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  Date: 28/05/2015

Non volatile memory for medical device withstands harsh gamma radiation

Medical devices and life science electronics products need to be radiation proof to remain functional after the heavy gamma radiation, which is one of the effective sterilization process.

If you are designing a single-use disposable medical sensors and consumables, you need to use a non floating-gate non volatile memory technologies in semiconductor chips to protect memory data from gamma's high-ionizing radiation which erases the memory. Maxim is offering a new device called DS28E80 NV memory, which is resistant to gamma radiation up to 75kGy (kilo gray). DS28E80 features flexible programming options and it can be connected through a single wire interface, so consumable manufacturers can use single wire/contact.

Other advantages and features as shared by Maxim include:
Manufacturing calibration: OEMs can automatically detect and calibrate sensors and accessories to ensure quality
Usage tracking: guards against incorrect attachment and warns or prevents unsanitary reuse of consumables
Embedded identification: embedded 1-Wire protocol provides unalterable 64-bit factory-assigned serial ID which allows for tracking and can prevent usage of unauthorized consumables
Reprogrammable: 248 bytes of user memory organized in 8-byte blocks
Permanent write protection: flexible per-block options for use memory

"By using Gamma, we typically see a reduction in cycle time of around two weeks from our manufacturing plant to distribution centers," said Patrick Weizman, Chief Engineer at Ethicon Endo-Surgery. "Gamma sterilization reduces cost and simplifies the process for less rework and shorter cycle times."

"We know that gamma radiation has historically been incompatible with NV memory technologies, but for some single-use medical applications gamma radiation may be the preferred method for sterilization," said Nathan Sharp, Business Manager at Maxim Integrated. "So we designed an NV memory that resists the radiation, connects to a host medical device simply, and then reliably monitors or prevents reuse of the consumable. It's all as simple as its 1-Wire interface."

The DS28E80 is specified over the -40-degree Celsius to +85-degree Celsius temperature range. A DS28E80EVKIT evaluation (EV) kit is available.

More info at: www.maximintegrated.com/en/products/digital/memory-products/DS28E80.html.

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