FUJITSU MB91401 - Manual (Page 51)

MB91401
51
USB Specification Revision 1.1
*1 :
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 :
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 :
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)
Prelminary
2004.11.12