Hello guys...I'm making a digital clock using ics 7490, 7447 and seven segment display. It's for my college project.I'm confused actually on how to take a input clock signal in 7490 ic. I've completed the seconds counter portion. But I'm confused about the minutes portion regarding how to take input clock on 7490 ic from output of previous 7490(seconds counter). Could you help me with this? I wanted to know how each output pin of 7490 ic functions and how do we differentiate which output pin is to be used for sending clock to another 7490? Hope you got the question...I've attached the schematic for two second counters and a minute counter below...would appreciate your help..