Did you know that TTL chips do not output 5 volts? 74LS, 74HC, and 74HCT all have different input and output thresholds. Switching between logic families can be difficult if you are not careful. In this video, learn how different 7400-series logic families compare with input threshold, output voltage, frequency, rise time, and propagation delay. Check out this TI Application Guide for a great resource on logic families.

These days it is pretty rare to see a press release from a semiconductor company touting 5V TTL capabilities.  Diodes is upgrading their 5V TTL logic as reported by Electronics Weekly.  While the 5V operating will easily appeal to hobbyist, the package sizes may not.  They are not through-hole components.  However, the 74ACHT series will provide you surface mount solutions for AND, NAND, OR, NOR, XOR, Inverter, and Schmitt trigger glue logic. Diodes can be found…