The ISSI high-performance QUAD Synchornous SRAM family is ideal for networking applications and is compatible with QDR II™ products. The ISSI QUAD Synchronous SRAM family includes the IS61QDB21M36, which is a burst of two separate I/O device organized as 1Mx36, and the IS61QDB22M18, which is the 2Mx18 version. ISSI QUAD Synchronous SRAM family devices run at 250 MHz and are packaged in a 165-ball fine ball grid array package with a 15 mm x 17mm body size and a 1mm pitch.