A stochastic beating time-to-digital converter (TDC) can include triggered ring oscillator (TRO) and a stochastic TDC (sTDC). The TRO, when triggered by a reference signal edge, can generate a periodic TRO signal with a TRO period that is a selected ratio of a voltage-controlled oscillator (VCO) period. The TRO period can be greater than or less than the VCO period by the specified ratio. The sTDC with an event triggered memory can include an sTDC component with a plurality of groups of latches. Each group of latches can be configured to sample and store a VCO state at an edge of a TRO signal. The sTDC component can trigger a capture of a select number of VCO states of the group of latches when one latch in the group of latches transitions to a different digital state referred to as a transition edge.