Hi everyone!
I have a problem in understanding pins operation in 74HC299 device.
I have attached it here, I'm confused in the datasheet there is a MODE SELECT TABLE, and it is written that If we have a LOW signal on S0 and S1 pins its operation will be : Hold ( is this meaning that it would save digital data on input pins ? I/On ?? )
and a HIGH signal on S0 and S1 will operate as: parallel load ( is this meaning that the saved data in the past mission will be apear ion I/On S pins?? ) and at last what about OE pins? what do they do exactly??
I hope you get my mean right
I have attached the datesheet , please read it
thank you
Eric

 

On 00 Select, the output will hold and won't change its value regardless of its input.
On 11 Select, the output will load the input in the next cycle, not asynchronously.

Any HIGH input on the OE pins will disengage the output from its bus and it will present HIGH IMPEDANCE on its output.
The same thing will happen on LOAD too.

 

thank you buddy, I will try to do it

 

It's all on the datasheet. You could have read that yourself instead of me.