Texas Instruments SN74ABT162827ADL

Overview

SN74ABT162827ADL 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 capability, and operation across −40°C to 85°C. It enables high-speed bus interfacing in backplane and motherboard applications where hot insertion and noise suppression are critical.

For engineers reviewing the SN74ABT162827ADL datasheet, SN74ABT162827ADL pinout, SN74ABT162827ADL application, or SN74ABT162827ADL equivalent, key selection criteria include its flow-through SSOP-56 layout, Ioff-enabled hot-insertion support, power-up 3-state behavior, distributed VCC/GND pinning for EMI reduction, and guaranteed 5-V TTL-compatible switching performance up to 4.7 ns propagation delay.

Technical Context

This device implements two independent 10-bit noninverting buffers, each requiring both OE inputs low to activate outputs; either OE high forces that section into high-impedance. Its architecture includes on-die 25-Ω series resistors per output to suppress overshoot/undershoot without external components.

It supports hot insertion via Ioff circuitry (≤±100 µA off-state current at VCC = 0) and power-up 3-state logic, ensuring outputs remain high-Z during supply ramping. Distributed VCC and GND pins across the 56-pin SSOP package minimize simultaneous switching noise, while latch-up immunity exceeds 500 mA per JESD-17.

Key Specifications

Pinout & Package

SN74ABT162827ADL uses a 56-pin Shrink Small Outline Package (SSOP-DL) with 0.5-mm pitch, 13.9 mm × 7.9 mm body size, and 1.2-mm max height. Pin 1 identifier is marked in top-left corner; package conforms to JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ABT162827ADL, the SN74ABT162827ADGGR offers identical functionality in a smaller TSSOP package ideal for high-density boards, while the SN74LVC16244ADGGR serves 3.3-V applications but sacrifices 5-V interoperability, integrated termination, and hot-swap capability - making SN74ABT162827ADL the sole choice for robust 5-V industrial backplane designs.

Availability

SN74ABT162827ADL is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive diagnostic tools, high-speed test equipment, and telecom backplane interfaces requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74ABT162827ADL 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 90 years of innovation in industrial, automotive, and communications markets.

SN74ABT162827ADL belongs to TI's Widebus™ family of high-speed TTL-compatible logic devices, engineered specifically for noise-sensitive, high-density parallel bus applications demanding hot insertion, signal integrity, and long-term reliability.

FAQ

What is the recommended power-up sequence for SN74ABT162827ADL to ensure safe operation?

SN74ABT162827ADL incorporates power-up 3-state logic that automatically places all outputs in high-impedance during VCC ramp-up. No specific power sequencing is required between VCC and OE inputs. However, TI recommends tying OE pins to VCC via a pullup resistor (minimum value determined by driver sink capability) to guarantee high-Z state if OE floats during startup - this prevents bus contention in uncontrolled power environments.

Does SN74ABT162827ADL support hot insertion, and what design features enable it?

Yes, SN74ABT162827ADL supports hot insertion via two integrated features: Ioff circuitry limits off-state current to ≤±100 µA when VCC = 0, preventing reverse current flow into powered circuitry; and power-up 3-state ensures outputs remain high-Z until VCC reaches valid operating range. These features eliminate need for external isolation FETs or complex sequencing controllers in live-swap systems like modular PLCs or telecom line cards.

Can SN74ABT162827ADL drive 50-Ω transmission lines directly without external termination resistors?

Yes, SN74ABT162827ADL integrates 25-Ω series resistors on all 20 outputs - matching half the characteristic impedance of standard 50-Ω PCB traces. When driving such lines, the combination of internal 25-Ω + external 50-Ω load forms a properly terminated source-series configuration, eliminating overshoot/undershoot and reducing layout complexity. This is confirmed in the datasheet's "Output Ports Have Equivalent 25-Ω Series Resistors" feature statement.

What is the maximum clock/data toggle rate supported by SN74ABT162827ADL in a real-world application?

While SN74ABT162827ADL has no explicit clock input, its propagation delay (tPLH/tPHL ≤ 4.1 ns at VCC = 5 V) and transition rate specification (∆t/∆V ≤ 10 ns/V) support reliable operation with data edges toggling up to ~200 MHz in well-designed 50-Ω-terminated systems. Real-world maximum rate depends on trace length, load capacitance, and noise margin - TI's application note SCBA004 confirms stable operation at 100+ MHz with proper layout and decoupling.

How does the flow-through architecture of SN74ABT162827ADL improve PCB layout efficiency?

The flow-through pin arrangement (e.g., 1A1 → 1Y1 → 1A2 → 1Y2…) allows bidirectional signal routing in straight lines across the package, minimizing vias, layer changes, and trace stubs. This reduces differential skew between parallel bus lines, simplifies length matching, and cuts routing time by up to 30% compared to traditional input-on-one-side/output-on-the-other layouts - a key advantage in high-speed backplane and test equipment designs.