Texas Instruments SN74LVT16952DL

Overview

SN74LVT16952DL from Texas Instruments is a 3.3-V ABT 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between 3.3-V logic and 5-V systems. It supports two independent 8-bit or one unified 16-bit register-controlled bus interface, operates from 2.7 V to 3.6 V, features bus-hold inputs, and delivers 150-MHz clock frequency capability in DL-package SSOP-56.

For engineers reviewing the SN74LVT16952DL datasheet, SN74LVT16952DL pinout, SN74LVT16952DL application, or SN74LVT16952DL equivalent, key selection criteria include mixed-mode voltage tolerance (5-V input compatibility with 3.3-V VCC), registered timing control (CLKAB/CLKBA edge-triggered latching), 3-state output enable sequencing, and DL-package thermal performance (1.4 W max at TA = 55°C).

Technical Context

The SN74LVT16952DL implements dual 8-bit registered transceiver channels using Advanced BiCMOS Technology (ABT), enabling synchronous data capture on rising clock edges when corresponding clock-enable inputs are low. Each channel includes independent OEAB/OEBA, CLKAB/CLKBA, and CLKENAB/CLKENBA controls for precise direction and timing management.

Its bus-hold circuitry actively maintains floating A/B port inputs at valid logic levels without external pullups, while distributed VCC/GND pinning and flow-through architecture reduce switching noise and optimize PCB layout. The device supports live insertion and unregulated battery operation down to 2.7 V.

Key Specifications

Pinout & Package

SN74LVT16952DL uses a 56-pin Shrink Small-Outline Package (SSOP-DL) with 0.5-mm pitch, 13.9 mm × 7.9 mm body, and 1.2-mm max height. Pin 1 is marked in top-left corner; package conforms to JEDEC MO-153.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16952DGGR and SN74ALVCH16952GR, the SN74LVT16952DL uniquely combines 5-V input tolerance, bus-hold, 64-mA drive, and 150-MHz operation in a thermally robust DL package-making it the sole option for industrial mixed-voltage registered bus bridging where reliability and legacy compatibility are mandatory.

Availability

SN74LVT16952DL is available at Aetrix Electronics and suitable for memory interface bridges, FPGA-to-ASIC data links, industrial backplane interfaces, and embedded controller expansion buses requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVT16952DL 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 50 years of innovation in high-reliability interface and signal-path components.

The SN74LVT16952DL belongs to TI's Widebus™ family of registered transceivers, engineered specifically for voltage-level bridging, noise-immune bus interfacing, and high-speed synchronous data transfer in mixed-voltage industrial and communications systems.

FAQ

What is the maximum clock frequency supported by the SN74LVT16952DL?

The SN74LVT16952DL supports a maximum clock frequency of 150 MHz under recommended operating conditions (VCC = 3.3 V ± 0.3 V). This value is verified across the full industrial temperature range (–40°C to +85°C) and applies to both A-to-B and B-to-A data paths. Timing parameters such as t_su, t_h, and propagation delay remain within specification up to this frequency, enabling use in high-bandwidth memory and interconnect applications. The SN74LVT16952DL achieves this performance using Texas Instruments' Advanced BiCMOS Technology (ABT), which balances speed and power efficiency.

Does the SN74LVT16952DL support 5-V input signals while operating at 3.3-V VCC?

Yes, the SN74LVT16952DL fully supports 5-V TTL input signals while powered from a 3.3-V supply. Its input voltage range extends to 5.5 V, and it guarantees VIH ≥ 2.0 V and VIL ≤ 0.8 V under all operating conditions. This mixed-mode capability is inherent to the ABT process and eliminates the need for external level translators when interfacing with legacy 5-V logic. The SN74LVT16952DL maintains this compatibility without degrading timing or drive strength, making it ideal for upgrading 5-V systems to 3.3-V core logic.

How does the bus-hold feature work on the SN74LVT16952DL, and what design benefit does it provide?

The SN74LVT16952DL integrates active bus-hold circuitry on all A and B port inputs, which detects floating states and reinforces the last-valid logic level with ~75 µA hold current. This eliminates the need for external pullup or pulldown resistors on unused or unterminated data lines. In practice, this reduces BOM cost, saves PCB area, improves signal integrity by avoiding resistor-induced RC delays, and enhances system robustness against noise-induced glitches. The bus-hold function remains active across the full –40°C to +85°C temperature range and requires no configuration - it is always enabled on the SN74LVT16952DL.

What is the thermal performance of the SN74LVT16952DL in its DL package?

The SN74LVT16952DL in the DL (Shrink Small-Outline) package has a maximum power dissipation of 1.4 W at TA = 55°C in still air, as specified in the absolute maximum ratings table. Its thermal resistance (θ_JA) is not explicitly published, but the DL package's 13.9 mm × 7.9 mm body and distributed VCC/GND pins significantly reduce junction-to-ambient thermal impedance compared to standard SOIC. For continuous operation at full drive (64 mA per output), board-level thermal design should include at least two internal ground/power planes and localized copper pours under the package. The SN74LVT16952DL's ABT process also contributes to low-static power dissipation, keeping ICC below 5 mA during active operation.

Can the SN74LVT16952DL be used for live insertion in backplane applications?

Yes, the SN74LVT16952DL is explicitly designed for live insertion, as confirmed by its support for controlled output-enable sequencing, robust ESD protection (>2000 V per MIL-STD-883 Method 3015), and latch-up immunity exceeding 500 mA per JEDEC JESD-17. Its 3-state outputs can be safely enabled/disabled during hot-swap events without disrupting adjacent slots, and the bus-hold feature prevents floating inputs during partial connection. To implement live insertion, OE pins must be driven by a sequenced control signal (e.g., from a CPLD), and the SN74LVT16952DL's DL package mechanical stability ensures reliable contact engagement. This makes the SN74LVT16952DL suitable for modular telecom and industrial chassis designs.