Logic IC inputs have high impedances and unused inputs must be connected to 0V or +Vs The 74LS and 74HCT families require a 5V supply so they are not convenient for battery operation. The tables show the supply voltage and maximum output current for each family. Logic ICs can be split into two groups: the 4000 series, and theħ4 series which consists of various families such as the 74HC, 74HCT and 74LS.įor most new projects the 74HC family is the best choice. Shift registers, counters and display drivers. Many devices, including logic gates, flip-flops, Logic ICs process digital signals and there are
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