Microchip Technology TMPSNS-RTD1 Datenbogen
PIC18F2455/2550/4455/4550
DS39632E-page 402
© 2009 Microchip Technology Inc.
FIGURE 28-21:
USB SIGNAL TIMING
TABLE 28-25: USB LOW-SPEED TIMING REQUIREMENTS
TABLE 28-26: USB FULL-SPEED REQUIREMENTS
V
CRS
USB Data Differential Lines
90%
10%
T
LR
, T
FR
T
LF
, T
FF
Param
No.
Symbol
Characteristic
Min
Typ
Max
Units
Conditions
T01
T
LR
Transition Rise Time
75
—
300
ns
C
L
= 200 to 600 pF
T02
T
LF
Transition Fall Time
75
—
300
ns
C
L
= 200 to 600 pF
T03
T
LRFM
Rise/Fall Time Matching
80
—
125
%
Param
No.
Symbol
Characteristic
Min
Typ
Max
Units
Conditions
T04
T
FR
Transition Rise Time
4
—
20
ns
C
L
= 50 pF
T05
T
FF
Transition Fall Time
4
—
20
ns
C
L
= 50 pF
T06
T
FRFM
Rise/Fall Time Matching
90
—
111.1
%