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PDF USB2503A Data sheet ( Hoja de datos )
| Número de pieza | USB2503A | |
| Descripción | Integrated USB2.0 Compatible 3-Port Hub | |
| Fabricantes | SMSC Corporation | |
| Logotipo |  |
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USB2503/
USB2503A
Integrated USB 2.0
Compatible 3-Port Hub
PRODUCT FEATURES
Integrated USB 2.0 Compatible 3-Port Hub
— 3 Transaction Translators for highest performance
— High-Speed (480Mbits/s), Full-Speed (12Mbits/s) and
Low-Speed (1.5Mbits/s) compatible
— Full power management with per port or ganged,
selectable power control
— Detects Bus-Power/Self-Power source and changes
mode automatically
Complete USB Specification 2.0 Compatibility
— Includes USB 2.0 Transceivers
VID/PID/DID, and Port Configuration for Hub via:
— Single Serial I2C EEPROM
— SMBus Slave Port
Default VID/PID/DID, allows functionality when
configuration EEPROM is absent
Hardware Strapping options allow for configuration
without an external EEPROM or SMBus Host
Datasheet
On-Board 24MHz Crystal Driver Circuit or 24 MHz
external clock driver
Internal PLL for 480MHz USB 2.0 Sampling
Internal 1.8V Linear Voltage Regulator
Integrated USB termination and Pull-up/Pull-down
resistors
Internal Short Circuit protection of USB differential
signal pins
1.8 Volt Low Power Core Operation
3.3 Volt I/O with 5V Input Tolerance
48 Pin QFN lead-free RoHS compliant package
SMSC USB2503/USB2503A
DATASHEET
Revision 2.1 (12-06-06)
1 page  
Integrated USB 2.0 Compatible 3-Port Hub
Datasheet
List of Tables
Table 4.1 3-Port Hub Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Table 4.2 SMBus or EEPROM Interface Behavior . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4.3 Miscellaneous Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Table 4.4 Power, Ground, and No Connect. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Table 4.5 Buffer Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Table 5.1 User-Defined Descriptor Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 5.2 SMBus Write Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 5.3 SMBus Read Byte Protocol . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Table 5.4 SMBus Slave Interface Register Map . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Table 5.5 Reset_N Timing for Default/Strap Option Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Table 5.6 Reset_N Timing for EEPROM Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Table 5.7 Reset_N Timing for SMBus Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Table 7.1 DC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Table 9.1 48 Pin QFN Package Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
SMSC USB2503/USB2503A
5
DATASHEET
Revision 2.1 (12-06-06)
5 Page 
Integrated USB 2.0 Compatible 3-Port Hub
Datasheet
Table 4.1 3-Port Hub Pin Descriptions (continued)
NAME
SYMBOL
Port Power
PRTPWR_POL
Polarity strapping.
Over Current
Sense
USB Transceiver
Bias
OCS[3:1]_N
RBIAS
TYPE
I/O12
IPU
I-R
FUNCTION
Port Power Polarity strapping determination for the active
signal polarity of the PRTPWR[3:1] pins.
While RESET_N is asserted, the logic state of this pin will
(though the use of internal combinatorial logic) determine
the active state of the PRTPWR[3:1] pins in order to ensure
that downstream port power is not inadvertently enabled to
inactive ports during a hardware reset.
When RESET_N is negated, the logic value will be latched
internally, and will retain the active signal polarity for
PRTPWR[3:1] pins.
‘1’ = PRTPWR[3:1] pins have an active ‘high’ polartity
‘0’ = PRTPWR[3:1] pins have an active ‘low’ polarity
Input from external current monitor indicating an over-
current condition. {Note: Contains internal pull-up to 3.3V
supply}
A 12.0kΩ (+/− 1%) resistor is attached from ground to this
pin to set the transceiver’s internal bias settings.
Serial Data/SMB
Data
Serial Clock/SMB
Clock
&
Chip Select /
EEPROM Select
SMB
Programming
Select
SDA/SMBDATA
SCL/SMBCLK/
CFG_SEL0
CFG_SEL1
SERIAL PORT INTERFACE
IOSD12 (Serial Data)/(SMB Data) signal.
IOSD12
(Serial Clock)/(SMB Clock) signal. This multifunction pin is
read on the rising edge of RESET_N negation and will
determine the hub configuration method as described in
Table 4.2.
I This pin is read on the rising edge of RESET_N negation
and will detemine the hub configuration method as
described in Table 4.2.
CFG_SEL1
0
1
1
Table 4.2 SMBus or EEPROM Interface Behavior
CFG_SEL0 SMBus or EEPROM interface behavior.
X Configured as an SMBus slave for external download of user-defined
descriptors. SMBus slave address is :0101101
0 Internal Default Configuration via strapping options.
1 2-wire (I2C) EEPROMS are supported, and CFG_SEL0 has no other
functionality.
NAME
Crystal
Input/External
Clock Input
SYMBOL
XTAL1/
CLKIN
SMSC USB2503/USB2503A
Table 4.3 Miscellaneous Pins
TYPE
ICLKx
FUNCTION
24MHz crystal or external clock input.
This pin connects to either one terminal of the crystal or
to an external 24MHz clock when a crystal is not used.
11
DATASHEET
Revision 2.1 (12-06-06)
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet USB2503A.PDF ] | |
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