USB4640/USB4640i
High Speed Inter-Chip (HSIC)
USB 2.0 Hub and Flash Media
Controller
PRODUCT FEATURES
General Description
The SMSC USB4640/USB4640i is a Hi-Speed HSIC USB hub
and card reader combo solution with an upstream port
compliant to HSIC 1.0, a supplement to the USB 2.0
specification. The two downstream ports are compliant with the
USB 2.0 specification.
High Speed Inter-Chip (HSIC) is a digital interconnect bus that
enables the use of USB technology as a low-power chip-to-chip
interconnect at speeds up to 480 Mb/s. The HSIC interface is
an industry standard 2-pin digital interface which uses standard
USB software. The SMSC USB4640/USB4640i provides an
ultra fast interface between an HSIC enabled host and today’s
popular flash media formats. The controller allows read/write
capability to flash media from the following families:
–
–
–
–
Secure Digital
TM
(SD)
MultiMediaCard
TM
(MMC)
Memory Stick
®
(MS)
xD Picture Card
TM
(xD)
1
Features
Compliance with the following flash media card
specifications SD 2.0 / MMC 4.2 / MS 1.43 / MS-Pro 1.02 /
MS-Pro-HG 1.01 / MS-Duo 1.10 / xD 1.2
Low-power digital HSIC interface offers a replacement for
onboard host and device connection for analog USB bus
cable
HSIC interface enables printers, mobile PCs, ultra-mobile
PCs, and cell phone products to reduce the total power
budget while taking full advantage of USB connectivity and
compatibility with existing USB drivers and software
External 1.2 V reference allows upstream and downstream
HSIC links to use the same voltage reference
Supports a single external 3.3 V supply source; internal
regulators provide 1.8 V internal core voltage for additional
bill of materials and power savings
The transaction translator (TT) in the hub supports operation
of Full-Speed and Low-Speed peripherals
9 K RAM | 64 K on-chip ROM
Enhanced EMI rejection and ESD protection performance
Hub and flash media reader/writer configuration from a
single source: External I
2
C
®
ROM or external SPI ROM
— Configures internal code using an external I
2
C EEPROM
— Supports external code using an SPI Flash EEPROM
— Customizable vendor ID, product ID, and language ID if using
an external EEPROM
Datasheet
The USB4640/USB4640i offers a versatile, cost-effective, and
energy-efficient hub controller with 2 downstream USB 2.0
ports. This combo solution leverages SMSC’s innovative
technology that delivers industry-leading data throughput in
mixed-speed USB environments. Average sustained transfer
rates exceeding 35 MB/s are possible
2
.
Highlights
Upstream HSIC port and 2 exposed Hi-Speed USB 2.0
downstream ports for external peripheral expansion
The dedicated flash media reader is internally attached to a
3rd downstream port of the hub as a USB Compound
Device
— a single or multiplexed flash media reader interface
PortMap
— Flexible port mapping and port disable sequencing supports
multiple platform designs
Up to 9 configurable GPIOs for special functions
The USB4640 supports the commercial temperature range
of 0°C to +70°C
The USB4640i supports the industrial temperature range of
-40°C to +85°C
48-pin QFN lead-free, RoHS compliant package (7x7 mm)
Applications
3G/4G handsets, smartphones, cell phones, and other
mobile devices
Desktop and mobile PCs
Printers
GPS navigation systems
Media players/viewers
Consumer A/V
Set-top boxes
Industrial products
Revision 1.0 (06-09-09)
PortSwap
— Programmable USB differential-pair pin locations eases PCB
design by aligning USB signal traces directly to connectors
PHYBoost
— Programmable USB transceiver drive strength recovers signal
integrity
1.For xD-Picture Card
TM
support, please obtain a user license
from the xD-Picture Card License Office.
2.Host and media dependent.
SMSC USB4640/USB4640i
DATASHEET
SMSC [ SMSC CORPORATION ]
