Texas Instruments TXS02612RTWR

Overview

TXS02612RTWR from Texas Instruments is a 6-to-12 SDIO port expander with integrated voltage-level translation across three independent supply rails (VCCA, VCCB0, VCCB1), supporting 1.1 V to 3.6 V operation per rail. It implements a 6-channel SPDT switch architecture to route SDIO signals (CLK, CMD, DAT0–DAT3) between one A-port (baseband) and two selectable B-ports (e.g., SD card + Bluetooth/WLAN peripheral), enabling dual-SDIO-peripheral connectivity in mobile handsets.

For engineers reviewing the TXS02612RTWR datasheet, TXS02612RTWR pinout, TXS02612RTWR application, or TXS02612RTWR equivalent, this device addresses critical SDIO interface expansion needs where voltage mismatch exists between baseband processors and peripherals, requiring precise timing skew control (<0.7 ns channel-to-clock), low propagation delay (as low as 3.0 ns), and robust ESD protection (±8-kV contact discharge on B ports).

Technical Context

The TXS02612RTWR uses bidirectional CMOS switch topology with integrated level-shifting circuitry that dynamically adjusts pull-up resistance (70 kΩ ±30% when deselected) and supports push-pull or open-drain driving modes. Its SEL input-referenced to VCCA-controls B0/B1 port selection, with unselected B-port clock held low and data/command lines weakly pulled to their respective VCCB rail.

Internal architecture separates A-port and B-port signal paths with dedicated speed-up circuitry for A-to-B and B-to-A translation, and includes independent power domains with no internal connection between VCCA, VCCB0, and VCCB1. Power-up sequencing mandates grounding first, then VCCA, then VCCB0/VCCB1 to prevent bus contention or excessive current.

Key Specifications

Pinout & Package

TXS02612RTWR is housed in a 24-pin Wettable Flank Quad Flat No-Lead (WQFN) package (RTW), 4 mm × 4 mm, 0.5 mm pitch, with exposed center pad that must be connected to ground or left electrically open. Pin numbering follows top-view layout with Pin 1 at Q2 quadrant per tape-and-reel specification.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SDIO port expansion applications.

Compared with TXS02612ZQSR, the TXS02612RTWR provides identical SDIO switching performance in a more manufacturable WQFN package, while TS3USB30E serves a fundamentally different interface protocol and cannot replace TXS02612RTWR in SDIO applications.

Availability

TXS02612RTWR is available at Aetrix Electronics and suitable for smartphone baseband expansion, multi-peripheral SDIO hub designs, and mobile handset SDIO switching requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TXS02612RTWR 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 interface and power management ICs for portable electronics.

The TXS02612RTWR belongs to TI's SDIO port expander product line, designed specifically to solve voltage-domain bridging and interface multiplexing challenges in mobile and wireless devices with multiple SDIO peripherals.

FAQ

What is the primary function of the TXS02612RTWR in an SDIO system?

The TXS02612RTWR functions as a 6-to-12 SDIO port expander that routes a single baseband SDIO interface (CLK, CMD, DAT0–DAT3) to either of two independent peripheral ports (B0 or B1) using SEL-controlled SPDT switching. It integrates voltage-level translation across three isolated supply rails (VCCA, VCCB0, VCCB1), enabling interoperability between baseband processors and SDIO peripherals operating at different voltages - all within the TXS02612RTWR's specified 1.1 V to 3.6 V range per rail.

How does the TXS02612RTWR handle power sequencing to avoid bus contention?

The TXS02612RTWR requires strict power-up sequencing: (1) GND must be connected first; (2) VCCA is powered next to initialize internal SEL logic; (3) SEL is then set high or low depending on desired B-port; (4) VCCB0 and VCCB1 are applied last. This sequence prevents undefined states, excessive supply current, or oscillations. The TXS02612RTWR datasheet explicitly defines this order to ensure reliable operation - deviating risks malfunction or damage during startup.

What is the maximum supported SDIO data rate for the TXS02612RTWR?

The TXS02612RTWR supports up to 120 Mbps for command and data signals under push-pull driving conditions across all VCCA/VCCB combinations (1.1 V to 3.6 V). This meets the timing requirements of high-speed SDIO modes including SDIO 3.0 UHS-I. Clock frequency is rated up to 60 MHz under the same conditions. Open-drain operation limits data rate to 2 Mbps - intended only for legacy or low-speed peripherals.

Does the TXS02612RTWR provide ESD protection, and if so, what level?

Yes, the TXS02612RTWR provides robust ESD protection: ±8-kV contact discharge per IEC 61000-4-2 on all B-port pins (DATxB0/B1, CMDB0/B1, CLKB0/B1), and 2-kV HBM (Human-Body Model) on A-port pins. This level of protection is specifically engineered for direct connection to handheld device peripherals subject to frequent handling, ensuring reliability without requiring additional external ESD components on the B-side interface.

Can the TXS02612RTWR operate with different supply voltages on VCCB0 and VCCB1 simultaneously?

Yes, the TXS02612RTWR supports independent operation of VCCB0 and VCCB1 at different voltages - for example, VCCB0 = 3.3 V for an SD memory card and VCCB1 = 1.8 V for a Bluetooth module - while both remain within the 1.1 V to 3.6 V range. There is no internal connection between the two B-port supplies, and the device maintains full signal integrity and level translation for each domain independently, as confirmed in the functional description and recommended operating conditions table.