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Rad-hard 16Mbit SRAM MCM suits space apps

Posted: 11 Jan 2007 ?? ?Print Version ?Bookmark and Share

Keywords:SRAM? MCM? CMOS? Atmel? rad-hard?

space="7" ALT="Atmel's AT68166 rad-hard SRAM MCM" ALIGN="RIGHT">

MCM packaging technology offers the advantages of reducing PCB real estate, the number of individual components and improves overall electronic effectiveness. Atmel Corp.'s new AT68166, a 16Mbit SRAM packaged in a hermetic multichip module (MCM) for space applications, allows a reduction of the PCB area by 50 percent with a weight savings of 75 percent compared to four 4Mbit packages.

The AT68166 MCM incorporates four 4Mbit AT60142 SRAM dice that are produced on Atmel's radiation-hardened 0.25?m CMOS process.

CMOS asynchronous SRAM
The AT68166 is a very low-power CMOS asynchronous SRAM. It can be organized as either one bank of 512K x 32, two banks of 512K x 16 or four banks of 512K x 8. It combines rad-hard capabilities, a latch-up threshold of and a total dose of 300Krad, with a fast access time.

The SRAM operates at 3.3V and is available in two versions: the AT68166FT with 5V-tolerance inputs and the AT68166F for 3V operation. The access times are respectively 25ns and 20ns over the full military temperature range. The AT68166 MCM offers low power consumption: 540mW per byte at 25ns and 620mW per byte at 20ns.

Fit for space industry
The AT68166F/FT are available in a 68-lead flat pack; they weigh 8.6g thus meeting the rigorous size and weight requirements of the space industry. Also, thanks to the small size of the 4Mbit SRAM, Atmel has been able to accommodate the assembly of the four dice on one side of the package which facilitates the power dissipation.

The AT68166 is a cost-attractive alternative to existing 16Mbit SRAM offerings. The compatibility with other products allows designers of space applications to easily migrate their designs to the Atmel AT68166 memories.

Samples and production parts are available for both variants. The AT68166 is QML Q and V qualified and supported by the SMD 5962-06229. The AT68166 is priced at $1,710 each, in QML Q, for 100 pieces. In early 2007, the access times will be improved from 20-25ns to 18-20ns.

- Marty Gold

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