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DS28EC20 Datasheet(PDF) 1 Page - Dallas Semiconductor |
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DS28EC20 Datasheet(HTML) 1 Page - Dallas Semiconductor |
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1 / 24 page  DS28EC20 20Kb 1-Wire EEPROM 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 ORDERING INFORMATION PART TEMP RANGE PIN- PACKAGE DS28EC20+ -40°C to +85 °C 3 TO-92 DS28EC20+T -40°C to +85 °C 3 TO-92, T&R + Denotes a lead-free package. T = tape and reel TYPICAL OPERATING CIRCUIT PX.Y µC VCC I/O DS28EC20 GND RPUP (300Ω to 2.2k Ω) 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 IEC 1000-4-2 Level 4 ESD Protection (8kV Contact, 15kV Air, Typical) for I/O Pin PIN CONFIGURATION PIN 1 ---------- GND PIN 2 ---------- I/O PIN 3 ---------- N.C. DALLAS 28EC20 BOTTOM VIEW 1 2 3 1 2 3 FOR TAPE-AND- REEL THE LEADS ARE FORMED TO 100 MILS (2.54mm) SPACING VERSUS 50 MILS (1.27mm) FOR BULK. www.maxim-ic.com Commands, bytes, and modes are capitalized for clarity. 1-Wire is a registered trademark of Dallas Semiconductor Corp., a wholly owned subsidiary of Maxim Integrated products, Inc. 1 of 24 REV: 071007 |
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