USB2514I SMSC Corporation, USB2514I Datasheet - Page 39

• Manufacturer Part Number: USB2514I
• Description: Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller
• Manufacturer: SMSC Corporation

Industrial Temperature Rated USB 2.0 High-Speed 4-Port Hub Controller
Datasheet
SMSC USB2514i
4.7.2.1
RESET_N
Strap Pins
NAME
t1
t2
t3
t4
t5
t6
t7
t8
VSS
VSS
Hardware
asserted
reset
RESET_N Asserted.
Strap Setup Time
Strap Hold Time.
hub outputs driven to inactive logic states
USB Attach (See Note).
Host acknowledges attach and signals USB
Reset.
USB Idle.
Completion time for requests (with or without data
stage).
Don’t Care
RESET_N for Strapping Option Configuration
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
Parameters, prior to (or coincident with) the assertion of RESET_N.
Read Strap
t1
Options
Figure 4.4 Reset_N Timing for Default/Strap Option Mode
Table 4.5 Reset_N Timing for Default/Strap Option Mode
t2
Valid
DESCRIPTION
t3
t4
Don’t Care
Drive Strap
Outputs to
inactive
levels
DATASHEET
t5
39
Upstream
Attach
USB
Driven by Hub if strap is an output.
16.7
16.7
MIN
100
1
USB Reset
recovery
t6
undefined
TYP
1.5
t7
Idle
Chapter 5, DC
MAX
1400
Revision 1.98 (11-19-07)
100
2
5
t8
completion
response
request
Start
UNITS
msec
msec
msec
msec
μsec
nsec
nsec
μsec