T
treez
Guest
Hi,.
The HC4049 buffer has a transition time of 19ns (at 4v5=vcc) and a propagation delay of 21ns. Does that mean a low to high transition will actually take 40ns?
74HC4049 datasheet
https://www.ti.com/lit/ds/symlink/cd74hc4049.pdf
Also, these timings relate to a 50pF load capacitance…but what if I am cascading them, and I only have therefore 10pF load capacitance…what then are the timings?
The output impedance isnt given, so i cant do an RC delay calculation.
The HC4049 buffer has a transition time of 19ns (at 4v5=vcc) and a propagation delay of 21ns. Does that mean a low to high transition will actually take 40ns?
74HC4049 datasheet
https://www.ti.com/lit/ds/symlink/cd74hc4049.pdf
Also, these timings relate to a 50pF load capacitance…but what if I am cascading them, and I only have therefore 10pF load capacitance…what then are the timings?
The output impedance isnt given, so i cant do an RC delay calculation.