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USB2240II-AEZG bảng dữ liệu(PDF) 35 Page - Microchip Technology

tên linh kiện USB2240II-AEZG
Giải thích chi tiết về linh kiện  Ultra Fast USB 2.0 Multi-Format, SD/MMC, and MS Flash Media Controllers
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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USB2240II-AEZG bảng dữ liệu(HTML) 35 Page - Microchip Technology

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 2010 - 2015 Microchip Technology Inc.
DS00001979A-page 35
USB224X
10.0
AC SPECIFICATIONS
10.1
Oscillator/Crystal
Parallel Resonant, Fundamental Mode, 24 MHz
± 350 ppm.
TABLE 10-1:
CRYSTAL CIRCUIT LEGEND
Note 10-1
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 10-2, "Capacitance
Formulas". 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 10-2
Each of these capacitance values is typically approximately 18 pF.
FIGURE 10-1:
TYPICAL CRYSTAL CIRCUIT
SYMBOL
DESCRIPTION
IN ACCORDANCE WITH
C0
Crystal shunt capacitance
Crystal manufacturer’s specification (See Note 10-1)
CL
Crystal load capacitance
CB
Total board or trace capacitance
OEM board design
CS
Stray capacitance
MCHP IC and OEM board design
CXTAL
XTAL pin input capacitance
MCHP IC
C1
Load capacitors installed on OEM
board
Calculated values based on Figure 10-2, "Capacitance
Formulas" (See Note 10-2)
C2
FIGURE 10-2:
CAPACITANCE FORMULAS
XTAL1
(CS1 = CB1 + CXTAL1 )
XTAL2
(CS2 = CB2 + CXTAL2 )
C1
C2
CL
1 M
Crystal
C0
C1 = 2 x (CL – C0) – CS1
C2 = 2 x (CL – C0) – CS2



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