Texas Instruments SN74LVCH16652ADGVR

Overview

SN74LVCH16652ADGVR from Texas Instruments is a 16-bit bus transceiver and register with 3-state outputs, designed for bidirectional data flow between A- and B-bus ports across two independent 8-bit channels. It operates from 1.65 V to 3.6 V, supports 5.5-V-tolerant inputs, delivers ≤6.3 ns propagation delay at 3.3 V, and features bus-hold on all data I/Os-enabling robust interface in server backplanes and mixed-voltage telecom systems.

For engineers reviewing the SN74LVCH16652ADGVR datasheet, SN74LVCH16652ADGVR pinout, SN74LVCH16652ADGVR application, or SN74LVCH16652ADGVR equivalent, key selection criteria include its dual-directional clocked register capability, I_off partial-power-down support, 24-mA output drive at 3.3 V, and TVSOP-56 package compatibility with high-density PCB layouts.

Technical Context

The SN74LVCH16652ADGVR integrates two independent 8-bit transceiver/register blocks, each with separate A→B and B→A clock (CLKAB/CLKBA), select (SAB/SBA), and output-enable (OEAB/OEBA) controls. Its D-type flip-flops latch data on low-to-high clock transitions regardless of OE or S state, enabling simultaneous storage and real-time pass-through modes.

It implements true mixed-mode signal operation: inputs tolerate up to 5.5 V while V_CC ranges from 1.65 V to 3.6 V, allowing direct interfacing between 3.3-V logic domains and legacy 5-V peripherals without external level shifters. Bus-hold circuitry actively maintains valid logic levels on floating data I/Os, eliminating external pull resistors.

Key Specifications

Pinout & Package

SN74LVCH16652ADGVR uses a 56-pin Thin Very Small Outline Package (TVSOP) with 11.30 mm × 4.40 mm body size and 0.4-mm lead pitch, optimized for high-density PCB layouts and automated surface-mount assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC16652DGGR and 74ALVCH16652TTR, SN74LVCH16652ADGVR uniquely supports 1.65-V operation, 5.5-V input tolerance, and guaranteed I_off behavior-making it the only option for ultra-low-voltage, mixed-rail, and hot-plug-critical designs.

Availability

SN74LVCH16652ADGVR is available at Aetrix Electronics and suitable for server backplanes, industrial PLCs, telecom line cards, and embedded expansion interfaces requiring stable component supply across extended temperature and mixed-voltage conditions.

Supply support for SN74LVCH16652ADGVR 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 for industrial, automotive, and communications markets.

The SN74LVCH16652ADGVR belongs to TI's Widebus™ family of high-speed, low-voltage CMOS transceivers-designed specifically for robust, mixed-voltage bus interfacing in high-reliability computing and infrastructure systems.

FAQ

What is the maximum clock frequency supported by SN74LVCH16652ADGVR?

SN74LVCH16652ADGVR supports a maximum clock frequency of 150 MHz across its full operating temperature range (–40°C to 125°C) and V_CC range (1.65 V to 3.6 V), as specified in the timing requirements tables for both 40°C–85°C and 40°C–125°C conditions. This enables reliable use in high-speed memory and data-path applications where precise edge-aligned sampling is required.

Does SN74LVCH16652ADGVR require external pull-up or pull-down resistors on data lines?

No, SN74LVCH16652ADGVR includes active bus-hold circuitry on all 32 data I/O pins (A1–A8, B1–B8 per channel), which maintains valid logic states on unused or floating inputs without external resistors. Using pull-up or pull-down resistors with enabled bus-hold is explicitly discouraged in the datasheet, as it may cause contention or increased power consumption.

Can SN74LVCH16652ADGVR interface directly between 5-V and 3.3-V logic domains?

Yes, SN74LVCH16652ADGVR accepts input voltages up to 5.5 V regardless of V_CC (1.65 V to 3.6 V), enabling direct connection to 5-V drivers while operating from a 3.3-V supply. Its outputs swing rail-to-rail within the V_CC domain, making it suitable as a unidirectional level translator without additional components.

How does the I_off feature function in SN74LVCH16652ADGVR during power-down?

When V_CC = 0 V, SN74LVCH16652ADGVR's I_off circuitry ensures that all I/O pins enter a high-impedance state and draw less than ±10 μA-preventing current backflow into powered sections of the system. This allows safe hot insertion/removal in modular backplanes and prevents corruption of adjacent powered circuits during partial power-down sequences.

What is the recommended power supply decoupling for SN74LVCH16652ADGVR?

Texas Instruments recommends placing a 0.01 μF or 0.022 μF ceramic capacitor near each of the four V_CC pins (7, 22, 35, 50) of SN74LVCH16652ADGVR, with optional parallel 0.1 μF and 1 μF capacitors for broadband noise suppression. All bypass capacitors must be placed as close as possible to their respective V_CC pins to minimize inductance and ensure stable high-speed switching performance.