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ISL88705IP846Z Datasheet(PDF) 6 Page - Intersil Corporation |
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ISL88705IP846Z Datasheet(HTML) 6 Page - Intersil Corporation |
6 / 14 page 6 FN8092.3 December 6, 2006 Principles of Operation The ISL88705 - ISL88813 devices provide those functions needed for monitoring critical voltages such as power-supply and battery functions in microprocessor systems. Features of these supervisors include Power On Reset control, Supply Voltage Supervision, Power-Fail Detection and Manual Reset Assertion. The integration of all these features along with high reset threshold accuracy and low power consumption make these devices ideal for portable or battery-powered equipment. Power-On Reset (POR) Applying power to the device activates a POR circuit which asserts reset (i.e. RST goes high while RST goes low). These signals provide several benefits: • It prevents the system microprocessor from starting to operate with insufficient voltage. • It prevents the processor from operating prior to stabilization of the oscillator. • It ensures that the monitored device is held out of operation until internal registers are properly loaded. • It allows time for an FPGA to download its configuration prior to initialization of the circuit. The reset signals remain active until VDD rises above the minimum voltage sense level for time period tPOR. This ensures that the supply voltage has stabilized to sufficient operating levels. MANUAL RESET VMRL MR Input Voltage Low 0.8 V VMRH MR Input Voltage High VDD-0.6 V tMR MR Minimum Pulse Width 550 ns RPU Internal MR Pull-Up Resistor 20 k Ω WATCHDOG TIMER (Note 4) tWDT Watchdog Time-out Period 1.0 1.6 2.0 s tWDPS WDI Minimum Pulse Width 100 ns VIL Watchdog Input Voltage Low 0.3 x VDD V VIH Watchdog Input Voltage High 0.7 x VDD V VWDOL WDO Output Voltage Low VDD ≥ 3.3V, Sinking 2.5mA 0.05 0.40 V VDD < 3.3V, Sinking 1.5mA 0.05 0.40 V VWDOH WDO Output Voltage High VDD ≥ 3.3V, Sourcing 2.5mA VDD-0.6 VDD-0.4 V VDD < 3.3V, Sourcing 1.5mA VDD-0.6 VDD-0.4 V IWDT Watchdog Input Current 1µA POWER-FAIL DETECTION VTHPFI PFI Input Threshold Voltage 1.20 1.25 1.30 V PFIVTHHYST Hysteresis Voltage 20 mV VPFOL PFO Output Voltage Low VDD ≥ 3.3V, Sinking 2.5mA 0.05 0.40 V VDD < 3.3V, Sinking 1.5mA 0.05 0.40 V VPFOH PFO Output Voltage High VDD ≥ 3.3V, Sourcing 2.5mA VDD-0.6 VDD-0.4 V VDD < 3.3V, Sourcing 1.5mA VDD-0.6 VDD-0.4 V NOTE: 4. Applies to ISL88705, ISL88706, ISL88716, and ISL88813. Electrical Specifications Over the recommended operating conditions unless otherwise specified. (Continued) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS ISL88705, ISL88706, ISL88707, ISL88708, 8SL88716, ISL88813 |
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