CH335F

Part: CH334 and CH335 — WCH

Type: 4-port USB HUB controller chips

Description: The CH334 and CH335 are 4-port USB HUB controller chips compliant with the USB2.0 protocol, supporting high-speed 480Mbps, full-speed 12Mbps, and low-speed 1.5Mbps, with both high-performance MTT and cost-effective STT modes.

Operating Conditions:

• Operating temperature: -40 to 85 °C
• USB protocol: USB2.0, backward compatible with USB1.1
• Data rates: 480Mbps (high-speed), 12Mbps (full-speed), 1.5Mbps (low-speed)

Absolute Maximum Ratings:

Key Specs:

• USB Ports: 4 downstream ports, 1 upstream port
• Transaction Translator Modes: Supports MTT (Multi-Transaction Translator) and STT (Single-Transaction Translator)
• Power Control: Independent or GANG (collective) linked power control
• Overcurrent Detection: Independent or GANG overcurrent detection, supports 5V tolerant overcurrent signal input
• Clock Source: Built-in professional high-precision clock (crystal-free operation) or external 12MHz input
• Internal Regulator: Built-in LDO converts USB bus power to 3.3V operating power
• ESD Performance (USB pins): 6KV, Class 3A

Features:

• Supports port status LED indicators
• Configurable via external EEPROM or built-in information memory
• Self-developed dedicated USB PHY with LPM low-power technology
• Configurable for self-powered or bus-powered mode via I/O pins or external EEPROM
• Upstream port has built-in 1.5KΩ pull-up resistor, downstream ports have built-in pull-down resistors
• CH335 supports MCU control for swapping the upstream port with downstream port #1

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 (collective) linked power control
• Supports independent overcurrent detection for each port or GANG (collective) 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
• Configurable via external EEPROM for composite device support, non-removable device support, custom VID, PID, and port configuration
• Built-in information memory, allowing batch customization of manufacturer or product information and configuration for specific industry needs, without the need for an EEPROM
• Self-developed dedicated USB PHY, LPM (Low Power Management) low-power technology, significantly reduced power consumption compared to first-generation HUB chips, supports self-powered or bus-powered modes
• Configurable for self-powered or bus-powered mode via I/O pins or external EEPROM
• Provides crystal oscillator, built-in capacitors, supports external 12MHz input, built-in PLL provides 480MHz clock for USB PHY
• Built-in professional high-precision clock, allows removal of external 12MHz crystal, saving cost, reducing size, and lowering EMI
• Upstream port has built-in 1.5KΩ pull-up resistor, downstream ports have built-in pull-down resistors required by USB Host, simplified peripheral circuitry
• Built-in LDO linear step-down regulator, converts USB bus power voltage to the chip's 3.3V operating power
• CH335 supports MCU control for swapping the upstream port with downstream port #1
• USB pins feature 6KV enhanced ESD performance, Class 3A
• Industrial-grade temperature range: -40 ~ 85 °C
• Available in various package types such as QFN28, QFN24, QFN16, QSOP28

Table 1-3 Pin Definition