BTW, we are talking digital clock? I'm assuming given his dismay at finding a single-chip circuit.
That is, the analog wall-clocks I've seen use a gear mechanism to cascade the second-hand movement to the minute and hour hands. So all you provide is a 1 pulse-per-second signal (derived from a 32.768 kHz crystal for battery-power, or from 60 Hz if line-powered) to drive the second-hand movement and you're done. I don't think you'd ever need more than 1 chip to do so.
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