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USB82642 датащи(PDF) 48 Page - Microchip Technology

номер детали USB82642
подробное описание детали  Automotive USB 2.0 Hub and Flash Media Card Controller Combo
PDF  64 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

USB82642 датащи(HTML) 48 Page - Microchip Technology

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USB82642
DS60001253F-page 48
2012-2021 Microchip Technology Inc.
9.0
AC SPECIFICATIONS
9.1
Oscillator/Clock
Parallel Resonant, Fundamental Mode, 24 MHz
350 ppm.
TABLE 9-1:
CRYSTAL CIRCUIT LEGEND
Note 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, "Capacitance Formulas". However,
the OEM PCB itself may present a parasitic capacitance between XTAL1 and XTAL2. For an accurate cal-
culation of C1 and C2, take the parasitic capacitance between traces XTAL1 and XTAL2 into account.
Note 2: Each of these capacitance values is typically approximately 18 pF.
FIGURE 9-1:
TYPICAL CRYSTAL CIRCUIT
Symbol
Description
In Accordance With
C0
Crystal shunt capacitance
Crystal manufacturer’s specification (see Note 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, "Capacitance
Formulas" (see Note 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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