DS1972
PRODUCTIONiButton 1024-Bit EEPROM
EPROM-Emulation Mode for Protection Against Accidental Erasure or Tampering of Data
- Part Models
- 2
- 1ku List Price
- Starting From $3.40
Part Details
- 1024 Bits of EEPROM Memory Partitioned into Four Pages of 256 Bits
- Individual Memory Pages can be Permanently Write Protected or Put in EPROM-Emulation Mode ("Write to 0")
- Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise
- IEC 1000-4-2 Level 4 ESD Protection (±8kV Contact, ±15kV Air, typical)
- Reads and Writes Over a Wide Voltage Range of 2.8V to 5.25V from -40°C to +85°C
- Communicates to Host with a Single Digital Signal at 15.4kbps or 125kbps Using 1-Wire Protocol
The iButton® 256-bit EEPROM (DS1972) is a 1024-bit, 1-Wire® EEPROM chip in a rugged iButton package. Data is written to an 8-byte scratchpad, verified, and then copied to the EEPROM memory. As a special feature, the four memory pages can individually be write protected or put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state. The DS1972 communicates over the single-conductor 1-Wire bus. The communication follows the standard 1-Wire protocol. Each device has its own unalterable and unique 64-bit ROM registration number that is factory lasered into the device. The registration number is used to address the device in a multidrop, 1-Wire net environment.
Applications
- Access Control/Parking Meter
- Inventory Control
- Maintenance/Inspection Data Storage
- Tool Management
- Work-in-Progress Tracking
Documentation
Data Sheet 1
Reliability Data 1
Design Note 1
Technical Articles 8
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| DS1972-F3+ | <u>i</u>Button F3 MicroCan | ||
| DS1972-F5+ | <u>i</u>Button F5 MicroCan |
This is the most up-to-date revision of the Data Sheet.
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