USB2504-JD Standard Microsystems Corp., USB2504-JD Datasheet - Page 13

• Manufacturer Part Number: USB2504-JD
• Description: Interface, Integrated USB2.0 Compatible 4-Port Hub
• Manufacturer: Standard Microsystems Corp.

Integrated USB2.0 Compatible 4-Port Hub
Datasheet
SMSC USB2504
Serial Clock/SMB
Crystal Output
Input/External
RESET Input
CFG_SEL2
Programming
Programming
Programming
Clock Input
Clock Input
Configuration
Configuration
Configuration
Crystal
Enable
NAME
NAME
Select
Select
Select
Clock
X
X
X
0
1
CFG_SEL1
CLKIN_EN
RESET_N
SCL/SMBCLK
SYMBOL
CFG_SEL0
CFG_SEL1
CFG_SEL2
XTAL1/
CLKIN
XTAL2
0
0
1
1
1
SYMBOL
Table 4.1 4-Port Hub Pin Descriptions (continued)
Table 4.2 SMBus or EEPROM Interface Behavior
CFG_SEL0
Table 4.3 Miscellaneous Pins
IOSD812
0
1
0
0
1
IOSD12
OCLKx
TYPE
ICLKx
TYPE
IS
I
I
I
SMBus or EEPROM interface behavior.
Configured as an SMBus slave for external download of user-
defined descriptors. SMBus slave address is 0101100
Configured as an SMBus slave for external download of user-
defined descriptors. SMBus slave address is 0101101
Internal Default Configuration
Internal Default Configuration via strapping options.
2-wire (I2C) EEPROMS are supported,
(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
This pin is read on the rising edge of RESET_N negation
and will determine the hub configuration method as
described in
This pin is read on the rising edge of RESET_N negation
and will determine the hub configuration method as
described in
7
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.
24MHz Crystal
This is the other terminal of the crystal, or left
unconnected when an external clock source is used to
drive XTAL1/CLKIN. It must not be used to drive any
external circuitry other than the crystal circuit.
Clock In Enable:
Low = XTAL1 and XTAL2 pins configured for use with
external crystal
High = XTAL1 pin configured as CLKIN, and must be
driven by an external CMOS clock.
This active low signal is used by the system to reset the
chip. The minimum active low pulse is 1us.
Table
Table
4.2.
4.2.
FUNCTION
FUNCTION
Table
Revision 1.3 (06-28-04)
4.2.