Texas Instruments TXS0101YZPR

Overview

TXS0101YZPR from Texas Instruments is a 1-bit bidirectional auto-direction-sensing voltage-level translator for open-drain and push-pull logic interfaces, supporting 1.65V–3.6V on A port and 2.3V–5.5V on B port (VCCA ≤ VCCB), with 24Mbps push-pull and 2Mbps open-drain data rates, integrated 10kΩ pullups, and VCC isolation - deployed in smartphone baseband-to-peripheral I²C/SPI signal translation.

For engineers reviewing the TXS0101YZPR datasheet, TXS0101YZPR pinout, TXS0101YZPR application, or TXS0101YZPR equivalent, this page delivers verified electrical specs, package mapping to SON-6 (DRY), real-world timing behavior under VCCA = 1.8V/2.5V/3.3V and VCCB = 2.5V/3.3V/5V, thermal resistance values per package variant, and validated alternative options for dual-rail level-shifting designs.

Technical Context

The TXS0101YZPR implements a pass-gate architecture with edge-rate-accelerating one-shot circuits on both A and B ports to enhance low-to-high transition speed without direction-control logic. Its internal 10kΩ pullup resistors on each I/O eliminate external components in open-drain configurations.

It operates across two independent supply domains: VCCA powers the A-port interface and OE input (1.65V–3.6V), while VCCB powers the B port (2.3V–5.5V); VCC isolation ensures high-impedance state when either supply is at GND, and no power-supply sequencing is required during startup.

Key Specifications

Pinout & Package

TXS0101YZPR is packaged in the Texas Instruments NanoFree™ DRY (SON-6) package: 1.45mm × 1.0mm, 0.5mm pitch, wettable flank terminals, suitable for space-constrained mobile PCBs and automated optical inspection (AOI).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bidirectional level-shifting applications.

Compared with TXS0101YZPR, TXB0101RGTR offers higher speed but adds layout and control complexity, while SN74AVC1T45DBVR reduces cost at the expense of robustness and auto-direction capability - making TXS0101YZPR the optimal choice for space-constrained, mixed-voltage I²C/SMBus links requiring zero-footprint reliability.

Availability

TXS0101YZPR is available at Aetrix Electronics and suitable for smartphone baseband–PMIC interfaces, tablet sensor hub aggregation, and industrial HMI touch controller links requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TXS0101YZPR 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 and low-power design.

The TXS0101YZPR belongs to TI's voltage translation portfolio, engineered specifically for ultra-compact, auto-direction-sensing bidirectional level shifting in portable and power-sensitive applications - targeting I²C, SMBus, and GPIO interconnects across mismatched voltage domains.

FAQ

What is the maximum allowable voltage difference between VCCA and VCCB for reliable operation of TXS0101YZPR?

TXS0101YZPR requires VCCA ≤ VCCB at all times during normal operation. The absolute maximum ratings allow VCCA up to 4.6V and VCCB up to 6.5V independently, but functional operation mandates VCCA no greater than VCCB. For example, 3.3V on VCCA and 5.0V on VCCB is valid; 3.3V on VCCA and 2.5V on VCCB violates the VCCA ≤ VCCB condition and may cause undefined behavior or damage.

Does TXS0101YZPR support true bidirectional communication on a single I/O line without external direction control?

Yes, TXS0101YZPR supports true bidirectional communication on its A and B pins without any direction-control signal. Its internal pass-gate architecture with edge-detecting one-shot accelerators automatically senses signal direction based on voltage transitions, enabling seamless I²C SDA/SCL or SMBus DATA/CLK translation with no additional logic or timing overhead.

Can TXS0101YZPR be used in a 5V-to-1.8V push-pull configuration, and what are the timing implications?

TXS0101YZPR supports 5V-to-1.8V push-pull translation only when VCCB = 5V and VCCA = 1.8V (satisfying VCCA ≤ VCCB). Under these conditions, the typical propagation delay B→A is 2.6ns and A→B is 6.8ns at VCCA = 1.8V/VCCB = 5V, enabling reliable 12MHz SPI clocking with margin. Rise/fall times remain within specification due to one-shot acceleration.

How does the VCC isolation feature function in TXS0101YZPR during partial power-down sequences?

When either VCCA or VCCB is driven to GND, TXS0101YZPR forces both A and B ports into high-impedance state regardless of OE status. This prevents back-current flow through I/Os during staged power removal - for example, if VCCA is shut down while VCCB remains active, the B port will not source current into the powered-down A-side circuitry, protecting downstream logic.

What is the role of the internal 10kΩ pullup resistors in TXS0101YZPR, and can they be overridden?

The internal 10kΩ pullups on both A and B ports provide default termination for open-drain buses like I²C, eliminating external resistors. They can be overridden by adding lower-value external pullups in parallel - for instance, a 4.7kΩ resistor to VCCA reduces effective pullup to ~3.2kΩ, accelerating rise time on capacitive traces without altering DC logic levels.