Texas Instruments SN74AVC2T45DCTRE4

Overview

SN74AVC2T45DCTRE4 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 core interface IC in multi-voltage SoC interconnects, such as between application processors and memory or peripheral buses.

For engineers reviewing the SN74AVC2T45DCTRE4 datasheet, SN74AVC2T45DCTRE4 pinout, SN74AVC2T45DCTRE4 application, or SN74AVC2T45DCTRE4 equivalent, key selection criteria include configurable dual-rail operation, DIR-controlled directionality, guaranteed 500Mbps data rate (1.8V→3.3V), ±100mA latch-up immunity, and NanoFree™ DCT (SSOP-8) package compatibility with space-constrained portable designs.

Technical Context

This device implements a non-inverting, asynchronous bidirectional transceiver architecture with separate A-port (VCCA-referenced) and B-port (VCCB-referenced) I/O banks. Direction control is managed solely by the DIR input referenced to VCCA, with no OE pin - enabling simple two-wire bus arbitration in systems where master/slave roles are fixed per transaction.

The internal circuitry enforces strict power sequencing independence: VCC isolation forces both ports into high-impedance when either VCCA or VCCB = 0V, and Ioff limits leakage to ±5µA when either supply is off. Input thresholds scale with respective VCC rails, ensuring robust logic interpretation across mixed-voltage interfaces without external biasing.

Key Specifications

Pinout & Package

SN74AVC2T45DCTRE4 is packaged in an 8-pin SSOP (DCT) with 2.95mm × 2.80mm body size and 0.65mm lead pitch, part of TI's NanoFree™ family - die-as-package construction minimizing parasitic inductance for high-speed signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVCH2T45DCTRE4 and TXS0102DCUR, SN74AVC2T45DCTRE4 delivers the highest data rate (500Mbps), widest supply range (1.2–3.6V), and lowest static power (10µA), making it the preferred choice for high-speed, low-voltage, direction-controlled parallel interfaces where bus-hold or auto-direction are unnecessary.

Availability

SN74AVC2T45DCTRE4 is available at Aetrix Electronics and suitable for smartphone baseband interconnects, server memory buffer interfaces, and industrial sensor hub designs requiring stable component supply, long-term lifecycle assurance, and TI-authorized traceability.

Supply support for SN74AVC2T45DCTRE4 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 connectivity technologies, with over 90 years of innovation in high-reliability electronic components.

SN74AVC2T45DCTRE4 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional level translation in portable, battery-powered, and space-constrained systems.

FAQ

What is the maximum supported data rate for SN74AVC2T45DCTRE4 in a 1.8V-to-3.3V level-shifting configuration?

The SN74AVC2T45DCTRE4 supports up to 500Mbps when translating from 1.8V (VCCA) to 3.3V (VCCB), as specified in the "Max Data Rates" section of the datasheet. This performance is validated under recommended operating conditions with CL = 15pF and proper PCB layout - including controlled impedance traces and minimized stub lengths - to maintain signal integrity at high frequencies.

Does SN74AVC2T45DCTRE4 require external pull-up resistors on the DIR pin?

No, SN74AVC2T45DCTRE4 does not integrate internal pull-up or pull-down resistors on the DIR pin. The DIR input is referenced to VCCA and must be driven actively to a valid logic HIGH (≥VCCA × 0.65) or LOW (≤VCCA × 0.35). Leaving DIR floating risks undefined direction states and excessive CMOS leakage; a dedicated GPIO or logic gate output is required for reliable operation of SN74AVC2T45DCTRE4.

Can SN74AVC2T45DCTRE4 operate with VCCA = 1.2V and VCCB = 3.3V simultaneously?

Yes, SN74AVC2T45DCTRE4 is fully specified for simultaneous operation with VCCA = 1.2V and VCCB = 3.3V. In this configuration, the A-port I/Os swing between 0V and 1.2V (referenced to VCCA), while the B-port I/Os swing between 0V and 3.3V (referenced to VCCB), with 4.6V overvoltage tolerance protecting B-port pins. Propagation delay increases to ~3.2ns (typical), and data rate is rated at 240Mbps per the datasheet.

How does the VCC isolation feature function in SN74AVC2T45DCTRE4 during power sequencing?

When either VCCA or VCCB drops to GND, the internal VCC isolation circuitry forces both A-port and B-port I/Os into a high-impedance state - regardless of DIR state or input levels. This prevents back-current flow, avoids false logic assertions on live buses, and eliminates the need for external isolation switches. The feature activates within nanoseconds of supply collapse and is intrinsic to SN74AVC2T45DCTRE4's design, requiring no external components or firmware control.

Is SN74AVC2T45DCTRE4 compatible with JEDEC JESD78 Class II latch-up testing?

Yes, SN74AVC2T45DCTRE4 exceeds JEDEC JESD78 Class II latch-up immunity with a minimum rating of 100mA. This specification is verified per standard test methodology and ensures robust operation in electrically noisy environments - such as industrial motor drives or automotive ECUs - where transient ground shifts or supply coupling could otherwise trigger destructive latch-up events in less-rugged transceivers.