DS28EC20 20Kb 1-Wire EEPROM GENERAL DESCRIPTION FEATURES The DS28EC20 is a 20480-bit, 1-Wire EEPROM 20480 Bits of Nonvolatile (NV) EEPROM organized as 80 memory pages of 256 bits each. An Partitioned into Eighty 256-Bit Pages additional page is set aside for control functions. Individual 8-Page Groups of Memory Pages Data is written to a 32-byte scratchpad, verified, and (Blocks) can be Permanently Write Protected or then copied to the EEPROM memory. As a special Put in OTP EPROM-Emulation Mode Write to 0 ) feature, blocks of eight memory pages can be write Read and Write Access Highly Backward- protected or put in EPROM-Emulation mode, where Compatible to Legacy Devices (e.g., DS2433) bits can only be changed from a 1 to a 0 state. The 256-Bit Scratchpad with Strict Read/Write DS28EC20 communicates over the single-conductor Protocols Ensures Integrity of Data Transfer 1-Wire bus. The communication follows the standard 200k Write/Erase Cycle Endurance at +25C 1-Wire protocol. Each device has its own unalterable Unique Factory-Programmed 64-Bit Registration and unique 64-bit ROM registration number. The Number Ensures Error-Free Device Selection registration number is used to address the device in and Absolute Part Identity a multidrop 1-Wire net environment. Switchpoint Hysteresis and Filtering to Optimize Performance in the Presence of Noise APPLICATIONS Communicates to Host at 15.4kbps or 90kbps Device Authentication Using 1-Wire Protocol IEEE 1451.4 Sensor TEDS Low-Cost TO-92 Package Ink/Toner Cartridges Operating Range: 4V to 5.25V, -40C to +85C Medical Sensors Operating Range: 3.135V to3.465V, PCB Identification 0C to +70C (Standard Speed only) Wireless Base Stations IEC 1000-4-2 Level 4 ESD Protection ( 8kV Contact, 15kV Air, Typical) for I/O Pin ORDERING INFORMATION PART TEMP RANGE PIN-PACKAGE PIN CONFIGURATION DS28EC20+ -40C to +85 C 3 TO-92 DS28EC20+T 3 TO-92, T&R -40C to +85 C DS28EC20P+ 6 TSOC -40C to +85 C DS28EC20P+T 6 TSOC, T&R -40C to +85 C DS28EC20Q+T -40C to +85 C 6 TDFN, T&R +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. TYPICAL OPERATING CIRCUIT V CC R (300 PUP to 2.2k) PX.Y I/O DS28EC20 C GND Commands, bytes, and modes are capitalized for clarity. 1-Wire is a registered trademark of Maxim Integrated Products, Inc. 1 of 27 19-6067 Rev 8 6/21 DS28EC20: 20Kb 1-Wire EEPROM ABSOLUTE MAXIMUM RATINGS I/O Voltage to GND -0.5V, +6V I/O Sink Current 20mA Operating Temperature Range -40C to +85C Junction Temperature +150C Storage Temperature Range -55C to +125C Lead Temperature (soldering, 10s) +300C Soldering Temperature (reflow) TO-92 +250C TSOC, TDFN +260C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to the absolute maximum rating conditions for extended periods may affect device reliability. 5.0V SUPPLY ELECTRICAL CHARACTERISTICS (V = 4V to 5.25, T = -40C to +85C, unless otherwise noted.) (Note 1) PUP A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS I/O PIN GENERAL DATA 1-Wire Pullup Resistance R (Notes 2, 3) 0.3 2.2 k PUP Input Capacitance C (Notes 4, 5) 2000 pF IO Input Load Current I I/O pin at V 0.05 3.5 A L PUP High-to-Low Switching VPUP - V (Notes 5, 6, 7) 1.6 V TL Threshold 1.8 Input Low Voltage V (Notes 2, 8) 0.5 V IL Low-to-High Switching V - PUP V (Notes 5, 6, 9) 2.5 V TH Threshold 1.1 Switching Hysteresis V (Notes 5, 6, 10) 0.30 1.30 V HY Output Low Voltage V At 4mA (Note 11) 0.20 V OL Standard speed 5 Recovery Time t s REC (Notes 2, 12) Overdrive speed 5 Standard speed 0.5 5.0 Rising-Edge Hold-off Time t s REH (Notes 5, 13) Overdrive speed Not applicable (0) Standard speed 65 Timeslot Duration tSLOT s (Notes 2, 14) Overdrive speed 11 I/O PIN, 1-Wire RESET, PRESENCE DETECT CYCLE Standard speed 480 640 Reset-Low Time (Note 2) t s RSTL Overdrive speed 48 80 Standard speed 15 60 Presence-Detect High tPDH s Time Overdrive speed 2 6 Standard speed 60 240 Presence-Detect Low tPDL s Time Overdrive speed 8 24 Standard speed 60 75 Presence-Detect Sample t s MSP Time (Notes 2, 15) Overdrive speed 6 10 I/O PIN, 1-Wire WRITE Standard speed 60 120 Write-0 Low Time t s W0L (Notes 2, 16, 17) Overdrive speed 6 15.5 Standard speed 1 15 Write-1 Low Time tW1L s (Notes 2, 17) Overdrive speed 1 2 I/O PIN, 1-Wire READ Standard speed 5 15 - Read-Low Time t s RL (Notes 2, 18) Overdrive speed 0.800 2 - Standard speed 15 tRL + Read-Sample Time t s MSR (Notes 2, 18) Overdrive speed t + 2.27 RL 2 of 27