SMSC USB2502 Manual de usuario Pagina 41
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2-Port USB 2.0 Hub Controller
Datasheet
SMSC USB2502 41 Revision 2.3 (08-27-07)
DATASHEET
Notes:
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.
CAPACITANCE T
A
= 25°C; fc = 1MHz; V
DD33CR
= 3.3V
Power Sequencing
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
Suspend
I
CSBY
320 425 uA Total from all supplies.
Supply Current
Reset
I
RST
160 300 uA Total from all supplies.
LIMITS
PARAMETER SYMBOL MIN TYP MAX UNIT TEST CONDITION
Clock Input
Capacitance
C
IN
12 pF All pins except USB pins (and pins under
test tied to AC ground)
Input Capacitance C
IN
8pF
Output Capacitance C
OUT
12 pF
Table 7.1 DC Electrical Characteristics (continued)
PARAMETER SYMBOL MIN TYP MAX UNITS COMMENTS
- USB2502 1
- 2-Port USB 2.0 Hub 1
- Controller 1
- Table of Contents 3
- List of Tables 4
- List of Figures 5
- Chapter 1 General Description 6
- Chapter 2 Pin Table 2-Port 7
- (Top View QFN-36) 9
- DATASHEET 10
- NAME SYMBOL TYPE FUNCTION 11
- UPSTREAM USB 2.0 INTERFACE 11
- 5.1 2-Port Hub 16
- 5.1.2 VBus Detect 18
- 5.2 EEPROM Interface 19
- 5.3 SMBus Slave Interface 24
- TIMEOUT, MIN 26
- TIMEOUT, MAX 26
- 5.6 Reset 32
- 2-Port USB 2.0 Hub Controller 33
- Datasheet 33
- 5.6.2 USB Bus Reset 36
- Chapter 6 XNOR Test 37
- Chapter 7 DC Parameters 38
- Chapter 8 AC Specifications 42
- Chapter 9 Package Outlines 43
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