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 standard 1-Wire protocol. Each device has its own unalterable and unique 64-bit ROM registration number that is factory lasered into the chip. The registration number is used to address the device in a multidrop 1-Wire net environment.
APPLICATIONS
Device Authentication
IEEE 1451.4 Sensor TEDS
Ink/Toner Cartridges
Medical Sensors
PCB Identification
Wireless Base Stations
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 125kbps Using 1-Wire Protocol
?? Low-Cost TO-92 Package
?? Operating Range: 5V ±5%, -40°C to +85°C
?? Operating Range: 3.3V ±5%, 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
DS28EC20+ -40°C to +85°C 3 TO-92
DS28EC20+T -40°C to +85°C 3 TO-92, T&R
DS28EC20P+ -40°C to +85°C 6 TSOC
DS28EC20P+T -40°C to +85°C 6 TSOC, T&R
Click to view :
DS28EC20.pdf
