CYUSB3328-88LTXI - HX3 USB 3.0 8-Port Hub Controller | Infineon
MPN: CYUSB3328-88LTXI ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $8.42 | $8.42 |
| 10 | $7.55 | $75.50 |
| 100 | $6.78 | $678.00 |
| 500 | $6.12 | $3,060.00 |
| 1,000 | $5.49 | $5,490.00 |
CYUSB3328-88LTXI Overview
What is a USB hub controller? A USB hub controller is a system-on-chip that aggregates multiple downstream USB ports into a single upstream connection, expanding the connectivity of a host computer or embedded system. Within the broader taxonomy, it falls under Interface ICs -> USB Controllers -> USB Hub Controllers, occupying the link layer between the USB host controller (typically integrated into a PC chipset) and downstream peripheral devices. HX3 specifically targets SuperSpeed (5 Gbps) industrial, docking-station, and embedded applications where firmware upgradability and signed-firmware authentication are required.
Key features of the CYUSB3328-88LTXI include: 5 Gbps USB 3.0 SuperSpeed on every port, native support for USB-C billboard and bridge modes, integrated 100-mA charging per port, firmware field-upgradeable over USB with cryptographic signing through the DMC, and a 3.0V to 3.6V single-supply operation. The 88-VFQFN exposed pad offers a thermal resistance suitable for fanless industrial enclosures, while industrial temperature grade (-40C to +85C) allows deployment in factory automation and outdoor signage.
Technically, the HX3 architecture pairs an ARM Cortex-M0 control processor with four dedicated USB 3.0 physical layers and a shared USB 2.0 high-speed hub block. The DMC co-processor manages USB Power Delivery negotiation, USB-C orientation detection, and Billboard device emulation for Alternate Mode failures, removing the need for an external PD controller. Signed firmware downloads via DMC prevent unauthorized firmware injection - a critical security feature for IT-provisioned enterprise docks.
Typical applications include USB-C docking stations for laptops, multi-monitor KVMs, industrial panel PCs with multiple USB peripherals, USB-C chargers with embedded hub functionality, and embedded test equipment that must aggregate four USB 3.0 cameras or storage devices. The CYUSB3328-88LTXI fits these scenarios because of its integrated DMC, which reduces BOM cost versus discrete PD + hub designs.
Designers should allocate a 4-layer PCB stack-up with continuous ground beneath the exposed pad for thermal dissipation, follow USB-IF compliance routing rules (90-ohm differential impedance for SuperSpeed pairs), and reserve a USB-I2C/SPI EEPROM footprint for firmware storage. The DMC handles USB-C orientation internally, so external USB-C multiplexer ICs are typically not required.
This page synthesizes distributor pricing, drop-in same-package alternatives, and design notes not found in the manufacturer datasheet alone - including cross-reference entries from Infineon part-number variants (LTXC, LTXIT) that share the 88-VFQFN footprint.
Drop-in alternatives for CYUSB3328-88LTXI — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with CYUSB3328-88LTXI (same form factor and footprint) — differing in Downstream Ports, Package, Supply Voltage, Upstream Ports.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
CYUSB3328-88LTXIT
✅ Drop-In📋 Reference alternative (not in catalog)
CYUSB3328-88LTXC
✅ Drop-In✓ In Stock
$5.21 / Unit
View Datasheet →CYUSB3328-88LTXI Specifications
| Product Type | USB 3.0 Hub Controller |
| Series | EZ-USB HX3 |
| Core | ARM Cortex-M0 |
| ROM Size | 32 KB |
| USB Speed | 5 Gbps (USB 3.0 SuperSpeed) |
| Upstream Ports | 1 x USB 3.1 Gen 2 |
| Downstream Ports | 4 downstream (8 logical via DMC) |
| Supply Voltage | 3.0 V to 3.6 V |
| Charging Support | USB PD 3.0, BC v1.2, Apple Charging |
| Billboard Device | Integrated |
| USB-C Bridge | Integrated |
| Firmware Upgrade | Over USB, signed via DMC |
| Operating Temperature | -40 C to +85 C (Industrial) |
| Package | 88-VFQFN Exposed Pad (10 x 10 mm) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
CYUSB3328-88LTXI 88-vfqfn exposed pad (10 x 10 mm) Pin Configuration Guide
Pin configuration for CYUSB3328-88LTXI (88-vfqfn exposed pad (10 x 10 mm) package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for CYUSB3328-88LTXI.
Refer to the datasheet for full pin configuration.
Typical Applications
CYUSB3328-88LTXI is suitable for 6 applications: USB-C Docking Station, Multi-Monitor KVM Switch, Industrial Panel PC with USB Peripherals, USB-C Charger with Embedded Hub, Embedded Test and Measurement Equipment, USB 3.0 Camera Aggregation Hub.
USB-C Docking Station
The CYUSB3328-88LTXI is the central hub IC in USB-C docking stations for laptops and enterprise notebooks. Its 5 Gbps SuperSpeed upstream port connects to the host USB-C connector, while the integrated Dock Management Controller (DMC) negotiates USB Power Delivery 3.0 contracts and Alternate-Mode orientation - eliminating the need for an external CYPD3135-40LQXI PD controller. The four downstream SuperSpeed ports drive external SSDs, dual-monitor DisplayPort adapters, and Gigabit Ethernet dongles simultaneously. According to the Infineon HX3 datasheet, the DMC also emulates a USB Billboard device when Alternate Mode fails, so users see an explanatory message instead of a silent failure. Industrial temperature grade enables fanless dock designs.
Recommended
Multi-Monitor KVM Switch
Multi-monitor KVM switches use the CYUSB3328-88LTXI to aggregate keyboard, mouse, and USB 3.0 peripherals between two host computers. The 5 Gbps SuperSpeed bandwidth per downstream port is sufficient for high-polling-rate mice, mechanical keyboards, and USB 3.0 audio interfaces without latency degradation. The DMC's signed-firmware download via USB prevents unauthorized firmware injection - a critical security feature for IT-managed KVMs deployed in financial trading floors. According to Infineon HX3 application notes, designers should allocate 4-layer PCB routing with 90-ohm differential impedance for all four SuperSpeed pairs and a continuous ground plane beneath the 88-VFQFN exposed pad.
Recommended
Industrial Panel PC with USB Peripherals
Industrial panel PCs - HMIs, factory automation terminals, and medical cart computers - use the CYUSB3328-88LTXI to connect barcode scanners, RFID readers, USB cameras, and printers to a single internal USB 3.0 upstream port. The industrial temperature grade (-40C to +85C) is essential for factory-floor environments with wide thermal swings. The 88-VFQFN exposed-pad package provides the thermal headroom required for fanless sealed enclosures. According to Infineon HX3 reference designs, designers should add a 4.7uF bulk capacitor on the 3.3V rail and a ferrite bead on VBUS to meet USB-IF inrush-current requirements during hot-plug events.
Recommended
USB-C Charger with Embedded Hub
USB-C chargers with embedded hub functionality - such as 100W travel chargers that also provide USB-A ports - use the CYUSB3328-88LTXI to share one upstream USB-C connection between charging and data. The integrated USB PD 3.0 controller negotiates charging power with the host laptop, while the four downstream ports provide both charging (BC v1.2 / Apple Charging) and 5 Gbps data. According to the Infineon HX3 datasheet, the DMC manages Role Swap automatically, so the charger can become a hub when connected to a USB-C laptop or a charger when connected to a USB-C wall adapter. This dual-role capability eliminates discrete PD controller ICs.
Recommended
Embedded Test and Measurement Equipment
Bench-top test equipment - protocol analyzers, oscilloscope data loggers, and USB 3.0 camera test rigs - use the CYUSB3328-88LTXI to aggregate multiple USB 3.0 instruments into a single connection to the host analysis workstation. The 5 Gbps SuperSpeed bandwidth per port allows simultaneous streaming from four USB 3.0 cameras or data acquisition modules. The field-upgradeable firmware over USB simplifies in-lab feature additions without requiring JTAG access. According to the Infineon HX3 datasheet, the on-chip ARM Cortex-M0 with 32 KB ROM handles enumeration and port-power management autonomously, freeing the host CPU for measurement tasks.
Recommended
USB 3.0 Camera Aggregation Hub
Medical imaging carts, machine-vision inspection stations, and 360-degree camera rigs use the CYUSB3328-88LTXI to combine four USB 3.0 cameras into one upstream connection. Each SuperSpeed port delivers the full 5 Gbps bandwidth required for uncompressed 1080p60 or compressed 4K video streams without frame drops. The integrated Billboard device notifies the host when Alternate Mode is unavailable, allowing graceful fallback to USB-only mode. According to Infineon HX3 reference designs, designers should reserve a USB-I2C EEPROM footprint for firmware storage and add a USB-C receptacle rated for 10,000 mating cycles to handle repeated cable swaps in test environments.
Recommended
Recommended Products Summary
Engineering reference data for CYUSB3328-88LTXI — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CYUSB3328-88LTXIT | CYUSB3328-88LTXC | CYUSB3300-68LTXC |
|---|---|---|---|---|
| Package | 88-VFQFN Exposed Pad | 88-VFQFN Exposed Pad (same) | 88-VFQFN Exposed Pad (same) | 68-QFN (different) |
| Brand | Infineon | Infineon (same) | Infineon (same) | Infineon (same) |
| USB Speed | 5 Gbps (USB 3.0) | 5 Gbps (same) | 5 Gbps (same) | 5 Gbps (same) |
| Downstream Ports | 4 physical / 8 logical (DMC) | 4 / 8 (same) | 4 / 8 (same) | 4 / 4 (no DMC) |
| USB-C / PD Integration | Integrated (PD 3.0 + Billboard) | Integrated (same) | Integrated (same) | Not integrated |
| Temperature Grade | Industrial (-40C to +85C) | Industrial (same) | Commercial (0C to +70C) | Commercial (0C to +70C) |
| Core | ARM Cortex-M0, 32 KB ROM | ARM Cortex-M0, 32 KB ROM (same) | ARM Cortex-M0, 32 KB ROM (same) | ARM Cortex-M0, 32 KB ROM (same) |
| Supply Voltage | 3.0 V to 3.6 V | 3.0 V to 3.6 V (same) | 3.0 V to 3.6 V (same) | 3.0 V to 3.6 V (same) |
Key Differentiators
- Integrated Dock Management Controller (DMC) eliminates external USB-C/PD ICs (vs CYUSB3300-68LTXC)
- 8 logical ports via DMC vs 4 fixed ports on legacy hubs (vs CYUSB3300-68LTXC)
- Industrial temperature grade (-40C to +85C) as standard (vs CYUSB3328-88LTXC)
Design Notes
Route all four USB 3.0 SuperSpeed differential pairs with 90-ohm differential impedance on a 4-layer PCB stack-up (typical: 0.2mm dielectric between L1 and L2 ground). Keep SSTX/SSRX pair length matching within 150 mil (3.8 mm) and maintain 3W spacing from other high-speed traces. The 88-VFQFN exposed pad must be soldered to a continuous ground plane with at least 9 thermal vias (0.3mm drill, 0.5mm pitch) for proper heat dissipation at full SuperSpeed loading. Add a USB-C receptacle rated for 10,000 mating cycles if the design expects frequent cable swaps.
Provide a 3.3V LDO with at least 1.5A peak current capability to supply the CYUSB3328-88LTXI VDD33 rail and downstream VBUS loads. Add a 4.7uF X7R bulk capacitor and a 0.1uF decoupling capacitor within 5mm of each VDD33 pin. For USB-C Power Delivery, route the CC1/CC2 lines through 5.1kohm pull-down resistors to ground for Source role, or use the integrated DMC configuration via firmware. Add a ferrite bead on each VBUS pin to meet USB-IF inrush-current requirements during hot-plug events.
Estimated: At maximum operating load (four downstream ports active at 5 Gbps), the CYUSB3328-88LTXI dissipates approximately 1.2W (VDD33 = 3.3V x 360mA core current per Infineon HX3 datasheet typical). With the 88-VFQFN exposed pad soldered to a 1 square inch copper pour on a 4-layer PCB, theta_JA is approximately 28 C/W, yielding a junction temperature rise of 34C above ambient. The industrial temperature grade (-40C to +85C) provides adequate margin for fanless sealed enclosures. Avoid placing the part near heat-generating components such as buck converters or DRAM.
Do not assume the CYUSB3328-88LTXI is pin-compatible with the CYUSB3300 family - the CYUSB3328 uses an 88-VFQFN package while the CYUSB3300 uses a 68-QFN, so PCB rework would be required. Do not omit the external 4.7uF bulk capacitor on VDD33 - the HX3 internal LDO cannot supply peak SuperSpeed PHY currents without bulk capacitance. Do not use commercial-grade CYUSB3328-88LTXC in industrial designs - the operating temperature range will fail cold-start tests. Always validate USB-IF compliance with a certified test lab before mass production.
Compliance Information
RoHS compliant per Infineon product page. Not AEC-Q100 qualified - this is an industrial-grade USB hub controller, not an automotive IC. For USB hub ICs in automotive applications, contact Infineon for the AEC-Q100 qualified HX3 variant.
