DS28E02 ABRIDGED DATA SHEET 219-0008 Rev 1 3/12 1-Wire SHA-1 Authenticated 1Kb EEPROM with 1.8V Operation General Description Features The DS28E02 combines 1024 bits of EEPROM with 1024 Bits of EEPROM Memory Partitioned Into challenge-and-response authentication security imple- Four Pages of 256 Bits mented with the FIPS 180-3 Secure Hash Algorithm On-Chip 512-Bit SHA-1 Engine to Compute 160- (SHA-1). The 1024-bit EEPROM array is configured as Bit Message Authentication Codes (MACs) and to four pages of 256 bits with a 64-bit scratchpad to per- Generate Secrets form write operations. All memory pages can be write protected, and one page can be put in EPROM-emula- Write Access Requires Knowledge of the Secret tion mode, where bits can only be changed from a 1 to and the Capability of Computing and Transmitting a 0 state. Each DS28E02 has its own guaranteed a 160-Bit MAC as Authorization unique 64-bit ROM registration number that is factory User-Programmable Page Write Protection for installed into the chip. The DS28E02 communicates Page 0, Page 3, or All Four Pages Together over the single-contact 1-Wire bus. The communica- tion follows the standard 1-Wire protocol with the regis- User-Programmable OTP EPROM Emulation Mode tration number acting as the node address in the case for Page 1 (Write to 0) of a multidevice 1-Wire network. Communicates to Host with a Single Digital Signal at 12.5kbps or 35.7kbps Using 1-Wire Applications Protocol Reference Design License Management Switchpoint Hysteresis and Filtering to Optimize System Intellectual Property Protection Communication Performance in the Presence of Noise Sensor/Accessory Authentication and Calibration Reads and Writes Over 1.75V to 3.65V Voltage Medical Consumable Authentication Range from -20C to +85C Printer Cartridge Configuration and Monitoring 6-Lead TSOC and TDFN Packages Typical Operating Circuit Ordering Information PART TEMP RANGE PIN-PACKAGE V CC DS28E02P+ -20C to +85C 6 TSOC DS28E02P+T&R -20C to +85C 6 TSOC R PUP 6 TDFN-EP* DS28E02Q+T&R -20C to +85C IO (2.5k pcs) +Denotes a lead(Pb)-free/RoHS-compliant package. C DS28E02 T&R = Tape and reel. *EP = Exposed pad. GND 1-Wire is a registered trademark of Maxim Integrated Products, Inc. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.ABRIDGED DATA SHEET 1-Wire SHA-1 Authenticated 1Kb EEPROM with 1.8V Operation ABSOLUTE MAXIMUM RATINGS IO Voltage Range to GND .......................................-0.5V to +4V Junction Temperature......................................................+150C IO Sink Current ...................................................................20mA Storage Temperature Range .............................-55C to +125C Operating Temperature Range ...........................-20C to +85C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+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 absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (T = -20C to +85C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS IO PIN: GENERAL DATA 1-Wire Pullup Voltage V (Note 2) 1.75 3.65 V PUP 1-Wire Pullup Resistance R (Notes 2, 3) 300 750 PUP Input Capacitance C (Notes 4, 5) 1500 pF IO Input Load Current I IO pin at V 0.05 5 A L PUP V PUP High-to-Low Switching Threshold V (Notes 5, 6, 7) 0.4 V TL 0.89 Input Low Voltage V (Notes 2, 8) 0.30 V IL V PUP Low-to-High Switching Threshold V (Notes 5, 6, 9) 0.74 V TH 0.49 Switching Hysteresis V (Notes 5, 6, 10) 0.26 1.02 V HY Output Low Voltage V At 4mA current load (Note 11) 0.4 V OL Standard speed, RPUP = 750 20 Recovery Time (Notes 2, 12) t s REC Overdrive speed 20 Standard speed 80 Time Slot Duration (Notes 2, 13) t s SLOT Overdrive speed 28 IO PIN: 1-Wire RESET, PRESENCE-DETECT CYCLE Standard speed 480 640 Reset Low Time (Note 2) t s RSTL Overdrive speed 50 80 Standard speed 480 Reset High Time (Note 14) t s RSTH Overdrive speed 48 Presence-Detect Sample Time Standard speed 60 72 t s MSP (Notes 2, 15) Overdrive speed 7 10 IO PIN: 1-Wire WRITE Standard speed 60 120 Write-Zero Low Time (Notes 2, 16) t s W0L Overdrive speed 8 15.5 Standard speed 1 15 Write-One Low Time (Notes 2, 16) t s W1L Overdrive speed 1 2 IO PIN: 1-Wire READ Standard speed 5 15 - Read Low Time (Notes 2, 17) t s RL Overdrive speed 1 2 - Standard speed t + 15 RL Read Sample Time (Notes 2, 17) t s MSR Overdrive speed t + 2 RL EEPROM IO voltage < 3.65V 3.5 Programming Current I IO voltage < 2.95V 2.5 mA PROG (Notes 5, 18) IO voltage = 1.75V 1.0 2 DS28E02