US 5,495,181 A · Integrated circuit facilitating simultaneous programming of multiple antifuses

Abstract

To facilitate the simultaneous programming of multiple antifuses on an integrated circuit, a first current path is established from a first programming terminal (VPP1) of a programmable logic device through a first antifuse to be programmed and a second current path is established from a second programming terminal (VPP2) of the programmable logic device through a second antifuse to be programmed. By supplying the programming current for programming the first antifuse from a different terminal than the programming current for programming the second antifuse, the two antifuses can be programmed simultaneously with an adequate amount of programming current being supplied to each antifuse. A programming current multiplexer circuit is disclosed for selectively coupling either a first programming voltage (VPP1) terminal, a second programming voltage (VPP2), or a ground terminal (GND) to a programming bus and/or to an antifuse to be programmed. The first and second current paths can be established using multiple such programming current multiplexer circuits.

Claims22

Dependent claims

An integrated circuit, comprising:

an antifuse;
a first programming current terminal;
a second programming current terminal;
a third programming current terminal;
a programming current multiplexer circuit having a first input lead coupled to said first programming current terminal, a second input lead coupled to said second programming current terminal, a third input lead coupled to said third programming current terminal, and an output lead;
and
an electrical connection coupling said antifuse to said output lead of said programming current multiplexer circuit.

4 more elements

An integrated circuit, comprising:

a first programming current terminal;
a second programming current terminal;
a third programming current terminal;
a first programming bus;
a second programming bus;
a third programming bus;
a fourth programming bus;
a first programming current multiplexer circuit having a first input lead coupled to said first programming current terminal, a second input lead coupled to said second programming current terminal, a third input lead coupled to said third programming current terminal, and an output lead coupled to said first programming bus;
a second programming current multiplexer circuit having a first input lead coupled to said first programming current terminal, a second input lead coupled to said second programming current terminal, a third input lead coupled to said third programming current terminal, and an output lead coupled to said second programming bus;
a third programming current multiplexer circuit having a first input lead coupled to said first programming current terminal, a second input lead coupled to said second programming current terminal, a third input lead coupled to said third programming current terminal, and an output lead coupled to said third programming bus;
a fourth programming current multiplexer circuit having a first input lead coupled to said first programming current terminal, a second input lead coupled to said second programming current terminal, a third input lead coupled to said third programming current terminal, and an output lead coupled to said fourth programming bus;
a first antifuse programmable by current flowing from said first to said second programming bus;
and
a second antifuse programmable by current flowing from said third to said fourth programming bus.

11 more elements

Dependencies are inferred from the claim text.

Integrated circuit facilitating simultaneous programming of multiple antifuses

Life of this patent

Integrated circuit facilitating simultaneous programming of multiple antifuses

Life of this patent

Abstract

Claims22