19-4890 Rev 11/09 DS1977 Password-Protected 32KB EEPROM iButton iButton DESCRIPTION SPECIAL FEATURES The DS1977 is a 32KB EEPROM in a rugged, 32KB EEPROM Organized as Pages of 64 Bytes iButton enclosure. Access to the memory can be Each password-protected with different passwords for Optional Password Protection with Different 64- read-only and full access. Data is transferred serially Bit Passwords for Read and Full Access through the 1-Wire protocol, which requires only a Communicates to Host with a Single Digital single data lead and a ground return. Every DS1977 Signal at Up to 15.3kbps at Standard Speed or is factory lasered with a guaranteed unique 64-bit Up to 125kbps in Overdrive Mode Using 1-Wire registration number that allows for absolute Protocol traceability. The durable stainless-steel iButton Operating Range: 2.8V to 5.25V, -40 C to +85 C package is highly resistant to environmental hazards Minimum 100k Write Cycles Endurance such as dirt, moisture, and shock. Accessories permit 15kV Built-in ESD Protection the DS1977 iButton to be mounted on almost any COMMON iButton FEATURES object, including containers, pallets, and bags. Unique Factory-Lasered 64-Bit Registration Number Assures Error-Free Device Selection APPLICATIONS and Absolute Traceability Because No Two Parts Maintenance/Inspection Data Storage are Alike Medical Data Carrier Built-In Multidrop Controller for 1-Wire Net Health Data Carrier Chip-Based Data Carrier Stores Digital Audit Data Storage and Carrier Identification and Information, Armored in a Durable Stainless-Steel Case F5 MicroCAN Data can be Accessed While Affixed to Object Button Shape is Self-Aligning with Cup-Shaped Probes 5.89 Easily Affixed with Self-Stick Adhesive Backing, 0.51 Latched by its Flange, or Locked with a Ring Pressed onto its Rim Presence Detector Acknowledges when Reader 16.25 First Applies Voltage FC 37 17.35 ORDERING INFORMATION 000000FBC52B PART TEMP RANGE PACKAGE 1-Wire DS1977-F5 F5 iButton -40C to +85C Denotes a RoHS-compliant device that may include lead(Pb) that is exempt under the RoHS requirements. IO GND EXAMPLES OF ACCESSORIES PART DESCRIPTION DS9096P Self-Stick Adhesive Pad All dimensions are shown in millimeters. DS9101 Multipurpose Clip DS9093RA Mounting Lock Ring DS9093A Snap-In Fob DS9092 iButton Probe iButton and 1-Wire are registered trademarks of Maxim Integrated Products, Inc. 1 of 29 DS1977 PHYSICAL SPECIFICATION Size See mechanical drawing Weight DS1977 Ca. 3.3g ABSOLUTE MAXIMUM RATINGS I/O Voltage to GND -0.3V, +5.5V I/O Sink Current 20mA Junction Temperature +150C Storage Temperature Range -40C to +85C 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. ELECTRICAL CHARACTERISTICS (V = 2.8V to 5.25V, T = -40C to +85C.) PUP A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS I/O Pin General Data 1-Wire Pullup R (Notes 1, 2) 0.6 2.2 k PUP Resistance Input Capacitance C (Note 3) 5 nF IO Input Load Current I I/O pin at V 1 10 A L PUP High-to-Low Switching V (Notes 4, 5) 0.5 3.2 V TL Threshold Input Low Voltage V (Notes 1, 6) 0.30 V IL Low-to-High Switching V (Notes 4, 7) 0.7 3.4 V TH Threshold Switching Hysteresis V (Note 8) 0.15 N/A V HY Output-Low Voltage at V (Note 9) 0.4 V OL 4mA Standard speed, R = 2.2k PUP 5 (Note 1) Overdrive speed, R = 2.2k PUP 2 Recovery Time t (Note 1) s REC Overdrive speed, directly prior 5 to reset pulse R = 2.2k PUP (Note 1) Rising-Edge Hold-off Standard speed (Note 10) 0.5 5 t s REH Time Overdrive speed (Note 10) 0.5 2 Standard speed (Note 1) 65 Timeslot Duration t s SLOT Overdrive speed (Note 1) 8 I/O Pin, 1-Wire Reset, Presence Detect Cycle Standard speed (Note 1) 480 640 Reset Low Time t s RSTL Overdrive Speed (Note 1) 48 80 Presence Detect High Standard speed (Note 11) 15 60 t s PDH Time Overdrive speed (Note 11) 2.5 6.5 Standard speed, V > 4.5V PUP 1.5 5 Presence Detect Fall (Note 12) t s FPD Time Standard speed (Note 12) 1.5 8 Overdrive speed (Note 12) 0.15 1 Presence Detect Low Standard speed 60 240 t s PDL Time Overdrive speed 8 24 2 of 29