The 14SO package is still in production, HEF4011B $0.37 ea from Digikey. You should be able to get a breakout adapter if you need the DIP.
On Mon, Apr 3, 2017 at 7:43 PM, Jeremy Nichols <jn6...@gmail.com> wrote: > I have a new-to-me HP-59309A HP-IB Digital Clock. The clock works on both > the internal crystal oscillator and on an external 10 MHz standard (GPSDO). > However, it counts only to 60 seconds and then repeats without updating the > minutes digit. The TIME SET (FAST and SLOW) push-buttons work but again, > the count will not update minutes and hours, only seconds. The DAY SET > procedure works correctly for days and months. All the other switches and > buttons do what they are supposed to do. Using my 10526T logic pulser I can > force the minutes and hours counters to work. The power supply is in good > condition (after replacement of a few components) and I see no other > problems (yet). > > Tracing the clock signal through the logic circuitry brought me to U3 on > the A4 board. This (U3) is a 4011 quad 2-input NAND gate in a 14-pin DIP > package. It "connects" the seconds counter to the minutes counter and > appears to have failed. One of the people on the email list < > hp_agilent_equipm...@yahoogroups.com> commented that the 4000 series CMOS > chips have a known limited lifetime. Since these parts are no longer in > production, the writer expressed the concern that any parts I might find to > buy may be DOA. > > Before I go hunting for parts, I'd appreciate hearing from anyone in the > group who has experience with the 59309A Clock and/or the 4000-series CMOS > family. In particular, are there modern equivalents to my 4011 chip? If the > 4000's really do have a limited lifetime I'd rather use a substitute. > > Jeremy, N6WFO > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/m > ailman/listinfo/time-nuts > and follow the instructions there. > -- --Jim Harman _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.