A high channel count high-voltage neural stimulator provides an external circuit which communicates power and data to a neural stimulator implant circuit. Data from the external device, such as image data from a camera in an epiretinal application, are communicated to the implant. Multiple pixels circuits, within each implant demultiplex the digital signals, then output separate nerve stimulator outputs from multiple outputs, each configured for connection to a nerve, by sharing a single level conversion driver circuit. In at least one example, the implant circuits can be clustered in a master-slave configuration to increase the number of available neural stimulation outputs.