I am working on an industrial logic rack (a predecessor to the PLC). One of the logic boards has a 5 input NAND gate. On the schematic for the gate it shows a typical NAND gate with 5 inputs, but it also has an input that goes into the side of the gate. The chip was made by Teledyne in the late 60's or early 70's. Teledyne does not have a data sheet for it, it is too old. I have never run into a gate like this, does any one know what this gate is?

Thank you.

 

Does the part have a part number?

Harry

 

If the number is in the 800's, then it's DTL and the extra input is probably a strobe.

Hope you don't need a replacement.

 

I remember messing with RTL at the beginning of my career. Was it in a circular package?

 

Yep, that would be RTL if it's in a TO-5 can - or it could just be ECL100. I recall that packaged in TO-5. In that case, the extra line would be the compliment output.

 

The part number is a 303CL and it is a 16 pin DIP.

Thank you