Winbond's 25X SpiFlash family delivers nonvolatile memory in capacities up to 64 Mbits. Its maximum transfer rate is 75 MHz, and its dual data pins provide an effective rate of 150 MHz. This throughput is in the range of parallel flash. Such an approach extends the normal three-wire serial peripheral interface (SPI) to four wires, so a single eight-pin small-outline IC can easily support the 25X SpiFlash. The chips have 4-kbyte sectors. A 64-kbyte block can be erased in 1 s. The 4-Mbit chip costs $0.71 and the 8-Mbit chip costs $0.98, both in 10,000-unit lots.
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