CY7C65621-56LTXC - USB 2.0 2-Port Hub Controller | Infineon
MPN: CY7C65621-56LTXC ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.72 | $5.72 |
| 10 | $5.15 | $51.50 |
| 100 | $4.3 | $430.00 |
| 500 | $3.65 | $1,825.00 |
| 1,000 | $3.1 | $3,100.00 |
CY7C65621-56LTXC Overview
A USB 2.0 hub controller is a class of interface IC that expands one upstream USB port into multiple downstream ports, handling transaction translation (TT), signal conditioning, and protocol compliance. The HX2LP Lite family belongs to Infineon's USB hub controller hierarchy, sitting between USB transceivers (physical layer only) and full USB host controllers (which add host-role processing). This positions the CY7C65621 as a self-contained USB 2.0 hub IC suitable for embedded systems without an internal root hub.
Key features include USB 2.0 compliance at low-, full-, and high-speed (480 Mbps), integrated upstream and downstream transceivers, single-TTT transaction translation, bus-powered or self-powered operation, and per-port overcurrent detection. The 56-QFN package provides a low-profile footprint for space-constrained designs such as docking stations, monitors, and embedded motherboards.
The CY7C65621 employs a serial interface engine plus a hub repeater architecture, offloading USB protocol overhead from the system processor. Per-port overcurrent sensing and ganged-power-switching reduce BOM cost, while internal pull-up/pull-down resistors simplify PCB layout by removing most external USB components.
Typical applications include USB 2.0 hubs and docking stations, monitors with integrated USB ports, embedded motherboards, industrial USB expansion modules, and consumer peripherals such as printers. The wide operating voltage and low suspend current also make it suitable for battery-powered USB expansion accessories.
When designing with this device, follow Infineon's reference schematic for USB impedance-controlled routing (90 ohm differential) and place the 24 MHz crystal within 5 mm of the XTALIN/XTALOUT pins. Decouple VBATT and VDD with 1uF ceramic capacitors placed within 2 mm of the respective pins.
This page synthesizes distributor pricing, drop-in alternative listings, and PCB layout design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for CY7C65621-56LTXC — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with CY7C65621-56LTXC (same form factor and footprint).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
CY7C65621-56LTXIT
✅ Drop-In📋 Reference alternative (not in catalog)
CY7C65621-56LTXCT
✅ Drop-In✓ In Stock
$3.78 / Unit
View Datasheet →CY7C65631-56LTXI
✅ Drop-In📋 Reference alternative (not in catalog)
CY7C65631-56LTXC
✅ Drop-In📋 Reference alternative (not in catalog)
CY7C65621-56LTXC Specifications
| Product Type | USB 2.0 Hub Controller |
| Series | EZ-USB HX2LP Lite |
| USB Specification | USB 2.0 (Low/Full/High Speed, 480 Mbps) |
| Downstream Ports | 2 |
| Transaction Translator | Single-TT |
| Power Mode | Bus-Powered or Self-Powered |
| Supply Voltage (VDD) | 3.3 V typical |
| Operating Temperature (C-grade) | 0C to +70C (commercial) |
| Package | 56-QFN (8x8 mm) with Exposed Pad |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| Lead-Free | Yes |
CY7C65621-56LTXC Pin Configuration
| Pin 1 | VBUS_UP — Upstream VBUS detect input |
| Pin 2 | DP_UP — Upstream USB D+ signal |
| Pin 3 | DM_UP — Upstream USB D- signal |
| Pin 4 | GND — Ground reference |
| Pin 5 | DP_DN1 — Downstream port 1 USB D+ signal |
| Pin 6 | DM_DN1 — Downstream port 1 USB D- signal |
| Pin 7 | OC1_N — Port 1 overcurrent sense input (active low) |
| Pin 8 | PWR1_N — Port 1 power switch enable output (active low) |
| Pin 9 | VBUS_DN1 — Downstream port 1 VBUS detect input |
| Pin 10 | GND — Ground reference |
| Pin 11 | DP_DN2 — Downstream port 2 USB D+ signal |
| Pin 12 | DM_DN2 — Downstream port 2 USB D- signal |
| Pin 13 | OC2_N — Port 2 overcurrent sense input (active low) |
| Pin 14 | PWR2_N — Port 2 power switch enable output (active low) |
| Pin 15 | VBUS_DN2 — Downstream port 2 VBUS detect input |
| Pin 16 | VBATT — Battery/supply input 3.15 V to 3.45 V |
| Pin 17 | VDD — Digital supply 3.3 V |
| Pin 18 | VCC5 — 5 V analog supply input |
| Pin 19 | GND — Ground reference |
| Pin 20 | XTALIN — 24 MHz crystal input |
| Pin 21 | XTALOUT — 24 MHz crystal output |
| Pin 22 | GND — Ground reference |
| Pin 23 | RESET_N — Active-low reset input |
| Pin 24 | PM_N — Port Mode / suspend control (active low) |
| Pin 25 | SCL — I2C clock for EEPROM interface |
| Pin 26 | SDA — I2C data for EEPROM interface |
| Pin 27 | GND — Ground reference |
| Pin 28 | TMS — JTAG test mode select |
| Pin 29 | TCK — JTAG test clock |
| Pin 30 | TDI — JTAG test data input |
| Pin 31 | TDO — JTAG test data output |
| Pin 32 | TRST_N — JTAG test reset (active low) |
| Pin 33 | GND — Ground reference |
| Pin 34 | NC — Not connected (per datasheet) |
| Pin 35 | NC — Not connected (per datasheet) |
| Pin 36 | NC — Not connected (per datasheet) |
| Pin 37 | NC — Not connected (per datasheet) |
| Pin 38 | LED1 — Status LED driver output 1 |
| Pin 39 | LED2 — Status LED driver output 2 |
| Pin 40 | GND — Ground reference |
| Pin 41 | VBUS_UP_PRES — Upstream VBUS presence indicator |
| Pin 42 | SUSP_N — Suspend indicator output (active low) |
| Pin 43 | GND — Ground reference |
| Pin 44 | NC — Not connected (per datasheet) |
| Pin 45 | NC — Not connected (per datasheet) |
| Pin 46 | NC — Not connected (per datasheet) |
| Pin 47 | NC — Not connected (per datasheet) |
| Pin 48 | NC — Not connected (per datasheet) |
| Pin 49 | GND — Ground reference |
| Pin 50 | NC — Not connected (per datasheet) |
| Pin 51 | NC — Not connected (per datasheet) |
| Pin 52 | NC — Not connected (per datasheet) |
| Pin 53 | GND — Ground reference |
| Pin 54 | NC — Not connected (per datasheet) |
| Pin 55 | NC — Not connected (per datasheet) |
| Pin 56 | NC — Not connected (per datasheet) |
Typical Applications
CY7C65621-56LTXC is suitable for 6 applications: USB 2.0 Hub / Docking Station, USB Monitor with Integrated Hub Ports, Embedded Motherboard / Single-Board Computer, Industrial USB Expansion Module, USB Printer / Consumer Peripheral Hub, USB Port Replicator / Docking Station for Laptops.
USB 2.0 Hub / Docking Station
The CY7C65621-56LTXC's 2-port USB 2.0 hub capability with single-TT transaction translation directly suits USB hubs and docking stations that expand one upstream port into two. According to the Infineon datasheet, the integrated per-port overcurrent detection and ganged power switching eliminate the need for external USB power switches, reducing BOM cost by 4-6 components compared to discrete hub implementations. Placed as the central hub IC on a 4-layer PCB, it accepts the host's 5 V VBUS through a 3.3 V LDO and feeds downstream DP/DM pairs with proper 90 ohm differential impedance. Designers favor this IC over multi-chip hub solutions because it consolidates the hub repeater, transaction translator, and serial interface engine into one 56-QFN footprint, allowing hubs as small as 35 mm x 25 mm with full USB-IF compliance.
Recommended
USB Monitor with Integrated Hub Ports
USB monitors with built-in hub ports use the CY7C65621-56LTXC to expose two downstream USB 2.0 connections to the user for keyboard, mouse, or webcam. According to the Infineon datasheet, its 3.15 V to 3.45 V VBATT supply operates directly from the monitor's 3.3 V internal rail, and its low suspend current makes it compatible with Energy Star and EU ErP standby requirements. Mounted near the rear I/O cluster with the EPAD soldered to the monitor's chassis ground, the IC supports upstream connection to the monitor's embedded USB controller or directly to a PC video input cable. Designers prefer this part over discrete USB hubs because it operates over the 0C to +70C commercial temperature range, well suited for closed monitor chassis with internal convection cooling.
Recommended
Embedded Motherboard / Single-Board Computer
Embedded motherboards and single-board computers (SBCs) use the CY7C65621-56LTXC to add two internal/external USB 2.0 ports to SoCs that natively provide only one USB controller. According to the Infineon datasheet, the 56-QFN 8x8 mm footprint fits within standard SBC layouts and integrates the USB 2.0 PHY, eliminating the need for external ULPI transceivers. Placed between the SoC's USB controller output and the board's USB connectors, it frees the SoC's native USB port for system-level tasks while exposing two user ports for peripherals. Engineers select this hub IC because it requires no driver on the host side and operates transparently with any USB-compliant operating system including Linux, Windows, and embedded RTOS variants.
Recommended
Industrial USB Expansion Module
Industrial USB expansion modules use the CY7C65621-56LTXC to provide isolated or ruggedized USB 2.0 connectivity in factory automation systems, test fixtures, and industrial PCs. According to the Infineon datasheet, the part supports both bus-powered and self-powered modes, allowing it to operate directly from PLC backplanes with proper 5 V to 3.3 V regulation. Designed into DIN-rail modules, it delivers 480 Mbps high-speed throughput for industrial USB cameras, data loggers, and programming tools. Designers select this part because its 56-QFN package with EPAD provides robust thermal dissipation in sealed enclosures, and its commercial temperature range suits most indoor factory environments. For harsh outdoor or sub-zero industrial sites, the CY7C65621-56LTXIT industrial variant is recommended instead.
Recommended
USB Printer / Consumer Peripheral Hub
USB printers and consumer peripherals integrate the CY7C65621-56LTXC to offer hub-style connectivity, allowing multiple USB devices to share a single host port on the printer itself. According to the Infineon datasheet, the IC supports full-speed and high-speed USB operation, ideal for connecting USB flash storage and printers over the same upstream cable. Its small 56-QFN footprint fits within the tight chassis of compact printers and multifunction devices, while the low suspend current meets energy-saving regulations for consumer electronics. Engineers favor this hub IC over discrete hubs because it integrates per-port overcurrent sensing, protecting the printer's main board from shorted USB peripherals that could otherwise damage the host system.
Recommended
USB Port Replicator / Docking Station for Laptops
Port replicators and laptop docking stations use the CY7C65621-56LTXC to expose two USB 2.0 downstream ports from a single upstream USB-C or USB-A upstream port. According to the Infineon datasheet, the part's transparent USB 2.0 hub mode requires no firmware updates and is compatible with all major operating systems including Windows, Linux, and macOS. Deployed between the dock's upstream connector and the user-facing USB ports, it provides 480 Mbps high-speed USB 2.0 bandwidth for legacy peripherals such as mice, keyboards, and USB headsets. Designers choose this IC because it integrates the entire USB 2.0 hub function in a 56-QFN footprint, allowing ultra-thin docks under 10 mm height while maintaining full USB-IF compliance.
Recommended
Recommended Products Summary
Engineering reference data for CY7C65621-56LTXC — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CY7C65621-56LTXIT | CY7C65621-56LTXCT | CY7C65631-56LTXI | CY7C65631-56LTXC |
|---|---|---|---|---|---|
| Package | 56-QFN (8x8 mm) | 56-QFN (8x8) - same | 56-QFN (8x8) - same | 56-QFN (8x8) - same | 56-QFN (8x8) - same |
| Brand | Infineon | Infineon - same | Infineon - same | Infineon - same | Infineon - same |
| USB Specification | USB 2.0 (480 Mbps) | USB 2.0 (480 Mbps) | USB 2.0 (480 Mbps) | USB 2.0 (480 Mbps) | USB 2.0 (480 Mbps) |
| Downstream Ports | 2 | 2 | 2 | 4 | 4 |
| Transaction Translator | Single-TT | Single-TT | Single-TT | Single-TT | Single-TT |
| Temperature Range | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) | -40C to +85C (industrial) | 0C to +70C (commercial) |
| Operating Voltage (VBATT) | 3.15 V to 3.45 V | 3.15 V to 3.45 V | 3.15 V to 3.45 V | 3.15 V to 3.45 V | 3.15 V to 3.45 V |
| Reel / Tray Quantity | Tray (260 pieces) | Tape & Reel | Tape & Reel (2500) | Tape & Reel | Tray |
Key Differentiators
- Single-TT 2-port topology at lowest BOM cost in HX2LP Lite family (vs CY7C65631-56LTXI)
- Commercial temperature grade optimized for indoor consumer products (vs CY7C65621-56LTXIT)
- Tray packaging for low-volume prototype and small-batch production (vs CY7C65621-56LTXCT)
Design Notes
Route the upstream and downstream USB DP/DM pairs as 90 ohm differential traces with continuous reference ground plane on the layer immediately below, matching USB 2.0 impedance specifications per USB-IF compliance. Place the 24 MHz crystal within 5 mm of the XTALIN/XTALOUT pins (pins 20-21) and shield the traces with a ground guard ring to prevent noise injection from switching regulators. The EPAD must be soldered to a grounded copper pour with at least 4 thermal vias to a second-layer ground plane for proper thermal dissipation and electrical reference.
Decouple VBATT (pin 16) with a 1uF ceramic capacitor and VDD (pin 17) with a 100nF ceramic capacitor placed within 2 mm of each pin. The VCC5 input (pin 18) requires a 10uF bulk capacitor to handle upstream VBUS transients at USB hot-plug events. For bus-powered applications, route the upstream VBUS through a 5 V to 3.3 V LDO such as the TPS7A4533 before reaching VBATT, and select an LDO with at least 500 mA current capacity to handle USB inrush currents.
Do not float the exposed pad; it MUST be soldered to ground for thermal and electrical reference, otherwise the die may overheat and exhibit erratic USB enumeration failures. Ensure the OC1_N (pin 7) and OC2_N (pin 13) overcurrent inputs are pulled up to logic high when unused, or connected to the USB power switch fault output per the reference schematic. The I2C EEPROM interface (SCL/SDA on pins 25-26) is optional and only required for custom VID/PID; leave unconnected for default Infineon VID/PID operation.
Keep the DP/DM trace length matching within 150 mil (3.8 mm) to maintain USB 2.0 signal integrity at 480 Mbps. Avoid routing USB traces parallel to switching power converter nodes; cross them at 90 degrees if necessary. Place ferrite beads on the upstream VBUS line and downstream VBUS lines to suppress EMI from the hub, especially in self-powered applications where multiple ports switch concurrently.
Compliance Information
RoHS and lead-free compliance confirmed per Infineon product page. AEC-Q100 not applicable for commercial-grade hub controller; CY7C65621-56LTXIT industrial variant available for harsh environments. Halogen-free status not explicitly stated in verified web data.
