Texas Instruments SN74LVT2952DW

Overview

SN74LVT2952DW from Texas Instruments is an octal 3.3-V bus transceiver and register with dual-directional data flow, 150-MHz clock frequency support, ±64-mA output drive, bus-hold inputs, and mixed-mode 5-V/3.3-V I/O compatibility. It enables bidirectional data transfer between two 8-bit buses in high-speed digital systems such as backplane interfaces and FPGA-to-ASIC interconnects.

For engineers reviewing the SN74LVT2952DW datasheet, SN74LVT2952DW pinout, SN74LVT2952DW application, or SN74LVT2952DW equivalent, key selection considerations include its dual-clock-enable control (CLKENAB/CLKENBA), OE-driven high-impedance state, 2.7–3.6-V VCC operation, and DW package thermal performance (1.7 W at 55°C).

Technical Context

The SN74LVT2952DW implements two independent 8-bit back-to-back registers synchronized to separate clocks (CLKAB/CLKBA) and clock enables (CLKENAB/CLKENBA), allowing asynchronous A↔B data latching. Each direction supports TTL-level input thresholds (VIL = 0.8 V, VIH = 2.0 V) while operating from a 3.3-V supply.

Its Advanced BiCMOS Technology (ABT) delivers low static current (0.13–0.19 mA in disabled state), controlled output switching (tPLH/tPHL ≤ 6.4 ns), and robust ESD protection (>2000 V HBM). Bus-hold circuitry eliminates external pullups on floating A/B port inputs, and live insertion support enables hot-swap capability.

Key Specifications

Pinout & Package

SN74LVT2952DW uses a 28-pin SOIC (DW) package with 300-mil body width, gull-wing leads, and JEDEC MO-150 compliance. Pin pitch is 0.050 inch (1.27 mm); package dimensions are 17.9 × 7.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVT2952DW, SN74LVTH245ADW offers lower complexity but no register synchronization, while SN74ALVC16245DGGR provides double-width data paths at the cost of losing 5-V compatibility and bus-hold-making SN74LVT2952DW uniquely suited for registered, mixed-voltage, space-constrained designs.

Availability

SN74LVT2952DW is available at Aetrix Electronics and suitable for backplane interconnect, FPGA-to-ASIC bridging, and industrial PLC backplane applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for SN74LVT2952DW 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.

The SN74LVT2952DW belongs to TI's ABT (Advanced BiCMOS Technology) logic family, engineered for high-speed, low-power 3.3-V operation in mixed-voltage digital systems requiring robust noise immunity and hot-swap capability.

FAQ

What is the maximum clock frequency supported by the SN74LVT2952DW?

The SN74LVT2952DW supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.3 V ± 0.3 V, TA = 25°C). This rating applies to both CLKAB and CLKBA inputs and is validated with CL = 50 pF load. At VCC = 2.7 V, the device maintains full functionality but may require timing margin verification in high-speed layouts.

Does the SN74LVT2952DW support 5-V input signals while operating at 3.3-V VCC?

Yes, the SN74LVT2952DW supports 5-V-tolerant inputs and outputs with a 3.3-V VCC supply. Its mixed-mode design allows direct connection to 5-V TTL logic without external level shifters, verified across VI = 0 to 5.5 V and VO = 0 to 5.5 V ranges per absolute maximum ratings.

How does the bus-hold feature work on the SN74LVT2952DW, and what is its design impact?

The SN74LVT2952DW integrates active bus-hold circuitry on all A and B port inputs, providing ±75 µA holding current to maintain valid logic states on floating lines. This eliminates the need for external 10-kΩ pullup/pulldown resistors, reducing BOM cost, PCB area, and potential signal integrity issues caused by resistor parasitics.

What is the thermal performance limit of the SN74LVT2952DW in the DW package?

The SN74LVT2952DW in the DW (SOIC) package has a maximum power dissipation of 1.7 W at TA = 55°C in still air, based on a junction temperature limit of 150°C. Designers must ensure adequate copper pour and airflow if ambient temperatures approach 85°C, as derating curves apply beyond 55°C.

Can the SN74LVT2952DW be used in hot-swap or live-insertion systems?

Yes, the SN74LVT2952DW supports live insertion per its ABT process design. Its controlled power-up sequence, high-impedance default state when OE is high, and robust ESD protection (>2000 V HBM) prevent bus contention and damage during hot-plug events in modular backplane systems.