DS1991L-F5 MultiKey iButton with Black Fob Assembled

DS1991L-F5 with Black Fob Assembled

Place of Origin: China(Mainland) Part Number: DS1991L-F5-B Brand Name: Dallas / Maxim Integrated
Min. Order Quantity: 100 Pieces Port: Guangzhou Payment Terms: T/T, Western Union, Paypal

DS1991L-F5 MultiKey iButton with Black Fob Assembled

Description

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.

Special Features

1,152-bit secure read/write, nonvolatile memory
Secure memory cannot be deciphered without matching 64-bit password
Memory is partitioned into 3 blocks of 384 bits each
64-bit password and ID fields for each memory block
512-bit scratchpad ensures data transfer integrity
Operating temperature range: -40°C to +70°C
Over 10 years of data retention

Common iButton Features

Unique, factory-lasered and tested 64-bit registration number (8-bit family code + 48-bit serial number + 8-bit CRC tester) assures absolute traceability because no two parts are alike
Multidrop controller for MicroLAN
Digital identification and information by momentary contact
Chip-based data carrier compactly stores information
Data can be accessed while affixed to object
Economically communicates to bus master with a single digital signal at 16.3kbps
Standard 16mm diameter and 1-Wire? protocol ensure compatibility with iButton family
Button shape is self-aligning with cupshaped probes
Durable stainless steel case engraved with registration number withstands harsh environments
Easily affixed with self-stick adhesive backing, latched by its flange, or locked with a ring pressed onto its rim
Presence detector acknowledges when reader first applies voltage
Designed to meet UL#913 (4th Edit.); Intrinsically Safe Apparatus, Under Entity Concept for use in Class I, Division 1, Group A, B, C and D Locations, contact Dallas Semiconductor for certification schedule