The 74×83 (ex 74LS83) is a chip with 4-bit binary full adder with fast carry.

The 74HC83 comes in a 16-pin package, and you need to connect it to power before you can use it. Most 7400 ICs support a VCC voltage of 5V. One difference between the HC and LS version of the chip is that the 74HC83 supports 2V to 6V, while the 74LS83 only supports 5V.

The maximum current you can pull out of one output pin on the 74HC83 chip is 4 mA. For the 74LS83 chip it’s 0.4 mA when the pin is high (sourcing) or 8 mA when the pin is low (sinking). This can differ between models, so check the datasheet of your model to verify.