This is a list of parameters for a micro-power MEMS MHz and kHz clock reference. For the SiT8021, a MHz MEMS oscillator, the key take-aways are the 60µA active core current and 0.7µA standby current. The key differentiating features of the SiT1552 are a 32kHz MEMS TCXO, the active current of 1µA and the capability of driving multiple loads.