Microchip USB2524-ABZJ

USB2524-ABZJ General Description

USB2524 is the industry's first USB switching hub that combines a USB Hi-Speed hub and switching functionality in a single device. Equipped with two upstream ports and four downstream ports, USB2524 enables USB device sharing and switching between two USB hosts without "cable swapping". Requiring no more than standard USB hub driver support, the USB2524 appears as a 4-port USB hub to either USB host system and supports standard USB topology.

Device Sharing and Switching

• Per-port switching provides maximum device sharing functionality
• Flexible switching modes ease system design
• Programmable auto-switch mode enables unique applications

High Throughput

• MultiTRAK architecture provides dedicated TT for every downstream port
• Maximum USB full-speed data rate at 12 Mbps per port even under full load
• Aggregate 960 Mbps maximum data rate when both Hi-Speed hosts are active

Minimum Software Overhead

• Appears as a standard USB 2.0 hub controller on either host system
• Requires no more than standard USB hub-class driver support already native in most operating systems
• Standard USB connect and disconnect behavior as device switched from one host to the other

Ease of Integration

• Small 8x8 mm 56QFN package occupies minimum PCB space
• Flexible configuration options ease embedded system design
• USB-IF certified silicon building block ensures full USB compliance

Applications

USB2524 USB MultiSwitch hub may be used in a number of applications:

• Desktop PC drive-bays
• Mobile PC dock stations and port replicators
• All-in-one and photo printers
• LCD monitors
• KVM switches
• USB device sharing peripherals
• Set-top boxes
• DVD/HDD recorders and players
• Any USB dual-role host and device systems

Features

• Compliant with USB 2.0 Specification
• Hub controller IC with two upstream ports and four downstream ports
• MultiTRAK™ technology provides one transaction translator per port
• Default configuration with pin selectable options
• Four flexible downstream port switching modes
• Flexible OEM configuration options
• 56-pin QFN RoHS Compliant Package
• Integrated 1.8V regulator
• Integrated termination and pull-up/pull-down resistors
• Internal short circuit protection of DP and DM lines
• On-chip oscillator uses low cost 24MHz crystal
• Supports individual over-current protection and power control
• 3.3V I/O with 5V tolerance
• Customize vendor ID, product ID, device ID, and product string
• Port switching modes and host ownership of downstream ports
• Select whether the hub is part of a compound device(When any downstream port is permanently hardwired to a USB peripheral device, the hub is part of a compound device)
• Programmable LEDs to support standard green/amber port status or port speed (HS/FS/LS)
• Select the presence of a permanently hardwired USB peripheral device on a port by port basis
• Configure the delay time for filtering the over-current sense inputs
• Configure the delay time for turning on downstream port power
• Configure the polarity of down stream port power control signals
• Indicate the maximum current that the 4-port hub consumes from the USB upstream port
• Indicate the maximum current required for the hub controller
• Select downstream ports as non-removable ports
• Select downstream ports as disabled ports
• Enable/disable downstream port LED indicators
• Select downstream port power control and over-current detection on a ganged or individual basis
• Select downstream port power control polarity

Specifications