USB2502-HT datasheet(34/44 Pages) SMSC

34 / 44 page

2-Port USB 2.0 Hub Controller

Datasheet

Revision 2.1 (12-06-06)

SMSC USB2502

DATASHEET

Notes:

When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than

100mA from the upstream USB power source during t1+t5.

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.

5.6.1.2

RESET_N for EEPROM Configuration

Figure 5.3 Reset_N Timing for EEPROM Mode

Notes:

When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than

100mA from the upstream USB power source during t4+t5+t6+t7.

Host acknowledges attach and signals USB

Reset.

100

msec

USB Idle.

undefined

msec

Completion time for requests (with or without data

stage).

5msec

Table 5.6 Reset_N Timing for EEPROM Mode

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N Asserted.

μsec

Hub Recovery/Stabilization.

500

μsec

EEPROM Read / Hub Config.

2.0

99.5

msec

USB Attach (See Note).

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

Table 5.5 Reset_N Timing for Default/Strap Option Mode (continued)

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N

VSS

Hardware

reset

asserted

Read Strap

Options

Read EEPROM

Set Options

Attach

USB

Upstream

USB Reset

recovery

Idle

Start

completion

request

response

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