Synchronous dynamic random-access memory is any dynamic random-access memory where the operation of its external pin interface is coordinated by an externally supplied clock signal. SDRAM (Synchronous Dynamic Random Access Memory): "Synchronous" tells about the behaviour of the DRAM type. SDRAM is the name for any DRAM memory where the operation is synchronised by an external clock signal. SDRAM synchronous DRAM is a generic name for various kinds of dynamic random access memory DRAM that are synchronized with the clock speed that the. Synchronous dynamic random-access memory (SDRAM) is any dynamic random -access memory (DRAM) where the operation of its external pin interface is.