USB2507 Datasheet, PDF (13/44 Pages) SMSC Corporation – Integrated USB 2.0 Compatible 7-Port Hub

Integrated USB 2.0 Compatible 7-Port Hub
Datasheet
Table 4.3 Miscellaneous Pins (continued)
NAME
Analog Test
&
Internal 1.8V
voltage
regulator
enable
SYMBOL
ATEST/
REG_EN
TYPE
AIO
FUNCTION
This signal is used for testing the analog section of the
chip, and to enable or disable the internal 1.8v regulator.
This pin must be connected to VDDA33 to enable the
internal 1.8V regulator, or to VSS to disable the internal
regulator.
When the internal regulator is enabled, the 1.8V power
pins must be left unconnected, except for the required
bypass capacitors.When the PHY is in test mode, the
internal regulator is disabled and the ATEST pin
functions as a test pin.
NAME
VDDCORE3P3
VDD1P8
VDDAPLL3P3
VDDAPLL1P8
VDDIO3P3
VDDA3P3
VSS
Table 4.4 Power, Ground, and No Connect
SYMBOL
TYPE
FUNCTION
VDD33CR
VDD18
VDDA33PLL
VDDA18PLL
VDD33
VDDA33
VSS
+3.3V I/O Power.
If the internal core 1.8V regulator is enabled, then this pin
acts as the regulator input
+1.8V core power.
If the internal regulator is enabled, then VDD18 pin 50
must have a 4.7μF (or greater) ±20% (ESR <0.1Ω)
capacitor to VSS
+3.3V Filtered analog power for the internal PLL
If the internal PLL 1.8V regulator is enabled, then this pin
acts as the regulator input
+1.8V Filtered analog power for internal PLL.
If the internal regulator is enabled, then this pin must
have a 4.7μF (or greater) ±20% (ESR <0.1Ω) capacitor
to VSS
+3.3V I/O power.
+3.3V Filtered analog power.
Ground.
BUFFER
I
IPD
IPU
IS
O12
Table 4.5 Buffer Type Descriptions
DESCRIPTION
Input.
Input, with a weak Internal pull-down.
Input, with a weak Internal pull-up.
Input with Schmitt trigger.
Output 12mA.
SMSC USB2507
13
DATASHEET
Revision 2.1 (12-06-06)