CS5535-UDCF AMD (ADVANCED MICRO DEVICES), CS5535-UDCF Datasheet - Page 158

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CS5535-UDCF

Manufacturer Part Number
CS5535-UDCF
Description
Manufacturer
AMD (ADVANCED MICRO DEVICES)
Datasheet

Specifications of CS5535-UDCF

Operating Temperature (min)
0C
Operating Temperature (max)
85C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant

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Quantity
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5.14.1
It is recommended that the external components for the
oscillator be connected as illustrated in Figure 5-48. The
recommended specifications for those external compo-
nents are listed in Table 5-29.
Capacitors C1 and C2 should be chosen to match the crys-
tal’s load capacitance. The load capacitance C
the crystal Y is comprised of C1 in series with C2 in parallel
with the parasitic capacitance of the circuit. The parasitic
capacitance is caused by the chip package, board layout,
and socket (if any). The rule of thumb in choosing these
capacitors is:
C1 can be trimmed to achieve precisely 32.768 kHz. To
achieve high time accuracy, use crystal and capacitors with
low tolerance and temperature coefficients.
Note 1. A single 20 MΩ resistor may be difficult to acquire. Substituting two 10 MΩ resistors in series is acceptable.
158
Component
Crystal
Resistor, R1
Capacitor, C1
Capacitor, C2
C
External Use Recommendations
L
= (C1 * C2)/(C1 + C2) + C
31506B
Table 5-29. External Component Recommended Specifications
Parameters
Resonance
Type
Serial Resistance
Q Factor
Shunt Capacitance
Load Capacitance, C
Temperature Coefficient
Resistor
Capacitor
Capacitor
PARASITIC
L
“seen” by
L
Values
32.768 kHz Parallel Mode
N-Cut or XY-bar
40 kΩ
35000
2 pF
9-13 pF
User-defined
20 MΩ (Note 1)
22 pF
22 pF
Figure 5-48. Recommended External Component
KHZ32_XCI
C1
AMD Geode™ CS5535 Companion Device Data Book
R1
Y
Connections
Tolerance
User-defined
Max
Min
Max
5%
5%
5%
KHZ32_XCO
Real-Time Clock Features
C2
To other modules
External
Internal

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