I’m new to ECL and not seeing output pulses at U15-19 (expecting 925.926 kHz) or at the U16 and U17 outputs. Do I have suitable resistors at pin 27 and P0..P7? (U23 is ECS-3951M-1000-BN-TR.)
View attachment 184364

 

Check the pin 26(MR) first, if it is about 3.3V(or a high level) then you have to make a CR power reset circuit to MR. (MR should be a high level pulse)

What's the purpose of H,L and what are they? (are they just the labels?)

 

I’m new to ECL and not seeing output pulses at U15-19 (expecting 925.926 kHz) or at the U16 and U17 outputs. Do I have suitable resistors at pin 27 and P0..P7? (U23 is ECS-3951M-1000-BN-TR.)
View attachment 184364

You don't want to use the TC output as a clock input
it glitches, you need to use t as an enable

Also
ECL is not push pull, you need resistor to a Vtt , else you will get no outputs,

 

https://www.onsemi.com/pub/Collateral/AND8020-D.PDF

 

Check the pin 26(MR) first, if it is about 3.3V(or a high level) then you have to make a CR power reset circuit to MR. (MR should be a high level pulse)

What's the purpose of H,L and what are they? (are they just the labels?)

Thank you Scott, I followed your suggestions. Pin 26 measured 3.137 V. I pulsed MR high with no change in behavior. H and L are just labels.

 

You don't want to use the TC output as a clock input
it glitches, you need to use t as an enable

Also
ECL is not push pull, you need resistor to a Vtt , else you will get no outputs,

It looks like I overlooked Vtt here and will follow that up. Please clarify your suggestion to use t as an enable? Thanks for your help Andrew.

 

Thank you Scott, I followed your suggestions. Pin 26 measured 3.137 V. I pulsed MR high with no change in behavior. H and L are just labels.

The MR pin is used to accept a high pulse and stay on low level voltage as GND, normally it is active a high level voltage at the power up or what time that you want to clear all output pins Q0~Q7 , since you already used the PE function then try to connects the MR pin to Ground.