L-USS820D-DB LSI, L-USS820D-DB Datasheet - Page 48

• Manufacturer Part Number: L-USS820D-DB
• Manufacturer: LSI

Specifications of L-USS820D-DB

• Operating Temperature (min): -20C
• Operating Temperature Classification: Commercial
• Operating Temperature (max): 85C
• Rad Hardened: No
• Lead Free Status / RoHS Status: Compliant

USS-820D
USB Device Controller
USB Device Controller
Electrical Characteristics
Power Considerations
The USB specification places current limits on bus-powered devices. The limit is tighter for a device that has not
yet been configured. The tightest limit is for a suspended device.
The current values listed in Table 44 for a preconfigured device assume fairly low activity (about 5%) on USB. The
maximum value for a configured device assumes the device is transmitting 80% of the time on USB. All current
values assume a 35 pF load on the package pins.
The limit for suspended devices can only be met if careful measures are taken to control the interface to the USS-
820D, as documented in the SUSPEND and RESUME Behavior section.
USB Transceiver Driver Characteristics
Table 45. USB Transceiver Driver Characteristics
* At steady-state drive, when used with an external series resistor of 24 Ω.
48
Rise and Fall Times:
Rise/Fall Time Matching
Crossover Point
Output Impedance*
(10%—90%)
(90%—10%)
Parameter
(continued)
Symbol
V
Z
t
RFM
DRV
CRS
t
t
R
F
OEN = 0, C
OEN = 0, C
OEN = 0, C
OEN = 0, C
Test Conditions
OEN = 0
L
L
L
L
= 50 pF
= 50 pF
= 50 pF
= 50 pF
Min
1.3
90
28
4
4
Data Sheet, Rev. 7
September 2004
Agere Systems Inc.
Max
110
2.0
20
20
43
Unit
ns
ns
%
V
Ω