The DS21455 is pin and software compatible with the DS21Q55 for convenient migration of existing designs. The DS21458 is software compatible with the DS21Q55. The DS21455 is packaged in a 27mm x 27mm CSBGA, whereas the DS21458 has a slightly smaller package for higher density applications (17mm x 17mm).
All devices are available in commercial (0 degrees Celsius to +70 degrees Celsius) and industrial(-40 degrees Celsius to +85 degrees Celsius) temperature ranges. Prices start at $36.99 for the DS21458 and $39.99 for the DS21455 (1000-up, FOB USA). An evaluation kit is available to speed designs.
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