DS1991 MultiKey IButton

The DS1991 MultiKey iButton is a rugged read/write data Carrier that acts as three separate electronic keys, offering 1,152 bits of secure, nonvolatile memory. Each key is 384 bits long with distinct 64-bit password and public ID fields (Figure 1). The password field must be matched in order to access the secure memory. Data is transferred serially via the 1-Wire protocol, which requires only a single data lead and a ground return. The 512-bit scratchpad serves to ensure integrity of data transfers to secure memory. Data should first be written to the scratchpad where it CAN be read back. After the data has been verified, a copy scratchpad command will transfer the data to the secure memory. This process ensures data integrity when modifying the memory. A 48-bit serial number is factory lasered into each DS1991 to provide a guaranteed unique identity which allows for absolute traceability. The family code for the DS1991 is 02h. The durable MicroCan package is highly resistant to environmental hazards such as dirt, moisture and shock. Its compact button-shaped profile is self-aligning with mating receptacles, allowing the DS1991 to be easily used by human operators. Accessories permit the DS1991 to be mounted on plastic key fobs, photo-ID badges, printed-circuit boards or any smooth surface of an object. Applications include secure access control, debit tokens, work-in-progress tracking, electronic travelers and proprietary data.
By Maxim Integrated Products
Part Manufacturer Description Datasheet Samples
DS1991L-F5/A1A Maxim Integrated Products MultiKey iButton
DS1991L-702-00A Maxim Integrated Products MultiKey iButton
DS1991L-702-00A+ Maxim Integrated Products MultiKey iButton
DS1991L+004-000 Maxim Integrated Products MultiKey iButton
DS1991L-F5+ Maxim Integrated Products Memory Circuit, 1152X1, CMOS, MEDB2, ROHS COMPLIANT, MICROCAN-2
DS1991L-004-000 Maxim Integrated Products MultiKey iButton
DS1991L-F5 Maxim Integrated Products Memory Circuit, 1152X1, CMOS, MEDB2, MICROCAN-2
DS1991L-003-0000 Maxim Integrated Products MultiKey iButton
DS1991 's PackagesDS1991 's pdf datasheet
DS1991L-F5 CAN




DS1991 Pinout will be updated soon..., now you can download the pdf datasheet to check the pinouts !
DS1991 circuits will be updated soon..., now you can download the pdf datasheet to check the circuits!

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DS1991 Pb-Free DS1991 Cross Reference DS1991 Schematic DS1991 Distributor
DS1991 Application Notes DS1991 RoHS DS1991 Circuits DS1991 footprint
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