Need a chip with a frequency that can be set with an R and/or C that is easy to use to produce an oscillator

Hi,  I need a chip that is easy to use with a frequency that can be set with an R and/or C to produce an output sequence of 1 0 1 0 1 0......., essentially an oscillator or clock.  It needs to be able to operate at fairly low, power system speeds.

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