Texas Instruments TUSB213RGYT

Overview

TUSB213RGYT from Texas Instruments is a USB 2.0 High-Speed signal conditioner IC designed to restore signal integrity in lossy USB channels. It compensates for inter-symbol interference (ISI) in HS (480 Mbps) signals while transparently passing LS/FS traffic, supports up to 5 m pre-channel or 2 m post-channel cable lengths, and features programmable AC/DC boost via EQ and DC_BOOST pins for compliance with USB electrical specifications in notebooks, docking stations, and active cables.

For engineers reviewing the TUSB213RGYT datasheet, TUSB213RGYT pinout, TUSB213RGYT application, or TUSB213RGYT equivalent, key selection considerations include its dual-port HS signal conditioning architecture, tri-level DC boost (40/60/80 mV), four-level AC boost via external resistor, I²C or pin-strap configuration mode, and VQFN-14 (3.5 mm × 3.5 mm) package with thermal pad.

Technical Context

The TUSB213RGYT implements a patent-pending, host/device-agnostic signal conditioning architecture that operates only on USB 2.0 High-Speed differential pairs (D1P/D1M and D2P/D2M), leaving Low-Speed and Full-Speed signaling unaltered. Its compensation engine combines adjustable AC gain (via EQ pin pulldown resistor) and DC offset correction (via DC_BOOST pin voltage level) to counteract channel loss-induced eye closure.

It supports two configuration modes: pin-strapped (default) using EQ and DC_BOOST voltage levels sampled at RSTN de-assertion, or I²C mode (address 0x2C) for dynamic register access to ACB_LVL (0x01), DCB_LVL (0x0E), and CFG_ACTIVE (0x03). The device asserts ENA_HS and CD status flags and provides a 1.8-V VREG LDO output only during HS operation.

Key Specifications

Pinout & Package

VQFN-14 (RGY) package, 3.50 mm × 3.50 mm body size, exposed thermal pad (Pin 1), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 2.0 signal conditioning applications.

Compared with TS3USB221ERSER and USB2514B-AEZG, the TUSB213RGYT delivers dedicated, tunable HS signal restoration without switching logic or hub overhead-making it optimal for single-link integrity repair where minimal BOM count, zero firmware dependency, and precise AC/DC gain control are critical.

Availability

TUSB213RGYT is available at Aetrix Electronics and suitable for notebook design, docking station development, and active cable manufacturing requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for TUSB213RGYT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.

The TUSB213RGYT belongs to TI's USB signal conditioning product line, engineered specifically to solve high-speed signal degradation in USB 2.0 host, device, and cable applications-enabling robust electrical compliance without PHY replacement or PCB redesign.

FAQ

What is the primary function of the TUSB213RGYT in a USB 2.0 system?

The TUSB213RGYT is a dedicated USB 2.0 High-Speed signal conditioner that restores signal integrity by compensating for inter-symbol interference (ISI) and channel loss. It actively boosts AC and DC components of the 480 Mbps differential signal while leaving Low-Speed and Full-Speed traffic completely unaffected. This allows the TUSB213RGYT to help systems pass USB-IF electrical compliance tests-especially near-end and far-end eye mask requirements-without altering existing USB protocol stack or PHY behavior.

How does the TUSB213RGYT handle USB Low-Speed and Full-Speed traffic?

The TUSB213RGYT is explicitly designed to be transparent to USB Low-Speed (1.5 Mbps) and Full-Speed (12 Mbps) signaling. Its patented architecture bypasses LS/FS signals without applying any gain, offset, or timing adjustment-preserving original voltage levels, rise/fall times, and jitter characteristics. This ensures backward compatibility with legacy peripherals and avoids unintended side effects such as enumeration failure or communication errors that could arise from signal modification at non-HS rates. The TUSB213RGYT only engages its conditioning circuitry upon detection of a valid High-Speed handshake.

Can the TUSB213RGYT be configured after power-up, or is setup limited to initial reset?

The TUSB213RGYT supports both static and dynamic configuration. In pin-strapped mode, AC and DC boost settings are latched at RSTN de-assertion and remain fixed until the next reset. However, when operating in I²C mode (enabled by pulling SDA and SCL high at reset), the TUSB213RGYT allows real-time reconfiguration of ACB_LVL (register 0x01), DCB_LVL (0x0E), and operational state via its 7-bit slave address 0x2C. This means the TUSB213RGYT can adapt boost levels on-the-fly during system operation-enabling adaptive tuning, field calibration, or dynamic response to changing channel conditions without hardware reset.

What is the role of the VREG pin on the TUSB213RGYT, and how must it be used?

The VREG pin on the TUSB213RGYT outputs a regulated 1.8-V supply derived from the internal LDO, but only when the device is operating in High-Speed mode. It is not intended for external load powering-it solely supplies the TUSB213RGYT's internal digital core. A mandatory 0.1-µF ceramic capacitor must be placed between VREG and GND to stabilize this rail; omission causes functional instability or failure to enter HS mode. The VREG pin remains inactive (high-impedance) in LS/FS/Shutdown states, and no external circuitry should draw current from it.

Does the TUSB213RGYT support daisy-chaining, and if so, what are the practical limits?

Yes, the TUSB213RGYT supports daisy-chaining to extend compensation capability in extremely lossy channels. TI documents this as a scalable solution for high-loss applications-such as backplanes or ultra-long active cables-where a single unit cannot fully restore the eye diagram. While no absolute maximum cascade count is specified, each additional TUSB213RGYT introduces ~100 ps of added propagation delay and incremental insertion loss. Practical deployments typically limit chaining to 2–3 units, with careful attention to timing budget, power delivery, and thermal dissipation. The TUSB213RGYT's D1/D2 port symmetry and agnostic design simplify cascaded topologies without requiring directional orientation.