Patent ID: 6759895
Filing Date: 2004-07-06
Classification: G11C

Abstract:
A data latch circuit comprising:a voltage selection block for selecting one of a normal operating voltage supplied from a first power source and a programming voltage supplied from a second power source, to output a selected voltage through a voltage selection node; a first first-conductivity-type MOSFET including a source and a backgate connected together to said voltage selection node, a gate directly connected to a first output terminal, and a drain connected to a second output terminal; a second first-conductivity-type MOSFET including a source and a backgate connected together to said voltage selection node, a gate directly connected to said second output terminal, and a drain connected to said first output terminal; a first anti-fuse element including a first electrode connected to said first output terminal, a second electrode connected to a third power source, and an insulating film sandwiched between said first electrode and said second electrode and having a first withstand voltage lower than said programming voltage; a second anti-fuse element including a first electrode connected to said second output terminal, a second electrode connected to said third power source, and an insulating film sandwiched between said first electrode and said second electrode and having said first withstand voltage; a first second-conductivity-type MOSFET including a drain connected to said second output terminal, a gate for receiving a first control signal, and a source and a backgate connected together to said third power source; a second second-conductivity-type MOSFET including a drain connected to said first output terminal, a gate receiving a second control signal, and a source and backgate connected to said third power source, wherein: each of said first and second first-conductivity-type MOSFETs and said first and second second-conductivity-type MOSFETs includes a gate insulation film having a second withstand voltage higher than said programming voltage.