USB2502 datasheet(35/44 Pages) SMSC

35 / 44 page

2-Port USB 2.0 Hub Controller

Datasheet

SMSC USB2502

Revision 2.1 (12-06-06)

DATASHEET

All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC

Parameters", prior to (or coincident with) the assertion of RESET_N.

5.6.1.3

RESET_N for SMBus Slave Configuration

Figure 5.4 Reset_N Timing for SMBus Mode

Notes:

For Bus-Powered configurations, the 99.5ms (MAX) is required, and the Hub and its associated

circuitry must not consume more than 100mA from the upstream USB power source during

t2+t3+t4+t5+t6+t7. For Self-Powered configurations, t3 MAX is not applicable and the time to load

the configuration is determined by the external SMBus host.

All Power Supplies must have reached the operating levels mandated in Section Chapter 7, "DC

Parameters", prior to (or coincident with) the assertion of RESET_N.

Table 5.7 Reset_N Timing for SMBus Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted.

μsec

Hub Recovery/Stabilization.

500

μsec

SMBus Code Load (See Note).

99.5

msec

Hub Configuration and USB Attach.

100

msec

Host acknowledges attach and signals USB

Reset.

100

msec

USB Idle.

Undefined

msec

Completion time for requests (with or without data

stage).

5msec

RESET_N

VSS

Hardware

reset

asserted

Reset

Negation

SMBus Code

Load

Attach

USB

Upstream

USB Reset

recovery

Idle

Start

completion

request

response

Hub PHY

Stabilization

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