Texas Instruments SN74LVTH2952DWR

Overview

SN74LVTH2952DWR from Texas Instruments is an octal bus transceiver and register IC designed for bidirectional 3.3-V V_CC operation with 5-V tolerant inputs/outputs, supporting mixed-mode signal interfacing between 3.3-V logic and legacy 5-V systems. It features dual 8-bit back-to-back registers, bus-hold on all data inputs, I_off and power-up 3-state for hot insertion, and operates down to 2.7 V supply voltage. Used in system-level bus bridging applications requiring level translation and data latching.

For engineers reviewing the SN74LVTH2952DWR datasheet, SN74LVTH2952DWR pinout, SN74LVTH2952DWR application, or SN74LVTH2952DWR equivalent, key selection considerations include its dual-clock-controlled bidirectional register architecture, 2.7–3.6 V supply range, 5-V input tolerance, bus-hold functionality eliminating external resistors, and SOIC-24 package compatibility with industrial temperature range (−40°C to 85°C).

Technical Context

The SN74LVTH2952DWR implements two independent 8-bit register paths (A↔B) with separate clock (CLKAB/CLKBA), clock-enable (CLKENAB/CLKENBA), and output-enable (OEAB/OEBA) controls. Data is latched on the low-to-high transition of CLKAB or CLKBA when the corresponding CLKEN is low, enabling synchronous bidirectional flow control.

It integrates active bus-hold circuitry on all A- and B-port data inputs (A1–A8, B1–B8), maintaining valid logic levels without external pullup/pulldown resistors. I_off protection disables outputs during power-down to prevent backflow current, while power-up 3-state ensures high-impedance outputs during V_CC ramp-up from 0 to 1.5 V.

Key Specifications

Pinout & Package

SN74LVTH2952DWR is packaged in a 24-pin SOIC (DW) body measuring 7.5 mm × 15.4 mm with 1.27 mm pitch, RoHS-compliant, NIPDAU lead finish, and MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar octal bidirectional bus transceiver applications.

Compared with SN74LVTH2952DWR, SN74LVC245APWR offers lower propagation delay but no clocked register function, making it unsuitable for synchronous data capture; SN74LVTH16245ADGGR provides doubled throughput but demands layout revision and does not preserve the dual-clock directional control architecture.

Availability

SN74LVTH2952DWR is available at Aetrix Electronics and suitable for industrial automation interfaces, embedded computing bridges, and automotive body electronics requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74LVTH2952DWR 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 expertise in high-reliability interface ICs for industrial and automotive markets.

The SN74LVTH2952DWR belongs to TI's LVTH logic family, engineered specifically for mixed-voltage system interconnection - delivering robust 5-V/3.3-V interoperability, hot-swap resilience, and register-based data synchronization in space-constrained designs.

FAQ

What is the maximum operating frequency of the SN74LVTH2952DWR?

The SN74LVTH2952DWR supports a maximum clock frequency of 150 MHz across its recommended operating range (V_CC = 2.7 V to 3.6 V). This specification applies to both CLKAB and CLKBA inputs and is validated with CL = 50 pF load. At V_CC = 3.3 V ± 0.3 V, timing parameters including t_su, t_h, and propagation delays remain within guaranteed limits up to this rate, enabling use in high-speed synchronous bus applications.

Does the SN74LVTH2952DWR require external pullup resistors on its data lines?

No, the SN74LVTH2952DWR does not require external pullup or pulldown resistors on its A1–A8 or B1–B8 data inputs because it integrates active bus-hold circuitry. This feature maintains unused or floating inputs at valid logic levels using ±500 µA dynamic hold current. TI explicitly advises against combining external resistors with bus-hold, as they may interfere with proper input state retention and increase power consumption.

Can the SN74LVTH2952DWR be used in hot-swap applications?

Yes, the SN74LVTH2952DWR is explicitly designed for hot-insertion applications. Its I_off circuitry disables outputs when V_CC = 0 V, preventing damaging current backflow through powered-down devices. Additionally, power-up 3-state ensures outputs remain in high-impedance mode during V_CC ramp-up from 0 to 1.5 V, eliminating bus contention during live insertion. These features meet JEDEC JESD78 latch-up and JESD22 ESD requirements.

What is the supply voltage range for reliable operation of the SN74LVTH2952DWR?

The SN74LVTH2952DWR operates reliably over a V_CC range of 2.7 V to 3.6 V, with full functionality specified across this window. It supports unregulated battery operation down to 2.7 V and maintains 5-V input tolerance across the entire range. Operation below 2.7 V is not guaranteed - while the device enters high-impedance state below 1.5 V, logic performance degrades outside the recommended conditions, and timing parameters are not characterized.

How does the SN74LVTH2952DWR handle bidirectional data flow control?

The SN74LVTH2952DWR uses independent control signals for each direction: OEAB and CLKENAB govern A→B flow, while OEBA and CLKENBA control B→A flow. Data is latched on the rising edge of CLKAB or CLKBA only when the corresponding CLKEN is low; OEAB/OEBA then enable the registered data onto the opposite bus. This architecture allows asynchronous, non-blocking bidirectional transfers - for example, A→B data can be captured while B→A data remains held or updated independently.