SMSC USB2504A Manual De Usuario

Integrated USB 2.0 Compatible 4-Port Hub

Revision 2.3 (08-27-07)

44

SMSC USB2504/USB2504A

1. Output leakage is measured with the current pins in high impedance.

2. See USB 2.0 Specification for USB DC electrical characteristics.

3. RBIAS is a 3.3V tolerant analog pin.

 = 25°C; fc = 1MHz; V

DD33

There are no power supply sequence restrictions for the Hub. The order in which power supplies
power-up and power-down is implementation dependent.

Supply Current 
Configured
(Full-Speed Host)

1 Port 
2 Ports
3 Ports
4 Ports

I

FCC1

I

FCC2

I

FCC3

I

FCC4

150 
155 
160 
165

mA
mA
mA
mA

Total from all supplies

Supply Current
Suspend

I

CSBY

265 

uA

Total from all supplies.

Supply Current
Reset

I

RST

 150 

uA

Total from all supplies.

Clock Input 
Capacitance

C

IN

12

pF

All pins except USB pins (and pins under 
test tied to AC ground)

Input Capacitance

C

IN

8

pF

Output Capacitance

C

OUT

12

pF