DS28EC20:20Kb 1-Wire EEPROM

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

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.

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: 5V ±5%, -40°C to +85°C
  • IEC 1000-4-2 Level 4 ESD Protection (8kV Contact, 15kV Air, Typical) for I/O Pin
DS28EC20: Typical Operating Circuit
DS28EC20: Typical Operating Circuit
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
DataSheet
titleDownload file
DS28EC20 Data SheetDS28EC20.pdf
Parametrics
Part NumberApplicationsMemory TypeMemory SizeBus TypePackage/PinsBudgetary
Price
See Notes
DS28EC20Medical Consumable ID
PCB ID and Authentication
Peripheral ID and Control
Print Cartridge Authentication
EEPROM20K x 11-WireTO92/3
TSOC/6
$1.51 @1k
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
DS28EC20+ActiveTO92,;3 pin;19.5 mm²-40°C to +85°CLead Free
DS28EC20+TActiveTO92,;3 pin;27.6 mm²-40°C to +85°CLead Free
DS28EC20P+ActiveTSOC,;6 pin;17.8 mm²-40°C to +85°CLead Free
DS28EC20P+TActiveTSOC,;6 pin;17.8 mm²-40°C to +85°CLead Free
DS28EC20.pdf DS28EC20
DS28EC20_cn.pdf DS28EC20
DS28EC20.pdf DS28EC20
DS28EC20.pdf DS28EC20
Understanding the DS1WM Synthesizable 1-Wire Bus Master DS1923
How to Build a 1-Wire® Evaluation Kit DS9490R
1-Wire File Structure DS1923
DS28EC20.pdf DS28EC20
DS28EC20_cn.pdf DS28EC20