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DS1977 Datasheet(PDF) 2 Page - Maxim Integrated Products |
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DS1977 Datasheet(HTML) 2 Page - Maxim Integrated Products |
2 / 29 page DS1977 2 of 29 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 +150°C Storage Temperature Range -40°C to +85°C 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 (VPUP = 2.8V to 5.25V, TA = -40°C to +85°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS I/O Pin General Data 1-Wire Pullup Resistance RPUP (Notes 1, 2) 0.6 2.2 k Input Capacitance CIO (Note 3) 5 nF Input Load Current IL I/O pin at VPUP 1 10 µA High-to-Low Switching Threshold VTL (Notes 4, 5) 0.5 3.2 V Input Low Voltage VIL (Notes 1, 6) 0.30 V Low-to-High Switching Threshold VTH (Notes 4, 7) 0.7 3.4 V Switching Hysteresis VHY (Note 8) 0.15 N/A V Output-Low Voltage at 4mA VOL (Note 9) 0.4 V Standard speed, RPUP= 2.2k (Note 1) 5 Overdrive speed, RPUP= 2.2k (Note 1) 2 Recovery Time tREC Overdrive speed, directly prior to reset pulse; RPUP= 2.2k (Note 1) 5 µs Standard speed (Note 10) 0.5 5 Rising-Edge Hold-off Time tREH Overdrive speed (Note 10) 0.5 2 µs Standard speed (Note 1) 65 Timeslot Duration tSLOT Overdrive speed (Note 1) 8 µs I/O Pin, 1-Wire Reset, Presence Detect Cycle Standard speed (Note 1) 480 640 Reset Low Time tRSTL Overdrive Speed (Note 1) 48 80 µs Standard speed (Note 11) 15 60 Presence Detect High Time tPDH Overdrive speed (Note 11) 2.5 6.5 µs Standard speed, VPUP > 4.5V (Note 12) 1.5 5 Standard speed (Note 12) 1.5 8 Presence Detect Fall Time tFPD Overdrive speed (Note 12) 0.15 1 µs Standard speed 60 240 Presence Detect Low Time tPDL Overdrive speed 8 24 µs |
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