The SST55LD017A is a standard performance ATA disk controller supporting capacities up to 128 MB. SST55LD017B is a high-performance ATA disk controller with sustained write performance up to 2.4 MB/ sec. SST55LD017C is a super high-performance ATA disk controller with sustained write performance up to 4.0 MB/sec. Both the SST55LD017B and SST55LD017C can support up to 5 flash media devices directly for a maximum capacity of 640 MB. By using an external decoder, the SST55LD017B and SST55LD017C can support up to 16 flash media devices for the equivalent capacity of 2 GB. Users can select either an internal or external system clock option for optimal performance vs. the supply current. The ATA flash disk controller comes packaged in an industry standard 100-lead TQFP package for easy integration into an SMT manufacturing process. The ATA flash disk controller also comes preprogrammed with a 10-byte unique serial ID. For even greater system security and data protection, the user has the option of programming an additional 10 Bytes of ID space to create a unique, 20 Byte ID. The controller also offers a WP_PD# pin to protect data stored on flash media from unauthorized overwrites. The SST logo and SuperFlash are registered trademarks of Silicon Storage Technology, Inc. These specifications are subject to change without notice.