USB2503 datasheet(14/46 Pages) SMSC

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USB 2.0 High-Speed 4-Port Hub Controller

Datasheet

Revision 1.92 (05-08-07)

SMSC USB2514

DATASHEET

SUSP_IND/

LOCAL_PWR/

NON_REM0

I/O

Active/Suspend status LED or Local-Power & Non

Removable Strap Option

Suspend Indicator: Indicates USB state of the hub.

‘negated’ = Unconfigured, or configured and in USB

Suspend

‘asserted’ = Hub is configured, and is active (i.e., not in

suspend)

Local Power: Detects availability of local self-power

source.

Low = Self/local power source is NOT available (i.e.,

Hub gets all power from Upstream USB VBus).

High = Self/local power source is available.

NON_REM0 Strap Option:

If this strap is enabled by package and configuration

settings (see Table 3.2), this pin will be sampled (in

conjunction with NON_REM1) at RESET_N negation to

determine if ports [4:1] contain permanently attached

(non-removable) devices. Also, the active state of the

LED

will be determined as follows:

NON_REM[1:0] = ‘00’, All ports are removable, and the

LED is active high

NON_REM[1:0] = ‘01’, Port 1 is nonremovable, and the

LED is active low

NON_REM[1:0] = ‘10’, Ports 1 & 2 are non-removable,

and the LED is active high

NON_REM[1:0] = ‘11’, Ports 1, 2 & 3 are non-

removable, and the LED is active low

TEST

IPD

TEST pin

XNOR continuity tests all signal pins on the hub, please

contact your SMSC representative for a detailed

description of how this test mode is enabled and utilized.

SEL48

n/a

IPD

Select 48 MHz clock input

48MHz external clock input select:. When the hub is

clocked from an external clock source, this pin selects

either 24MHz or 48MHz

mode.

‘0’ = 24MHz

‘1’ = 48MHz

REG_EN

n/a

IPU

Regulator Enable

REG_EN: This pin is internally pulled up to enable the

internal 1.8V regulators, and this pin should be treated

as a no-connect.

In order to disable the regulators, this pin will need to be

externally connected to ground.

When the internal regulator is enabled, the 1.8V power

pins must be left

unconnected, except for the required bypass capacitors.

Table 3.1 USB2514 Pin Descriptions (continued)

SYMBOL

36 QFN

48 QFN

BUFFER

TYPE

DESCRIPTION

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