Patent ID: 6288603
Filing Date: 2001-09-11
Classification: G11C,H03K

Abstract:
A high voltage bidirectional switch comprising:a pass gate having a control terminal;a first line at a first reference potential;a second line at a second reference potential;a first MOS switch connected between said first line at said first reference potential and said control terminal, and having a control terminal of its own connected to a first node and receiving a control voltage, said first MOS switch being closed in the presence of a first value and open in the presence of a second value of said control voltage;a second MOS switch connected between said second line at said second reference potential and said control e and having a control terminal of its own;a first memory circuit having an activation input, and an output connected to said first node, said memory circuit generating said first value of said control voltage;a second memory circuit having an activation input, and an output connected to said first node, said second memory circuit generating said second value of sad control voltage; anda control unit sending in sequence and cyclically: a first pulse signal to said activation input of said first memory circuit to control activation of said memory circuit, storage of said first value of said control voltage on said first node, connection of said control terminal of said pass gate to said first line at a first reference potential, and storage of said first reference potential on said control tonal of said pass gate; a second pulse signal to said activation input of said second memory circuit to control activation of said second memory circuit, and storage of said second value of said control voltage on said first node; and a third pulse signal to said second MOS switch to control closing of said second MOS switch, and storage of said second reference potential at said control terminal of said passgate.