参数资料
型号: RX-4571SA
元件分类: 时钟/数据恢复及定时提取
英文描述: 0 TIMER(S), REAL TIME CLOCK, PDSO14
封装: ROHS COMPLIANT, SOP-14
文件页数: 20/76页
文件大小: 1924K
代理商: RX-4571SA
USB 2.0 Hi-Speed Hub Controller
Datasheet
SMSC USB251x
27
Revision 1.1 (04-26-10)
DATASHEET
5.3
Buffer Type Descriptions
SEL48
I
48 MHz Clock Input Selection
48 MHz external input clock select. When the hub is clocked from an external
clock source, this pin selects either 24 MHz or 48 MHz mode.
‘0’ = 24 MHz
‘1’ = 48 MHz
POWER, GROUND, and NO CONNECTS
CRFILT
VDD Core Regulator Filter Capacitor
This pin must have a 1.0
μF (or greater) ±20% (ESR <0.1 Ω) capacitor to
VSS.
VDD33
3.3 V Power
PLLFILT
PLL Regulator Filter Capacitor
This pin must have a 1.0
μF (or greater) ±20% (ESR <0.1 Ω) capacitor to
VSS.
VSS
Ground Pad / ePad
The package slug is the only VSS for the device and must be tied to ground
with multiple vias.
NC
No Connect
No signal or trace should be routed or attached to these pins.
Table 5.3 Buffer Type Descriptions
BUFFER
DESCRIPTION
I
Input.
I/O
Input/Output.
IPD
Input with internal weak pull-down resistor.
IPU
Input with internal weak pull-up resistor.
IS
Input with Schmitt trigger.
O12
Output 12 mA.
Table 5.2 USB251x Pin Descriptions (continued)
SYMBOL
BUFFER
TYPE
DESCRIPTION
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