The Samsung M390S2858DTU is a 128M bit x 72 Synchronous Dynamic RAM high density memory module. The Samsung M390S2858DTU consists of eighteen CMOS Stacked 128Mx4 bit Synchronous DRAMs in three TSOP-II 400mil packages, two 18-bits Drive ICs for input control signal, one PLL in 24-pin TSSOP package for clock and one 2K EEPROM in 8-pin TSSOP package for Serial Presence Detect on a 168pin glass-epoxy substrate. Two 0.1uF decoupling capacitors are mounted on the printed circuit board in parallel for each SDRAM. The M390S2858DTU is a Dual In-line Memory Module and is intented for mounting into 168-pin edge connector sockets.