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Fairchild incorporates Tru-Translation to FST switches

Posted: 26 Mar 2002 ?? ?Print Version ?Bookmark and Share

Keywords:fst switch ic? tru translation? fstd16450? fstud16450? fstd3125?

Faichild Semiconductor has announced that it has incorporated Tru-Translation circuitry into its high-bit count FST bus switches for interfacing 5V inputs to 3.3V outputs. The circuitry is claimed to eliminate charge buildup during high-impedance and high-frequency edge-rate switching, as well as protects CPU busses, memory modules, and ASICs from overvoltage failures.

"IC reliability is compromised whenever the gate oxide on a 3.3V-device on the switch output is stressed by a higher than expected voltage,: said Rick Whitcomb, product marketing manager for bus switches at Fairchild.

"Output overvoltage stress could lead to immediate, random device failures, ordepending on gate-oxide thicknessfaiulures could occur one or two years later," he added.

Tru-Translation integrates a voltage reference and a current amplifier into a comparator circuit that monitors charge buildup during voltage translation. When this charge climbs above a referenced voltage, the comparator turns on the amplifier to create a discharge path to ground for the trapped charge.

Previous applications used a diode to translate from 5.5V to 3.3V. However, input-edge rates >1.0V/ns or input frequencies >10MMHz, prevented the translating diode from dissipating the trapped charge. The trapped charge raises the output level in the output bus thereby corrupting data and shortening component lifetime.

The Tru-Translation circuitry is initially available with the company's 4-bit to 20-bit and configurable devices, including FSTD16450, FSTUD16450, FSTD3125, and FSTUD32450. The company plans to extend the Tru-Translation capability to the entire FSTD bus switch family.

The devices are available in SOIC, SSOP, QSOP, TSSOP, and BGA packages. Pricing starts at 60 cents each for the 10-bit bus switches and $1.35 each for the 20-bit version, both in quantities of 1,000.

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