The 16Gb (TwinDie™) DDR4 SDRAM uses Micron’s 8Gb DDR4 SDRAM die; two x8s combined to make one x16. Similar signals as mono x16, there is one extra ZQ connection for faster ZQ Calibration and a BG1 control required for x8 addressing. Refer to Micron’s 8Gb DDR4 SDRAM data sheet (x8 option) for the specifications not included in this document. Specifications for base part number MT40A1G8 correlate to TwinDie manufacturing part number MT40A1G16.