Counter. Documentation needed .

Hey, I believe how this IC works: Top 2 pins increment and decrement by 1. The left pins are for setting a specific value (so voltage on pins 1, 2, load would output a binary 3 via the right pins). The right pins are binary output, the bottom two are for increasing/decreasing decimal position (basically going from 9 to 10 if another display is attached using another counter and display). Hope that helps a bit :)

Thanks ciaranrh, but i do not see any effect of the left pins.

You seem to understand the up, down, A, B, C, and D pins, so I will skip the description of those. The reset pin will set the 7 segment display to 0 if you apply 5v to the pin. The carry and borrow can be connected to the top of another counter IC to increment or decrement a second counter, allowing you to use multiple seven segment displays if you want to. The pins labeled 1, 2, 4, 8, and load are all used in conjunction. You apply a voltage to any combination of the number pins (ie. 1 and 2 to get 3, 8 and 2 to get 10, etc.) Once you have the voltage applied there, you have to apply voltage to load, and it will load the number you want onto the display. One more note, the bottom right pin on the 7 segment display is not a ground, it is to activate the decimal point on the display itself.