Infineon Technologies CYUSB3312-88LTXC

Overview

CYUSB3312-88LTXC from Infineon is a USB 3.2 Gen 1 (5 Gbps) hub controller with two downstream USB 3.0 ports, integrated ARM® Cortex®-M0 CPU (16 KB RAM, 32 KB ROM), pin-strap configuration support, and USB Battery Charging v1.2 compliance. It enables embedded applications requiring shared-link capability, ghost charging, and ACA-Dock mode for simultaneous charging and data transfer on downstream ports.

For engineers reviewing the CYUSB3312-88LTXC datasheet, CYUSB3312-88LTXC pinout, CYUSB3312-88LTXC application, or CYUSB3312-88LTXC equivalent, key selection criteria include dual SS/USB 2.0 port architecture, industrial temperature range (–40°C to +85°C), 88-pin QFN package, BC v1.2 charging implementation per port, and I2C-based firmware upgrade capability via vendor commands.

Technical Context

The device integrates two independent hub controllers: an SS hub supporting U0–U3 link power states and full-duplex 5 Gbps operation, and a USB 2.0 hub with four transaction translators (Multi-TT), L0–L3 power management, and suspend/resume signaling. The embedded Cortex-M0 executes boot initialization, battery charging control, and vendor-command processing.

Port control logic implements overcurrent detection, ganged/individual power switching, automatic port numbering, and VBUS management for both upstream and downstream paths. Configuration is supported via pin-straps (VID, PID, port count, power switch polarity), eFuse, or I2C EEPROM - enabling flexible BOM reduction without external configuration ICs.

Key Specifications

Pinout & Package

88-pin QFN (10 × 10 × 1.0 mm), exposed thermal pad, 0.5 mm pitch, RoHS-compliant. Pinout includes dedicated signals for US/DS differential pairs (SSTxP/M, SSRxP/M, D+/D−), VBUS detection, LED drivers (suspend/SS/USB2), GPIOs for overcurrent/power enable, I2C bus (SCL/SDA), reset, oscillator input (26 MHz), and configuration strapping pins (CFG[3:0]).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 3.0 hub controller applications.

Compared with CYUSB3312-88LTXC, CYUSB3314 offers higher port density but increases PCB area and power; UPD720210 provides mature USB-IF certification but omits Infineon's embedded intelligence for charging and firmware-upgradable I2C bridging - limiting adaptability in evolving embedded designs.

Availability

CYUSB3312-88LTXC is available at Aetrix Electronics and suitable for docking stations, embedded industrial controllers, smart monitors, and medical diagnostic devices requiring stable component supply across long-lifecycle production programs.

Supply support for CYUSB3312-88LTXC 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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, sensing, connectivity, and security solutions for automotive, industrial, and consumer markets.

CYUSB3312 belongs to the EZ-USB™ HX3 product line, designed specifically for embedded USB 3.0 hub applications demanding integrated charging, firmware configurability, and compact packaging - targeting space-constrained, thermally demanding, and field-upgradable systems.

FAQ

Does CYUSB3312-88LTXC support USB 3.2 Gen 2 (10 Gbps)?

No. CYUSB3312-88LTXC complies strictly with USB 3.2 Gen 1 (5 Gbps) and USB 2.0 specifications. Its SS PHY and link layer are architected for 5 Gbps signaling only, with no hardware or firmware support for 10 Gbps lanes, encoding, or protocol extensions defined in USB 3.2 Gen 2.

Can the integrated Cortex-M0 be used for custom application code?

No. The ARM® Cortex®-M0 subsystem is reserved exclusively for Infineon's proprietary firmware controlling hub functionality, charging logic, configuration parsing, and vendor-command execution. It is not user-programmable; no SDK, debug interface, or memory access is provided for third-party code deployment.

Is external USB 2.0 termination required for CYUSB3312-88LTXC?

No. The device integrates all required USB 2.0 pull-up/pull-down resistors and series termination for D+/D− lines. External termination is unnecessary unless custom port behavior (e.g., forced LS mode) is implemented via GPIO-controlled external switches - which is not standard practice.

What is the maximum allowed junction temperature for continuous operation?

The maximum junction temperature is 125°C, as specified in Absolute Maximum Ratings (Section 9). Under industrial ambient conditions (–40°C to +85°C), sustained operation at full 2-port SS load requires thermal design ensuring θ_JA ≤ 35°C/W - typically achieved using the exposed thermal pad soldered to ≥4 cm² internal copper pour with ≥4 thermal vias.