20Kb 1-Wire EEPROM

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.

Applications

* 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

* 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