The HB52R649E1U belongs to 8-byte DIMM (Dual In-line Memory Module) family, and has been developed as an optimized main memory solution for 8-byte processor applications. The HB52R649E1U is a 64M x 72 x 1-bank Synchronous Dynamic RAM Registered Module, mounted 18 pieces of 256-Mbit SDRAM (HM5225405BTB) sealed in TCP package, 1 piece of PLL clock driver, 2 pieces of register driver and 1 piece of serial EEPROM (2-kbit) for Presence Detect (PD). An outline of the HB52R649E1U is 168-pin socket type package (dual lead out). Therefore, the HB52R649E1U makes high density mounting possible without surface mount technology. The HB52R649E1U provides common data inputs and outputs. Decoupling capacitors are mounted beside each TCP on the module board. Note: Do not push the cover or drop the modules in order to protect from mechanical defects, which would be electrical defects.