Texas Instruments CLXC8T245QRHLRQ1

Overview

CLXC8T245QRHLRQ1 from Texas Instruments is an AEC-Q100 qualified 8-bit dual-supply bus transceiver enabling bidirectional voltage level translation between 1.1 V and 5.5 V domains, with configurable direction control (DIR), 3-state outputs (OE), Schmitt-trigger inputs, and Ioff-float isolation. It supports up to 420 Mbps in 3.3 V → 5.0 V translation and operates across –40°C to +125°C for automotive infotainment and ADAS fusion interfaces.

For engineers reviewing the CLXC8T245QRHLRQ1 datasheet, CLXC8T245QRHLRQ1 pinout, CLXC8T245QRHLRQ1 application, or CLXC8T245QRHLRQ1 equivalent, key selection criteria include dual-rail supply flexibility (VCCA/VCCB = 1.1–5.5 V), guaranteed glitch-free power sequencing, integrated dynamic pull-down resistors on I/Os, static pull-downs on DIR/OE, and robust ±4000-V HBM ESD protection.

Technical Context

The CLXC8T245QRHLRQ1 implements a noninverting bidirectional translation architecture where A-port signals (Ax) and control logic (DIR, OE) are referenced to VCCA, while B-port signals (Bx) are referenced to VCCB - enabling independent voltage domain operation. Its Schmitt-trigger inputs tolerate slow or noisy waveforms, and internal pull-downs eliminate external biasing for floating controls or I/Os.

VCC isolation (Ioff-float) ensures all I/Os enter high-impedance state when either VCCA or VCCB drops below 100 mV, supporting partial-power-down modes. The device delivers up to 32 mA drive strength at 5 V and maintains ultra-low quiescent current: ≤4 µA at 25°C and ≤12 µA over –40°C to 125°C.

Key Specifications

Pinout & Package

RHL package: 24-pin VQFN (5.50 mm × 3.50 mm), thermally enhanced with exposed thermal pad (recommended grounded).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AVC8T245RHLR and TXS0108ERUKR, CLXC8T245QRHLRQ1 uniquely combines AEC-Q100 qualification, dual-supply configurability (1.1–5.5 V), Ioff-float isolation, and 420-Mbps performance - making it the only option qualified for high-reliability automotive data bridges requiring robust power sequencing and mixed-voltage interoperability.

Availability

CLXC8T245QRHLRQ1 is available at Aetrix Electronics and suitable for automotive infotainment head units, ADAS sensor fusion modules, and battery management interfaces requiring stable component supply across extended temperature and long product lifecycles.

Supply support for CLXC8T245QRHLRQ1 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 automotive, industrial, and personal electronics markets.

The SN74LXC8T245-Q1 belongs to TI's automotive-qualified LVC logic family, designed specifically for robust, low-power voltage translation in next-generation vehicle electronics with mixed-supply architectures.

FAQ

What is the maximum supported data rate for CLXC8T245QRHLRQ1 in 1.8-V to 3.3-V level translation?

The CLXC8T245QRHLRQ1 supports up to 210 Mbps in 1.8-V to 3.3-V up-translation mode, as specified in Table 6.12 (TMAX) of the datasheet under "Up Translation" with VCCI = 1.65 V–1.95 V and VCCO = 3.0 V–3.6 V. This rating applies across the full operating temperature range (–40°C to +125°C) and accounts for 50% duty cycle input with defined pulse amplitude thresholds.

Does CLXC8T245QRHLRQ1 require external pull-up or pull-down resistors on DIR and OE pins?

No. CLXC8T245QRHLRQ1 integrates static pull-down resistors on DIR and OE inputs, allowing these control pins to be left unconnected (floating) without risk of undefined logic states. This eliminates the need for external biasing components and simplifies PCB layout - a confirmed design feature documented in the "Features" section of the datasheet.

How does the Ioff-float feature behave when VCCA is powered but VCCB is disconnected?

When VCCB is disconnected (or falls below 100 mV) while VCCA remains powered, the CLXC8T245QRHLRQ1 activates its Ioff-float feature: all B-port I/Os (B1–B8) are first pulled down, then transition to high-impedance. A-port I/Os remain functional but isolated from B-port leakage - preventing backfeeding and ensuring safe partial-power-down operation as verified in Section 6.5 (Ioff-float parameter).

Can CLXC8T245QRHLRQ1 interface between a 1.1-V FPGA I/O bank and a 5.0-V microcontroller peripheral?

Yes. CLXC8T245QRHLRQ1 explicitly supports VCCA = 1.1 V and VCCB = 5.0 V operation, with verified 15–30 Mbps data rates in this configuration (Table 6.12). Its Schmitt-trigger inputs tolerate slow edges from low-voltage FPGA outputs, and its 32-mA drive strength at 5 V ensures clean signal integrity into the microcontroller's input stage.

What thermal metrics apply to the RHL (VQFN) package of CLXC8T245QRHLRQ1?

The RHL package of CLXC8T245QRHLRQ1 has RθJA = 47.4°C/W, RθJC(bottom) = 14.9°C/W, and RθJB = 25.1°C/W (Table 6.4). These values assume JEDEC-standard PCB mounting with 2-oz copper and thermal vias under the exposed pad - enabling reliable operation at full drive strength (32 mA) within the –40°C to +125°C ambient range without forced airflow.