CH334

Part: CH334, CH335 — WCH

Type: 4-port USB HUB controller

Description: 4-port USB 2.0 HUB controller supporting high-speed 480Mbps, full-speed 12Mbps, and low-speed 1.5Mbps, with high-performance MTT mode for full-bandwidth concurrent transmission.

Operating Conditions:

• Supply voltage: 3.3V (internal operating power)
• Operating temperature: -40 to 85 °C
• USB speeds: Upstream 480Mbps, Downstream 480Mbps

Key Specs:

• USB Protocol: USB2.0, backward compatible with USB1.1
• Upstream Port Speed: 480Mbps (high-speed), 12Mbps (full-speed), 1.5Mbps (low-speed)
• Downstream Port Speed: 480Mbps (high-speed)
• Number of Downstream Ports: 4
• Multi-Transaction Translator (TT) Modes: High-performance MTT (4 TTs) and cost-effective STT (single TT)
• ESD Performance (USB pins): 6KV, Class 3A
• Clock Source: Built-in high-precision clock, supports optional external 12MHz crystal
• Power Modes: Self-powered or bus-powered

Features:

• Supports independent or GANG power control for each port
• Supports independent or GANG overcurrent detection for each port
• Port status LED indicators
• Configurable via external EEPROM or built-in information memory
• Self-developed dedicated USB PHY, LPM low-power technology
• Built-in LDO linear step-down regulator for 3.3V operating power from USB bus
• CH335 supports MCU control to swap upstream port with 1# downstream port

Applications:

• Computer and industrial PC motherboards
• Peripherals
• Embedded systems

Package:

• QSOP16
• QSOP28
• SSOP28
• QFN16C_2x2
• QFN16_3x3
• QFN24_4x4
• QFN28_4x4
• QFN28_5x5
• QFN36_6x6
• LQFP48

• 4-port USB hub, providing 4 USB2.0 downstream ports, backward compatible with USB1.1 protocol specification
• Supports independent power control for each port or GANG overall linked power control
• Supports independent overcurrent detection for each port or GANG overall overcurrent detection, supports 5V tolerant overcurrent signal input
• Supports high-performance MTT mode, providing an independent TT for each port to achieve full-bandwidth concurrent transmission, with a total bandwidth 4 times that of STT
• Supports port status LED indicators
• Can be configured via external EEPROM to support composite devices, non-removable devices, custom VID, PID, and port configuration
• Built-in information memory, allowing batch customization of manufacturer or product information and configuration for special industry needs, without the need for EEPROM
• Self-developed dedicated USB PHY, LPM low-power technology, significantly reduced compared to the first-generation HUB chips, supports self-powered or bus-powered
• Can be configured for self-powered or bus-powered mode via I/O pins or external EEPROM
• Provides a crystal oscillator with built-in capacitors, supports external 12MHz input, and has a built-in PLL to provide a 480MHz clock for the USB PHY
• Built-in professional high-precision clock, allowing the option to remove the external 12MHz crystal, saving cost, reducing size, and lowering EMI
• Upstream port has a built-in 1.5K Ω pull-up resistor, and downstream ports have built-in pull-down resistors required by USB Host, simplifying peripherals
• Built-in LDO linear step-down regulator, which can convert the USB bus power voltage to the chip's 3.3V operating power
• CH335 supports MCU control to swap the upstream port with the 1# downstream port
• USB pins have 6KV enhanced ESD performance, Class 3A
• Industrial operating temperature range: -40 ~ 85 °C
• Available in various package forms such as QFN28, QFN24, QFN16, QSOP28

Table 1-3 Pin Definition

Note: Dimensions are in mm (millimeters).

The pin center-to-center spacing is a nominal value with no error, and other dimension errors are not greater than ±0.2mm.