USB2524 SMSC Corporation, USB2524 Datasheet - Page 16

• Manufacturer Part Number: USB2524
• Description: USB MultiSwitch Hub
• Manufacturer: SMSC Corporation

Revision 1.2 (07-17-06)
Crystal Output
Input/External
RESET Input
Self-Power /
VDDIO 3.3V
Clock Input
Bus-Power
VDD Core
TEST Pin
NAME
Crystal
NAME
NAME
Detect
1
1
1
1
SYMBOL
SELF_PWR
RESET_N
VDDCR18
SYMBOL
SYMBOL
XTAL1/
VDD33
CLKIN
XTAL2
TEST
Table 5.2 SMBus or EEPROM Interface Behavior (continued)
0
0
1
1
Table 5.4 Power, Ground, and No Connect
TYPE
Table 5.3 Miscellaneous Pins
OCLKx
0
1
0
1
ICLKx
TYPE
TYPE
IPD
IS
I
DATASHEET
Internal Default Configuration
Internal Default Configuration
Reserved
Reserved
4-Wire Mode = (edge triggered)
LED Mode = 8, single color
Strap options on pins LED_A[4:1]_N are enabled.
Supports unassigned Ports
4-Wire Mode = (edge triggered)
LED Mode = 8, Dual color
Strap options on pins LED_A[4:1]_N are disabled
Supports unassigned Ports.
16
24MHz crystal or external clock input.
This pin connects to either one terminal of the crystal or
to an external 24MHz clock when a crystal is not used.
Note:
24MHz Crystal
This is the other terminal of the crystal, or left
unconnected when an external clock source is used to
drive XTAL1/CLKIN. It must not be used to drive any
external circuitry other than the crystal circuit.
This active low signal is used by the system to reset the
chip. The minimum active low pulse is 1us.
Detects availability of local self-power source.
Low = Self/local power source is NOT available (i.e., Hub
gets all power from Upstream USB VBus).
High = Self/local power source is available.
Used for testing the chip. User must treat as a no-
connect or connect to ground.
+1.8V core power.
pin 20 must have a 4.7
<0.1
+3.3V Power Supply for the Digital I/O.
Ω)
capacitor to VSS
See
levels of this pad if it will be driven by an
external clock source.
Table 11.1
FUNCTION
FUNCTION
FUNCTION
μ
for the required logic voltage
F (or greater) ±20% (ESR
USB MultiSwitch
SMSC USB2524
Datasheet
TM
Hub