HEF4521BPB 查看數據表（PDF） - Philips Electronics

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生产厂家

HEF4521BPB

24-stage frequency divider and oscillator

Philips Electronics 

Philips Semiconductors

24-stage frequency divider and oscillator

Product specification

HEF4521B

MSI

Fig.7 RC oscillator circuit;

f ≈ 2----,--3-----×-----R-1---T---C-----×-----C--- ; RS ≥ 2 RTC, in which:

f in Hz, R in Ω, C in F.

RS

+

RTC

<

V-----I-L----m----a---x

ILI

(maximum input voltage LOW)

(input leakage current)

January 1995

   RTC; C = 1 nF; RS ≈ 2 RTC

 C; RTC = 56 kΩ; RS = 120 kΩ

Fig.8

Oscillator frequency as a

function of RTC and C;

VDD = 10 V; test circuit is

Fig.7.

9

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