Datasheet

USB 2.0 Hi-Speed Hub Controller
Datasheet
Revision 2.3 (06-11-13) 60 SMSC USB251xB/xBi
DATASHEET
Datasheet Revision History
Revision History
REVISION LEVEL & DATE SECTION/FIGURE/ENTRY CORRECTION
Rev. 2.3 (06-11-13) Table 3.1: USB251xB/xBi Pin
List (Alphabetical) on
page 14
Corrected errant description “Server Message
Block” to “System Management Bus”.
Section 7.1:
Oscillator/Crystal
on page 53 and Figure 7.1:
Typical Crystal Circuit on
page 53
Updated figure to remove external 1 M
Ω
requirement. Added note indicating the device
includes and internal1 M
Ω resistor between the
XTALIN and XTALOUT pins.
Figure 3.3: 4-Port 36-Pin
QFN on page 13
Corrected typo on pin 6.
Figure 3.1:
2-Port 36-Pin
QFN on page 11 & Table 3.1:
USB251xB/xBi Pin List
(Alphabetical) on page 14
Added alternate port disable functions to pins 1-4
of the USB2512B.
Rev. 2.2 (02-17-12) Cover Updated clock bullet to remove reference to
48MHz clock support.
Section 1.1: Configurable
Features on page 8
Updated bulleted lists. USB signal drive strength,
USB differential pair pin location and downstream
port power control / over-current detection items
moved from first (strap-configurable) bulleted list
to the second (EEPROM-configurable) bulleted
list. Added enabling of battery charging to the first
bulleted list.
Section 3.1: Pin
Configurations on page 11
Clarified introductory sentence.
Table 3.2: USB251xB/xBi Pin
Descriptions on page 17
Updated VBUS_DET buffer type to “I” and
changed description to: “For self-powered
applications with a permanently attached host,
this pin must be connected to a dedicated host
control output, or connected to the 3.3 V domain
that powers the host (typically
VDD33).”
Table 3.2: USB251xB/xBi Pin
Descriptions on page 17
Updated CRFILT and PLLFILT pin descriptions.
Section 7.1: Oscillator/Crystal
on page 53
Removed redundant sentence: “External Clock:
50% duty cycle
± 10%, 24/48 MHz ± 350 ppm,
jitter
< 100 ps rms”. This information is provided in
Section 7.2:
External Clock on page 54.
Chapter 7: AC Specifications Removed ceramic resonator information.
Section 7.2: External Clock Replaced “1.8 V CMOS Logic” with “1.2 V CMOS
Logic”. Updated XTALOUT description.
Section 3.3: Pin Descriptions
(Grouped by Function)
Updated CRFILT and PLLFILT pin descriptions.
Cover, Package, All Removed the 49-BGA option.