HCF4521 查看數據表（PDF） - STMicroelectronics

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HCF4521

24 STAGE FREQUENCY DIVIDER

STMicroelectronics 

HCF4521

TYPICAL DATA FOR CRYSTAL OSCILLATOR CIRCUIT

C h ara cteri st i c

Crystal Characteristics

Resonant Frequency

Equivalent Reistance, RS

External Resistor/Capacitor Values

RO

CT

CS

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 oC to 25 oC

HCF4521B only

Complete Oscillator *

TA Change from 25 oC to 125 oC

HCF4521B only

Complete Oscillator *

* Complete oscillator includes crystal, capacitors and resistors.

Crystal Oscillator Circuit

500 kHz

CIRCUIT

500

1

47

82

20

6

2

-4

100

-2

-160

50 kHz CIRCUIT Un it

50

kHz

6.2

kΩ

750

kΩ

82

pF

20

pF

2

ppm

2

ppm

-2

ppm

120

ppm

-2

ppm

-560

ppm

* Optional forlow power operation.

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