Infineon Technologies CY7C65631-56LTXIT

Overview

CY7C65631-56LTXIT from Infineon Technologies (formerly Cypress) is a 4-port USB 2.0 hub controller with single transaction translator, 56-pin QFN package, –40 °C to +85 °C industrial temperature grade, and integrated USB transceivers, pull-up/down/termination resistors. It enables low-power, cost-optimized USB hub designs in docking stations, monitor hubs, and external storage enclosures.

For engineers reviewing the CY7C65631-56LTXIT datasheet, CY7C65631-56LTXIT pinout, CY7C65631-56LTXIT application, or CY7C65631-56LTXIT equivalent, key selection criteria include single-TT architecture for shared bandwidth across four downstream ports, SPI-configurable VID/PID/port power settings, integrated 24 MHz PLL clock generation, and support for both bus-powered and self-powered modes.

Technical Context

The CY7C65631 implements a USB 2.0-compliant hub control block with Serial Interface Engine (SIE), Hub Repeater logic, and a single Transaction Translator (TT) for speed translation between high-speed upstream and full/low-speed downstream devices. It handles bit stuffing/unstuffing, checksum validation, token identification, and address checking autonomously.

Routing logic dynamically assigns downstream ports to either the TT (for full/low-speed devices on high-speed hub) or Hub Repeater (for high-speed devices), while internal port power control, overcurrent detection filtering (configurable 0–15 ms), and LED indicator management are all managed via SPI EEPROM configuration.

Key Specifications

Pinout & Package

Package: 56-pin QFN (7 mm × 7 mm, 0.4 mm pitch), exposed thermal pad, RoHS-compliant, moisture sensitivity level 3.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB 2.0 hub controller applications.

Compared with CY7C65640-56LTXI, the CY7C65631-56LTXIT offers identical footprint and configuration but lower ESD rating; compared with UPD720114GA, it trades per-port TT flexibility for lower power, smaller BOM, and simpler clocking-making it optimal for cost-sensitive, thermally constrained, or battery-assisted hub applications.

Availability

CY7C65631-56LTXIT is available at Aetrix Electronics and suitable for docking stations, monitor-integrated hubs, and external storage enclosures requiring stable component supply, industrial temperature operation, and long-term lifecycle support.

Supply support for CY7C65631-56LTXIT 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 is a global semiconductor leader headquartered in Munich, Germany, delivering power systems, microcontrollers, sensors, and connectivity solutions for industrial, automotive, and IoT applications.

The CY7C65631 belongs to Infineon's EZ-USB HX2LP Lite™ family, designed specifically for ultra-low-power, cost-optimized USB 2.0 hub implementations where integration of passive components and SPI-based configurability reduce time-to-market and bill-of-materials cost.

FAQ

Does CY7C65631-56LTXIT require an external crystal?

Yes, it requires a 24 MHz fundamental-mode crystal connected to XTAL_IN/XTAL_OUT pins. The device integrates a PLL that locks to this crystal to generate internal clocks; no external clock generator or oscillator is needed. Crystal load capacitance must be 12 pF per the datasheet.

Can CY7C65631-56LTXIT operate without an external SPI EEPROM?

No. On power-up, the device reads configuration (VID/PID, port count, power settings) exclusively from an external SPI EEPROM. If EEPROM is absent or unreadable, the device remains unconfigured and non-functional. Default descriptors are not factory-programmed.

What is the maximum current drive capability of the PWR#[n]# pins?

The PWR#[n]# pins are open-drain outputs rated for 8 mA sink current at VDDIO = 3.3 V. They are intended to drive the enable input of external load switches (e.g., TPS2051B, AP2112), not directly power USB devices. External switch selection must match downstream port current requirements (up to 500 mA per port).

Is CY7C65631-56LTXIT compatible with USB 3.x hosts or devices?

No. It is strictly a USB 2.0 hub controller and operates only at low/full/high speed (1.5/12/480 Mbps). It cannot negotiate or forward USB 3.x SuperSpeed (5 Gbps) traffic. When connected to a USB 3.x port, it functions as a USB 2.0 hub on the backward-compatible SS lane.