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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)： | 4/20頁 |
| 文件大?。?/td> | 143K |
| 代理商： | 97CFDC |
SMSC DS – USB97CFDC
Page 12
Rev. 12/15/2000
PARAMETER
SYMBOL
MIN
TYP
MAX
UNITS
COMMENTS
O24 Type Buffer
Low Output Level
High Output Level
Output Leakage
VOL
VOH
IOL
2.4
-10
0.4
+10
V
A
IOL = 24mA
IOH = -12mA
VIN = 0 to Vcc (Note 1)
OD24 Type Buffer
Low Output Level
Output Leakage
VOL
IOL
-10
0.4
+10
V
A
IOL = 24mA
VIN = 0 to Vcc (Note 1)
IO-U
Note 2
Supply Current Active
Supply Current
Standby
ICC
ICSBU
30
120
75
300
MA
A
All outputs open.
Note 1: Output leakage is measured with the current pins in high impedance.
Note 2: See Appendix A for USB DC electrical characteristics.
CAPACITANCE TA = 25°C; fc = 1MHz; VCC = 3.3V
LIMITS
PARAMETER
SYMBOL
MIN
TYP
MAX
UNIT
TEST CONDITION
Clock Input Capacitance
CIN
20
pF
Input Capacitance
CIN
10
pF
Output Capacitance
COUT
20
pF
All pins except USB pins
(and pins under test tied
to AC ground)
AC PARAMETERS
t2
t1
t2
CLOCKI
FIGURE 1 - INPUT CLOCK TIMING
Table 2 – Input Clock Timing Parameters
NAME
DESCRIPTION
MIN
TYP
MAX
UNITS
t1
Clock Cycle Time for 14.318MHz
69.84
ns
t2
Clock High Time/Low Time for 24MHz
41.9/
27.9
27.9/
41.9
ns
tr, tf
Clock Rise Time/Fall Time (not shown)
5
ns
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