DS1972：iButton 1024-Bit EEPROM
EPROM-Emulation Mode for Protection Against Accidental Erasure or Tampering of Data
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.
Key Features- 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
|  Applications/Uses- Access Control/Parking Meter
- Inventory Control
- Maintenance/Inspection Data Storage
- Tool Management
- Work-in-Progress Tracking
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DataSheet
Parametrics
| Part Number | Technology | Applications | Memory Type | Memory Size | Unique Ware | Real Time Clock | Budgetary
Price |
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| See Notes |
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| DS1972 | iButton | Asset Management | EEPROM | 1K bits | No | No | $2.60 @1k |
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Quality and Environmental Data
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
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| DS1972-F3+ | Active | | CAN-F3,;2 pin;301 mm² | -40°C to +85°C | Lead Free |
| DS1972-F5+ | Active | | CAN-F5,;2 pin;301 mm² | -40°C to +85°C | Lead Free |
