USB2514 datasheet(13/46 Pages) SMSC

13 / 46 page

USB 2.0 High-Speed 4-Port Hub Controller

Datasheet

SMSC USB2514

Revision 1.92 (05-08-07)

DATASHEET

CFG_SEL2

n/a

Configuration Programming Select

Note:

This pin is not available in all packages; it is

held to a logic ‘0’ when not available

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"

MISC

XTAL1/

CLKIN

ICLKx

Crystal Input/External Clock Input

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:

48MHz only available in 48 QFN.

XTAL2

OCLKx

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_N

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.

Table 3.1 USB2514 Pin Descriptions (continued)

SYMBOL

36 QFN

48 QFN

BUFFER

TYPE

DESCRIPTION

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