Texas Instruments SN74AVC2T45DCURE4

Overview

SN74AVC2T45 from Texas Instruments is a 2-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V domains. It features independent VCCA (1.2–3.6V) and VCCB (1.2–3.6V) rails, 4.6V I/O overvoltage tolerance, Ioff partial-power-down support, and VCC isolation. It serves as a configurable interface IC in high-density portable systems requiring low-voltage interconnect.

For engineers reviewing the SN74AVC2T45 datasheet, SN74AVC2T45 pinout, SN74AVC2T45 application, or SN74AVC2T45 equivalent, key selection criteria include dual-rail level-shifting capability, DIR-controlled directionality, 500Mbps max data rate (1.8V→3.3V), ±100mA latch-up immunity, and NanoFree™ package compatibility with space-constrained PCB layouts.

Technical Context

This device implements asynchronous, non-inverting bidirectional data transfer using a single DIR control input to select A→B or B→A path activation. Both A and B ports remain input-active regardless of DIR state, requiring defined logic levels on all I/Os to prevent CMOS leakage.

The transceiver's dual-rail architecture enables true universal translation: A-port I/Os track VCCA (1.2–3.6V), B-port I/Os track VCCB (1.2–3.6V), and the DIR input is referenced to VCCA. VCC isolation ensures both ports enter high-impedance when either VCCA or VCCB = GND, preventing false logic propagation.

Key Specifications

Pinout & Package

SN74AVC2T45DCURE4 uses the DCU (VSSOP-8) package: 2.30mm × 2.00mm body, 0.5mm pitch, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0102DCUR and SN74LVC2T45DCUR, SN74AVC2T45DCURE4 uniquely provides dual-rail independence, VCC isolation, and 4.6V I/O tolerance - making it the only option among the three qualified for mixed-voltage hot-swap and safety-critical power sequencing scenarios.

Availability

SN74AVC2T45DCURE4 is available at Aetrix Electronics and suitable for mobile baseband interfaces, server memory subsystems, and notebook platform power management requiring stable component supply, long-term lifecycle support, and RoHS-compliant VSSOP packaging.

Supply support for SN74AVC2T45DCURE4 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 and embedded processing technologies, with leadership in precision analog, power management, and high-performance interface solutions.

SN74AVC2T45 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, designed specifically for ultra-low-voltage bidirectional level shifting in space-constrained, multi-rail portable and computing systems.

FAQ

What is the maximum supported data rate for SN74AVC2T45DCURE4?

The SN74AVC2T45DCURE4 supports up to 500Mbps when translating from 1.8V to 3.3V, 320Mbps for sub-1.8V to 3.3V or level-shifting to 2.5V/1.8V, 280Mbps to 1.5V, and 240Mbps to 1.2V. These rates are validated under specified load and switching conditions per TI's SCES531N datasheet, and actual performance depends on PCB layout, termination, and signal integrity margins.

Does SN74AVC2T45DCURE4 require external pull-up or pull-down resistors?

No - SN74AVC2T45DCURE4 does not require external pull-up or pull-down resistors on its I/O pins. However, all unused data inputs must be actively driven to VCCI or GND to prevent excess CMOS leakage current; floating inputs are strictly prohibited per TI's design guidelines in section 5.3.

Can SN74AVC2T45DCURE4 operate with VCCA = 1.2V and VCCB = 3.3V simultaneously?

Yes - SN74AVC2T45DCURE4 is explicitly rated for simultaneous operation across the full 1.2V–3.6V range on each rail. With VCCA = 1.2V and VCCB = 3.3V, it achieves 240Mbps data rate and maintains 4.6V I/O tolerance on all pins, enabling direct interface between ultra-low-power sensors and legacy 3.3V peripherals.

What is the purpose of the VCC isolation feature in SN74AVC2T45DCURE4?

The VCC isolation feature ensures that if either VCCA or VCCB drops to GND, both A and B ports automatically enter a high-impedance state. This prevents false logic assertion, back-current flow, or bus contention during power-up/down sequencing - a critical safeguard in systems with staggered rail activation or fault recovery.

Is SN74AVC2T45DCURE4 compatible with the NanoFree™ package footprint?

Yes - SN74AVC2T45DCURE4 is packaged in the DCU (VSSOP-8) variant, which is part of TI's NanoFree™ technology family. It uses die-as-package construction with 2.30mm × 2.00mm body size and 0.5mm pitch, offering superior thermal performance and board-space efficiency compared to traditional SOIC or TSSOP packages.