DS1994 Datasheet, PDF (1/23 Pages) Dallas Semiconductor – 4kb Plus Time Memory iButton

19-5049; 11/09
DS1994
DS1994
4Kb Plus Time Memory iButton®
www.maxim-ic.com
SPECIAL FEATURES
 4096 bits of Read/Write Nonvolatile Memory
 256-bit Scratchpad Ensures Integrity of Data
Transfer
 Memory Partitioned into 256-bit Pages for
Packetizing Data
 Data Integrity Assured with Strict Read/Write
Protocols
 Contains Real-Time Clock/Calendar in Binary
Format
 Interval Timer Can Automatically Accumulate
Time When Power is Applied
 Programmable Cycle Counter can Accumulate
the Number of System Power-On/Off Cycles
 Programmable Alarms Can Be Set to Generate
Interrupts for Interval Timer, Real-Time
Clock, and/or Cycle Counter
 Write-Protect Feature Provides Tamperproof
Time Data
 Programmable Expiration Date That Limits
Access to SRAM and Timekeeping
 Clock Accuracy is Better Than ±2 Minutes/
Month at 25°C
 Operating Temperature Range from -40°C to
+70°C
 Over 10 Years of Data Retention
F5 MicroCan
iButton and 1-Wire are registered trademarks of Maxim Integrated
Products, Inc.
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 1-Wire Network
 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 Cup-
Shaped 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
 Meets UL#913 (4th Edit.); Intrinsically Safe
Apparatus, Approved under Entity Concept
for Use in Class I, Division 1, Group A, B, C
and D Locations
ORDERING INFORMATION
DS1994L-F5+
F5 MicroCan
+Denotes a lead(Pb)-free/RoHS-compliant package.
EXAMPLES OF ACCESSORIES
DS9096P Self-Stick Adhesive Pad
DS9101 Multi-Purpose Clip
DS9093RA Mounting Lock Ring
DS9093F Snap-In Fob
DS9092 iButton Probe
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