HEF4753 데이터 시트보기 (PDF) - Philips Electronics

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HEF4753

Universal timer module

Philips Electronics 

Philips Semiconductors

Universal timer module

Product specification

HEF4753B

LSI

6. Frequency recognition mode (LFC = LOW; Y = HIGH; Z = HIGH)

The incoming signal must be symmetrical within the limits as given by the specified delay time in note 2., to achieve lower

or higher frequency detection (see Fig.8).

A B C D E F G H W X LFC Y Z

L H L H HHH H L L L H H

Minimum dividing number is 3.

Fig.8 Timing diagram for frequency recognition mode; tx = time shorter than t3 (OUT = H); ty = time greater than

t3 (OUT = L); for t1, t2 and t3 see Fig.5.

January 1995

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