PIC18F4550-IP Datasheet, PDF (404/438 Pages) Microchip Technology – 28/40/44-Pin, High-Performance, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

PIC18F2455/2550/4455/4550
FIGURE 28-21:
USB SIGNAL TIMING
USB Data Differential Lines
90%
VCRS
10%
TLR, TFR
TLF, TFF
TABLE 28-25: USB LOW-SPEED TIMING REQUIREMENTS
Param
No.
Symbol
Characteristic
Min Typ
T01 TLR
T02 TLF
T03 TLRFM
Transition Rise Time
Transition Fall Time
Rise/Fall Time Matching
75
—
75
—
80
—
Max Units
Conditions
300
ns CL = 200 to 600 pF
300
ns CL = 200 to 600 pF
125
%
TABLE 28-26: USB FULL-SPEED REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
T04 TFR
Transition Rise Time
4
T05 TFF
Transition Fall Time
4
T06 TFRFM Rise/Fall Time Matching
90
Typ Max Units
Conditions
—
20
ns CL = 50 pF
—
20
ns CL = 50 pF
— 111.1 %
DS39632E-page 402
© 2009 Microchip Technology Inc.