Texas Instruments CAVC2T45TDCURQ1

Overview

CAVC2T45TDCURQ1 from Texas Instruments is an automotive-grade dual-bit, dual-supply bus transceiver enabling bidirectional voltage translation between 1.2V–3.6V domains. It features configurable VCCA/VCCB rails, 4.6V I/O tolerance, Ioff partial-power-down support, and operates from –40°C to +105°C. It serves as a level-shifting interface in ADAS domain controllers interfacing 1.8V sensor hubs with 3.3V CAN/FlexRay communication subsystems.

For engineers reviewing the CAVC2T45TDCURQ1 datasheet, CAVC2T45TDCURQ1 pinout, CAVC2T45TDCURQ1 application, or CAVC2T45TDCURQ1 equivalent, key selection criteria include dual-rail voltage flexibility (1.2V–3.6V per port), DIR-controlled directionality, VCC isolation behavior, 500Mbps max data rate (1.8V→3.3V), and AEC-Q100 Grade 2 qualification for automotive powertrain and chassis modules.

Technical Context

The CAVC2T45TDCURQ1 implements a noninverting dual-transceiver architecture with independent A- and B-port supply rails (VCCA and VCCB), each supporting 1.2V–3.6V operation. Direction control is managed solely by the DIR input referenced to VCCA, eliminating need for external level shifters on the control line.

VCC isolation ensures both ports enter high-impedance state if either VCCA or VCCB is at GND, preventing false logic propagation. Ioff circuitry actively disables outputs during partial power-down, blocking backflow current when one rail is unpowered - critical for hot-swap and low-power sleep modes in automotive ECUs.

Key Specifications

Pinout & Package

CAVC2T45TDCURQ1 is packaged in an 8-pin VSSOP (DCU) package measuring 2.0mm × 3.1mm, optimized for space-constrained automotive PCB layouts and compatible with standard SMT reflow profiles.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2T45QDCURQ1 and TXS0102QPWRQ1, CAVC2T45TDCURQ1 uniquely delivers 1.2V operation, 500Mbps throughput, and VCC isolation - making it the only AEC-Q100-qualified option for next-generation automotive SoC interconnect requiring ultra-low-voltage compatibility and fault-resilient power management.

Availability

CAVC2T45TDCURQ1 is available at Aetrix Electronics and suitable for automotive ADAS sensor fusion, domain gateway interconnect, and infotainment SoC expansion requiring stable component supply, long-term lifecycle assurance, and AEC-Q100-compliant traceability.

Supply support for CAVC2T45TDCURQ1 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 automotive ICs, with over 90 years of innovation in high-reliability electronics.

The SN74AVC2T45-Q1 belongs to TI's automotive-qualified AVC logic family, engineered specifically for voltage translation in mixed-domain automotive ECUs where power efficiency, thermal resilience, and functional safety compliance are mandatory.

FAQ

What is the minimum operating voltage for VCCA and VCCB on the CAVC2T45TDCURQ1?

The CAVC2T45TDCURQ1 supports a minimum supply voltage of 1.2V on both VCCA and VCCB rails, enabling direct interfacing with ultra-low-voltage cores such as 1.2V LPDDR5 PHYs or 1.2V AI accelerators. This 1.2V capability is verified across the full –40°C to +105°C temperature range and is not achievable with standard LVC-family transceivers.

How does the DIR pin function on the CAVC2T45TDCURQ1, and what voltage reference does it use?

The DIR pin on the CAVC2T45TDCURQ1 is referenced exclusively to VCCA, not VCCB or an external reference. When DIR = HIGH (≥0.65×VCCA), the A-port drives the B-port; when DIR = LOW (≤0.35×VCCA), the B-port drives the A-port. This eliminates need for external level shifting on the control line, simplifying design in asymmetric voltage systems.

Does the CAVC2T45TDCURQ1 support hot-swapping or partial power-down scenarios?

Yes, the CAVC2T45TDCURQ1 fully supports partial power-down via its Ioff specification: outputs are actively disabled with leakage ≤±5μA when either VCCA or VCCB is at 0V, preventing damaging back-current flow. This behavior is validated per JESD78 Class II latch-up testing and is essential for automotive modules undergoing controlled rail sequencing during sleep/wake cycles.

What is the significance of VCC isolation in the CAVC2T45TDCURQ1, and how does it improve system reliability?

VCC isolation in the CAVC2T45TDCURQ1 forces both A and B ports into high-impedance state if either VCCA or VCCB drops to GND. This prevents false logic states from propagating across domains during power faults, brownouts, or hot-plug events - a critical feature for ISO 26262-compliant automotive systems where unintended actuator activation must be avoided.

Can the CAVC2T45TDCURQ1 translate between 1.2V and 3.3V while maintaining 500Mbps data rate?

Yes, the CAVC2T45TDCURQ1 achieves a maximum data rate of 500Mbps specifically in the 1.8V-to-3.3V translation direction. For 1.2V-to-3.3V translation, the rated maximum is 240Mbps per the switching characteristics table (Section 5.6). Designers must consult the applicable VCCA/VCCB combination in the datasheet's timing tables to ensure compliance with target interface speed requirements.