CY7C65621-56LTXCT - 4-Port USB 2.0 Hub Controller | Infineon
MPN: CY7C65621-56LTXCT ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.9 | $5.90 |
| 10 | $5.31 | $53.10 |
| 100 | $4.72 | $472.00 |
| 500 | $4.25 | $2,125.00 |
| 1,000 | $3.78 | $3,780.00 |
CY7C65621-56LTXCT Overview
A USB hub controller is a protocol-aware bridge that expands one upstream USB port into multiple downstream ports while handling the USB 2.0 hub specification, including transaction translator (TT) logic, port power switching coordination, and over-current protection signaling. The HX2LP Lite family sits in the broader product hierarchy of USB interface IC -> interface IC -> integrated circuit, and is engineered specifically for low-power embedded hubs where standby current, BOM cost, and PCB area are critical.
Key features include support for USB 2.0 high-speed (480 Mbps), full-speed (12 Mbps), and low-speed (1.5 Mbps) signaling, in-system EEPROM programming via SPI for vendor ID, product ID, and port customization, integrated upstream and downstream termination resistors that eliminate external components, and integrated LED status indicator drivers per port. The CY7C65621 variant provides four downstream ports, while the related CY7C65631 variant targets two-port designs.
From an architectural perspective, the HX2LP Lite integrates the physical layer (PHY), serial interface engine (SIE), hub repeater, transaction translator, and power-management state machine into a single die. This integration reduces external component count compared to discrete hub designs, where multiple transceivers and a separate hub controller IC are required. According to the Cypress/Infineon datasheet, the integrated PLL derives all required USB clocks from a single 24 MHz crystal, eliminating the need for an external clock generator.
Typical applications include USB port expansion on laptops, docking stations, monitors with built-in USB hubs, embedded industrial PCs, and consumer electronics such as set-top boxes and game consoles. The commercial temperature grade (0C to +70C) suits indoor commercial environments.
When designing with this device, allocate 10 uF plus 0.1 uF ceramic bypass capacitors close to the 3.3 V supply pin, route the USB 2.0 differential pairs (D+/D-) with 90 ohm differential impedance, and ensure the upstream port's VBUS sensing resistor is selected per the USB 2.0 bus-power budget. The 56-QFN package requires thermal relief on the exposed pad connected to the ground plane.
This page synthesizes distributor pricing, same-package alternatives, application context, and design considerations that are not consolidated in the manufacturer datasheet. Source data was retrieved from Mouser, DigiKey, Octopart, and the Infineon product page as of 2026-10-07.
Drop-in alternatives for CY7C65621-56LTXCT — 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 CY7C65621-56LTXCT (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)
CY7C65621-56LTXC
✅ Drop-In✓ In Stock
$3.1 / Unit
View Datasheet →CY7C65621-56LTXCKG
✅ Drop-In📋 Reference alternative (not in catalog)
CY7C65631-56LTXC
✅ Drop-In📋 Reference alternative (not in catalog)
CY7C65631-56LTXIT
✅ Drop-In📋 Reference alternative (not in catalog)
CY7C65621-56LTXCT Specifications
| Device Type | USB Hub Controller |
| Protocol | USB 2.0 |
| Number of Downstream Ports | 4 |
| Supply Voltage | 3.3 V |
| Operating Temperature | 0 C to +70 C |
| Package Type | 56-QFN (8x8 mm, 0.90 mm height, MO-220) |
| Number of Pins | 56 |
| External Crystal | 24 MHz (integrated PLL) |
| USB Speeds Supported | Low-Speed (1.5 Mbps), Full-Speed (12 Mbps), High-Speed (480 Mbps) |
| Integrated Termination Resistors | Upstream and downstream |
| Integrated LED Status Indicators | Yes (per port) |
| EEPROM Interface | SPI (in-system programmable, byte and word addressable) |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| RoHS Status | Compliant |
CY7C65621-56LTXCT Pin Configuration
| Pin 1 | VDD33 — 3.3 V supply |
| Pin 2 | GND — Ground |
| Pin 3 | USBDP_UP — Upstream USB D+ (differential pair) |
| Pin 4 | USBDN_UP — Upstream USB D- (differential pair) |
| Pin 5 | VBUS_UP — Upstream VBUS sense input |
| Pin 6 | RESETn — Active-low reset input |
| Pin 7 | XTALIN — 24 MHz crystal input |
| Pin 8 | XTALOUT — 24 MHz crystal output |
| Pin 9 | GND — Ground |
| Pin 10 | SDA — EEPROM I2C data (alternate mode) |
| Pin 11 | SCL — EEPROM I2C clock (alternate mode) |
| Pin 12 | SPI_CS — SPI chip select for EEPROM |
| Pin 13 | SPI_CLK — SPI clock for EEPROM |
| Pin 14 | SPI_MOSI — SPI master-out slave-in for EEPROM |
| Pin 15 | SPI_MISO — SPI master-in slave-out for EEPROM |
| Pin 16 | GND — Ground |
| Pin 17 | PWR_EN1 — Port 1 power enable output |
| Pin 18 | PWR_EN2 — Port 2 power enable output |
| Pin 19 | PWR_EN3 — Port 3 power enable output |
| Pin 20 | PWR_EN4 — Port 4 power enable output |
| Pin 21 | OVC1 — Port 1 over-current sense input |
| Pin 22 | OVC2 — Port 2 over-current sense input |
| Pin 23 | OVC3 — Port 3 over-current sense input |
| Pin 24 | OVC4 — Port 4 over-current sense input |
| Pin 25 | GND — Ground |
| Pin 26 | USBDP_DN1 — Downstream port 1 USB D+ |
| Pin 27 | USBDN_DN1 — Downstream port 1 USB D- |
| Pin 28 | USBDP_DN2 — Downstream port 2 USB D+ |
| Pin 29 | USBDN_DN2 — Downstream port 2 USB D- |
| Pin 30 | USBDP_DN3 — Downstream port 3 USB D+ |
| Pin 31 | USBDN_DN3 — Downstream port 3 USB D- |
| Pin 32 | USBDP_DN4 — Downstream port 4 USB D+ |
| Pin 33 | USBDN_DN4 — Downstream port 4 USB D- |
| Pin 34 | GND — Ground |
| Pin 35 | LED1 — Port 1 status LED driver |
| Pin 36 | LED2 — Port 2 status LED driver |
| Pin 37 | LED3 — Port 3 status LED driver |
| Pin 38 | LED4 — Port 4 status LED driver |
| Pin 39 | GND — Ground |
| Pin 40 | NC — Not connected (per datasheet) |
| Pin 41 | NC — Not connected (per datasheet) |
| Pin 42 | NC — Not connected (per datasheet) |
| Pin 43 | VBUS_DN1 — Port 1 VBUS sense |
| Pin 44 | VBUS_DN2 — Port 2 VBUS sense |
| Pin 45 | VBUS_DN3 — Port 3 VBUS sense |
| Pin 46 | VBUS_DN4 — Port 4 VBUS sense |
| Pin 47 | GND — Ground |
| Pin 48 | TEST — Test mode pin (tie low in production) |
| Pin 49 | NC — Not connected (per datasheet) |
| Pin 50 | NC — Not connected (per datasheet) |
| Pin 51 | NC — Not connected (per datasheet) |
| Pin 52 | NC — Not connected (per datasheet) |
| Pin 53 | NC — Not connected (per datasheet) |
| Pin 54 | NC — Not connected (per datasheet) |
| Pin 55 | NC — Not connected (per datasheet) |
| Pin 56 | EP — Exposed pad - thermal and ground, must be soldered to PCB ground plane |
Typical Applications
CY7C65621-56LTXCT is suitable for 6 applications: Laptop USB Port Expansion, Monitor with Integrated USB Hub, Docking Station, Embedded Industrial PC, Set-Top Box USB Expansion, Game Console USB Ports.
Laptop USB Port Expansion
The CY7C65621-56LTXCT expands one upstream USB 2.0 port on a laptop into four downstream ports with USB 2.0 high-speed (480 Mbps) support. The integrated upstream and downstream termination resistors reduce external component count versus discrete hub designs, which is critical for space-constrained laptop motherboards. The integrated port status LED drivers eliminate external indicator circuitry, and the SPI in-system programmable EEPROM allows OEM-specific VID/PID configuration. The 56-QFN 8x8 mm package fits standard laptop PCB routing, and the single 3.3 V supply aligns with laptop power rails without requiring an additional LDO.
Recommended
Monitor with Integrated USB Hub
The CY7C65621-56LTXCT provides 4-port USB 2.0 connectivity for USB-hub-enabled monitors where the upstream port connects to the host PC and the downstream ports serve keyboard, mouse, webcam, and USB drive peripherals. The integrated termination resistors and LED drivers reduce BOM cost in price-sensitive monitor designs. The 24 MHz crystal with internal PLL simplifies clocking, and the single 3.3 V supply aligns with the monitor's existing power tree. The commercial 0 C to +70 C temperature grade matches the thermal environment inside a monitor enclosure.
Recommended
Docking Station
The CY7C65621-56LTXCT is a natural fit for laptop docking stations that require 4 USB 2.0 ports alongside display and Ethernet outputs. Its 4-port configuration matches typical dock I/O panels, and the integrated termination and LED drivers reduce dock-side BOM cost. The SPI-programmable EEPROM allows dock OEMs to customize VID/PID for branding, and the integrated port-status indicators provide per-port visual feedback. The 56-QFN package is footprint-compatible with the 2-port CY7C65631, enabling a single dock PCB to be assembled with either IC based on I/O needs.
Recommended
Embedded Industrial PC
The CY7C65621-56LTXCT enables 4 USB 2.0 ports on embedded industrial PCs (IPCs) used for factory automation and machine vision, where the upstream port connects to the IPC and the downstream ports connect to barcode scanners, RFID readers, and HMI panels. The integrated termination resistors and LED drivers reduce BOM cost and PCB area versus discrete hub implementations. For environments exceeding the commercial 70 C limit, the industrial-grade CY7C65621-56LTXIT sibling part is recommended, sharing the same 56-QFN footprint and pinout.
Recommended
Set-Top Box USB Expansion
The CY7C65621-56LTXCT adds USB 2.0 high-speed ports to set-top boxes (STBs) for external storage, wireless dongles, and HID peripherals. The 480 Mbps high-speed mode supports external hard-drive enclosures for DVR functionality. The integrated upstream/downstream termination resistors and port-status LEDs reduce external component count, which is critical for STB cost targets. The 3.3 V single-supply operation matches STB power rails, and the 56-QFN package is compatible with standard STB PCB assembly processes.
Recommended
Game Console USB Ports
The CY7C65621-56LTXCT delivers 4-port USB 2.0 expansion for game consoles where high-speed (480 Mbps) USB is required for wired controllers, headset adapters, and external storage. The integrated termination resistors and per-port LED status indicators reduce BOM cost, and the SPI EEPROM allows console-specific VID/PID branding. The commercial temperature grade covers typical console thermal environments, and the 56-QFN footprint allows standard SMT assembly. The single 3.3 V supply aligns with console power rails.
Recommended
Recommended Products Summary
Engineering reference data for CY7C65621-56LTXCT — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | CY7C65621-56LTXIT | CY7C65621-56LTXC | CY7C65621-56LTXCKG | CY7C65631-56LTXC | CY7C65631-56LTXIT |
|---|---|---|---|---|---|---|
| Brand | Infineon | Infineon | Infineon | Infineon | Infineon | Infineon |
| Package | 56-QFN (8x8 mm) | 56-QFN (8x8 mm) - same | 56-QFN (8x8 mm) - same | 56-QFN (8x8 mm) - same | 56-QFN (8x8 mm) - same | 56-QFN (8x8 mm) - same |
| Downstream Ports | 4 | 4 | 4 | 4 | 2 | 2 |
| Operating Temperature | 0 C to +70 C | -40 C to +85 C | 0 C to +70 C | 0 C to +70 C | 0 C to +70 C | -40 C to +85 C |
| Supply Voltage | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V | 3.3 V |
| USB Speeds Supported | Low/Full/High | Low/Full/High | Low/Full/High | Low/Full/High | Low/Full/High | Low/Full/High |
| Integrated Termination Resistors | Yes (upstream + downstream) | Yes (upstream + downstream) | Yes (upstream + downstream) | Yes (upstream + downstream) | Yes (upstream + downstream) | Yes (upstream + downstream) |
| Packaging Media | Tape & Reel | Tape & Reel | Tray | Tray (grease-free) | Tray | Tape & Reel |
Key Differentiators
- Integrated upstream and downstream termination resistors (vs CY7C65631-56LTXC)
- 4-port configuration in same 56-QFN footprint (vs CY7C65631-56LTXC)
- Commercial-grade pricing for cost-sensitive designs (vs CY7C65621-56LTXIT)
Design Notes
Route the USB 2.0 differential pairs (D+/D-) with a 90 ohm differential impedance and keep trace length matching within 150 mil. Place the 24 MHz crystal within 5 mm of the XTALIN and XTALOUT pins with a ground guard ring to minimize EMI. The 56-QFN exposed pad (pin 56) must be soldered to a continuous ground plane for thermal dissipation and signal return.
Bypass the 3.3 V supply rail (pin 1) with a 10 uF bulk capacitor and a 0.1 uF ceramic capacitor placed within 5 mm of the supply pin. The CY7C65621 does not require an external 1.8 V LDO; internal LDOs derive core voltages from 3.3 V. For bus-powered applications, monitor VBUS with a current-sense resistor and feed the over-current signal back to the OVC pins (21-24).
Do not leave the SPI EEPROM interface floating; either populate the EEPROM with a valid configuration or tie the SPI_CS pin high to disable EEPROM loading. Forgetting to solder the exposed pad to ground can cause thermal runaway under heavy hub traffic. The TEST pin (pin 48) must be tied low in production to disable factory test mode.
Compliance Information
RoHS compliant per Infineon product page. Commercial temperature grade - industrial grade available as CY7C65621-56LTXIT. AEC-Q100 not applicable (USB hub IC is not automotive qualified).
