USB2503-HZH Standard Microsystems Corp., USB2503-HZH Datasheet - Page 32

• Manufacturer Part Number: USB2503-HZH
• Description: Interface, Integrated USB2.0 Compatible 3-Port Hub
• Manufacturer: Standard Microsystems Corp.

Revision 1.3 (08-24-04)
5.6.1.1
NAME
RESET_N
Strap Pins
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).
6. The PLL is halted.
7. LED indicators are disabled.
The Hub is “operational” 500µs after RESET_N is negated.
Once operational, the Hub immediately reads OEM-specific data from the external EEPROM (if the
SMBus option is not disabled).
RESET_N for Strapping Option Configuration
Note: When in Bus-Powered mode, the Hub and its associated circuitry must not consume more than
Don’t Care
100mA from the upstream USB power source during t1+t5.
Figure 5.2 Reset_N Timing for Default/Strap Option Mode
Read Strap
t1
Table 5.5 Reset_N Timing for Default/Strap Option Mode
Options
DESCRIPTION
t2
Valid
t3
t4
Don’t Care
Drive Strap
Outputs to
inactive
levels
t5
27
Upstream
Attach
USB
Driven by Hub if strap is an output.
16.7
16.7
MIN
100
1
USB Reset
recovery
t6
undefined
Integrated USB2.0 Compatible 3-Port Hub
TYP
2.0
t7
Idle
MAX
1400
100
1.5
5
t8
completion
response
SMSC USB2503
request
Start
UNITS
Datasheet
msec
msec
msec
msec
µsec
nsec
nsec
µsec