Power supply device of a programmable circuit

The attachment has a generation unit (50) for generating a supply signal (V1) from a main supply signal (V0). A control unit (20) is arranged for the connecting the supply signal to an electronic circuit or a storage unit (11) such as RAM, when a control signal (5V MEMO) coming from a cut-off sensing device (12) presents a state representative of the main supply signal. The control unit does not connect the supply signal to the electronic circuit when the control signal presents another state that is representative of absence of the main supply signal. An independent claim is also included for an electrical domestic appliance.