Infineon Technologies CY7C65100-SC

Overview

CY7C65100 from Cypress Semiconductor is a fixed-function four-port USB 1.1 hub controller integrating hub repeater, hub controller, Serial Interface Engine (SIE), and USB transceivers. It operates from 4.0–5.5 V, supports full-speed (12 Mbps) and low-speed (1.5 Mbps) downstream devices, features individual port power switching and overcurrent detection, and uses an internal 48-MHz PLL driven by an external 6-MHz crystal - enabling standalone hub designs without firmware.

For engineers reviewing the CY7C65100 datasheet, CY7C65100 pinout, CY7C65100 application, or CY7C65100 equivalent, key selection considerations include its self-contained USB 1.1 hub functionality, 28-pin SOIC package, bus- or self-powered configuration via PWR_SEL, and requirement for external power switches and 20-Ω series resistors on all USB differential lines.

Technical Context

The CY7C65100 implements a complete USB 1.1 hub function with one upstream port and four downstream ports, handling physical layer signaling, bit stuffing/unstuffing, CRC generation/checking, and ACK/NAK/STALL protocol responses in hardware via its integrated SIE. It offloads enumeration coordination, FIFO management, suspend/resume, and port power control to the embedded hub control block.

Its clock architecture relies on an external 6-MHz crystal connected between XTALIN and XTALOUT, feeding an on-chip PLL that generates the required 48-MHz USB clock. The device does not support ceramic resonators due to USB timing tolerance requirements, and requires external 20-Ω series resistors on all D+/D− lines to meet USB driver impedance specifications.

Key Specifications

Pinout & Package

Package: 28-lead Small Outline Integrated Circuit (SOIC), 300-mil body width, 1.27-mm lead pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-function USB 1.1 hub controller applications.

Compared with SMSC USB2422 and Genesys GL850G, the CY7C65100 offers lower system cost and simpler EMI design via its 6-MHz crystal and integrated transceivers, but is limited to USB 1.1 speeds and requires external power switches - making it optimal for cost-sensitive, low-speed peripheral hubs.

Availability

CY7C65100 is available at Aetrix Electronics and suitable for desktop peripheral hubs, monitor-integrated USB expansion, industrial control panels, and embedded system add-on modules requiring stable component supply and long-lifecycle availability.

Supply support for CY7C65100 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

Cypress Semiconductor (now part of Infineon Technologies) is a fabless semiconductor company specializing in programmable system-on-chip (PSoC), memory, and USB connectivity solutions for industrial, automotive, and consumer markets.

The CY7C65100 belongs to Cypress's fixed-function USB hub ASSP product line, designed specifically to accelerate time-to-market for USB 1.1 hub implementations without firmware development or USB protocol stack integration.

FAQ

Does the CY7C65100 support USB 2.0 high-speed operation?

No. The CY7C65100 is strictly compliant with USB Specification Revision 1.1 and supports only full-speed (12 Mbps) and low-speed (1.5 Mbps) signaling. It lacks the high-speed transceiver circuitry, chirp detection logic, and 480-Mbps timing architecture required for USB 2.0. Designs requiring high-speed operation must use a USB 2.0 hub IC such as the SMSC USB2422 or Genesys GL850G.

Can I use a ceramic resonator instead of a crystal with the CY7C65100?

No. The CY7C65100 datasheet explicitly states that ceramic resonators are inadequate due to insufficient frequency stability and excessive jitter, which violate USB 1.1 timing specifications. Only a fundamental-mode 6-MHz quartz crystal with appropriate load capacitance (typically 30 pF) is supported on XTALIN/XTALOUT.

What external components are mandatory for basic CY7C65100 operation?

Mandatory external components include: a 6-MHz crystal between XTALIN and XTALOUT; four 20-Ω ±5% series resistors on all USB D+/D− lines (upstream and each downstream port); an external 3.3-V supply connected to VREF; and discrete power switches (e.g., AP2101) controlled by PWR[1–4] and monitored via OC[1–4]. No bypass capacitors are listed as mandatory beyond standard VCC/GND decoupling.

How is vendor/product ID configured for custom USB enumeration?

The CY7C65100 ships with default VID 0x04B4 and PID 0x5204 (bus-powered) or 0x5203 (self-powered), selected by PWR_SEL. For custom VID/PID, Cypress offers factory programming for high-volume orders - this requires direct engagement with Cypress/Infineon sales and cannot be done in-system or via software. No user-accessible EEPROM or configuration registers exist on the device.