Texas Instruments SN74LVCH16952ADGVR

Overview

SN74LVCH16952ADGVR from Texas Instruments is a 16-bit registered transceiver with 3-state outputs, designed for bidirectional data flow between A and B buses in 1.65–3.6 V systems. It features dual 8-bit register sets, bus-hold inputs, Ioff partial-power-down support, and mixed-mode 5-V-tolerant inputs with 3.3-V VCC - used in high-density memory interface and FPGA-to-ASIC bridging applications.

For engineers reviewing the SN74LVCH16952ADGVR datasheet, SN74LVCH16952ADGVR pinout, SN74LVCH16952ADGVR application, or SN74LVCH16952ADGVR equivalent, key selection criteria include tpd ≤6.6 ns at 3.3 V, 56-pin TVSOP (DGV) package compatibility, 3.3-V/5-V mixed-signal translation capability, and bus-hold circuitry eliminating external pull resistors.

Technical Context

The SN74LVCH16952ADGVR implements two independent 8-bit D-type flip-flop banks - one for A→B and one for B→A data paths - each controlled by dedicated clock (CLKAB/CLKBA), clock-enable (CEAB/CEBA), and output-enable (OEAB/OEBA) signals. Data latching occurs on the low-to-high clock transition when CE is low; OE controls 3-state output access.

Its Ioff circuitry disables outputs during power-down to prevent backflow current, while bus-hold inputs maintain valid logic levels on floating A/B port lines without external components. Input voltage tolerance up to 5.5 V enables interoperability between 3.3-V logic domains and legacy 5-V peripherals.

Key Specifications

Pinout & Package

SN74LVCH16952ADGVR is packaged in a 56-pin Thin Very Small Outline Package (TVSOP, DGV), 7.9 mm × 4.5 mm body size, 1.2 mm max height, JEDEC MO-194 compliant, with 0.4 mm lead pitch and Q1 pin-1 orientation in tape-and-reel delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVCH16952ADGVR, SN74LVC16952DGGR omits critical mixed-voltage and power-down features, while 74ALVCH16952MTD trades ESD robustness and bus-hold for slightly higher minimum VCC - making SN74LVCH16952ADGVR the sole option supporting 1.65-V operation, 5-V input tolerance, and safe partial-power-down in industrial and telecom applications.

Availability

SN74LVCH16952ADGVR is available at Aetrix Electronics and suitable for memory interface bridging, FPGA-to-ASIC data translation, and hot-swappable module backplane applications requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for SN74LVCH16952ADGVR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.

The SN74LVCH16952ADGVR belongs to TI's Widebus™ family of high-speed, low-voltage logic devices engineered specifically for noise-immune, timing-critical parallel bus interfaces in space-constrained, mixed-voltage systems.

FAQ

What is the maximum clock frequency supported by the SN74LVCH16952ADGVR?

The SN74LVCH16952ADGVR supports a maximum clock frequency of 150 MHz at VCC = 3.3 V, as specified in the timing requirements table. This value is validated across the full operating temperature range (–40°C to +85°C) and assumes proper load conditions (CL = 50 pF). At lower VCC (e.g., 1.8 V), fmax reduces to 130 MHz due to reduced drive strength and increased propagation delay.

Does the SN74LVCH16952ADGVR require external pullup resistors on its control inputs?

No - the SN74LVCH16952ADGVR does not require external pullup resistors on OE, CE, or CLK inputs because all control inputs have standard CMOS thresholds and are not bus-held. However, TI recommends tying OE to VCC via a pullup resistor during power-up to ensure outputs remain in high-impedance state until firmware initializes the device - this is a system-level reliability practice, not an IC requirement.

Can the SN74LVCH16952ADGVR be used in a purely 5-V system?

No - the SN74LVCH16952ADGVR is not rated for 5-V VCC operation. Its absolute maximum VCC is 6.5 V, but recommended operating VCC is strictly 1.65–3.6 V. While inputs tolerate up to 5.5 V, applying 5 V to VCC exceeds specification and risks parametric failure or accelerated wear-out. For 5-V systems, consider the 74ACT16952 or similar 5-V-family devices.

How does bus-hold functionality behave when OE is asserted low on the SN74LVCH16952ADGVR?

Bus-hold remains fully active on all A and B port inputs regardless of OE state - it is part of the input circuitry and is not disabled by output-enable control. When OE is low, outputs drive valid logic levels; when OE is high, outputs go high-impedance, but bus-hold continues holding floating inputs at their last valid logic state, preventing metastability or noise-induced switching.

What is the thermal resistance (θJA) of the SN74LVCH16952ADGVR in its TVSOP (DGV) package?

The SN74LVCH16952ADGVR in the TVSOP (DGV) package has a junction-to-ambient thermal resistance (θJA) of 48°C/W, as documented in the Absolute Maximum Ratings table. This value assumes standard JEDEC 2-layer board conditions (1-inch² copper pad, 2 oz Cu) and is critical for calculating maximum allowable power dissipation (Pd = (Tjmax – TA)/θJA) in thermally constrained applications.