Infineon Technologies CY7C65631-56LTXI

Overview

CY7C65631-56LTXI 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 expansion in embedded docking stations and monitor hubs.

For engineers reviewing the CY7C65631-56LTXI datasheet, CY7C65631-56LTXI pinout, CY7C65631-56LTXI application, or CY7C65631-56LTXI equivalent, key selection factors include its single-TT architecture for shared bandwidth across four downstream ports, 24 MHz crystal-based PLL clocking, SPI-configurable VID/PID/port power settings, and ganged vs. per-port power switching control.

Technical Context

The CY7C65631 implements a USB 2.0 hub controller with integrated Serial Interface Engine (SIE), Hub Repeater, and single Transaction Translator (TT) logic - enabling high-speed upstream connectivity while translating split transactions to full/low-speed downstream devices. It supports both bus-powered and self-powered modes with configurable overcurrent detection timing (0–15 ms).

Its routing logic dynamically assigns downstream ports to either the TT (for full/low-speed devices on high-speed upstream) or Hub Repeater (for high-speed devices), and integrates all USB termination, pull-up (1.5 kΩ on upstream D+), and pull-down (15 kΩ on each downstream port) resistors - eliminating 12 external passives.

Key Specifications

Pinout & Package

Package: 56-pin QFN (7 mm × 7 mm, 0.5 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 CY7C65631-56LTXI offers identical hardware functionality but targets newer designs with updated firmware defaults; versus UPD720114GA, it trades dual-TT flexibility for lower BOM count, single-supply operation, and reduced thermal load in space-constrained applications.

Availability

CY7C65631-56LTXI is available at Aetrix Electronics and suitable for standalone USB hubs, monitor-integrated hubs, docking stations, and industrial port replicators requiring stable component supply, long-term lifecycle support, and industrial temperature compliance.

Supply support for CY7C65631-56LTXI 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 the EZ-USB HX2LP Lite™ family - designed specifically for cost-sensitive, low-power USB 2.0 hub applications where integration of passive components and flexible SPI-based configuration reduce design cycle time and bill-of-materials cost.

FAQ

Does CY7C65631-56LTXI require an external crystal?

Yes - it requires a 24 MHz fundamental-mode crystal connected between XTAL_IN and XTAL_OUT pins. The device integrates a PLL that derives all necessary USB clocks (48 MHz, 12 MHz, 6 MHz) from this source; no external oscillator or clock generator is needed.

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

No - it relies on external SPI EEPROM for critical configuration including VID/PID/DID, port count, power settings, and overcurrent parameters. Without EEPROM, the device fails to enumerate and remains in unconfigured state; blank EEPROM or missing connection results in non-functional USB interface.

What is the maximum current drive capability of PWR#[1–4] pins?

The PWR#[1–4] pins are open-drain, active-low outputs rated for 8 mA sink current at 0.4 V. They are intended to drive the enable input of external USB power switches (e.g., TPS2051B, AP2172) - not to directly power downstream devices or replace dedicated load switches.

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

No - it is strictly a USB 2.0 hub controller. It operates only at low speed (1.5 Mbps), full speed (12 Mbps), and high speed (480 Mbps). It does not support SuperSpeed (5 Gbps), SuperSpeed+, or USB Power Delivery protocols; upstream connection must be to a USB 2.0 host port or USB 2.0 hub.