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):||11 August 2008|
|PDF File Size:||15.60 Mb|
|ePub File Size:||16.3 Mb|
|Price:||Free* [*Free Regsitration Required]|
Antifuse programming technology – FPGAs
The p-n junction that serves as such diode is overloaded with a current spike and overheated. Each individual street-lamp prohramming equipped with a film cutout ; a small disk of insulating film that separated two contacts connected to the two wires leading to the lamp.
From Wikipedia, the free encyclopedia.
Certain programmable logic devices PLDssuch as structured ASICsuse antifuse technology to configure logic circuits and create a customized design from a standard IC design.
They may be less susceptible to alpha particles which can cause circuits to malfunction. In a similar 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. The insulation of the antifuse wire withstands the ordinary low voltage imposed across a functioning lamp but rapidly breaks down under the full mains voltage, giving the antifuse action.
In this way, the failed lamp was bypassed and programmng restored to the rest of the street.
Amorphous silicon is a material usually not used in either bipolar or CMOS processes and requires an additional manufacturing step. Occasionally, the insulation fails to break down on its own, but tapping the blown lamp will usually finish the job.
FPGAs in computer
Please help improve this article by adding citations to reliable sources. Their disadvantage, however, is lower area efficiency compared to other types. Each bit contains both a fuse and an antifuse and is programmed by triggering one of the two.
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.
Unlike Christmas lights, the circuit usually contained an automatic antifusr to regulate the electric current flowing in the circuit, preventing the current from rising as additional lamps burned out.
Antifuse – Wikipedia
One approach for the ICs that use antifuse technology employs a thin barrier of non-conducting amorphous silicon between two metal conductors. The larger, traditional, C7 and C9 style antifse are wired in parallel and are rated to operate directly at mains voltage.
QuickLogic Corporation refers to their antifuses as “ViaLinks” because blown fuses create a connection between two crossing layers of wiring on the chip in the same way that a via on a printed circuit board creates a connection between copper layers.
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. The resulting resistance of the junction is in the range of 10 ohms. Retrieved from ” https: 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.
Ordinarily for operation from mains voltagesthe lamps are wired in series. 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.
Antifuses may be used in programmable read-only memory PROM. This page was last edited on 7 Julyat This article needs additional citations for verification. In the same fashion as with the Christmas lights described above, if the lamp failed, the entire voltage of the street lighting circuit thousands of volts was imposed across the insulating film in the cutout, causing it to rupture. 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 antifuse is usually triggered using an approximately 5 mA current. 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.
When the bulb blows, the entire mains voltage is applied across the single blown lamp. Zener zap is frequently employed in mixed-signal circuits for trimming values of analog components.
The terminals of the antifuses are usually accessible as bonding pads and the trimming process is performed before wire-bonding and encapsulating the chip. This programming, performed after manufacturing, is permanent and irreversible. This technology has many applications. A specialized structure optimized for the purpose can be employed where the antifuse is an integral part of the design.
Zener diodes can be used as antifuses. Also circuits built via the antifuse’s permanent conductive paths may be faster than similar circuits implemented in PLDs using SRAM technology. Whereas a fuse starts 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.
Antifuse programming technology – FPGAs
Views Read Edit View history. Dielectric antifuses employ tfchnology very thin oxide barrier between a pair of conductors. Formation of the conductive channel is performed by a dielectric breakdown forced by a high voltage pulse.
The conductive shunt therefore does technoloy compromise integrity and reliability of the semiconductor device. Articles needing additional references from May All technolovy needing additional references.
May Learn how and when to remove this template message. 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. Because the series string would be rendered inoperable by a single lamp failing, each bulb has an antifuse installed within it. Antifuses are widely used to permanently program integrated circuits ICs.