Table 4.5 buffer type descriptions, Datasheet – SMSC USB2524 User Manual
Page 16
USB MultiSwitch
TM
Hub
Datasheet
Revision 1.91 (08-22-07)
16
SMSC USB2524
DATASHEET
VDD PLL
VDDPLL18
+1.8V Filtered analog power for internal PLL.
This pin must have a 4.7
μ
F (or greater) ±20% (ESR
<0.1
Ω)
capacitor to VSS
VDD Analog
I/O
VDDA33
+3.3V Filtered analog PHY power, shared between
adjacent ports.
VSS
VSS
Ground
NC
NC
No Connect
Table 4.5 Buffer Type Descriptions
BUFFER
DESCRIPTION
I
Input.
IPD
Input, Weak Internal pull-down.
IPU
Input, Weak Internal pull-up.
IS
Input with Schmitt trigger.
IOSD12
Open drain….12mA sink with Schmitt trigger, and must meet I2C-Bus Specification Version 2.1
requirements.
ICLKx
XTAL Clock Input
OCLKx
XTAL Clock Output
I-R
RBIAS
IO-U
Defined in USB Specification.
Note:
Meets USB 1.1 requirements when operating as a 1.1-compliant device and meets
USB 2.0 requirements when operating as a 2.0-compliant device.
AIO
Analog Input/output. Per PHY test requirements.
Table 4.4 Power, Ground, and No Connect (continued)
NAME
SYMBOL
TYPE
FUNCTION