
22
4109LS–8051–02/08
AT8xC51SND1C
7.2.4
Phase Lock Loop
7.2.4.1
Schematic
Figure 7-5.
PLL Filter Connection
7.2.4.2
Parameters
Table 20. PLL Filter Characteristics
VDD = 2.7 to 3.3 V, TA = -40 to +85°C
7.2.5
USB Connection
7.2.5.1
Schematic
Figure 7-6.
USB Connection
7.2.5.2
Parameters
Table 21. USB Characteristics
VDD = 2.7 to 3.3 V, TA = -40 to +85°C
VSS
FILT
R
C1
C2
VSS
Symbol
Parameter
Min
Typ
Max
Unit
R
Filter Resistor
100
C1
Filter Capacitance 1
10
nF
C2
Filter Capacitance 2
2.2
nF
D+
D-
VBUS
GND
D+
D-
VSS
To Power
RUSB
VDD
Supply
RFS
Symbol
Parameter
Min
Typ
Max
Unit
R
USB
USB Termination Resistor
27
R
FS
USB Full Speed Resistor
1.5
K