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STA1085 Folha de dados(PDF) 62 Page - STMicroelectronics

Nome de Peças STA1085
Descrição Electrónicos  Accordo2 family – Automotive dual core processor for car radio and display audio application
PDF  127 Pages
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Fabricante Electrônico  STMICROELECTRONICS [STMicroelectronics]
Página de início  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STA1085 Folha de dados(HTML) 62 Page - STMicroelectronics

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Electrical Characteristics
STA108x, STA109x
62/127
DS13319 Rev 2
The 24 to 26 MHz oscillator is connected between MXTALI (oscillator amplifier input) and
MXTALO (oscillator amplifier output). It also requires two external load capacitors of CL pF,
as shown in Figure 5.
The specifications of a typical external crystal are shown in Table 27:
Figure 5. 24-26 MHz Crystal Connection
To drive the 24/26 MHz crystal pins from an external clock source:
–
Force Through Mode. Bias MXTALO at 1.25 V. Apply external single ended
square clock at MXTALI. Input clock should be of CMOS level (Low = GND,
High = 2.5 V). Clock is available after OSC startup time.
Table 27. Typical Crystal Recommended Specifications
Symbol
Parameter
Limit values
Unit
Min
Typ
Max
FMXTAL
SR Crystal Frequency
-
24
-
MHz
LMMXTAL, 24MHz XTAL
-
4.0
-
mH
CMMXTAL, 24MHz XTAL
-
10.1
-
fF
RMMXTAL
Motional Resistance
-
20
-
COMXTAL
Shunt Capacitance
-
-
4.0
pF
CLMXTAL
Load Capacitance(1)
--
30
pF
1. Total capacitance, including package and board parasitics.
CL
CL
24-26 MHz
Crystal
MXTALI
MXTALO
Device
LMMXTAL RMMXTAL CMMXTAL
COMXTAL
Crystal Model



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