Global Standards for the Microelectronics Industry
TEST METHOD FOR ESTABLISHING X-RAY TOTAL DOSE LIMIT FOR DRAM DEVICES
This test method is offered as a standardized procedure to determine the total dose limit of DRAMs by measuring its refresh time tRef degradation after the device is irradiated with an X-Ray dose. This test method is applicable to any packaged device that contains a DRAM die or any embedded DRAM structure. Some indirect test methods such as wafer level characterization of total dose induced changes in leakage of access transistors are not described in this standard but are permissible as long as a good correlation is established.