Texas Instruments SN74AVC16T245DGVR

Overview

SN74AVC16T245 from Texas Instruments is a 16-bit dual-supply noninverting bus transceiver enabling bidirectional voltage-level translation between 1.2 V and 3.6 V domains. It features independent A- and B-port supplies (VCCA/VCCB), tri-state outputs controlled by DIR/OE, and supports up to 380 Mbps data rate (1.8 V → 3.3 V). It is used in mixed-voltage interconnects between processors, FPGAs, and peripherals in low-power embedded systems.

For engineers reviewing the SN74AVC16T245 datasheet, SN74AVC16T245 pinout, SN74AVC16T245 application, or SN74AVC16T245 equivalent, key selection criteria include dual-rail supply flexibility (1.2–3.6 V per port), Ioff partial-power-down support, VCC isolation behavior, 4.6 V I/O tolerance, and verified level-shifting performance across 1.2 V/1.5 V/1.8 V/2.5 V/3.3 V node combinations.

Technical Context

The SN74AVC16T245 implements asynchronous bidirectional translation using separate VCCA-referenced control inputs (1DIR, 2DIR, 1OE, 2OE) and VCCA/VCCB-referenced I/O banks (1A1–1A8, 2A1–2A8, 1B1–1B8, 2B1–2B8). Direction is determined per 8-bit channel via DIR signals, while OE independently places each channel's outputs in high-impedance state.

VCC isolation ensures both ports enter high-impedance if either VCCA or VCCB = GND; Ioff limits reverse current during partial power-down; and overvoltage-tolerant I/Os (to 4.6 V) permit safe operation when interfacing with higher-voltage logic despite low supply rails.

Key Specifications

Pinout & Package

The SN74AVC16T245DGVR uses a 48-pin TVSOP (DGV) package measuring 9.70 mm × 4.40 mm with 0.4 mm pitch. Pin functions are validated per TI SCES551F Rev. MARCH 2024.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH16T245 and TXB0108, the SN74AVC16T245 provides deterministic direction control, highest data rate (380 Mbps), and full 16-bit channel segmentation - making it the only option for timing-critical, high-bandwidth, manually directed interconnects in industrial and enterprise systems.

Availability

SN74AVC16T245 is available at Aetrix Electronics and suitable for industrial automation controllers, enterprise server management interfaces, and telecom baseband processing units requiring stable component supply across extended temperature and long product lifecycles.

Supply support for SN74AVC16T245 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 company specializing in analog, embedded processing, and connectivity technologies with broad industrial and automotive design-in leadership.

The SN74AVC16T245 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional level translation in space-constrained, power-sensitive systems operating across heterogeneous voltage nodes.

FAQ

What voltage ranges does the SN74AVC16T245 support on its A and B ports?

The SN74AVC16T245 supports independent supply voltages from 1.2 V to 3.6 V on both VCCA (A port) and VCCB (B port). This allows translation between any combination of standard low-voltage nodes including 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V. The device remains fully functional even when VCCA and VCCB differ - a core capability confirmed in TI's SCES551F datasheet Section 3.

How does the VCC isolation feature work in the SN74AVC16T245?

The VCC isolation feature in the SN74AVC16T245 ensures that if either VCCA or VCCB is driven to GND, both A and B ports automatically enter a high-impedance state. This prevents false logic levels or bus contention during power-up, power-down, or fault conditions. The behavior is hardware-enforced and requires no external circuitry - explicitly documented in Section 4 and Section 8.3.3 of the SN74AVC16T245 datasheet.

Can the SN74AVC16T245 be used in partial-power-down applications?

Yes, the SN74AVC16T245 is fully specified for partial-power-down applications using its Ioff feature. When either VCCA or VCCB is at 0 V, the Ioff circuitry disables output drivers to prevent damaging current backflow through the device. Maximum Ioff is ±5 µA at 3.6 V, as measured per Section 6.5 of the SN74AVC16T245 datasheet - enabling safe integration in dynamically powered subsystems.

What is the maximum data rate supported by the SN74AVC16T245?

The SN74AVC16T245 supports up to 380 Mbps when translating from 1.8 V to 3.3 V (Section 1, Features). Performance varies by voltage pair: 200 Mbps for <1.8 V → 3.3 V or level-shifting to 2.5 V/1.8 V, 150 Mbps to 1.5 V, and 100 Mbps to 1.2 V. These values are characterized switching speeds, not theoretical limits, and are validated across temperature and supply variations in Section 6.6–6.10.

Does the SN74AVC16T245 require external pull-up or pull-down resistors on control pins?

No external pull-up or pull-down resistors are required on DIR or OE pins of the SN74AVC16T245, as its control inputs are CMOS with rail-referenced VIH/VIL thresholds tied to VCCA. However, TI recommends tying OE to VCCA via a pull-up resistor during power-up/power-down to guarantee high-impedance state - a precautionary measure noted in Section 4 to prevent bus glitches before supply stabilization.