Antifuse latch device with controlled current programming and variable trip point
First Claim
1. A latch device having a variable resistive trip point, comprising:
- a voltage source;
an adjustable trip point current reference;
a latch circuit having a fuse latch output; and
a trip point control element, said trip point control element being operable to control the amount of current passing through said latch circuit based on said adjustable trip point current reference, thereby providing the latch device with a variable resistive trip point.
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Accused Products
Abstract
A latch device is provided having a variable resistive trip point and controlled current programming. The latch device has a trip point current control element that controls an amount of current passing from a voltage source into the latch circuit, thereby varying the resistive trip point of the latch device. The latch device also has a programming current control element that controls an amount of programming current passing through the fuse element during programming. The trip point current reference and a programming current reference are provided by reference circuits having a plurality of selectable inputs that operate to change the current references binarily. An integrated circuit is also provided in which a plurality of the fuse latch devices are connected together in parallel such that the same trip point current reference and programming current reference are supplied to each latch device.
76 Citations
19 Claims
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1. A latch device having a variable resistive trip point, comprising:
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a voltage source;
an adjustable trip point current reference;
a latch circuit having a fuse latch output; and
a trip point control element, said trip point control element being operable to control the amount of current passing through said latch circuit based on said adjustable trip point current reference, thereby providing the latch device with a variable resistive trip point. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
a fuse element connected to said latch circuit; and
a programming circuit connected to said fuse element, said programming circuit having a current control element for adjusting an amount of programming current passing through said fuse element, said current control element being controlled by an adjustable current reference.
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16. An integrated circuit comprising:
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a global trip point control circuit that provides an adjustable trip point current reference; and
a plurality of fuse latch devices, each fuse latch device comprising a latch circuit having a fuse latch output and a trip point control element, said trip point control elements being connected in parallel to said adjustable trip point current reference and being operable to control an amount of current passing through each of said latch circuits based on said adjustable trip point current reference. - View Dependent Claims (17, 18, 19)
a global programming current control circuit that provides an adjustable programming current reference; and
each fuse latch device having a fuse element and a programming current control device, said programming current control devices being connected in parallel to said adjustable programming current reference and being operable to control an amount of programming current passing through each of said fuse elements based on said adjustable programming current reference.
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19. The integrated circuit as set forth in claim 18, wherein said global programming current control circuit comprises a plurality of selectable inputs which are operable to change the adjustable programming current reference binarily.
Specification