MB91401
51
USB Specification Revision 1.1
*1 : <Input Levels V
IH
, V
IL
>
The switching threshold voltage of the USB I/O buffer’s single-end receiver is set within the range from
V
IL (Max)
=
0.8 V to V
IH (Min)
=
2.0 V (TTL input standard) .
For V
IH
and V
IL
, the LSI has some hysteresis to reduce noise susceptibility.
*2 : <Input Levels V
DI
, V
CM
>
A differential receiver is used to receive USB differential data signals.
The differential receiver has a differential input sensitivity of 200 mV when the differential data input falls within
the range from 0.8 V to 2.5 V with respect to the local ground reference level.
The above voltage range is referred to as common-mode input voltage range.
*3 : <Output Levels V
OL
, V
OH
>
The output driving performance levels of the driver are 0.3 V or less (to 3.6-V, 1.5 k
Ω
load) in the low
state (V
OL
) and 2.8 V or more (to ground, 1.5 k
Ω
load) in the high state (V
OH
) .
Parameter
Symbol
Value
Unit
Remarks
Min
Max
Input Levels
High (driven)
V
IH
2.0
V
*1
Low
V
IL
0.8
V
*1
Diffential Input Sensitivity
V
DI
0.2
V
*2
Differential Common Mode Range
V
CM
0.8
2.5
V
*2
Output Levels
High (driven)
V
OH
0.0
0.3
V
*3
Low
V
OL
2.8
3.6
V
*3
Output Signal Crossover Voltage
V
CRS
1.3
2.0
V
*4
Terminations
Bus Pull-up Resistor on Upstream Port
R
PU
1.425
1.575
k
Ω
1.5 k
Ω
±
5
%
Termination Voltage for Upstream Port
Pull-up
V
TERM
3.0
3.6
V
*5
0.8
0.2
1.0
2.5
Common mode input voltage (V)
Minim
u
m oper
ating input
sensitivity (V)
Summary of Contents for MB91401
Page 71: ...MB91401 71 MEMO ...
