Working on legacy product using CD4000 series logic.
Cannot find links to the National Semi App Notes on CMOS logic family characteristics
AN-77, CMOS The Ideal Logic Family
AN-88, CMOS Linear Applications
If not available can provide link for these App Notes can provide TI equivalent?
Have not worked with CD4000 series before and this design is based on asynchronous combinatorial logic.
One spec that seems to be missing is the Tr and Tf of input signals.
Later generation CMOS families, 74HCT, 74ACT, include this specification.
Is the input rise and fall time not critical for CMOS CD4000 series?
