Texas Instruments SN74ABT162827ADLR

Overview

SN74ABT162827ADLR from Texas Instruments is a noninverting 20-bit buffer IC with dual 10-bit sections, separate output-enable controls (1OE1/1OE2 and 2OE1/2OE2), 25-Ω integrated series output resistors, ±12 mA drive strength, and hot-insertion support via Ioff and power-up 3-state. It operates from 4.5 V to 5.5 V and targets high-speed bus interface applications in industrial backplanes and memory expansion modules.

For engineers reviewing the SN74ABT162827ADLR datasheet, SN74ABT162827ADLR pinout, SN74ABT162827ADLR application, or SN74ABT162827ADLR equivalent, key selection criteria include its 56-pin SSOP-DL package, guaranteed 3.9 ns max tPHL at 5 V, high-impedance state during power sequencing, distributed VCC/GND pin layout for noise suppression, and compatibility with 5-V TTL-level systems requiring latch-up immunity (>500 mA) and ESD protection (2000-V HBM).

Technical Context

This device implements a flow-through architecture with two independent 10-bit noninverting buffers, each requiring both OE inputs low to enable outputs-preventing partial activation. Its internal 25-Ω series termination eliminates external resistors while controlling overshoot/undershoot on fast-switching buses.

Designed for hot insertion, SN74ABT162827ADLR features Ioff circuitry that disables outputs when VCC = 0 V (±100 µA max reverse current), and power-up 3-state logic that holds outputs high-impedance until VCC stabilizes above 2.1 V-avoiding bus contention during power ramping.

Key Specifications

Pinout & Package

SN74ABT162827ADLR uses a 56-pin SSOP (Shrink Small Outline Package) with 0.5-mm pitch, 13.9 mm × 7.9 mm body, and 1.2 mm max height. The DL package variant has gull-wing leads optimized for automated SMT assembly and thermal dissipation (θJA = 56°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 20-bit noninverting buffer applications.

Compared with SN74ABT162827ADLR, SN74ABT162827ADGGR offers identical functionality in a thinner, wider TSSOP package ideal for height-sensitive layouts, while SN74LVC16244ADGGR provides higher drive at 3.3 V but sacrifices integrated termination, hot-swap support, and 5-V compatibility-making it unsuitable as a drop-in replacement.

Availability

SN74ABT162827ADLR is available at Aetrix Electronics and suitable for industrial backplane interface, memory expansion module, hot-swappable I/O card, and high-speed test equipment bus driver applications requiring stable component supply, long-term lifecycle assurance, and full traceability.

Supply support for SN74ABT162827ADLR 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 experience in high-reliability interface and bus technologies.

SN74ABT162827ADLR belongs to TI's Widebus™ family of advanced bus-interface logic devices, engineered specifically for high-speed, noise-immune parallel bus applications in industrial, telecom, and computing infrastructure.

FAQ

What is the recommended pull-up resistor value for OE pins on SN74ABT162827ADLR during power-up?

TI specifies that OE pins must be tied to VCC through a pullup resistor to ensure high-impedance state during power-up. The minimum resistor value depends on the current-sinking capability of the driving source; for standard 5-V TTL drivers sinking 0.4 mA, a 10-kΩ resistor is typical. SN74ABT162827ADLR itself draws negligible current in this configuration, and the resistor ensures OE remains high until firmware actively drives it low.

Does SN74ABT162827ADLR support mixed-voltage operation between input and output sides?

No, SN74ABT162827ADLR is a single-supply 5-V device with VCC = 4.5–5.5 V. All inputs and outputs operate referenced to this same VCC rail. It does not support level-shifting or mixed-voltage domains. Inputs tolerate up to 7 V (absolute max), but correct logic interpretation requires VIH ≥ 2.0 V and VIL ≤ 0.8 V relative to the 5-V VCC, making it incompatible with direct 3.3-V or 2.5-V logic interfacing without external translators.

Can SN74ABT162827ADLR be used in place of SN74ABT162827ADL?

Yes-SN74ABT162827ADLR and SN74ABT162827ADL share identical electrical specifications, pinout, and SSOP-DL package. The only difference is packaging format: ADLR is supplied in tape-and-reel (1000 units), while ADL is in tube (20 units). Both have identical top-side marking "ABT162827A" and identical thermal and reliability characteristics, making them functionally interchangeable in design and production.

What is the maximum capacitive load SN74ABT162827ADLR can drive while maintaining specified timing?

TI characterizes SN74ABT162827ADLR switching performance at CL = 50 pF, which represents the maximum load used in official timing parameter derivation (e.g., tPHL ≤ 4.1 ns). While the device can physically drive heavier loads, exceeding 50 pF increases propagation delay nonlinearly and may degrade edge fidelity. For reliable timing compliance, keep total node capacitance-including trace, stub, and receiver input-≤50 pF per output, or recalculate delays using the device's known output impedance and load.

How does the 25-Ω series resistor in SN74ABT162827ADLR affect signal integrity on a 50-Ω PCB trace?

The integrated 25-Ω resistor acts as a source-series terminator. When driven into a 50-Ω transmission line, it forms a voltage divider with the line impedance, resulting in ~50% amplitude reduction at the driver output-but full amplitude at the far-end receiver due to reflection cancellation. This configuration suppresses overshoot and undershoot without requiring external components, provided the trace is properly terminated at the receiver end (e.g., with 50-Ω to GND or VCC). SN74ABT162827ADLR's design assumes this standard source-series + end-termination topology.