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USB2642 датащи(PDF) 46 Page - Microchip Technology

номер детали USB2642
подробное описание детали  USB 2.0 Hub and Flash Media Card Controller Combo
PDF  56 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB2642 датащи(HTML) 46 Page - Microchip Technology

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2014-2015 Microchip Technology Inc.
DS00001578C-page 47
USB2642
9.0
AC SPECIFICATIONS
9.1
Oscillator/Crystal
Parallel Resonant, Fundamental Mode, 24 MHz
± 350 ppm.
Note 9-1
C0 is usually included (subtracted by the crystal manufacturer) in the specification for CL and should
be set to ‘0’ for use in the calculation of the capacitance formulas in Figure 9-2. However, the OEM
PCB itself may present a parasitic capacitance between XTAL1 and XTAL2. For an accurate
calculation of C1 and C2, take the parasitic capacitance between traces XTAL1 and XTAL2 into
account.
Note 9-2
Each of these capacitance values is typically approximately 18 pF.
FIGURE 9-1:
TYPICAL CRYSTAL CIRCUIT
TABLE 9-1:
CRYSTAL CIRCUIT LEGEND
Symbol
Description
In Accordance with
C0
Crystal shunt capacitance
Crystal manufacturer’s specification (see
Note 9-1)
CL
Crystal load capacitance
CB
Total board or trace capacitance
OEM board design
CS
Stray capacitance
Microchip IC and OEM board design
CXTAL
XTAL pin input capacitance
Microchip IC
C1
Load capacitors installed on OEM board
Calculated values based on Figure 9-2 (see
Note 9-2)
C2
FIGURE 9-2:
CAPACITANCE FORMULAS
C 1 = 2 x ( C L – C 0 ) – C S1
C 2 = 2 x ( C L – C 0 ) – C S2



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