11/30/2004 section 5_3 The BJT as an Amp and Switch.doc 2/2 Jim Stiles The Univ. of Kansas Dept. of EECS Back in my day (a long time ago!) TTL was much faster than CMOS, thus TTL was prevalent. Now, CMOS (in addition to all of its other ideal characteristics) is faster than TTL, thus TTL is basically obsolete.