USB2514I SMSC Corporation, USB2514I Datasheet - Page 13

• Manufacturer Part Number: USB2514I
• Description: Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller
• Manufacturer: SMSC Corporation

Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller
Datasheet
SMSC USB2514i
CFG_SEL2
RESET_N
SYMBOL
XTAL1/
CLKIN
XTAL2
36 QFN
n/a
33
32
26
Table 3.1 USB2514 Pin Descriptions (continued)
48 QFN
33
45
44
34
BUFFER
OCLKx
ICLKx
TYPE
DATASHEET
IS
I
MISC
13
Configuration Programming Select
Crystal Input/External Clock Input
Note:
The logic state of this pin is internally latched on the
rising edge of RESET_N (RESET_N negation), and will
determine the hub configuration method as described in
Table 3.2, "SMBus or EEPROM Interface Behavior"
24MHz crystal or external clock input.
This pin connects to either one terminal of the crystal or
to an external 24/48MHz clock when a crystal is not
used.
Note:
Crystal Output
24MHz Crystal
This is the other terminal of the crystal, or pulled high
when an external clock source is used to drive
XTAL1/CLKIN. This output must not be used to drive
any external circuitry other than the crystal circuit.
RESET Input
The system can reset the chip by driving this input low.
The minimum active low pulse is 1 us.
When the RESET_N pin is pulled to VDD33, the internal
POR (Power on Reset) is enabled and no external reset
circuitry is required. The internal POR holds the internal
logic in reset until the power supplies are stable.
held to a logic ‘0’ when not available
This pin is not available in all packages; it is
48MHz only available in 48 QFN.
DESCRIPTION
Revision 1.98 (11-19-07)