Industrial Temperature USB 2.0 Flash Media Controller and Hub Combo

SMSC USB2640i/USB2641i

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Revision 2.1 (06-29-09)

PRODUCT PREVIEW

Overview

The SMSC USB2640i/USB2641i is an integrated USB 2.0 compliant, Hi-Speed hub for USB port

expansion with an attached bulk only mass storage class peripheral controller. This multi-format flash

media controller and USB Hub Combo features three downstream ports: one port is dedicated to an

internally connected ultra fast flash media reader/writer and two exposed downstream ports are

available for external peripheral expansion.

The SMSC USB2640i/USB2641i is an ultra fast, OEM-configurable, hub controller IC with three

downstream ports for embedded USB solutions. The USB2640i/USB2641i will attach to an upstream

port as a Full-Speed Hub or as a Full-/Hi-Speed Hub. The hub supports Low-Speed, Full-Speed, and

Hi-Speed (if operating as a Hi-Speed Hub) downstream devices on all of the enabled downstream

ports.

All required resistors on the USB ports are integrated into the hub. This includes all series termination

resistors on D+ and D– pins and all required pull-down and pull-up resistors on D+ and D– pins. The

over-current sense inputs for the downstream facing ports have internal pull-up resistors.

The USB2640i/USB2641i includes programmable features such as:

PortMap which provides flexible port mapping and disable sequences. The downstream ports of a

USB2640i/USB2641i hub can be reordered or disabled in any sequence to support multiple platform

designs with minimum effort. For any port that is disabled, the USB2640i/USB2641i automatically

reorders the remaining ports to match the USB host controller’s port numbering scheme.

PortSwap which adds per-port programmability to USB differential-pair pin locations. PortSwap allows

direct alignment of USB signals (D+/D-) to connectors avoiding uneven trace length or crossing of the

USB differential signals on the PCB.

PHYBoost which enables four programmable levels of USB signal drive strength in downstream port

transceivers. PHYBoost attempts to restore USB signal integrity that has been compromised by system

level variables such as poor PCB layout, long cables, etc.