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DS1990R-F5 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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DS1990R-F5 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 11 page Slave-to-Master A read-data time slot begins like a write-one time slot. The voltage on the data line must remain below VILMAX until the read low time tRL is expired. During the tRL window, when responding with a 0, the DS1990R starts pulling the data line low; its internal timing generator determines when this pulldown ends and the voltage starts rising again. When responding with a 1, the DS1990R does not hold the data line low at all, and the voltage starts rising as soon as tRL is over. The sum of tRL + δ (rise time) on one side and the inter- nal timing generator of the DS1990R on the other side define the master sampling window (tMSRMIN to tMSRMAX) in which the master must perform a read from the data line. For most reliable communication, tRL should be as short as permissible and the master should read close to but no later than tMSRMAX. After reading from the data line, the master must wait until tSLOT is expired. This guarantees sufficient recovery time tREC for the DS1990R to get ready for the next time slot. Serial Number iButton _______________________________________________________________________________________ 9 Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. F3 iButton IB#3NB 21-0252 — F5 iButton IB#5NB 21-0266 — |
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