Texas Instruments SN74LVTH652IPWREP

Overview

SN74LVTH652IPWREP from Texas Instruments is a radiation-hardened, enhanced-product bus transceiver and register IC with dual 8-bit bidirectional data paths, D-type flip-flop storage, and mixed-mode 5-V/3.3-V interface capability. It operates from 2.7 V to 3.6 V VCC, supports hot insertion via Ioff and power-up 3-state, and features bus-hold on all A/B data inputs to eliminate external pull resistors. It is used in high-reliability industrial backplane and modular control systems requiring real-time or registered data transfer between 5-V and 3.3-V domains.

For engineers reviewing the SN74LVTH652IPWREP datasheet, SN74LVTH652IPWREP pinout, SN74LVTH652IPWREP application, or SN74LVTH652IPWREP equivalent, key selection criteria include its dual-clock (CLKAB/CLKBA) synchronous storage capability, real-time vs. stored data selection via SAB/SBA, OEAB/OEBA-controlled directionality, and guaranteed operation across −40°C to 85°C with enhanced DMS support.

Technical Context

This device integrates two independent 8-bit transceiver channels with edge-triggered D-type flip-flops per channel, enabling simultaneous or staggered storage of A- or B-bus data on low-to-high clock transitions. Its select-control logic eliminates multiplexer glitches during real-time ↔ stored mode transitions, with SAB/SBA determining source path without requiring external decoding.

The SN74LVTH652IPWREP implements true hot-insertion support via Ioff (±100 µA at VCC = 0) and power-up 3-state, ensuring outputs remain high-impedance during power ramping (200 µs/V). Bus-hold circuitry maintains valid logic levels on floating A/B inputs (±500 µA hold current at VCC = 3.6 V), eliminating need for external biasing while preventing undefined states.

Key Specifications

Pinout & Package

TSSOP-24 (PW) package: 7.8 mm × 4.4 mm body, 0.65 mm pitch, thin-profile surface-mount design optimized for high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus transceiver and register applications.

Compared with SN74LVTH652IPWREP, the SN74LVT652PWRE omits enhanced product-change notification and JEDEC-qualified reliability testing, while the SN74LVTH16652DLRE doubles data width at the expense of pin compatibility and increases thermal resistance (θJA ≈ 105°C/W vs. 88°C/W), limiting use in thermally constrained modules.

Availability

SN74LVTH652IPWREP is available at Aetrix Electronics and suitable for industrial control backplanes, ruggedized data acquisition systems, and avionics subsystem interfaces requiring stable component supply across extended product lifecycles.

Supply support for SN74LVTH652IPWREP 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 industrial and aerospace components.

The SN74LVTH652IPWREP belongs to TI's Enhanced Product (EP) logic family, designed specifically for applications demanding controlled baseline manufacturing, extended temperature operation, and diminished manufacturing sources support in harsh environments.

FAQ

What is the primary function of the SN74LVTH652IPWREP in a system architecture?

The SN74LVTH652IPWREP serves as a dual-directional, registered bus transceiver that enables synchronized data exchange between 5-V and 3.3-V domains. It provides real-time or clocked storage of 8-bit data on either bus side using independent CLKAB and CLKBA inputs, making it ideal for backplane interfaces where deterministic timing and voltage translation are required without external level shifters or latches.

Does the SN74LVTH652IPWREP support hot insertion, and how is this implemented?

Yes, the SN74LVTH652IPWREP supports hot insertion through two integrated mechanisms: Ioff circuitry limits current backflow to ±100 µA when VCC = 0, and power-up 3-state ensures outputs remain high-impedance during power ramping (200 µs/V). These features prevent bus contention and damage when the device is inserted into a live 5-V or 3.3-V backplane - a critical capability confirmed in the SCBS776 datasheet's "hot-insertion applications" section.

How does the bus-hold feature on the SN74LVTH652IPWREP eliminate the need for external resistors?

The SN74LVTH652IPWREP integrates active bus-hold circuitry on all A1–A8 and B1–B8 inputs, providing ±500 µA dynamic hold current at VCC = 3.6 V to maintain the last-valid logic state on floating lines. This eliminates external pullup/pulldown resistors by actively reinforcing input voltage levels - a design benefit explicitly stated in the datasheet's "Bus Hold on Data Inputs" feature and verified in electrical characteristics tables (II(hold) parameter).

What are the timing implications of using real-time versus stored data modes on the SN74LVTH652IPWREP?

In real-time mode (SAB/SBA = L), data passes directly between A and B buses with typical propagation delays of 1.3–2.4 ns. In stored mode (SAB/SBA = H), data is latched on CLKAB↑ or CLKBA↑ edges and forwarded with added clock-to-output delay (tPLH/tPHL ≤ 4.7 ns at VCC = 3.3 V). The datasheet confirms glitch-free mode transitions and specifies setup/hold times (tsu = 1.2–2.2 ns, th = 0.8 ns) to ensure reliable capture of data before clock edges.

Is the SN74LVTH652IPWREP compatible with standard TSSOP-24 footprints, and what are its thermal characteristics?

Yes, the SN74LVTH652IPWREP uses the industry-standard PW (TSSOP-24) package with 0.65 mm pitch and 7.8 mm × 4.4 mm body dimensions, matching JEDEC MO-153 specifications. Its thermal impedance is θJA = 88°C/W (measured per JESD 51-7), enabling reliable operation at full speed in ambient temperatures up to +85°C when mounted on 2-layer PCBs with standard copper pour - values confirmed in the "absolute maximum ratings" and "packaging information" sections of the SCBS776 datasheet.