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參數(shù)資料
| 型號： | 97CFDC |
| 廠商： | SMSC Corporation |
| 英文描述： | USB FLOPPY DISK CONTROLLER |
| 中文描述： | 軟盤控制器的USB |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 143K |
| 代理商： | 97CFDC |
SMSC DS – USB97CFDC
Page 15
Rev. 12/15/2000
USB PARAMETERS
The following tables and diagrams were obtained from the USB specification
USB DC PARAMETERS
0.0
0.2
0.4
0.6
0.8
1.0
0.0
0.2 0.4
0.6
0.8 1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
Common Mode Input Voltage (volts)
M
in
im
u
m
Di
ff
er
e
n
ti
a
lS
e
n
s
it
iv
it
y
(vo
lts
)
FIGURE 6 - DIFFERENTIAL INPUT SENSITIVITY OVER ENTIRE COMMON MODE RANGE
Table 6 - DC Electrical Characteristics
PARAMETER
SYMBOL
CONDITIONS
(NOTE 1, 2)
MIN
TYP
MAX
UNIT
Supply Voltage
Powered (Host or Hub) Port
VBUS
4.4
5.25
V
Supply Current
Function
ICC
Note 4
100
mA
Un-configured Function (in)
ICCINIT
Note 5
100
uA
Suspend Device
ICCS
100
uA
Leakage Current
Hi-Z State Data Line
Leakage
ILO
0 V < VIN < 3.3
V
-10
10
uA
Input Levels
Differential Input Sensitivity
VDI
|(D+) - (D-)|,
and FIGURE 6
0.2
V
Differential Common Mode
Range
VCM
Includes VDI
0.8
2.5
V
Single Ended Receiver
Threshold
VSE
0.8
2.0
V
Output Levels
Static Output Low
VOL
RL of 1.5 K
to
3.6 V
0.3 (3)
V
Static Output High
VOH
RL of 15 K
to
GND
2.8
3.6 (3)
V
Capacitance
Transceiver Capacitance
CIN
Pin to GND
20
pF
Terminals
Bus Pull-up Resistor on
Root Port
RPU
(1.5 K
+/- 5%)
1.425
1.575
k
Bus Pull-down Resistor on
Downstream Port
RPD
(15 K
+/- 5%)
14.25
15.75
k
Note 1: All voltages are measured from the local ground potential, unless otherwise specified.
Note 2: All timing use a capacitive load (CL) to ground of 50pF, unless otherwise specified.
Note 3: This is relative to VUSBIN.
Note 4: This is dependent on block configuration set by software.
Note 5: When the internal ring oscillator and waiting for first setup packet.
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