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GENERAL 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 standard1-Wire protocol. Each device has its own unalterableand unique 64-bit ROM registration number. Theregistration number is used to address the device ina multidrop 1-Wire net environment.

FEATURES

?20480 Bits of Nonvolatile (NV) EEPROMPartitioned into Eighty 256-Bit Pages

?Individual 8-Page Groups of Memory Pages(Blocks) Can Be Permanently Write Protected orPut 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/WriteProtocols Ensures Integrity of Data Transfer

?200k Write/Erase Cycle Endurance at +25°C

?Unique, Factory-Programmed, 64-BitRegistration Number Ensures Error-Free DeviceSelection and Absolute Part Identity

?Switchpoint Hysteresis and Filtering to OptimizePerformance in the Presence of Noise

?Communicates to Host at 15.4kbps or 90kbpsUsing 1-Wire Protocol

?Low-Cost TO-92 Package

?Operating Range: 4V to 5.25V, -40°C to +85°C

?Operating Range: 3.135V to 3.465V,0°C to +70°C

?Enhanced ESD Protection

APPLICATIONS

Device Authentication

IEEE 1451.4 Sensor TEDS

Ink/Toner Cartridges

Medical Sensors

PCB Identification

Wireless Base Stations