USB2504A View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
MFG CO.
'USB2504A' PDF : 46 Pages View PDF
Integrated USB 2.0 Compatible 4-Port Hub
Datasheet
5.6.1.1
RESET_N for Strapping Option Configuration
Hardware
reset
asserted
Read Strap
Options
Drive Strap
Attach
Start
Outputs to
inactive
levels
USB
Upstream
USB Reset
recovery
Idle
completion
request
response
t1
t5
t2
t3
RESET_N
t6
t7
t8
VSS
t4
Strap Pins
VSS
Don’t Care
Valid
Don’t Care
Driven by Hub if strap is an output.
Figure 5.2 Reset_N Timing for Default/Strap Option Mode
Table 5.5 Reset_N Timing for Default/Strap Option Mode
NAME
DESCRIPTION
t1
RESET_N Asserted.
t2
Strap Setup Time
t3
Strap Hold Time.
t4
hub outputs driven to inactive logic states
t5
USB Attach (See Note).
t6
Host acknowledges attach and signals USB
Reset.
t7
USB Idle.
t8
Completion time for requests (with or without data
stage).
MIN
TYP
MAX
1
16.7
16.7
1400
2.0
1.5
100
100
undefined
5
UNITS
μsec
nsec
nsec
μsec
msec
msec
msec
msec
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 8, "DC
Parameters", prior to (or coincident with) the assertion of RESET_N.
SMSC USB2504/USB2504A
35
DATASHEET
Revision 2.3 (08-27-07)
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