what is the difference between 74ls373 & 374 ?

Yep, that's the question. I can read the spec sheet (they are usually on the same sheet) but I don't understand the PRACTICAL difference between the two. Why use 74ls374 instead of a 74ls373????

The 373s outputs will follow the inputs while LE is high.
The 374s outputs will copy the inputs when the clock pin goes high but not while it stays high.

In other words, the 374 is edge triggered the 373 is level triggered.

Mike.

They are very different. The '373 is 'transparent' when the enable is high, in other words it is as if there is nothing at all in the data path when it is operating. So you could use it as a peripheral IO that 'connects' the peripheral when enabled, and 'disconnects' it when it is not. The '374 will only transfer during the rising edge of the enable pulse by 'latching' the input data onto the output.