參數(shù)資料
型號(hào): USS820D-DB
英文描述: USS-820D USB Device Controller
中文描述: 號(hào)- 820D USB設(shè)備控制器
文件頁(yè)數(shù): 49/58頁(yè)
文件大?。?/td> 868K
代理商: USS820D-DB
Agere Systems Inc.
49
Data Sheet, Rev. 4
June 2001
USB Device Controller
USS-820D
Electrical Characteristics
(continued)
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
.
Parameter
Symbol
Test Conditions
Min
Max
Unit
Rise and Fall Times:
(10%—90%)
(90%—10%)
Rise/Fall Time Matching
Crossover Point
Output Impedance*
t
R
t
F
OEN = 0, C
L
= 50 pF
OEN = 0, C
L
= 50 pF
OEN = 0, C
L
= 50 pF
OEN = 0, C
L
= 50 pF
OEN = 0
4
4
90
1.3
28
20
20
110
2.0
43
ns
ns
%
V
t
RFM
V
CRS
Z
DRV
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