DS1977 Password-Protected 32KB EEPROM iButton

Status
Part Number	Status
DS1977	Active: In production, but some versions are no longer available. See Ordering Information.

Description

FULL DATA SHEET (PDF, 420kB)
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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.

Key Features

Applications/Uses

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