An Antifuse programming technology is predominantly associated with _____. Antifuse technology is nonvolatile, so it is live at power-up and programming services, either from Actel or from other vendors, are also used. recommended programming practices for antifuse devices. For SoC Antifuse technology is nonvolatile, so it is live at power-up and inherently very secure.
|Published (Last):||5 September 2006|
|PDF File Size:||8.4 Mb|
|ePub File Size:||15.47 Mb|
|Price:||Free* [*Free Regsitration Required]|
Views Read Edit View history.
Antifuses may be used in programmable read-only memory Pfogramming. This page was last edited on 7 Julyat The spike is formed on and slightly below the silicon surface, just below the passivation layer without damaging it.
Antifuse programming technology – FPGAs
The terminals of the antifuses are usually accessible as bonding pads and ahtifuse trimming process is performed before wire-bonding and encapsulating the chip.
This technology has many applications. They may be less susceptible to alpha particles which can cause circuits to malfunction.
Antifuse programming technology – FPGAs
Dielectric antifuses employ a very thin oxide barrier between a pair of conductors. Fechnology conductive shunt therefore does not compromise integrity and reliability of the semiconductor device. Often a special bulb with no antifuse and often a slightly different rating so it blows first as the voltage gets too high known as a “fuse bulb” is incorporated into the string of lights to protect against the possibility of severe overcurrent if too many bulbs fail. When the bulb blows, the entire mains voltage is applied across the single blown lamp.
Zener diodes can be used as antifuses. May Learn how and when to remove this template message. As the number of bonding pads is limited for a given size of the chip, various multiplexing strategies are used for larger number of antifuses. Each individual street-lamp was equipped with a film cutout ; a small disk of insulating film that separated two contacts connected to the two wires leading to the lamp.
This programming, performed after manufacturing, is permanent and irreversible. Zener zap is technolofy employed in mixed-signal circuits for trimming values of analog components. Because the series string would be rendered inoperable by a single lamp failing, each bulb has an antifuse installed within it.
In this way, the failed lamp was prograjming and illumination restored to the rest of the street. Please help improve this article by adding citations to texhnology sources. Unsourced material may be challenged and removed. Articles needing additional references from May All articles needing additional references.
Unlike Christmas lights, the circuit usually contained an automatic programmijg to amtifuse the electric current flowing in the circuit, preventing the current from rising as additional lamps burned out. This rapidly causes the antifuse to short out the blown bulb, allowing the series circuit to resume functioning, albeit with a larger proportion of the mains voltage now applied to each of the remaining lamps.
A standard NPN transistor structure is often used in antifhse bipolar processes as the antifuse. Amorphous silicon is a material usually not used in either bipolar or CMOS processes and requires an technplogy manufacturing step.
With a poly-diffusion antifuse, the high current density creates heatwhich melts a thin insulating layer between polysilicon and diffusion electrodes, creating a permanent resistive silicon link. Certain programmable logic devices PLDssuch as structured ASICsuse antifuse technology to configure logic circuits and create a customized design from a standard IC design.
Programmijg approach for the ICs that use antifuse technology employs a thin barrier of non-conducting amorphous silicon between two metal conductors.
Antifuse – Wikipedia
The resulting resistance of the junction is in the range of 10 techonlogy. The antifuse is usually triggered using an approximately 5 mA current. The insulation of the antifuse wire withstands the ordinary low voltage imposed across a functioning lamp programmong rapidly breaks down under the full mains voltage, giving the antifuse action.
They are historically used especially with bipolar processes, where the thin oxide needed for dielectric antifuses is not available. Each bit contains both a fuse and an antifuse and is programmed by triggering one of the two. Whereas a fuse proggamming with a low resistance and is designed to permanently break an electrically conductive path typically when the current through the path exceeds a specified limitan antifuse starts with a high resistance and is designed to permanently create an electrically conductive path typically when the voltage across the antifuse exceeds a certain level.
In a technoogy fashion to that of Christmas tree lights, before the advent of high-intensity discharge lampsstreet light circuits using incandescent light bulbs were often operated as high-voltage series circuits.
It is therefore necessary to shift the manufacturing tolerances so that the lowest-value typically made is equal to or larger than the desired value. For example a precision resistor can be manufactured by forming several series resistors with Zeners in parallel oriented to be nonconductive during normal operation of the device and then shorting selected Zeners to shunt the unwanted resistors.
An antifuse is an electrical device that performs the opposite function to a fuse. When a sufficiently high voltage is applied across the amorphous silicon it is turned into a polycrystalline silicon-metal alloy with a low resistancewhich is conductive.
From Wikipedia, the free encyclopedia. In some cases a combined circuit with zeners and transistors can be used to form a zapping matrix; with additional zeners, the trimming which uses voltages higher than the normal operational voltage of the chip can be performed even after packaging the chip. Also circuits built via the antifuse’s permanent conductive paths may be faster than similar circuits implemented in PLDs using SRAM technology.
FPGAs in computer
The parallel resistors cannot have too low value as that would sink the zapping current; a series-parallel combination of resistors and antifuses is employed in such cases. By this approach, it is possible only to lower the value of the resulting resistor.
Occasionally, the insulation fails to break down on its own, but tapping the blown lamp will usually finish the job.
Antifuses are best known for their use in mini-light or miniature style low-voltage Christmas tree lights.
The antifuse is made using wire with a high resistance coating and this wire is coiled over the two vertical filament support wires inside the bulb. The p-n junction that serves as such diode is overloaded with a current spike and overheated.
Antifuses are widely used to permanently program integrated circuits ICs. A specialized structure optimized for the purpose can be employed where the antifuse is an integral part of the design. The larger, traditional, C7 and C9 style lights are wired in parallel and are rated to operate directly at mains voltage.
Retrieved from ” https: This article needs additional citations for verification. Their disadvantage, however, is lower area efficiency compared to other types.