Series connection of multiple digital devices to a single power source

A digital processor system connected between a first power supply node and a second power supply node, comprising:

• a first processor having a first supply terminal and a second supply terminal, said first supply terminal of said first processor being connected to the first supply node;
• a second processor having a first supply terminal and a second supply terminal, said first supply terminal of said second processor being connected to said second supply terminal of said first processor at an intermediate supply node and said second supply terminal of said second processor being connected to the second supply node, such that said first processor and said second processor are connected in series between the first supply node and the second supply node;
• and
• processing rate control means responsive to a predetermined reference voltage and a voltage at said intermediate supply node for controlling a processing rate of said second processor to maintain said voltage at said intermediate supply node close to said predetermined reference voltage.