HEF4521B datasheet(8/11 Pages) PHILIPS

Part #	HEF4521B

Description	24-stage frequency divider and oscillator

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Manufacturer	PHILIPS [NXP Semiconductors]

Direct Link	http://www.nxp.com

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8 / 11 page

January 1995

8

Philips Semiconductors

Product speciﬁcation

24-stage frequency divider and oscillator

HEF4521B

MSI

APPLICATION INFORMATION

Typical characteristics for crystal oscillator circuit (Fig.6):

500 kHz

CIRCUIT

50 kHz

CIRCUIT

UNIT

Crystal characteristics

resonance frequency

500

50

kHz

crystal cut

S

N

−

equivalent resistance; RS

1

6,2

k

Ω

External resistor/capacitor values

Ro

47

750

k

Ω

CT

82

pF

CS

20

pF

Fig.6 Crystal oscillator circuit.

(1) Optional for low power operation.

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HEF4521B Datasheet(PDF) 8 Page - NXP Semiconductors

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