slewissj@cc.curtin.edu.au (Stephen J Lewis) (06/07/91)
Hi All, I am in desperate need of an accurate Real Time Clock for a project I am working on. It needs to be accurate to within 1 second a day, and I can't seem to find any crystals or oscillators that are accurate enough to run any standard RTCs, so I am looking for an RTC that has an onboard oscillator (accurate to within 1 sec/day), can be easily accessed on a microprocessor bus as well as be easily battery backed up. I don't ask for much! If anyone can help me I would greatly appreciate it. Thanks In Advance Steve. -- Disclame:- I take no responsibility for anything! That includes my spelling! *-------+---------+---------+---------+---------+---------+---------+-------* Internet: SLEWISSJ@cc.curtin.edu.au I Stephen J Lewis Bitnet: SLEWISSJ%cc.curtin.edu.au@cunyvm.bitnet I Curtin University Of Tech UUCP: uunet!munnari.oz!cc.curtin.edu.au!SLEWISSJ I Western Australia I Australia *-------+---------+---------+---------+---------+---------+---------+-------*
rogerm@hpfcso.FC.HP.COM (Roger Mitchell) (06/08/91)
Try the Epson RTC-58321 chip. It has a built in crystal and is accurate to less than 1 minute per year. Roger M N0MCR
nickolas@cpsc.ucalgary.ca (Nickolas Chondropoulos) (06/08/91)
I'm not sure if this would do the trick but look into the DS1216E by Dallas Semiconductor. It is a 28 pin Smartwatch and can sit under any ROM on the bus. It is accurate to 1 sec/month, good for a century and has a lithium battey built in that lasts for 10 years. Usual price up here in Calgary is ~$35.00 CAN. Nick.
hamid@uop.uop.edu (Mohd H Misnan) (06/08/91)
rogerm@hpfcso.FC.HP.COM (Roger Mitchell) writes: >Try the Epson RTC-58321 chip. It has a built in crystal and is accurate to >less than 1 minute per year. > Roger M > N0MCR Does anybody know where can I find the schematic diagram for RTC-58321? I've the chip but don't have the schematic diagram. Thanks for any help. -mid- -- *-------------------------*----------------------------------------* | Mohd H Misnan | INET: hmisnan@madvax.uop.edu | | Univ. of The Pacific | akar%mhm@uop.edu | | Stockton, CA 95204 | an605@po.cwru.edu | | U.S.A | UUCP: uunet!uop!mhm!akar | | | GENIE: M.MISNAN | *-------------------------*----------------------------------------*