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HCF4521 Datasheet(PDF) 8 Page - STMicroelectronics

Part # HCF4521
Description  24 STAGE FREQUENCY DIVIDER
PDF  12 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

HCF4521 Datasheet(HTML) 8 Page - STMicroelectronics

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Crystal Oscillator Circuit
TYPICAL DATA FOR CRYSTAL OSCILLATOR CIRCUIT
Characteri stic
500 kHz
CIRCUIT
50 kHz CI RCUIT
Un it
Crystal Characteristics
Resonant Frequency
Equivalent Reistance, RS
500
1
50
6.2
kHz
k
Ω
External Resistor/Capacitor Values
RO
CT
CS
47
82
20
750
82
20
k
Ω
pF
pF
Frequency Stability
Frequency Change as a Function of VDD (TA =25
oC)
VDD Change from 5V to 10V
VDD Change from 10V to 15V
Frequency Change as a Function of Temperature (VDD =10 V)
TA Change from -55
oCto 25 oC
HCF4521B only
Complete Oscillator *
TA Change from 25
oCto 125 oC
HCF4521B only
Complete Oscillator *
6
2
-4
100
-2
-160
2
2
-2
120
-2
-560
ppm
ppm
ppm
ppm
ppm
ppm
* Complete oscillator includes crystal, capacitors and resistors.
* Optional for low power operation.
HCF4521
8/12



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