> >suitable candidate, DS1388, with I2C and trickle charge for
> a backup battery.  Unfortunately I can't find a supplier for it 
> >including Maxim

It's on their site

http://www.maxim-ic.com/quick_view2.cfm/qv_pk/3696

Have you requested a couple of samples ? As the DS1388 is a
new device, it may be difficult to get it from anywhere but Maxim
at this stage, unless you indent a quantity. If you can't get samples
(unlikely, as the DS1388 is fairly low-priced), you would be better
to look around for the older models, DS1307 etc and I'm sure
most of the major suppliers (RS, Mouser, Digikey) would have it

The latest newsletter I got from Maxim included - the DS3232,
"World's Most Accurate RTC Integrates TCXO ......". Better
than +/- 1min/year they say

www.maxim-ic.com/ds3232rtc

Also DS3231

www.maxim-ic.com/ds3231rtc

MAX6916/6917, includes uP superviser, SRAM

www.maxim-ic.com/MAX6917rtc

and the DS1388, 512x8 EEPROM (!!!)

There are quite a few alternatives. Maxim list about 20. As
Martin suggested, Philips have devices like the PCF8593

http://www.semiconductors.philips.com/pip/PCF8593P.html

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