Texas Instruments SN74ALVTH162827DL

Overview

SN74ALVTH162827DL from Texas Instruments is a 20-bit noninverting buffer/driver with 3-state outputs, designed for 2.5-V/3.3-V V_CC operation and TTL-level 5-V signal interfacing. It features bus-hold circuitry on all data inputs, integrated 30-Ω output series resistors, and auto 3-state functionality that disables outputs when Y exceeds V_CC + 0.5 V - enabling robust mixed-voltage backplane or memory interface buffering.

For engineers reviewing the SN74ALVTH162827DL datasheet, SN74ALVTH162827DL pinout, SN74ALVTH162827DL application, or SN74ALVTH162827DL equivalent, key selection criteria include its dual 10-bit section architecture with independent OE control, power-off high-impedance state, ground-bounce performance (<0.8 V at 3.3 V), and compatibility with live-insertion systems requiring bus stability during hot-swap events.

Technical Context

This device implements an Advanced BiCMOS Technology (ABT) Widebus™ architecture optimized for low static power dissipation and high-speed switching noise suppression via distributed V_CC/GND pin placement. Its flow-through pin layout minimizes trace crossovers on dense PCBs, while the dual 10-bit sections (each with two OE inputs) support independent enable/disable control per half-bus.

The SN74ALVTH162827DL supports mixed-mode signal operation: inputs tolerate 5-V logic levels across 2.3–3.6-V V_CC, and outputs drive 5-V TTL loads. Bus-hold circuitry eliminates external pullup/pulldown resistors, and the auto 3-state feature prevents bus contention when outputs float above V_CC + 0.5 V - critical in multi-drop or hot-pluggable configurations.

Key Specifications

Pinout & Package

SN74ALVTH162827DL uses a 56-pin Shrink Small-Outline Package (SSOP-DL), 11.4 mm × 7.9 mm body, 1.2 mm max height, with 0.5-mm lead pitch. Pin 1 index located at top-left corner; pins numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74ALVTH162827DL, SN74ALVCH162827GR sacrifices bus-hold and auto 3-state for lower quiescent current, while SN74LVC16244ADGGR trades channel count and voltage flexibility for higher drive strength - making SN74ALVTH162827DL uniquely suited for mixed-voltage, hot-swap, and floating-input scenarios.

Availability

SN74ALVTH162827DL is available at Aetrix Electronics and suitable for memory interface buffering, backplane data distribution, legacy system upgrades, and test equipment signal conditioning requiring stable component supply and long-term obsolescence management.

Supply support for SN74ALVTH162827DL 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 SN74ALVTH162827DL belongs to TI's Widebus™ ABT logic family, engineered for high-speed, low-noise, mixed-voltage interfacing in mission-critical infrastructure and upgradeable systems.

FAQ

What voltage levels can SN74ALVTH162827DL inputs safely accept?

SN74ALVTH162827DL inputs tolerate –0.5 V to 7 V, enabling direct connection to 5-V TTL buses while operating from 2.5-V or 3.3-V supplies. This eliminates external level-shifting components in mixed-voltage designs and ensures compatibility with legacy 5-V logic families without risk of damage or latch-up.

Does SN74ALVTH162827DL require external pullup or pulldown resistors on unused inputs?

No. SN74ALVTH162827DL integrates active bus-hold circuitry on all data inputs, which maintains valid logic states on floating or unterminated lines. This eliminates the need for external 10-kΩ pullup/pulldown resistors - reducing component count, board space, and potential signal integrity issues caused by parasitic capacitance.

How does SN74ALVTH162827DL behave during power-up and power-down sequences?

SN74ALVTH162827DL enters a guaranteed high-impedance state when V_CC ≤ 1.2 V, preventing output conflicts during power ramp-up or brownout. Above 1.2 V, OE inputs must be actively controlled (e.g., pulled to V_CC via resistor) to ensure defined output states - supporting safe live insertion in powered-backplane systems.

What is the purpose of the auto 3-state function in SN74ALVTH162827DL?

The auto 3-state function disables outputs when Y voltage exceeds V_CC + 0.5 V, preventing bus contention during overvoltage transients, hot-swap events, or unintended back-driving. This feature eliminates external protection circuitry and enhances system robustness in multi-drop or shared-bus architectures where output collisions could cause data corruption or hardware damage.

Can SN74ALVTH162827DL replace older 74-series buffers in existing designs?

Yes - SN74ALVTH162827DL provides pin-compatible replacement for legacy 20-bit buffers like SN74ABT162827 in DL-package designs, with enhanced features including bus-hold, auto 3-state, and improved ground-bounce performance (<0.8 V). However, verify OE logic polarity and timing margins, as propagation delays differ slightly due to ABT process optimization.