what does edge rate actually indicates? does it indicate that what should be the the maximum frequency at which its input should change so that ic can properly sample it.if i have a controller with instruction rate of 8MHz i.e. 125nS per instruction and it is connected to another ic with rise time of 25nS/V ,so whatever data i will send to that ic from controller should remain stable for al least 125nS because for ic it will take 125 nS to rise the input from 0 to 5V.but controller may send another data to ic after 125nS(instruction cycle).so in this case will that ic be able to sample previous data? or i have to consider another ic with low edge rate?