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Original question:

SN74LVC1G123: pulse transition timing of INPUT pins

SN74LVC1G123: pulse width variation over temp

Aaron Spaete
Expert 4527 points
Part Number: SN74LVC1G123

Team,

My customer is looking at using the SN74LVC1G123 (multivibrator) in a ~200-300 ns pulse width application.  

    • Figure 4 indicates that RL of 1k and Cext of 100pF could yield about the correct pulse width.
    • However, Figure 6 suggests that capacitances below 100pF, while probably still functional, could create a lot of variation in output pulse width.

Retrigger time would not be an issue in this application.

 

Can this part reliably create a pulse width that narrow? How much could the pulse width be expected to vary over temperature (-40 to +85C)?  

Regards,

Aaron

  • 0
    TI__Genius 16735 points
    Hello Aaron,

    This device is quite accurate actually. Here is an appnote that talks about designing with this part and its accuracy over temperature. www.ti.com/.../slva720.pdf
    The real restriction over temperature you would have is the accuracy of your external components. The capacitor value for example will change over temperature causing the pulse width to change.

    Thanks!
    - Karan