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74LS74 Frequency Divider

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crankler

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i will be using adc0809 analog-to-digital converter. it needs an external clock and i saw this pic from crankshaft:
View attachment adc setup.bmp
the microcontroller's oscillator can provide the adc clock but it needs to be divided by four 74ls74. i was just confused with the connection because the ic have a lot of pins:
View attachment 74ls74.bmp
in this specific application, what should i do with the CLR and PR pins? should i leave them alone or connect it to the +5V or ground?
 

The preset & clear pins should be high (5V) if you don't need them. However, as mentioned by DineshSL, if you just need a divider there are simpler chips e.g. 74HC4024.

Keith.
 
honestly, i don't understand the datasheet because i'm not familiar with flip flops and i still don't understand how it divides the frequency.
so i'll just connect the PR and CLR pins to 5v... let's see if it works fine
 

Hi crankler,

If so, spend little time to read on flip-flops and do some experiments with your 74ls74; that is how all learn.

Thanks,
 

i'm using clock in ADC0804 through frequency divider using 74ls74.
is there any use of CLK R pin if i'm using the above frequency????????


can anybody give me ass. programm for ADC0804 interfaced to 89s52??????????/
 

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