7432 is a voltage controlled device. The key parameters are Vih (HIGH Level Input Voltage), Vil (LOW Level Input Voltage), Voh (HIGH Level Output Voltage), and Vol (LOW Level Output Voltage). Vih is 2V (minimum value) and Vil is 0.8V (maximum value). An unconnected input (floating input) is considered HIGH (logical "1"). In this circuit a LED light that connects to pin 3 lights up when pin 1 and pin 3 TTL inputs are left floating. The typical supply voltage for 7432 is 5V. 7805 ic is used to turn down the voltage level from the 6V battery.
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