Texas Instruments SN74LVTH16652DGGR

Overview

SN74LVTH16652 from Texas Instruments is a 3.3-V ABT 16-bit bus transceiver and register with 3-state outputs, designed for mixed-mode signal operation between 3.3-V logic and 5-V systems. It supports real-time or stored data transfer across two 8-bit buses (A↔B), features dual clock inputs (CLKAB/CLKBA), dual select controls (SAB/SBA), and dual output enables (OEAB/OEBA). Used in high-speed backplane and motherboard bus management where hot insertion and bus hold are required.

For engineers reviewing the SN74LVTH16652 datasheet, SN74LVTH16652 pinout, SN74LVTH16652 application, or SN74LVTH16652 equivalent, key selection criteria include its 150-MHz clock frequency, 2.7–3.6-V VCC range, Ioff-enabled hot-insertion support, bus-hold on all data inputs, and TSSOP-56 (DGG) package compatibility with industrial temperature range (–40°C to 85°C).

Technical Context

The SN74LVTH16652 integrates two independent 8-bit transceiver/register channels, each with separate clock, select, and output-enable controls. Its ABT BiCMOS architecture delivers low static power at 3.3 V while tolerating 5-V inputs/outputs, enabling seamless interfacing between voltage domains.

It implements flow-through pin mapping to minimize PCB trace length and switching noise, with distributed VCC/GND pins and internal D-type flip-flops that store data on low-to-high clock transitions-regardless of OE or S input states. Bus-hold circuitry actively maintains valid logic levels on unused A/B port inputs without external resistors.

Key Specifications

Pinout & Package

TSSOP-56 (DGG) package: 13.9 mm × 6.1 mm × 1.2 mm body, 0.5-mm pitch, lead-free NiPdAu finish, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 16-bit bus transceiver applications.

Compared with SN74LVTH16652, SN74LVT16652 lacks bus-hold and Ioff-limiting use in floating-bus or hot-plug scenarios-while SN74ALVTH16652 offers higher performance headroom but identical footprint and thermal profile for drop-in evaluation.

Availability

SN74LVTH16652 is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, test equipment backplanes, and modular computing systems requiring stable component supply across extended product lifecycles.

Supply support for SN74LVTH16652 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 innovation in high-reliability interface ICs.

The LVTH16652 belongs to TI's Widebus™ family of advanced BiCMOS transceivers, engineered specifically for robust, low-noise, mixed-voltage bus management in industrial and communications infrastructure.

FAQ

What is the maximum operating frequency of the SN74LVTH16652?

The SN74LVTH16652 supports a maximum clock frequency of 150 MHz under recommended conditions (VCC = 3.3 V ± 0.3 V, TA = 25°C). This applies to both CLKAB and CLKBA inputs and is validated with CL = 50 pF load. At VCC = 2.7 V, the device maintains full 150-MHz capability, making it suitable for battery-powered or brownout-prone systems where voltage regulation is marginal.

Does the SN74LVTH16652 support hot insertion?

Yes, the SN74LVTH16652 supports hot insertion via two complementary features: Ioff circuitry disables outputs when VCC = 0 V to prevent damaging current backflow, and power-up 3-state holds outputs in high-impedance during power ramp (0–1.5 V). These functions are inherent to the ABT process and require no external configuration - confirmed in the datasheet's "Hot-Insertion Applications" section and absolute maximum ratings table.

Can the SN74LVTH16652 operate with a 5-V input while powered at 3.3 V?

Yes, the SN74LVTH16652 is explicitly rated for 5-V tolerant inputs and outputs while operating at VCC = 3.3 V. The datasheet specifies VI and VO limits up to 7 V (absolute max) and confirms mixed-mode operation in the feature list and recommended operating conditions (VI ≤ 5.5 V). This allows direct interfacing with legacy 5-V TTL logic without external level shifters.

What is the purpose of the SAB and SBA pins on the SN74LVTH16652?

The SAB and SBA pins are select-control inputs that determine whether the SN74LVTH16652 transfers real-time data (S = low) or stored data from internal registers (S = high). Each pair (SAB/SBA) operates independently per 8-bit channel, enabling flexible bus arbitration - e.g., one side passing live data while the other outputs latched values. The circuitry eliminates multiplexer glitches during mode transitions, as documented in the function table and description.

Is bus-hold functionality enabled by default on the SN74LVTH16652?

Yes, bus-hold is active by default on all A and B port inputs of the SN74LVTH16652 - no external components or configuration required. It provides ±75 µA holding current at VCC = 3 V to maintain valid logic states on floating or unterminated lines, eliminating the need for discrete pullup/pulldown resistors. This behavior is intrinsic to the ABT process and verified in the electrical characteristics table under II(hold).