PIC18F2450 Datasheet, PDF (292/320 Pages) Microchip Technology – 28/40/44-Pin, High-Performance, 12 MIPS, Enhanced Flash, USB Microcontrollers with nanoWatt Technology

PIC18F2450/4450
FIGURE 21-13:
USB SIGNAL TIMING
USB Data Differential Lines
90%
VCRS
10%
TLR, TFR
TLF, TFF
TABLE 21-15: USB LOW-SPEED TIMING REQUIREMENTS
Param
No.
Symbol
Characteristic
Min Typ
TLR
TLF
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 21-16: USB FULL-SPEED REQUIREMENTS
Param
No.
Symbol
Characteristic
Min
TFR
Transition Rise Time
4
TFF
Transition Fall Time
4
TFRFM Rise/Fall Time Matching
90
Typ Max Units
Conditions
—
20
ns CL = 50 pF
—
20
ns CL = 50 pF
— 111.1 %
DS39760A-page 290
Advance Information
© 2006 Microchip Technology Inc.