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20Kb 1-Wire EEPROM

20Kb Serial EEPROM Operates from Single-Contact 1-Wire Interface

Product Details

Key Features

Parametric specs for Memory (EPROM, EEPROM, ROM, NV SRAM)
End Equipment Medical Consumable ID
PCB ID and Authentication
Peripheral ID and Control
Print Cartridge Authentication
Memory Type EEPROM
Memory Size 20K x 1
Bus Type 1-Wire
Package/Pins TDFN/6
TO92/3
TSOC/6
Budgetary
Price (See Notes)
1.54
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Simplified Block Diagram

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Parameters

Parametric specs for Memory (EPROM, EEPROM, ROM, NV SRAM)
End Equipment Medical Consumable ID
PCB ID and Authentication
Peripheral ID and Control
Print Cartridge Authentication
Memory Type EEPROM
Memory Size 20K x 1
Bus Type 1-Wire
Package/Pins TDFN/6
TO92/3
TSOC/6
Budgetary
Price (See Notes)
1.54

Key Features

  • 20480 Bits of Nonvolatile (NV) EEPROM Partitioned into Eighty 256-Bit Pages
  • Individual 8-Page Groups of Memory Pages (Blocks) can be Permanently Write Protected or Put in OTP EPROM-Emulation Mode ("Write to 0")
  • Read and Write Access Highly Backward-Compatible to Legacy Devices (e.g., DS2433)
  • 256-Bit Scratchpad with Strict Read/Write Protocols Ensures Integrity of Data Transfer
  • 200k Write/Erase Cycle Endurance at +25°C
  • Unique Factory-Programmed 64-Bit Registration Number Ensures Error-Free Device Selection and Absolute Part Identity
  • Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise
  • Communicates to Host at 15.4kbps or 90kbps Using 1-Wire Protocol
  • Low-Cost TO-92 Package
  • Operating Range: 4V to 5.25V, -40°C to +85°C
  • Operating Range: 3.135V to3.465V, 0°C to +70°C (Standard Speed only)
  • IEC 1000-4-2 Level 4 ESD Protection (±8kV Contact, ±15kV Air, Typical) for I/O Pin

Applications/Uses

  • Card/Module Identification in Rack-Based Systems
  • Device Authentication
  • IEEE 1451.4 Sensors
  • Ink and Toner Cartridge ID
  • Medical and Industrial Sensor Identification/Calibration
  • PCB Identification
  • Smart Cable

Description

The DS28EC20 is a 20480-bit, 1-Wire® EEPROM organized as 80 memory pages of 256 bits each. An additional page is set aside for control functions. Data is written to a 32-byte scratchpad, verified, and then copied to the EEPROM memory. As a special feature, blocks of eight memory pages can be write protected or put in EPROM-Emulation mode, where bits can only be changed from a 1 to a 0 state. The DS28EC20 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. The registration number is used to address the device in a multidrop 1-Wire net environment.

Simplified Block Diagram

DS28EC20: Typical Operating Circuit DS28EC20: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .