Digital ICs/DSPs: DDR DRAM Modules Drive Data At 200, 266, Or 333 Mbits/s

Based on the 200-pin JEDEC SO-DIMM standard, the W3EG7266S-D4 512-Mbyte memory module delivers double-data-rate (DDR) throughput at 100, 133, or 166 MHz (200, 266, and 333 Mbits/s). Using 512-Mbit DDR DRAMs, the unbuffered module offers edge-aligned data outputs and center-aligned data inputs. It's organized as 64 Mwords by 72 bits and comes in two height options: BD4 at 1.25 in. and AD4 at 1.38 in. It also incorporates bidirectional data strobes; differential clock inputs; a programmable burst length of 2, 4, or 8; and a programmable read latency of 2 or 2.5. Other features include auto- and self-refresh and serial presence detect. In lots of 1000, it costs $155 each. Delivery is four to six weeks.