PIC16C745/765
FIGURE 16-14: MAXIMUM INPUT WAVEFORM TIMING SPECIFICATIONS
66.7ns
RSRC
6MHz
60ns
min
Pin
V
4.6V
-1.0V
RSRC = 39Ω ± 2%
4ns
min
4ns
min
20ns
max
20ns
max
Note 1: The D+/D- signals can withstand a continuous short to VBUS, GND, cable shield or any other signal.
FIGURE 16-15: USB LOW SPEED SIGNALING
Data Differential Lines
90%
90%
72
10%
10%
71
70
TABLE 16-12: USB AC AND DC SPECIFICATIONS
Parameter Sym
No.
Characteristic
Min TYP† Max
Units Conditions
70
TLR
Transition Rise Time
75
75
1.3
80
300
300
2.0
ns
ns
V
71
72
TLF
Transition Fall Time
VCRS
TLRFM
VIL
Crossover Voltage
Rise and Fall Time Matching
Voltage Input Low
125
0.8
%
V
VIH
Voltage Input High
2.0
2.7
0.2
0.8
0.0
2.8
2.7
V
VIHZ
Voltage Input High Floating
Differential Input Sensitivity
Differential Common Mode Range
Voltage Output Low
3.6
V
V
V
V
V
V
(D+)-(D-)
2.5
0.3
3.6
3.6
VOL
VOH
VUSB
Voltage Output High
USB Voltage Output
DS41124A-page 140
Advanced Information
1999 Microchip Technology Inc.
MICROCHIP [ MICROCHIP ]
