DS28EC20

20Kb 1-Wire EEPROM

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


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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.
DS28EC20: Typical Operating Circuit DS28EC20: Typical Operating Circuit Enlarge+

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
Part NumberApplicationsMemory TypeMemory SizeBus TypePackage/PinsBudgetary
Price
See Notes
DS28EC20 
Medical Consumable ID
PCB ID and Authentication
Peripheral ID and Control
Print Cartridge Authentication
EEPROM20K x 11-Wire
TDFN-EP/6
TO92/3
TSOC/6
$1.38 @1k
See All Memory (EPROM, EEPROM, ROM, NV SRAM) (53)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


DS9120: Socket Boards for Evaluating 1-Wire Devices
DS9120P: Socket Boards for Evaluating 1-Wire Devices
DS9120Q: Socket Boards for Evaluating 1-Wire Devices

CAD Symbols and Footprints

  • DS28EC20+
  • DS28EC20+T
  • DS28EC20P+
  • DS28EC20P+T
  • DS28EC20Q+T
  • DS28EC20Q+U
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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