The present IP specifies a Ring Oscillator with 1.8V power supply and less than 50uA operating current. Its output frequency is 8MHz and it can be fairly accurate (±5%) by tuning 5 signal bits.
The present IP is a ring oscillator to generate 125KHz±6% clock. Its power supply is 1.6V~3.63V. Its typical operating current is 2.1uA.