Texas Instruments TXU0202DCUR

Overview

TXU0202 from Texas Instruments is a dual-bit fixed-direction voltage-level translator IC with Schmitt-trigger inputs and 3-state outputs, supporting bidirectional level shifting between 1.1 V and 5.5 V rails, delivering up to 12 mA drive strength at 5 V, and operating across –40°C to +125°C for industrial and automotive I/O interfacing.

For engineers reviewing the TXU0202 datasheet, TXU0202 pinout, TXU0202 application, or TXU0202 equivalent, this device is selected for robust noise immunity in slow-signal environments (e.g., mechanical switch debouncing), push-pull level translation in UART/SPI/JTAG buses, and high-reliability GPIO bridging where VCC isolation and Ioff-float functionality are required.

Technical Context

The TXU0202 implements a dual-supply noninverting architecture with independent A- and B-port voltage references (VCCA and VCCB), enabling fixed-direction data flow either A→B or B→A under OE control. Its Schmitt-trigger inputs provide hysteresis (ΔVT = 0.2–1.18 V) to reject slow-rising or noisy signals, while integrated static pull-down resistors prevent floating inputs.

VCC isolation is enforced via Ioff-float: if either VCCA or VCCB drops below 100 mV or disconnects, all outputs enter high-impedance state. OE logic supports referencing to either supply rail, and the device maintains functional operation across full 1.1 V–5.5 V per port, with propagation delays as low as 8 ns (A→B, VCCA = 5.0 V, VCCB = 5.0 V, –40°C to 125°C).

Key Specifications

Pinout & Package

TXU0202 is available in three surface-mount packages: 8-pin VSSOP (DCU, 2.30 mm × 2.00 mm), 8-pin SON (DTT, 1.95 mm × 1.00 mm), and 8-pin X2SON (DTM, 1.35 mm × 0.80 mm). All variants share identical pin numbering and function mapping.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage-level translation applications.

Compared with TXB0102, TXU0202 adds Schmitt inputs, Ioff-float, and dual-supply OE control-making it superior for rugged industrial interfaces. Compared with TXU0102, TXU0202 supports true bidirectional signal routing, enabling flexible use in full-duplex serial links without redesigning signal paths.

Availability

TXU0202 is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and IoT edge node designs requiring stable component supply, extended temperature operation, and robust noise immunity in mixed-voltage systems.

Supply support for TXU0202 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 decades of expertise in precision signal conditioning and power-efficient interface solutions.

The TXU0x02 product line was designed specifically for reliable, low-power, mixed-voltage I/O bridging in space-constrained and thermally demanding applications-emphasizing noise resilience, supply independence, and drop-in upgrade paths from legacy translators.

FAQ

What is the maximum supported data rate for TXU0202 in a 3.3 V to 5.0 V translation configuration?

The TXU0202 supports up to 200 Mbps when translating from 3.3 V to 5.0 V, as specified in the official datasheet. This performance is validated under recommended operating conditions and accounts for worst-case propagation delay (tpd ≤ 8 ns) and enable/disable timing. The actual achievable rate in a given design depends on PCB layout, load capacitance, and signal integrity margins-but TXU0202 is engineered to meet this spec without external termination or buffering.

Does TXU0202 support bidirectional data flow between its A and B ports?

TXU0202 supports fixed-direction translation only: data flows either A→B or B→A depending on OE assertion and supply configuration-but not simultaneously in both directions on the same pin pair. It is not an auto-sensing bidirectional translator like I²C bus buffers. However, its dual independent channels (A1↔B1Y and A2Y↔B2) allow separate A→B and B→A paths within one device, enabling full-duplex UART or SPI signal routing without conflict.

How does the Ioff-float feature protect the system during partial power-down?

When either VCCA or VCCB falls below ~100 mV or becomes disconnected, the TXU0202 automatically places all outputs (A2Y and B1Y) into high-impedance state-preventing back-current injection into powered rails and eliminating bus contention. This behavior is intrinsic to the device's internal circuitry and requires no external control. For example, if a 3.3 V subsystem powers down while a 5 V domain remains active, TXU0202 isolates the two domains, protecting downstream components from unintended biasing.

Can the OE pin of TXU0202 be driven from either the A-side or B-side supply voltage?

Yes-the OE pin features VCC(MIN) circuitry that allows it to be asserted from either VCCA or VCCB logic levels. This eliminates the need for external level shifters on the enable signal, simplifying control in asymmetric voltage systems. For instance, a 1.8 V microcontroller can directly drive OE while interfacing with a 5 V peripheral via the B port, with no additional components required to translate the OE command.

What is the purpose of the integrated static pull-down resistors on TXU0202 inputs?

The integrated static pull-down resistors on all data inputs (A1, B2) and OE ensure defined logic states when external drivers are inactive or disconnected-preventing floating nodes that could cause erratic output behavior or increased power consumption due to shoot-through. These resistors are weak (leakage-limited, <2 µA), so they do not interfere with active driving but provide fail-safe biasing essential for robust operation in industrial and automotive environments where connector disconnection or open-circuit faults may occur.