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說明

The TUSB2046B is a 3.3-V CMOS hub device that provides one upstream port and four downstream ports in compliance with the Universal Serial Bus (USB) specification as a full-speed hub. Because this device is implemented with a digital state machine instead of a microcontroller, no firmware programming is required. Fully-compliant USB transceivers are integrated into the ASIC for all upstream and downstream ports. The downstream ports support both full-speed and low-speed devices by automatically setting the slew rate according to the speed of the device attached to the ports. The configuration of the BUSPWR terminal selects either the bus-powered or the self-powered mode.

Configuring the GANGED input determines the power switching and overcurrent detection modes for the downstream ports.

特性

• Fully Compliant With the USB Specification as a Full-Speed Hub: TID #30220231
• 32-Terminal LQFPJEDEC descriptor S-PQFP-G for low profile quad flat pack (LQFP).
  Package With a 0.8-mm Terminal Pitch or QFN Package with a 0.5-mm Terminal Pitch
• 3.3-V Low Power ASIC Logic
• Integrated USB Transceivers
• State Machine Implementation Requires No Firmware Programming
• One Upstream Port and Four Downstream Ports
• All Downstream Ports Support Full-Speed and Low-Speed Operations
• Two Power Source Modes
  • Self-Powered Mode
  • Bus-Powered Mode
• Power Switching and Overcurrent Reporting Is Provided Ganged or Per Port
• Supports Suspend and Resume Operations
• Supports Programmable Vendor ID and Product ID With External Serial EEPROM
• 3-State EEPROM Interface Allows EEPROM Sharing
• Push-Pull Outputs for PWRON Eliminate the Need for External Pullup Resistors
• Noise Filtering on OVRCUR Provides Immunity to Voltage Spikes
• Package Pinout Allows 2-Layer PCB
• Low EMI Emission Achieved by a 6-MHz Crystal Input
• Migrated From Proven TUSB2040 Hub
• Lower Cost Than the TUSB2040 Hub