USB2504/USB2504A

DS000002250A-page 28

 2007 - 2016 Microchip Technology Inc.

Note 1: 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.

2: All Power Supplies must have reached the operating levels mandated in Section 8.0, "DC Parameters", prior

to (or coincident with) the assertion of RESET_N.

5.6.1.2

RESET_N for EEPROM Configuration

Note 1: 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.

2: All Power Supplies must have reached the operating levels mandated in Section 8.0, "DC Parameters", prior

to (or coincident with) the assertion of RESET_N.

t5

USB Attach (See Note).

100

msec

t6

Host acknowledges attach and signals USB Reset.

100

msec

t7

USB Idle.

undefined

msec

t8

Completion time for requests (with or without data

stage).

5

msec

FIGURE 5-3:

RESET_N TIMING FOR EEPROM MODE

TABLE 5-6:

RESET_N TIMING FOR EEPROM MODE

Name

Description

MIN

TYP

MAX

Units

t1

RESET_N Asserted.

1

sec

t2

Hub Recovery/Stabilization.

500

sec

t3

EEPROM Read / Hub Config.

2.0

99.5

msec

t4

USB Attach (See Note).

100

msec

t5

Host acknowledges attach and signals USB Reset.

100

msec

t6

USB Idle.

undefined

msec

t7

Completion time for requests (with or without data

stage).

5

msec

TABLE 5-5:

RESET_N TIMING FOR DEFAULT/STRAP OPTION MODE (CONTINUED)

Name

Description

MIN

TYP

MAX

Units

t1

t2

t4

t5

t6

t7

RESET_N

VSS

Hardware

reset

asserted

Read Strap

Options

Read EEPROM

+

Set Options

Attach

USB

Upstream

USB Reset

recovery

Idle

Start

completion

request

response

t3