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ST72682 Datasheet(PDF) 22 Page - STMicroelectronics

No. de pieza ST72682
Descripción Electrónicos  USB 2.0 high-speed Flash drive controller
PDF  36 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

ST72682 Datasheet(HTML) 22 Page - STMicroelectronics

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Electrical characteristics
ST72682
22/36
7.5
Clock and timing characteristics
Subject to general operating conditions for VDD33, fOSC, and TA.
7.5.1
Crystal oscillator
The Device internal clock is supplied from a crystal oscillator. All the information given in this
paragraph are based on characterization results with specified typical external components.
In the application the load capacitors have to be placed as close as possible to the oscillator
pins in order to minimize output distortion and start-up stabilization time. Refer to the crystal
manufacturer for more details (frequency, package, accuracy...).
Figure 7.
Typical application with a crystal
1.
Depending on the crystal power dissipation, a serial resistor RsOscout may be added. Refer to the crystal
manufacturer for more details.
Table 14.
Clock characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
fOSC
Oscillator frequency
12
MHz
CKACC
Total crystal oscillator
accuracy
Absolute value +
temperature + aging
±60
ppm
α
OSC
Crystal oscillator duty cycle(1)
1.
The crystal oscillator duty cycle has to be adjusted through the two CL capacitors. Refer to the crystal
manufacturer for more details.
45
50
55
%
Table 15.
Typical CL and RS values by crystal
Supplier
Typical Crystal
CL (pF)
RSOSCOUT
(
Ω)
NDK
AT51 or AT41
16
560
OSCOUT
OSCIN
CL
CL
Device
CRYSTAL
RSOSCOUT
(1)
VDDA



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