Infineon Technologies CY7C65642-28LTXC

Overview

CY7C65642-28LTXC from Infineon is a USB 2.0 hub controller with four downstream ports, integrated multiple transaction translators (one per port), 2 kB ROM/64 B RAM MCU, internal 5 V-to-3.3 V regulator, and support for bus/self-powered operation in a 28-pin QFN (5 × 5 mm) package. It enables high-performance, low-power USB connectivity in space-constrained docking stations and monitor hubs.

For engineers reviewing the CY7C65642-28LTXC datasheet, CY7C65642-28LTXC pinout, CY7C65642-28LTXC application, or CY7C65642-28LTXC equivalent, key selection criteria include per-port TT architecture, configurable power switching mode, EEPROM-based VID/PID/port count, 12 MHz ±500 ppm crystal interface, and integrated termination/pull-up/pull-down resistors.

Technical Context

The CY7C65642-28LTXC implements a dedicated transaction translator (TT) per downstream port to enable concurrent high-speed-to-full-speed split transactions without bandwidth contention. Its hub repeater handles same-speed traffic (HS↔HS or FS↔FS), while TT logic manages speed translation under HS upstream + FS/LS downstream conditions.

It integrates a 2 kB ROM/64 B RAM MCU for enumeration control, port management, and EEPROM configuration parsing; supports dual power modes with automatic bus/self-power switching; and includes on-die power failure detection for ESD recovery-critical for unattended embedded USB hubs.

Key Specifications

Pinout & Package

Package: 28-pin QFN (5 × 5 mm, 0.5 mm pitch), exposed thermal pad, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with USB2514B and USB5744, CY7C65642-28LTXC uniquely combines per-port TT, single 5 V supply operation, and EEPROM-configurable port attributes-making it optimal for compact, low-BOM consumer and commercial USB hubs requiring guaranteed concurrent FS/LS throughput.

Availability

CY7C65642-28LTXC is available at Aetrix Electronics and suitable for docking stations, monitor-integrated hubs, and multi-function printers requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for CY7C65642-28LTXC 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 German semiconductor leader specializing in power management, sensor, and connectivity solutions for automotive, industrial, and consumer markets.

CY7C65642 belongs to the EZ-USB™ HX2VL product line, designed specifically for low-power, highly integrated USB 2.0 hub applications where BOM reduction, thermal efficiency, and configurability are critical.

FAQ

Does CY7C65642-28LTXC support USB Battery Charging (BC) 1.2 specification?

No. The CY7C65642-28LTXC does not implement BC 1.2 D+/D− detection logic or dedicated charging port signaling. It complies strictly with USB 2.0 hub specifications and provides standard downstream port power switching and overcurrent protection-but lacks dedicated charging handshake circuitry required for BC 1.2 or proprietary fast-charge protocols.

Can the 12 MHz crystal be replaced with a 27 MHz oscillator?

Yes. The CY7C65642-28LTXC supports both 12 MHz crystal (with internal PLL) and 27 MHz or 48 MHz single-ended CMOS oscillator inputs. When using an oscillator, the XTAL_OUT pin must be left unconnected, and the reference clock source is selected via I/O pin configuration or EEPROM bit setting-enabling flexibility in timing source selection without redesigning the crystal network.

How is port removability configured for USB compliance?

Port removability is set via EEPROM configuration bits or hardwired I/O pins at power-on reset. Each downstream port can be defined as removable (e.g., user-accessible USB-A slot) or non-removable (e.g., internal scanner interface). This determines the bDeviceRemovable field in the hub descriptor, ensuring correct OS enumeration behavior and preventing spurious device removal notifications in Windows and macOS.

What is the role of the exposed thermal pad on the 28-pin QFN package?

The exposed thermal pad on the bottom of the 28-pin QFN package must be soldered to a solid copper thermal plane on the PCB to dissipate heat during sustained high-speed USB traffic. It is electrically connected to ground (GND) internally and improves thermal resistance by up to 30% compared to non-thermal-pad QFN variants-critical for maintaining reliable operation at +70°C ambient in enclosed hub enclosures.