µPD31172
(11) USB interface
Applicable to the DP (2:1) and DN (2:1) pins. Refer to the USB specification, revision 1.0, for details.
Parameter
Rise time
Symbol
tR
Conditions
CL = 50 pF
MIN.
4
MAX.
20
Unit
ns
ns
%
Full-speed
mode
Fall time
tF
CL = 50 pF
tR/tF
4
20
tR, tF matching
tRFM
VCRS
90
1.3
110
2.0
Differential output signal
crossover point
V
Low-speed
mode
Rise time
tR
CL = 50 pF
CL = 350 pF
CL = 50 pF
CL = 350 pF
tR/tF
75
75
ns
ns
ns
ns
%
V
300
Fall time
tF
300
120
2.0
tR, tF matching
tRFM
80
Differential output signal
crossover point
VCRS
1.3
Impedance
Imp.
28
43
Ω
90%
90%
V
CRS
DP (2:1), DN (2:1)
10%
10%
t
R
t
F
37
Data Sheet U14388EJ2V0DS00
NEC [ NEC ]
