HEF4521B datasheet(9/11 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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9 / 11 page

January 1995

9

Philips Semiconductors

Product speciﬁcation

24-stage frequency divider and oscillator

HEF4521B

MSI

Fig.7

RC oscillator circuit;

f in Hz, R in

Ω, C in F.

f

1

2,3

R

TC

C

×

------------------------------------

;R

S

2R

TC i n which:

,

≥

≈

R

S

R

TC

V

IL max

I

LI

------------------

<

+

maximum input voltage LOW

()

input leakage current

()

Fig.8

Oscillator frequency as a

function of RTC and C;

VDD = 10 V; test circuit is

Fig.7.

 RTC; C = 1 nF; RS ≈ 2 RTC

 C; RTC = 56 kΩ; RS = 120 kΩ

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