Hello
In the datasheet, there is the delay data from input to output, the data is for different channels of one part, or it is for different parts? thanks
Regards,
Nanfang
Nanfang,
The datasheet parameter that you are referring to [Propagation Delay] provides coverage of all parts across PVT (Process, Voltage, and Temperature).
For example, take the specific case highlighted below.
This means that with VCCA = 3.3V, VCCB = 2.5V, and signal direction from Port A to Port B, the worst case delay from an 'A' pin to a 'B' pin that you could observe on any unit is 3.2 ns.
The difference in delay between the individual channels on an individual part (e.g. Difference between 1A1 to 1B1, 1A2 to 1B2,.....,1A8 to 1B8 on a selected unit) is referred to as channel-to-channel skew or output skew. This is not covered as a datasheet parameter in our translators.
However we have a guarantee for all of our logic devices to limit output skew to 1ns. Keep in mind that this applies to a single unit with all driving inputs connected together and the outputs switching in the same direction while driving identical specified loads.
Here is the what to expect for typical max skew based on technology. These are not guaranteed though:
- TTL = 800ps
- Bicmos = 500ps
- CMOS is 250ps
AVC and LVC devices are CMOS
Best Regards,
Nirav
