SN54LS123: How to find the exact value of K for SN54LS123

suleman zafar paracha

Part Number: SN54LS123

Hi. I have a circuit containing SN54LS123 IC. I want to know the output pulse width but unable to figure out the value of K.

The formula is PW = K * R * C

But the thing is the value of K for different capacitor is given in a Plot. I want to know exact value of K for R = 75k and C = 0.022uF.

Thank you

over 4 years ago

0 Dylan Hubbard over 4 years ago

TI__Mastermind 42600 points

Hi Suleman,

If the capacitor value you are using isn't shown in the plots, then this will be something you will have to test. You can measure the pulse width and back calculate to arrive at a K value.

0 suleman zafar paracha over 4 years ago in reply to Dylan Hubbard

Prodigy 110 points

The thing is that I have only schematic and I have to write equivalent in Verilog. If I am not wrong then for SN54LS123 I have to test the R and C combination in physical hardware to find the Pulse Width and reverse it to find the K value. Am I right?

0 Dylan Hubbard over 3 years ago in reply to suleman zafar paracha

TI__Mastermind 42600 points

Hey Suleman,

Yes that is correct.

Logic

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SN54LS123: How to find the exact value of K for SN54LS123