At8xc51snd1c – Rainbow Electronics AT89C51SND1C User Manual
Page 185
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185
AT8xC51SND1C
4109E–8051–06/03
Phase Lock Loop
Schematic
Figure 140. PLL Filter Connection
Parameters
Table 157. PLL Filter Characteristics
V
DD
= 2.7 to 3.3 V, T
A
= -40 to +85
°
C
In System Programming
Schematic
Figure 141. ISP Pull-Down Connection
Parameters
Table 158. ISP Pull-Down Characteristics
V
DD
= 2.7 to 3.3 V, T
A
= -40 to +85
°
C
VSS
FILT
R
C1
C2
VSS
Symbol
Parameter
Min
Typ
Max
Unit
R
Filter Resistor
100
Ω
C1
Filter Capacitance 1
10
nF
C2
Filter Capacitance 2
2.2
nF
VSS
ISP
R
ISP
Symbol
Parameter
Min
Typ
Max
Unit
R
ISP
ISP Pull-Down Resistor
2.2
K
Ω
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