TXU0202DCUR

Overview

The TXU0202DCUR is a dual-bit, fixed-direction voltage-level translator manufactured by Texas Instruments. It operates with independent VCCA and VCCB supplies ranging from 1.08 V to 5.5 V. The device supports data rates up to 200 Mbps at 3.3 V to 5.0 V logic levels. It features Schmitt-trigger inputs for noise immunity and provides 3-state outputs. The OE pin controls output enablement relative to either supply rail. It is housed in an 8-pin VSSOP package.

Feature Summary

• Dual-rail design allows each port to operate independently across the full voltage range
• Schmitt-trigger inputs ensure clean signal transitions for slow or noisy inputs
• Integrated static pull-down resistors prevent channel floating when undefined
• Ioff-float feature disables outputs and creates high-impedance states during partial-power-down

Applications

• Eliminating slow or noisy input signals
• Driving indicator LEDs or buzzers
• Debouncing mechanical switches
• General purpose I/O level shifting
• Push-pull level shifting for UART, SPI, and JTAG interfaces

Procurement Notes

Verify the specific DCUR suffix corresponds to the VSSOP-8 package configuration required for your PCB layout. Confirm that the fixed-direction functionality aligns with your system architecture, as this component does not support bidirectional automatic direction detection. Ensure power supply sequencing meets the recommended operating conditions to maintain proper logic state integrity.

Selection Notes

Select this component when a fixed unidirectional translation path is sufficient for the application. It is suitable for systems requiring high drive strength and robust noise rejection via Schmitt triggers. Consider the TXS0102 if bidirectional automatic direction sensing is necessary instead of manual control via the OE pin. Verify thermal requirements against the junction-to-ambient resistance values provided in the datasheet.

Part Context

This device belongs to the TXU0x02 family of 2-bit unidirectional voltage-level translators. It shares pinout compatibility with the TXB family, allowing for drop-in replacements in existing designs where higher drive strength is needed. The TXU0102 variant offers a similar function but is optimized for common-direction GPIO translation applications.

Replacement Considerations

TXB0102: Pin-compatible alternative; however, it lacks the high drive strength and specific Ioff characteristics of the TXU0202.

FAQ

How does the OE pin function regarding reference voltage?

The Output Enable (OE) pin can be referenced to either the VCCA or VCCB logic level. Pulling it low disables all outputs to a high-impedance state, while pulling it high enables them.

What happens if one of the supply voltages drops below 100 mV?

If either VCCA or VCCB is disconnected or falls below 100 mV, the Ioff-float feature activates, disabling all outputs and placing them in a high-impedance state to support partial-power-down mode.