I'm looking for a one shot timer with a long delay (~4 hours). I've been looking at the CD4541B. To use this chip I need to set the frequency to about 4.5Hz. The equation for setting the frequency in the datasheet is declared for f between 1kHz and 100kHz, however the datasheet also says it can operate down to DC? How does the frequency equation (f = 1/(2.3 x Rtc x Ctc) change for low frequencies? I assume the k value will drift somewhat.
I've also been looking at the TPL5110. What are the limitations and availability for this part?
