Texas Instruments SN74LVC2952APWR

Overview

SN74LVC2952APWR from Texas Instruments is an octal bus transceiver and register with 3-state outputs, designed for bidirectional data flow between two 8-bit buses in mixed-voltage systems. It operates from 1.65 V to 3.6 V, supports 5.5-V-tolerant inputs, delivers 8.2 ns max propagation delay at 3.3 V, and features Ioff partial-power-down protection. It is used in level-shifting interfaces between 3.3-V and 5-V logic domains in industrial control backplanes and FPGA I/O expansion.

For engineers reviewing the SN74LVC2952APWR datasheet, SN74LVC2952APWR pinout, SN74LVC2952APWR application, or SN74LVC2952APWR equivalent, key selection criteria include its dual-clock-register architecture, 24-pin TSSOP package, 3.6-V absolute maximum input voltage rating, and guaranteed 150-MHz clock frequency support under recommended conditions.

Technical Context

The SN74LVC2952APWR implements two independent 8-bit back-to-back registers: one for A→B data flow (controlled by CLKAB/CLKENAB/OEAB) and another for B→A flow (CLKBA/CLKENBA/OEBA). Each register captures data on the low-to-high clock transition when its respective clock-enable is low, and outputs are placed in high-impedance state when OE is high.

Its Ioff circuitry actively disables outputs during power-down to prevent current backflow, and its 5.5-V-tolerant inputs enable direct interfacing with legacy 5-V TTL outputs while powered from a 3.3-V supply - a critical capability for voltage translation without external biasing.

Key Specifications

Pinout & Package

TSSOP-24 (PW) package, 7.9 mm × 4.5 mm body, 0.65 mm pitch, 1.2 mm max height, RoHS-compliant NIPDAU lead finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2952APWR, SN74LVC245APWR offers faster raw throughput but lacks synchronous registration, while SN74ALVC162952GR scales bus width and drive capability at the cost of pin count and footprint - making SN74LVC2952APWR optimal for compact, clock-synchronized 8-bit bridging where timing determinism and voltage translation are jointly required.

Availability

SN74LVC2952APWR is available at Aetrix Electronics and suitable for industrial backplane interfaces, FPGA I/O expansion, and automotive diagnostic hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC2952APWR 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 connectivity technologies, with decades of expertise in logic interface solutions and industrial-grade reliability.

The SN74LVC2952APWR belongs to TI's LVC logic family, engineered for low-voltage, high-speed, mixed-signal interfacing in space-constrained industrial and automotive systems where voltage translation and timing control are critical.

FAQ

What is the primary function of the SN74LVC2952APWR?

The SN74LVC2952APWR is an octal bus transceiver and register with 3-state outputs that enables bidirectional, clock-synchronized data transfer between two 8-bit buses. It features separate A→B and B→A register paths, each with dedicated clock, clock-enable, and output-enable controls - allowing independent, deterministic data latching and output gating in mixed-voltage systems.

Does the SN74LVC2952APWR support 5-V inputs while powered from a 3.3-V supply?

Yes, the SN74LVC2952APWR supports inputs up to 5.5 V regardless of VCC, which can be as low as 1.65 V. This allows direct connection of 5-V TTL or CMOS outputs to either A or B ports while the device operates from a 3.3-V supply - a core feature enabling seamless level translation without external components.

What is the significance of Ioff in the SN74LVC2952APWR?

Ioff in the SN74LVC2952APWR refers to its powered-off output disable circuitry, which limits leakage current to ±10 µA when VCC = 0 V and I/O pins are driven. This prevents damaging reverse current flow during power sequencing, hot-swap events, or partial power-down - a requirement for robust operation in modular industrial and automotive electronics.

Can the SN74LVC2952APWR be used without external pull-up resistors on OE pins?

No - to ensure high-impedance outputs during power-up or power-down, OEAB and OEBA should be tied to VCC through pull-up resistors. TI specifies minimum resistor values based on driver sink capability; omitting them risks undefined output states and potential bus contention during supply ramp-up.

Is the SN74LVC2952APWR pin-compatible with other TSSOP-24 transceivers like the SN74LVC245APWR?

No, the SN74LVC2952APWR is not pin-compatible with SN74LVC245APWR. While both use TSSOP-24 packages, their pinouts differ significantly: SN74LVC2952APWR has dual clock, dual clock-enable, and dual OE signals for registered bidirectional operation, whereas SN74LVC245APWR uses a single OE and direction control (DIR) - requiring PCB redesign for substitution.