DS1977
Password-Protected
32kB EEPROM iButton
www.maxim-ic.com
iButton DESCRIPTION
SPECIAL FEATURES
The DS1977 is a 32kB EEPROM in a rugged,
®
iButton enclosure. Access to the memory can be
password-protected with different passwords for
read-only and full access. Data is transferred serially
®
through the 1-Wire protocol, which requires only a
single data lead and a ground return. Every DS1977
is factory lasered with a guaranteed unique 64-bit
registration number that allows for absolute
traceability. The durable stainless-steel iButton
package is highly resistant to environmental hazards
such as dirt, moisture, and shock. Accessories permit
the DS1977 iButton to be mounted on almost any
object, including containers, pallets, and bags.
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32kB EEPROM Organized as Pages of 64 Bytes
Each
Optional Password Protection with Different 64Bit Passwords for Read and Full Access
Communicates to Host with a Single Digital
Signal at Up to 15.3kbps at Standard Speed or
Up to 125kbps in Overdrive Mode Using 1-Wire
Protocol
Operating Range: 2.8V to 5.25V, -40°C to +85°C
Minimum 100k Write Cycles Endurance
15kV Built-in ESD Protection
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COMMON iButton FEATURES
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APPLICATIONS
Maintenance/Inspection Data Storage
Medical Data Carrier
Health Data Carrier
Audit Data Storage and Carrier
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F5 MicroCAN
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5.89
§
0.51
â
16.25
FC
â
37
000000FBC52B
17.35
§
§
1-Wireâ
Unique Factory-Lasered 64-Bit Registration
Number Assures Error-Free Device Selection
and Absolute Traceability Because No Two Parts
are Alike
Built-In Multidrop Controller for 1-Wire Net
Chip-Based Data Carrier Stores Digital Identification and Information, Armored in a Durable
Stainless-Steel Case
Data can be Accessed While Affixed to Object
Button Shape is Self-Aligning with Cup-Shaped
Probes
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 (Application Pending)
ORDERING INFORMATION
IO
PART
GND
DS1977-F5
All dimensions are shown in millimeters.
iButton, 1-Wire, and MicroCAN are registered trademarks of
Dallas Semiconductor.
TEMP RANGE
-40°C to +85°C
PACKAGE
F5 iButton
EXAMPLES OF ACCESSORIES
PART
DS9096P
DS9101
DS9093RA
DS9093A
DS9092
DESCRIPTION
Self-Stick Adhesive Pad
Multipurpose Clip
Mounting Lock Ring
Snap-In Fob
iButton Probe
Note: Some revisions of this device may incorporate deviations from published specifications known as errata. Multiple revisions of any device
may be simultaneously available through various sales channels. For information about device errata, click here: www.maxim-ic.com/errata.
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REV: 090403
