USB2513 datasheet(45/63 Pages) MICROCHIP

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USB 2.0 Hi-Speed Hub Controller

Datasheet

SMSC USB251xB/xBi

Revision 2.2 (02-17-12)

DATASHEET

5.5.1.1

RESET_N for Strapping Option Configuration

Figure 5.3 Reset_N Timing for Default Configuration

Notes:

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 Chapter 6: DC Parameters,

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

NAME

DESCRIPTION

MIN

TYP

MAX

UNITS

RESET_N asserted

μs

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

μs

USB attach (see notes)

100

Host acknowledges attach and signals USB reset

100

USB idle

undefined

Completion time for requests (with or without data

stage)

5msec

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

USB reset

recovery

Idle

Start completion

request response

don’t care

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