USB2514BT-ISLASHM2 datasheet(36/57 Pages) MICROCHIP

36 / 57 page

USB251xB/xBi

DS00001692C-page 36

 2010 - 2015 Microchip Technology Inc.

5.5.1.1

RESET_N for Strapping Option Configuration

Note 5-1

10 ms for hubs, 50 ms for root ports.

FIGURE 5-1:

RESET_N TIMING FOR DEFAULT CONFIGURATION

Name

Description

MIN

TYP

MAX

Units

RESET_N asserted

s

CFG_SEL[1:0] setup time

16.7

CFG_SEL[1:0] hold time

16.7

1400

Hub outputs driven to inactive logic states

1.5

s

USB attach (see notes)

s

Host acknowledges attach and signals USB reset

100

USB_RESET

Host

Defined

USB_RESET State

Note 5-1

USB Reset Recovery

Note:

• When in bus-powered mode, the hub and its associated circuitry must not consume more than 100 mA from the

upstream USB power source during t1+t5.

• All power supplies must have reached the operating levels mandated in Section 6.0, "DC Parameters", prior to

(or coincident with) the assertion of RESET_N.

valid

driven by hub if strap is an output

RESET_N

VSS

CFG_SEL[2:0]

VSS

Hardware

reset asserted

Read

CFG_SEL[1:0]

Drive strap

outputs to

inactive levels

Attach USB

upstream

Attach

Debounce

Interval

USB_RESET

State

don’t care

USB Reset

Recovery

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