1. A system employing dynamic storage of information, the system comprising: a. a dynamic memory, powered by a power signal, for retaining and providing the information, the memory characterized by a retention time, the retention time being responsive to the power signal; b. means for refreshing the memory; and c. timing means comprising a first device characterized by a resistance responsive to the power signal, the timing means for controlling the means for refreshing, according to a period, in response to a current through the first device, so that the memory is refreshed prior to passage of the retention time, thereby maintaining the information.