Texas Instruments CAVC1T45QDCKRQ1

Overview

CAVC1T45QDCKRQ1 from Texas Instruments is an automotive-grade single-bit dual-supply bus transceiver enabling bidirectional voltage translation between 1.08V and 3.6V domains, with ±12mA drive at 3.3V, 4.6V I/O tolerance, and VCC isolation. It supports up to 500Mbps data rate (1.08V→3.3V) and operates from –40°C to 125°C in SOT-23-6 (DCK) package for low-voltage interconnects in ADAS sensor hubs.

For engineers reviewing the CAVC1T45QDCKRQ1 datasheet, CAVC1T45QDCKRQ1 pinout, CAVC1T45QDCKRQ1 application, or CAVC1T45QDCKRQ1 equivalent, key selection criteria include dual-rail configurability (VCCA/VCCB = 1.08–3.6V), DIR-referenced control logic, Ioff-enabled partial-power-down, and AEC-Q100 Grade 1 qualification for automotive signal integrity.

Technical Context

The CAVC1T45QDCKRQ1 implements a noninverting, direction-controlled dual-rail architecture where DIR input is referenced to VCCA, and each port (A/B) tracks its respective supply rail independently. This enables asynchronous, bidirectional level translation without external biasing or direction-sensing logic.

Its VCC isolation feature forces both ports into high-impedance when either VCCA or VCCB is grounded, preventing bus contention during power sequencing. The Ioff circuitry disables outputs during partial power-down, blocking damaging backflow current while maintaining 4.6V I/O tolerance regardless of supply state.

Key Specifications

Pinout & Package

CAVC1T45QDCKRQ1 uses the DCK (SOT-23-6) package: 2.0mm × 2.1mm, 0.95mm height, 0.65mm pitch, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1T45QDCKRQ1 and TXS0101QPWRQ1, CAVC1T45QDCKRQ1 delivers superior speed (500Mbps), guaranteed automotive qualification, and higher output drive-making it the optimal choice for time-critical ADAS and gateway interfaces requiring robust dual-rail translation.

Availability

CAVC1T45QDCKRQ1 is available at Aetrix Electronics and suitable for ADAS camera interfaces, infotainment SoC bridges, body control modules, automotive gateways, and domain controllers requiring stable component supply across extended temperature ranges.

Supply support for CAVC1T45QDCKRQ1 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 and embedded processing solutions, with over 90 years of innovation in automotive, industrial, and communications markets.

The SN74AVC1T45-Q1 product line delivers AEC-Q100-qualified, dual-rail voltage translators designed specifically for automotive signal integrity in ADAS, infotainment, and electrification subsystems.

FAQ

What is the maximum supported data rate for CAVC1T45QDCKRQ1 in a 1.2V-to-3.3V translation configuration?

The CAVC1T45QDCKRQ1 supports up to 500Mbps when translating from 1.08V to 3.3V, as specified in the datasheet's typical maximum data rates table. At 1.2V-to-3.3V, this full bandwidth is maintained due to the device's optimized switching characteristics and low propagation delay (as low as 0.9ns at VCCA=3.3V/VCCB=3.3V). CAVC1T45QDCKRQ1 achieves this performance without external termination or biasing, making it suitable for MIPI CSI-2 and high-speed GPIO applications.

How does the VCC isolation feature function in CAVC1T45QDCKRQ1 during power sequencing?

The VCC isolation feature in CAVC1T45QDCKRQ1 forces both A and B ports into high-impedance state whenever either VCCA or VCCB is driven to GND, regardless of DIR state or input levels. This prevents bus contention and back-driving during asymmetric power-up sequences-common in automotive modules where sensor and host supplies ramp at different rates. CAVC1T45QDCKRQ1 implements this behavior via internal detection circuitry tied directly to the supply pins, requiring no external control.

Can CAVC1T45QDCKRQ1 safely interface with 5V logic despite its 3.6V supply rails?

Yes, CAVC1T45QDCKRQ1 supports 4.6V I/O tolerance on both A and B ports, allowing direct connection to 5V peripherals without external clamping diodes or resistive dividers. This tolerance applies regardless of VCCA or VCCB voltage (1.08–3.6V) and remains valid in high-impedance, active, or power-down states. CAVC1T45QDCKRQ1 maintains this rating across the full operating temperature range (–40°C to +125°C), meeting automotive robustness requirements.

What is the role of the DIR input in CAVC1T45QDCKRQ1, and how is it referenced?

The DIR input in CAVC1T45QDCKRQ1 controls data direction: HIGH enables A→B transfer, LOW enables B→A transfer. Critically, DIR is referenced to VCCA-not VCCB or a separate supply-ensuring consistent logic thresholds even when VCCB differs significantly. This design simplifies control logic integration, as the same supply powering the A-port I/O also defines the DIR threshold (VIH = VCCA × 0.65 min at 1.08–1.95V). CAVC1T45QDCKRQ1 requires DIR to be driven before enabling data flow to avoid metastability.

Does CAVC1T45QDCKRQ1 support partial-power-down operation, and how is it implemented?

Yes, CAVC1T45QDCKRQ1 supports partial-power-down via its Ioff feature: when either VCCA or VCCB is at 0V, the Ioff circuitry disables all I/O outputs, limiting leakage to ±1µA maximum across temperature. This prevents damaging backflow current when one side of the bus remains active while the other is powered down-essential for low-power modes in automotive ECUs. CAVC1T45QDCKRQ1 maintains 4.6V I/O tolerance during Ioff, preserving system-level ESD resilience without additional protection.