mating logic families - it was all very easy when there was only TTL

mating logic families elektor february 1984 Connecting digital ICs within the same logic family will rarely cause any problems, as long as such things as fan-out and parasitic line and input capacitance are taken into account. It is quite a different matter, however, to try to use the different logic families, TTL (standard, LS and ALS) and CMOS, together. There is a great temptation to do just this as the possibilities for combinations becomes even greater with logic families continually being expanded. The new family of high speed CMOS (HCMOS) recently released onto the market prompts even more questions about the compatibility of its two variations with existing logic circuits. Maybe a lot of problems wilt be solved if we simply answer the question "How digital is digital?". mating logic families it was all very easy when there was only TTL The popularity of digital electronics is very easy to understand. What could be simpler than a system in which there are only two values, "...