Texas Instruments SN74AVC2T45YEPR

Overview

SN74AVC2T45YEPR 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 in high-speed interconnects between heterogeneous voltage-domain subsystems in portable computing and communications hardware.

For engineers reviewing the SN74AVC2T45YEPR datasheet, SN74AVC2T45YEPR pinout, SN74AVC2T45YEPR application, or SN74AVC2T45YEPR equivalent, key selection criteria include configurable dual-rail operation, direction-controlled data flow, guaranteed 240–500 Mbps data rates across voltage combinations, ±1000V CDM ESD rating, and NanoFree™ DSBGA-8 package compatibility with space-constrained PCB layouts.

Technical Context

This device implements a non-inverting, direction-pin-controlled transceiver architecture where DIR logic level selects active output port (A→B when DIR=H, B→A when DIR=L). Both A and B ports remain input-enabled at all times, requiring defined logic states to avoid CMOS leakage. The internal circuitry enforces VCC isolation: if either VCCA or VCCB = GND, both ports enter high-impedance state.

It supports true bidirectional level-shifting without external pull-ups or direction arbitration logic. Propagation delays range from 2.1 ns (A→B, VCCA=3.3V/VCCB=2.5V) to 3.4 ns (B→A, VCCA=1.2V/VCCB=1.2V), with enable/disable times under 8.5 ns. Power dissipation capacitance is as low as 3 pF per transceiver path at 1.2V operation.

Key Specifications

Pinout & Package

SN74AVC2T45YEPR uses the YZP (DSBGA-8) package: 1.89 mm × 0.89 mm, 0.4 mm pitch, bottom-terminal configuration. This NanoFree™ package eliminates leadframe and mold compound, reducing parasitic inductance and thermal resistance (RθJB = 10.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2T45DCUR and TXS0102DCUR, SN74AVC2T45YEPR delivers superior high-speed performance in minimal area, supports strict Ioff and VCC isolation for mixed-power-domain safety, and maintains full compatibility with direction-pin-based synchronous protocols-making it optimal for space-constrained, multi-rail portable electronics.

Availability

SN74AVC2T45YEPR is available at Aetrix Electronics and suitable for smartphone baseband interfaces, server memory subsystems, and notebook platform controller hubs requiring stable component supply across extended product lifecycles.

Supply support for SN74AVC2T45YEPR 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 personal electronics markets.

SN74AVC2T45YEPR belongs to TI's AVC logic family, engineered specifically for low-voltage, high-speed bidirectional level translation in battery-powered and thermally constrained portable devices.

FAQ

What voltage combinations does the SN74AVC2T45YEPR support for level-shifting?

The SN74AVC2T45YEPR supports all pairwise combinations between 1.2V, 1.5V, 1.8V, 2.5V, and 3.3V domains on its VCCA and VCCB rails. Each rail operates independently from 1.2V to 3.6V, enabling translation such as 1.2V↔3.3V, 1.8V↔2.5V, or 1.5V↔1.8V. The device guarantees specified timing and drive strength across these combinations, as validated in Sections 5.6–5.10 of the SN74AVC2T45YEPR datasheet.

Does the SN74AVC2T45YEPR require external pull-up resistors on its I/O lines?

No, the SN74AVC2T45YEPR does not require external pull-up resistors for normal operation. Its CMOS inputs have defined thresholds referenced to their respective supply rails (VCCA or VCCB), and outputs actively drive to rail-to-rail logic levels. However, unused inputs must be terminated to VCCI or GND to prevent floating states that cause excessive leakage current-per Section 5.3 of the SN74AVC2T45YEPR datasheet.

How does the VCC isolation feature protect system integrity in the SN74AVC2T45YEPR?

The VCC isolation feature in the SN74AVC2T45YEPR forces both A and B ports into high-impedance state if either VCCA or VCCB drops to GND. This prevents false logic levels from propagating across domains during power sequencing, brown-out, or hot-plug events. It eliminates risk of back-driving powered subsystems and avoids latch-up conditions-critical for reliable operation in multi-rail portable electronics using the SN74AVC2T45YEPR.

Can the SN74AVC2T45YEPR operate with VCCA = 1.2V and VCCB = 1.2V?

Yes, the SN74AVC2T45YEPR fully supports identical supply voltages on both rails, including VCCA = VCCB = 1.2V. In this configuration, it functions as a 2-bit buffer with direction control, delivering 2.4 ns typical propagation delay (A→B), ±3 mA drive strength, and 3 pF power-dissipation capacitance. All electrical characteristics-including Ioff, ESD ratings, and timing-are specified down to 1.2V per Section 5.3 of the SN74AVC2T45YEPR datasheet.

What is the maximum capacitive load the SN74AVC2T45YEPR can drive reliably?

The SN74AVC2T45YEPR is characterized to drive up to 15 pF load capacitance (CL) while maintaining specified timing and signal integrity, as shown in Figure 6-1 and Sections 5.6–5.10 of the datasheet. At 15 pF and VCCA=3.3V/VCCB=3.3V, tPLH/tPHL remains ≤2.4 ns. For loads exceeding 15 pF, propagation delay increases linearly-designers should verify timing margins in their specific SN74AVC2T45YEPR application using the CL vs. tpd curves in Figures 5-1 through 5-10.