HEF4521B_09 datasheet(10/17 Pages) NXP

Part #	HEF4521B

Description	24-stage frequency divider and oscillator

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Manufacturer	NXP [NXP Semiconductors]

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10 / 17 page

HEF4521B_5

Product data sheet

Rev. 05 — 5 November 2009

10 of 17

NXP Semiconductors

HEF4521B

24-stage frequency divider and oscillator

14. Application information

(1) Optional for low power operation.

Fig 7.

Crystal oscillator circuit

HEF4521B

Y1

A1

VDD

R(1)

Ro

CS

CT

R(1)

VDD1

VSS

VSS1

MR

A2

Y2

Q18

Q24

1.8 M

Ω

001aae713

Table 11.

Typical characteristics for crystal oscillator

See Figure 7.

Parameter

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

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