> > The CD4068 (from TI) seems to have both AND and NAND outputs ... > > Ahh - TI ! ST Microelectronics HCF4068B too... http://www.st.com/stonline/books/pdf/docs/2059.pdf Tim __________________________________________________________ Tim Stinchcombe Cheltenham, Glos, UK email: tim101 at tstinchcombe.freeserve.co.uk