Texas Instruments 74AVC16T245DGVRE4

Overview

74AVC16T245DGVRE4 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver enabling bidirectional voltage translation between 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V domains. It features independent A- and B-port supplies (VCCA/VCCB), tri-state outputs controlled by 1OE/2OE, direction control via 1DIR/2DIR, and I_off support for partial-power-down operation. It is used in mixed-voltage system interconnects such as CPU-to-peripheral data buses in industrial controllers.

For engineers reviewing the 74AVC16T245DGVRE4 datasheet, 74AVC16T245DGVRE4 pinout, 74AVC16T245DGVRE4 application, or 74AVC16T245DGVRE4 equivalent, key selection criteria include its 1.2 V–3.6 V dual-rail flexibility, 380 Mbps max data rate (1.8 V → 3.3 V), VCC isolation behavior, 4.6 V I/O tolerance, and TVSOP-48 package compatibility with high-density PCB layouts.

Technical Context

The 74AVC16T245DGVRE4 implements a fully configurable dual-rail architecture where the A port tracks VCCA (1.2 V–3.6 V) and the B port tracks VCCB (1.2 V–3.6 V), enabling asynchronous bidirectional level shifting without external biasing. Control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced solely to VCCA, decoupling logic thresholds from B-side supply variations.

Its functional modes are defined strictly by OE and DIR states: OE low enables translation (DIR high = A→B, DIR low = B→A); OE high forces both ports into high-impedance. The VCC isolation feature guarantees high-Z on both ports if either VCCA or VCCB is at GND, preventing bus contention during power sequencing.

Key Specifications

Pinout & Package

74AVC16T245DGVRE4 is packaged in a 48-pin TVSOP (DGV) with nominal body size 9.70 mm × 4.40 mm and 0.4 mm lead pitch. This thin, small-outline package supports high-density routing and automated assembly in space-constrained embedded systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC16T245DGGR and SN74LVC16T245DGVR, the 74AVC16T245DGVRE4 uniquely delivers 1.2 V dual-rail operation, VCC isolation, and 380 Mbps performance in the smallest 48-pin footprint - making it optimal for next-generation compact, mixed-voltage embedded systems.

Availability

74AVC16T245DGVRE4 is available at Aetrix Electronics and suitable for industrial PLC backplanes, server memory subsystems, automotive ADAS camera links, and telecom baseband interfaces requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 74AVC16T245DGVRE4 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 SN74AVC16T245 product line targets high-speed, low-voltage bidirectional bus interfacing in mixed-supply systems - designed specifically for seamless voltage translation across 1.2 V to 3.3 V domains without external circuitry.

FAQ

What voltage ranges does the 74AVC16T245DGVRE4 support on its A and B ports?

The 74AVC16T245DGVRE4 supports independent supply voltages from 1.2 V to 3.6 V on both VCCA (A port) and VCCB (B port). This enables translation between any combination of 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V logic domains. The control inputs (1DIR, 2DIR, 1OE, 2OE) are referenced exclusively to VCCA, ensuring consistent threshold behavior regardless of VCCB level. The 74AVC16T245DGVRE4 maintains full functionality across this entire range, including I_off and VCC isolation features.

How does the VCC isolation feature work in the 74AVC16T245DGVRE4?

The VCC isolation feature in the 74AVC16T245DGVRE4 ensures that if either VCCA or VCCB is driven to GND (e.g., during power-down sequencing), both A and B ports automatically enter a high-impedance state. This prevents false logic levels or bus contention when one side loses power while the other remains active. The behavior is intrinsic to the silicon design and requires no external circuitry. For reliable startup/shutdown, TI recommends tying OE to VCCA through a pull-up resistor to guarantee high-Z during power transitions. The 74AVC16T245DGVRE4 implements this function without additional control logic or configuration.

Can the 74AVC16T245DGVRE4 be used for unidirectional translation?

Yes, the 74AVC16T245DGVRE4 supports unidirectional operation by holding DIR constant (high for A→B, low for B→A) while using OE to enable/disable the path. Its dual 8-bit channels (1A/1B and 2A/2B) can be configured independently - for example, one channel for A→B and the other for B→A - enabling full-duplex communication. All timing parameters (propagation delay, enable/disable times) are specified for both directions and across all supported voltage combinations. The 74AVC16T245DGVRE4 does not require external direction-control logic when used unidirectionally, simplifying PCB layout versus discrete solutions.

What is the maximum data rate achievable with the 74AVC16T245DGVRE4?

The 74AVC16T245DGVRE4 achieves a maximum data rate of 380 Mbps when translating from 1.8 V to 3.3 V. Lower rates apply for other combinations: 200 Mbps for <1.8 V to 3.3 V or to 2.5 V/1.8 V, 150 Mbps to 1.5 V, and 100 Mbps to 1.2 V. These values reflect guaranteed AC performance under recommended operating conditions and are validated across temperature and voltage corners. The 74AVC16T245DGVRE4 maintains signal integrity at these speeds due to matched internal path delays and low output skew (<0.3 ns typical between channels), making it suitable for high-throughput parallel buses.

Does the 74AVC16T245DGVRE4 support partial-power-down operation?

Yes, the 74AVC16T245DGVRE4 is fully specified for partial-power-down operation via its I_off feature. When either VCCA or VCCB is at 0 V while the other supply is active, the I_off circuitry disables the corresponding I/O outputs, limiting reverse current to ±5 µA maximum. This prevents damaging backflow current through powered-down sections of a system - critical for hot-swap, power-gated, or modular architectures. The 74AVC16T245DGVRE4 maintains this specification across the full –40 °C to +85 °C temperature range and requires no external components to implement.