USB4640/USB4640i
High Speed Inter-Chip (HSIC)
USB 2.0 Hub and Flash Media
Controller
Datasheet
PRODUCT FEATURES
General Description
Features
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.
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
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:
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
– Secure DigitalTM (SD)
– MultiMediaCardTM (MMC)
– Memory Stick® (MS)
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
– xD Picture CardTM (xD)1
The transaction translator (TT) in the hub supports operation
of Full-Speed and Low-Speed peripherals
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 possible2.
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 I2C® ROM or external SPI ROM
—
—
—
Configures internal code using an external I2C EEPROM
Supports external code using an SPI Flash EEPROM
Highlights
Customizable vendor ID, product ID, and language ID if using
an external EEPROM
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
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
—
a single or multiplexed flash media reader interface
PortMap
48-pin QFN lead-free, RoHS compliant package (7x7 mm)
—
Flexible port mapping and port disable sequencing supports
multiple platform designs
Applications
PortSwap
3G/4G handsets, smartphones, cell phones, and other
mobile devices
—
Programmable USB differential-pair pin locations eases PCB
design by aligning USB signal traces directly to connectors
PHYBoost
Desktop and mobile PCs
Printers
—
Programmable USB transceiver drive strength recovers signal
integrity
GPS navigation systems
Media players/viewers
Consumer A/V
1.For xD-Picture CardTM support, please obtain a user license
from the xD-Picture Card License Office.
2.Host and media dependent.
Set-top boxes
Industrial products
DATASHEET
SMSC USB4640/USB4640i
Revision 1.0 (06-09-09)
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