DS1977 Datasheet, PDF (1/29 Pages) Dallas Semiconductor – 32KB EEPROM iButton

19-4890; 11/09
www.maxim-ic.com
iButton DESCRIPTION
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.
APPLICATIONS
Maintenance/Inspection Data Storage
Medical Data Carrier
Health Data Carrier
Audit Data Storage and Carrier
F5 MicroCAN
5.89
0.51

16.25
0^F0^C0000FBC^52³B⁷
1-Wire^
17.35
IO
GND
All dimensions are shown in millimeters.
iButton and 1-Wire are registered trademarks of Maxim
Integrated Products, Inc.
DS1977
Password-Protected
32KB EEPROM iButton
SPECIAL FEATURES
 32KB EEPROM Organized as Pages of 64 Bytes
Each
 Optional Password Protection with Different 64-
Bit 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
COMMON iButton FEATURES
 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
ORDERING INFORMATION
PART
TEMP RANGE
PACKAGE
DS1977-F5# -40C to +85C F5 iButton
#Denotes an RoHS-compliant device that may include lead(Pb)
that is exempt under the RoHS requirements.
EXAMPLES OF ACCESSORIES
PART
DESCRIPTION
DS9096P
DS9101
DS9093RA
DS9093A
DS9092
Self-Stick Adhesive Pad
Multipurpose Clip
Mounting Lock Ring
Snap-In Fob
iButton Probe
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