Ed I do not have data on a 5315 In a message dated 9/27/2011 9:10:25 P.M. Eastern Standard Time, [email protected] writes:
Sorry Ed you are wrong. Hp generates a 65 Hz signal that advances the internal prescaler 49 counts and uses the 1 pps output to stop the 65 Hz output at count 49 and waits for the internal 1 pps to go to 50 and advance the second digit one count. Sounds crazy but it works, makes the clock advance in perfect sync with the internal second generator. Bert Kehren In a message dated 9/27/2011 8:16:43 P.M. Eastern Standard Time, [email protected] writes: The original clock IC is probably OK - I needed to ID it to figure out how to modify the circuit for new power and interface. I have a couple of (probably OK) pulled MM5315s also, which could sub with a slight pinout rearrangement if needed. After looking at the manual, I realized that I did look at this series of parts way back, but didn't get the connection because I thought it would have to be a type that takes 1 Hz input rather than 50/60 Hz. I see now that they were used in the "set" mode, bypassing the internal divide by 50/60. The clock module I have is the type with a 555 used as a one-shot for normal operation, or as an oscillator for fast setting. I think this is probably the newer of the designs, since it is simpler. Ed _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
