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An I/sup 2/L watch chip with direct LED drive

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2 Author(s)

A three function watch circuit using I/SUP 2/L technology has been fabricated on a chip measuring 86 mils/spl times/96 mils. The circuit draws 7-10 /spl mu/A in the run mode and has on-chip segment and digit drivers which are capable of sourcing 15 mA and sinking up to 70 mA, respectively. The low frequency (<1 kHz) transistors in this circuit operate with 5-10 nA base current. A unique four-base divide-by-two circuit, using current starving to implement delays, is the building block for the circuit and its small size (13 mil/SUP 2/) contributes to the small chip size. Segment and digit drivers which draw only 50 nA each in the run mode (no display) also contribute to the low chip current.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:11 ,  Issue: 6 )