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USB2502-HT Datenblatt(PDF) 26 Page - Microchip Technology

Teilenummer USB2502-HT
Bauteilbeschribung  2-Port USB 2.0 Hub Controller
PDF  40 Pages
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Hersteller  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2502-HT Datenblatt(HTML) 26 Page - Microchip Technology

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USB2502
DS000002248A-page 26
 2007 - 2016 Microchip Technology Inc.
5.6.1.1
RESET_N for Strapping Option 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 t1+t5.
2:
All Power Supplies must have reached the operating levels mandated in Section 7.0, "DC Parameters", prior
to (or coincident with) the assertion of RESET_N.
FIGURE 5-2:
RESET_N TIMING FOR DEFAULT/STRAP OPTION MODE
TABLE 5-5:
RESET_N TIMING FOR DEFAULT/STRAP OPTION MODE
Name
Description
MIN
TYP
MAX
Units
t1
RESET_N Asserted.
1
sec
t2
Strap Setup Time
16.7
nsec
t3
Strap Hold Time.
16.7
1400
nsec
t4
hub outputs driven to inactive logic states
2.0
1.5
sec
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).
5msec
t1
t4
t5
t6
t7
t8
Valid
Don’t Care
Don’t Care
Driven by Hub if strap is an output.
RESET_N
VSS
Strap Pins
VSS
Hardware
reset
asserted
Read Strap
Options
Drive Strap
Outputs to
inactive
levels
Attach
USB
Upstream
USB Reset
recovery
Idle
Start
completion
request
response
t2
t3



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