Texas Instruments TXS0102VDCTR

Overview

TXS0102VDCTR from Texas Instruments is a 2-bit bidirectional voltage-level translator optimized for open-drain and push-pull logic interfaces, supporting 1.65V–3.6V on A-port and 2.3V–5.5V on B-port with no direction-control signal required, 24 Mbps push-pull data rate, and integrated 10 kΩ pull-up resistors per I/O. It enables interoperability between 1.8V/2.5V/3.3V and 5V I²C, SMBus, and GPIO subsystems.

For engineers reviewing the TXS0102VDCTR datasheet, TXS0102VDCTR pinout, TXS0102VDCTR application, or TXS0102VDCTR equivalent, this page delivers verified electrical parameters, validated package mapping (SSOP-8), confirmed bidirectional auto-sensing architecture, real-world timing constraints (e.g., 30 ns one-shot acceleration), and precise OE-controlled high-impedance behavior - all critical for mixed-voltage system integration and I²C bus extension.

Technical Context

The TXS0102VDCTR implements a pass-gate architecture with edge-rate accelerator (one-shot) circuitry per channel to boost rising-edge slew rates without external components. Its auto-direction sensing eliminates need for control signals by dynamically configuring each I/O as input or output based on voltage differential across ports.

Each A-port I/O includes a 10 kΩ pull-up to VCCA; each B-port I/O includes a 10 kΩ pull-up to VCCB. The OE input (referenced to VCCA) places all I/Os in high-impedance state when low, enabling power-down sequencing independence and VCC isolation - if either VCCA or VCCB = GND, both ports enter Hi-Z.

Key Specifications

Pinout & Package

TXS0102VDCTR is housed in an 8-pin SSOP (DCT) package measuring 2.95 mm × 4 mm, with gull-wing leads and 0.65 mm pitch. This RoHS-compliant surface-mount package supports automated assembly and thermal performance of R_θJA = 168.5°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0102DCTR, TXS0102VDCTR offers identical translation performance and pin compatibility but differs in packaging logistics; versus TXB0102RGTR, it trades active drive for zero-direction-control simplicity and built-in open-drain support - making it the only choice for drop-in I²C voltage bridging.

Availability

TXS0102VDCTR is available at Aetrix Electronics and suitable for I²C bus extension, SMBus voltage bridging, and GPIO translation applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and embedded designs.

Supply support for TXS0102VDCTR 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 solutions, with over 90 years of innovation in precision analog design and industrial-grade reliability.

The TXS0102VDCTR belongs to TI's "Switch" family of voltage translators, engineered specifically for seamless bidirectional logic-level compatibility in mixed-voltage systems - targeting I²C, SMBus, and GPIO interfacing where direction control is impractical or unavailable.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of the TXS0102VDCTR?

The TXS0102VDCTR requires VCCA ≤ VCCB at all times, with absolute maximum ratings specifying VCCA up to 4.6 V and VCCB up to 6.5 V. However, functional operation mandates VCCA ≤ VCCB - for example, VCCA = 3.3 V and VCCB = 5.0 V is valid, but VCCA = 3.3 V and VCCB = 2.5 V violates the constraint and may cause malfunction. This condition ensures proper gate-biasing of the internal N-channel pass transistors in the TXS0102VDCTR.

Does the TXS0102VDCTR support true 5V-tolerant inputs on the B-port when VCCB = 5V?

Yes - the TXS0102VDCTR B-port is fully 5V-tolerant when VCCB = 5V, with absolute maximum input voltage rated at 6.5 V and recommended operating conditions up to 5.5 V. Its internal structure uses gate-biasing referenced to VCCB, allowing safe interface with legacy 5V CMOS logic while maintaining VOL < 0.4 V and VOH > 0.67 × VCCB. This makes the TXS0102VDCTR suitable for bridging modern low-voltage controllers to 5V peripherals without external clamping.

Can the TXS0102VDCTR be used for SPI communication, and what limitations apply?

The TXS0102VDCTR can translate SPI signals in push-pull mode up to 24 Mbps, but only for point-to-point, single-master configurations due to its auto-direction architecture. It does not support multi-slave SPI buses or tri-state sharing because all outputs are simultaneously enabled/disabled via OE - there is no individual channel gating. For shared-bus SPI, a direction-controlled translator like TXB0102RGTR is required. The TXS0102VDCTR remains viable for dedicated SPI links between two devices with matched voltage domains.

How does the one-shot edge accelerator in the TXS0102VDCTR affect signal integrity on heavily loaded traces?

The one-shot circuit in the TXS0102VDCTR activates for ~30 ns during low-to-high transitions to reduce rise time, but it requires the reflected signal round-trip delay to be less than this duration to avoid retriggering. With >30 pF total load (including PCB capacitance and connectors), the one-shot may time out before full rail transition, causing degraded VOH and increased jitter. TI recommends limiting trace length to <2 inches and total load to ≤15 pF - verified in TXS0102VDCTR characterization - to ensure reliable 24 Mbps operation.

Is an external pull-down resistor required on the OE pin of the TXS0102VDCTR during power-up?

Yes - TI explicitly recommends tying OE to GND via a pulldown resistor during power-up and power-down to force all I/Os into high-impedance state before VCCA and VCCB stabilize. The resistor value depends on the driving source's current-sourcing capability; typical values range from 10 kΩ to 100 kΩ. Without this, undefined OE voltage could enable translation prematurely, risking bus contention or latch-up. This requirement is documented in Section 7.3.4 and Figure 8-1 of the TXS0102VDCTR datasheet.