts.