CH334L

Overview

CH334 and CH335 are USB2.0 protocol compliant 4-port USB HUB controller chips, supporting USB2.0 high-speed and full-speed for upstream ports, and USB2.0 high-speed 480Mbps, full-speed 12Mbps and low-speed 1.5Mbps for downstream ports, supporting not only low-cost STT mode (single TT schedules 4 downstream ports in time share), but also supports high performance MTT mode (4 TTs each corresponding to 1 port, concurrent processing). Industrial grade design with streamlined peripherals for use in computer and industrial control machine motherboards, peripherals, embedded systems, etc.

Features

• 4-port USB HUB controller, provides 4 downstream facing ports which comply with Universal Serial Bus Specification Revision 2.0, and backward compatible to USB Specification Revision 1.1
• Support each port independent power control or GANG overall linkage power control
• Support independent overcurrent detection of each port or overall overcurrent detection of GANG, support 5V tolerant overcurrent signal input
• Support high performance MTT mode, providing independent TT for each port to achieve full bandwidth concurrent transmission, with 4 times the total bandwidth of STT
• Support port status LED indicators
• Configurable via external EEPROM to support composite devices, non-removable devices, custom VIDs, PIDs and port configurations
• Built-in information memory, for industry-specific needs can be customized in bulk manufacturer or product information and configuration
• Self-developed dedicated USB PHY, low-power consumption technology, significantly reduced compared to the first generation of HUB chips, support self-powered or bus-powered
• Self-powered or bus-powered mode configurable via I/O pins or external EEPROM
• Provide crystal oscillator with built-in capacitor, supports external 12MHz input, and built-in PLL provides 480MHz clock for USB PHY
• Built-in 1.5KΩ pull-up resistor on the uplink port, built-in pull-down resistor on the downlink port required for USB Host, streamlined periphery
• Built-in LDO linear buck regulator converts USB bus supply voltage to 3.3V operating power for the chip
• 6KV enhanced ESD performance, Class 3A
• Industrial grade temperature range: -40～85℃
• QFN28, SOP16, QSOP28 and other small, low-cost, easy-to-process packages are available

Package