Opponents of RDRAM frequently site size and heat as major negative aspects of the new RAM configuration. While you could argue that space is at a premium on any board, in certain applications, it can be critical. In an effort to free up some of that board real estate, Philips has developed a sub-miniature DDR memory module support component that offers DDR performance past the 333 MHz mark, while minimizing power use and footprint in high-end server, networking, and telecommunications apps. The new DDR1 Support Registers and Phase-Locked Loops (PLLs) and are available in TSSOP and TVSOP, which Philips says can enable module makers to reduce DDR module height by 30 percent (down to 1.25 inches). The idea is that by shrinking the modules, they can be stacked more heavily, giving manufacturers more board room to work with. The new DDR Support Registers and PLLs are compliant with JEDEC DDR memory module standards. The PCKV857 70-190 MHz differential 1:10 SDRAM Clock Driver and the SSTV16857 14-bit SSTL_2 Registered Driver are both available in volume now in the TSSOP-48 package, and are sampling in the TVSOP-48 package priced at US$1.80 and US$1.70, respectively, for 100,000 units. The SSTV16859 13- to 26-bit SSTL_2 Registered Driver for Stacked DDR DIMMs is available in volume now in TSSOP-64 packages priced at US$2.40 for 100,000 units. The PCKV856 70-190 MHz I2C Differential 1:10 SDRAM Clock Driver and the SSTV16856 14-bit SSTL_2 Registered Driver/Buffer are both sampling now in the TSSOP-48 package priced at US$2.00 and US$1.90, respectively, for 100,000 units.