[time-nuts] Lucent KS-24361, HP/Symmetricom Z3809A, Z3810A, Z3811A, Z3812...
Hal Murray
hmurray at megapathdsl.net
Sun Nov 2 21:59:06 UTC 2014
kb8tq at n1k.org said:
> The numbers quoted earlier (and they sound right) were 20 uA at 2.5V. That
> would be well under your 100uA. My *guess* is that self discharge / aging on
> a normal AA is going to limit things faster than a 20 uA drain.
20 uA would last 15 years. (assuming no self-discharge)
Self discharge is temperature dependent. Graph here:
http://data.energizer.com/PDFs/alkaline_appman.pdf
(poke the shelf-life button on the left)
At 20C, alkaline lose 20% in 10 years. Or roughly 50 years for the whole
thing. (assuming linear and waving my hands)
> The UT+ data sheet from 1998 quotes an external backup supply of 2.5 to
> 5.35V with a drain of 5uA typical at 2.5 Volts.
Ahhh. That would be 60 years. (assuming no self-discharge) So it's roughly
matching the self discharge rate.
kb8tq at n1k.org said:
> Your pair of AAâs will start off at 3.1V, but they will get to 2.5 long
> before they are truly dead. Is the RAM gone at 2.5000 or 2.4 or âabout 2
> voltsâ â¦.
The usual cutoff is 0.8 V. It falls off quickly at the end. It's still 50%
at 1.25 V. There is a graph at the above URL.
--
These are my opinions. I hate spam.
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