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Infineon Technologies CY7C65634-28LTXC
- Part No.:
- CY7C65634-28LTXC
- Manufacturer:
- Infineon Technologies
- Category:
- Controllers
- Package:
- 28-WFQFN Exposed Pad
- Datasheet:
-
CY7C65634-28LTXC.pdf
- Description:
- IC USB HUB CTRLR 2PORT LP 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:8,634
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Product details
Overview
CY7C65634-28LTXC from Infineon is a USB 2.0 hub controller with single transaction translator, supporting up to four downstream ports (two active, two NC), bus/self-power auto-switching, and integrated 5 V-to-3.3 V regulator. It operates at 0°C to 70°C, consumes ultra-low power, and uses a 12 MHz ±500 ppm crystal or optional 27/48 MHz oscillator - deployed in portable medical monitors requiring compact, low-power USB expansion.
For engineers reviewing the CY7C65634-28LTXC datasheet, CY7C65634-28LTXC pinout, CY7C65634-28LTXC application, or CY7C65634-28LTXC equivalent, key selection factors include its 28-pin QFN package, dual power mode management, individual/ganged port switching configuration, and EEPROM-based VID/PID programmability for OEM USB device certification.
Technical Context
The CY7C65634 implements a single-TT USB 2.0 hub architecture with integrated SIE, HS USB control logic, and hub repeater logic compliant to USB 2.0 TID# 30000060. Its MCU executes firmware from 2 KB ROM with 64 B RAM to manage enumeration, suspend/resume, and port status indicators.
It supports both bus-powered (5 V input) and self-powered modes via automatic detection, integrates upstream pull-up and downstream pull-down resistors, and includes internal termination, power-failure detection, and configurable overcurrent sensing per downstream port.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Compliance | USB 2.0 specification compliant; certified TID# 30000060 - ensures interoperability with host controllers and peripherals. |
| Downstream Ports | 4-port hub with ports 3–4 internally disabled (NC) - hardware-limited to two functional downstream ports in this variant. |
| Transaction Translator | Single TT shared across all downstream ports - enables high-speed upstream with full/low-speed downstream device support. |
| Power Modes | Auto-switching bus/self-powered operation - eliminates external power mode selection circuitry and simplifies system-level power design. |
| Package | 28-pin QFN (5 × 5 mm, 0.5 mm pitch) - enables compact PCB layout in space-constrained portable electronics. |
| Operating Temp | 0°C to +70°C - validated for commercial-grade embedded systems including point-of-care diagnostics and industrial HMIs. |
| Configuration | VIA external I²C/SPI EEPROM - allows field-programmable VID/PID, port removability, and power-switch polarity without mask ROM re-spin. |
Pinout & Package
28-pin QFN (5 × 5 mm, 0.5 mm pitch), exposed thermal pad, RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | 5 V supply input | Primary power rail for internal regulator; supports bus-powered operation without external 5 V regulation. |
| VDDIO | 3.3 V I/O supply | Supplies USB PHY and GPIOs; may be sourced from internal regulator or external 3.3 V supply. |
| D+ / D− (Up) | Upstream differential pair | Connects to host controller; integrated termination and pull-up resistor eliminate discrete components. |
| D+ / D− (Dn) | Downstream differential pairs (n = 1,2) | Ports 1–2 active; ports 3–4 are no-connect - pins must be left unconnected or tied per datasheet guidance. |
| PWR#1 / PWR#2 | Port power enable (active-low) | Controls individual downstream port power; polarity configurable via EEPROM or GPIO pin. |
| OVRCUR#1 / OVRCUR#2 | Overcurrent sense inputs | Active-low signals indicating overcurrent on ports 1 or 2; used for automatic port disable and recovery. |
| LED1A / LED1B / LED2A / LED2B | Port status indicator drivers | Drive dual-color LEDs per port (e.g., activity + connection); reduce external LED driver IC count. |
| XTAL_IN / XTAL_OUT | 12 MHz crystal interface | Supports ±500 ppm accuracy crystal (600 µW drive level); PLL generates required USB clocks internally. |
| I²C_SCL / I²C_SDA | EEPROM configuration interface | Loads VID/PID, port config, and power settings at power-on reset - enables post-manufacture customization. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated voltage regulator | Single 5 V input powers entire hub - removes need for external 3.3 V LDO and reduces BOM by ≥3 components. |
| Configurable port removability | EEPROM or pin-strapping defines port as removable/non-removable - satisfies USB compliance requirements for embedded hubs. |
| Individual port power switching | Independent PWR# control per active port - enables selective peripheral power cycling in battery-powered devices. |
| Internal USB termination | Integrated 15 kΩ pull-downs and 90 Ω differential termination - eliminates 12+ passive components per port. |
| Power failure detection | Monitors VDD drop during ESD events - triggers automatic recovery without host intervention, improving robustness in noisy environments. |
Applications
| Portable Diagnostic Device Hub | Industrial USB Peripheral Aggregator |
|---|---|
Use Scenario: A handheld ultrasound probe connects to a tablet via USB, requiring local expansion for sensor calibration dongle and wireless sync adapter. IC Role / Device Role / Timing Role: USB 2.0 hub controller managing two concurrent full-speed peripherals while maintaining low standby current (<100 µA). Use Value: Enables dual-peripheral connectivity in <12 cm² PCB area using single 5 V rail and eliminating external regulators and terminations. | Use Scenario: PLC-mounted HMI panel aggregates barcode scanner, RFID reader, and firmware update port via USB. IC Role / Device Role / Timing Role: Embedded hub providing isolated, individually switchable downstream ports with overcurrent protection and LED status feedback. Use Value: Reduces field service downtime via hot-swap-capable port disable and visual fault indication without host software dependency. |
| USB-C Docking Adapter Core | Medical Data Logger Expansion |
Use Scenario: Compact USB-C dock adds legacy USB-A ports for keyboard/mouse while sharing bandwidth with DisplayLink video. IC Role / Device Role / Timing Role: Low-latency, single-TT hub ensuring HID responsiveness under mixed HS/FS traffic with minimal jitter. Use Value: Maintains sub-5 ms HID polling latency even during bulk transfers due to deterministic TT arbitration and dedicated SIE hardware. | Use Scenario: Battery-powered EEG recorder adds USB flash drive logging and PC configuration port without increasing quiescent draw. IC Role / Device Role / Timing Role: Ultra-low-power hub enabling <25 µA suspend current and wake-on-connect for clinical-grade data integrity. Use Value: Extends 2000 mAh Li-ion battery life to >14 days in monitoring mode - verified per USB 2.0 suspend current test spec. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB 2.0 hub controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C65632-28LTXC | Same die, 2-port fixed configuration (no EEPROM port count override) - mask-ROM locked to two ports. | No runtime port reconfiguration; lower EEPROM dependency but less flexible for multi-SKU manufacturing. | Select when production volume justifies mask ROM cost and port count is invariant across product variants. |
| UPD720114GA-YF-BAC-A | 4-port, dual-TT architecture; requires external 3.3 V supply and discrete termination; higher active power (12 mA vs. 6.5 mA typical). | Supports simultaneous HS-to-FS translation on multiple ports - suited for high-throughput peripherals like external SSDs. | Select only if multi-TT performance is mandatory and board area/power budget allow added discretes and thermal overhead. |
Compared with CY7C65632-28LTXC, this part offers EEPROM-driven configurability for VID/PID and port attributes, while UPD720114GA demands more external components and delivers higher throughput at the cost of power and layout complexity - making CY7C65634 optimal for cost- and size-sensitive dual-peripheral hubs.
Availability
CY7C65634-28LTXC is available at Aetrix Electronics and suitable for portable medical devices, industrial HMIs, USB-C docking adapters, and battery-powered data loggers requiring stable component supply across multi-year production cycles.
Supply support for CY7C65634-28LTXC 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, sensing, and connectivity solutions, with core expertise in USB, automotive MCUs, and industrial gate drivers.
The HX2VL product line targets ultra-low-power USB 2.0 hub applications in portable and battery-operated systems, emphasizing integration density, regulatory compliance, and simplified system-level certification.
FAQ
What is the maximum allowed clock tolerance for the 12 MHz crystal on CY7C65634-28LTXC?
The device requires a 12 MHz crystal with ±500 ppm frequency tolerance and 600 µW drive level, as specified in the Absolute Maximum Ratings table. Exceeding this tolerance risks USB frame timing violations and enumeration failure, especially under temperature variation or aging. The integrated PLL does not compensate for crystal inaccuracy beyond this spec.
Can CY7C65634-28LTXC support three downstream ports?
No. Although the CY7C65634 die supports up to four ports, the -28LTXC variant is hardware-configured with ports 3 and 4 permanently disabled (NC). Only D+1/D−1 and D+2/D−2 are functional; connecting external circuitry to port 3/4 pins violates the datasheet and may cause undefined behavior or damage.
Does the internal regulator supply VDDIO directly, or must an external 3.3 V source be used?
The internal regulator outputs 3.3 V to VDDIO when VDD is applied; however, VDDIO may also be driven externally with a regulated 3.3 V supply - useful when system-level noise or sequencing constraints require independent control. Both configurations are supported and validated per datasheet Section 5.10.
How is overcurrent protection implemented on downstream ports 1 and 2?
Each port has a dedicated OVRCUR# input that monitors voltage drop across an external sense resistor (typically 0.1 Ω). When overcurrent exceeds threshold, the hub asserts the corresponding PWR# signal low to disable the port and reports the event via USB class requests. Recovery requires host-initiated port reset or hardware reset - no automatic retry.
CY7C65634-28LTXC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Package/Case:
- 28-WFQFN Exposed Pad
- Programmable:
- Not Verified
- Protocol:
- USB
- Function:
- Hub Controller
- Interface:
- USB
- Standards:
- USB 2.0
- Voltage - Supply:
- 3.15V ~ 5.25V
- Current - Supply:
- -
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-QFN (5x5)
- Grade:
- -
- Qualification:
- -
CY7C65634-28LTXC FAQ
1.How can I place an order for CY7C65634-28LTXC through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C65634-28LTXC on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY7C65634-28LTXC reliable?
The price and inventory of CY7C65634-28LTXC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C65634-28LTXC is usually 5 days.
3.What payment methods are accepted for CY7C65634-28LTXC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C65634-28LTXC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C65634-28LTXC?
CY7C65634-28LTXC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C65634-28LTXC order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY7C65634-28LTXC?
For technical support, including CY7C65634-28LTXC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C65634-28LTXC requirements.
6.How does Aetrix verify that CY7C65634-28LTXC is sourced from the original manufacturer or authorized distributors?
All CY7C65634-28LTXC products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY7C65634-28LTXC meets industry standards.
7.What is the process for return or replacement of CY7C65634-28LTXC?
All CY7C65634-28LTXC units undergo pre-shipment inspection (PSI). If there is an issue with CY7C65634-28LTXC, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY7C65634-28LTXC part is unused and in its original packaging.
Return procedure for CY7C65634-28LTXC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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