Texas Instruments TXB0101DCKRG4

Overview

TXB0101DCKRG4 from Texas Instruments is a 1-bit bidirectional voltage translator with auto direction-sensing, supporting 1.2V–3.6V on A port and 1.65V–5.5V on B port (VCCA ≤ VCCB), ±15kV HBM ESD protection on B port, 5μA max ICC, and SC70-6 package. It enables level-shifting between low-voltage logic domains in space-constrained mobile interfaces.

For engineers reviewing the TXB0101DCKRG4 datasheet, TXB0101DCKRG4 pinout, TXB0101DCKRG4 application, or TXB0101DCKRG4 equivalent, key selection criteria include VCCA/VCCB voltage compatibility, auto-direction operation without control signals, high-impedance state during power sequencing, Ioff partial-power-down support, and 100 Mbps max data rate at 3.3V/5V translation.

Technical Context

The TXB0101DCKRG4 uses edge-accelerated buffered architecture with dual one-shot circuits per I/O path to enhance rise/fall times-PMOS for low-to-high and NMOS for high-to-low transitions-enabling up to 100 Mbps data rates. Its directionless operation eliminates external direction-control logic.

VCCA-referenced OE input controls 3-state output enable/disable; VCC isolation ensures all outputs enter high-impedance when either supply is at GND. Ioff circuitry prevents backflow current during partial power-down, meeting JESD78 Class II latch-up requirements.

Key Specifications

Pinout & Package

TXB0101DCKRG4 is packaged in SC70-6 (DCK), measuring 2.00 mm × 1.25 mm, with 0.65 mm pitch and exposed pad-less construction optimized for compact PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TXS0101DCKR and SN74AVC1T45DBVR, TXB0101DCKRG4 uniquely delivers auto-direction operation, VCC isolation, and ±15kV B-port ESD in a 2.0×1.25 mm SC70 package-making it optimal for space-constrained, dynamically powered mobile interfaces where control pin count and sequencing robustness are critical.

Availability

TXB0101DCKRG4 is available at Aetrix Electronics and suitable for smartphone, tablet, and handheld device designs requiring stable component supply, high-volume production scalability, and long-term lifecycle continuity.

Supply support for TXB0101DCKRG4 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 company specializing in analog, embedded processing, and connectivity technologies, with leadership in precision analog and low-power interface solutions.

The TXB0101 product line targets ultra-compact, low-power bidirectional voltage translation in portable electronics, emphasizing auto-direction sensing, robust ESD tolerance, and seamless integration into multi-rail SoC subsystems.

FAQ

What voltage ranges does TXB0101DCKRG4 support on its A and B ports?

TXB0101DCKRG4 supports 1.2V to 3.6V on the A port and 1.65V to 5.5V on the B port, with the strict requirement that VCCA must not exceed VCCB. This enables translation between common logic families including 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, and 5V domains. The device's auto-direction sensing operates reliably across this full range without external control signals.

Does TXB0101DCKRG4 require an external direction-control signal?

No, TXB0101DCKRG4 does not require an external direction-control signal. It features auto direction-sensing using internal edge-detection one-shot circuits that dynamically enable the appropriate output driver based on rising or falling edges at either port. This eliminates the need for a dedicated DIR pin and simplifies PCB layout and firmware design in bidirectional GPIO applications.

How does TXB0101DCKRG4 behave during power-up or power-down sequencing?

TXB0101DCKRG4 incorporates VCC isolation: if either VCCA or VCCB is at GND, all outputs automatically enter a high-impedance state, preventing bus contention. During power-up, no specific ramp order is required-VCCA may rise before or after VCCB without damage. When OE is held low, outputs remain in high-impedance regardless of supply status, enhancing system-level sequencing robustness.

What is the maximum data rate supported by TXB0101DCKRG4?

TXB0101DCKRG4 supports up to 100 Mbps maximum data rate, achieved when VCCA = 3.3V and VCCB = 3.3V or 5V. At lower voltages-e.g., VCCA = 1.2V-the max rate drops to 20 Mbps. Propagation delays range from 0.8 ns (A→B at 3.3V/3.3V) to 7.4 ns (B→A at 1.2V/1.8V), making TXB0101DCKRG4 suitable for high-speed GPIO, SPI, and UART translation in portable devices.

Can TXB0101DCKRG4 be used for I²C or SMBus level translation?

TXB0101DCKRG4 is not recommended for I²C or SMBus translation because it uses push-pull output drivers and lacks open-drain compatibility. Its architecture cannot support wired-AND bus arbitration. For I²C/SMBus, TI recommends the TXS0101 series, which features true open-drain outputs and integrated pull-up support. TXB0101DCKRG4 is optimized for push-pull CMOS logic such as GPIO, SPI, and UART.