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| 型號(hào)： | VDP3108PR |
| 英文描述： | Consumer IC |
| 中文描述： | 消費(fèi)性IC |
| 文件頁(yè)數(shù)： | 55/72頁(yè) |
| 文件大小： | 597K |
| 代理商： | VDP3108PR |
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PRELIMINARY DATA SHEET
VDP 31xxB
55
Micronas
Recommended Crystal Characteristics,
continued
Symbol
Parameter
Min.
Typ.
Max.
Unit
Load Capacitance Recommendation
C
Lext
External Load Capacitance
1)
from pins to Ground
(pin names: Xtal1 Xtal2)
–
3.3
–
pF
DCO Characteristics
2)
C
ICLoadmin
Effective Load Capacitance @ min.
DCO-Position, Code 0,
3.6
4.3
5
pF
C
ICLoadrng
Effective Load Capacitance Range,
DCO Codes from 0..255
11.7
12.7
13.7
pF
1)
Remarks on defining the External Load Capacitance:
External capacitors at each crystal pin to ground are required. They are necessary to tune the effective load capacitance of
the PCBs to the required load capacitance C
L
of the crystal. The higher the capacitors, the lower the clock frequency re-
sults. The nominal free running frequency should match f
p
MHz. Due to different layouts of customer PCBs the matching
capacitor size should be determined in the application. The suggested value is a figure based on experience with various
PCB layouts.
Tuning condition: Code DVCO Register =
–
720
Tuning condition: Code DVCO Register
2)
Remarks on Pulling Range of DCO:
The pulling range of the DCO is a function of the used crystal and effective load capacitance of the IC (C
ICLoad
+C
LoadBoard
).
The resulting frequency f
L
with an effective load capacitance of C
Leff
= C
ICLoad
+ C
LoadBoard
is
1 + 0.5 * [ C
1
/ (C
0
+ C
Leff
) ]
f
L
= f
P
*
–––––––––––––––––––––––
1 + 0.5 * [ C
1
/ (C
0
+ C
L
) ]
4.6.4. Characteristics
at T
A
= 0 to 65
°
C, V
SUPD/F/O
= 4.75 to 5.25 V,
f = 20.25 MHz for min./max. values
at T
C
= 60
°
C, V
SUPD/F/O
= 5 V, f = 20.25 MHz for typical values
Symbol
Parameter
Pin Name
Min.
Typ.
Max.
Unit
I
VSUPF
Current Consumption
V
SUPF
–
38
–
mA
I
VSUPD
Current Consumption
V
SUPD
–
123
–
mA
I
VSUPO
Current Consumption
V
SUPO
–
64
–
mA
I
VSTDBY
Current Consumption
V
STDBY
–
3.3
–
mA
P
TOT
Total Power Dissipation
–
1145
1200
W
IL
Input / Output Leakage Current
All I/O Pins
–
1
–
1
A
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