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MAX6887PETE Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX6887PETE Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 13 page Hex/Quad, Power-Supply Supervisory Circuits 8 _______________________________________________________________________________________ detector input (IN1–IN6) to monitor a user-defined sup- ply voltage: where VMON is the desired voltage to be monitored. Use the following procedure to design the proper volt- age-divider and calculate thresholds: 1) Pick a value for R2. Use the equation above with the desired supply voltage to be monitored and solve for R1. Use high-value resistors R1 and R2 to minimize current consumption due to low leakage currents. 2) To find the actual undervoltage and overvoltage thresholds, use the following equations: VREFUV and VREFOV are the undervoltage and overvolt- age thresholds listed in Tables 1 and 2 that allow adjustable thresholds. Their values are based on toler- ances of ±7.5% and ±12.5% from a 0.6V reference. See the Selector Guide to find which thresholds in Tables 1 and 2 are adjustable. Manual Reset ( MR) Many µP-based products require manual reset capability to allow an operator or external logic circuitry to initiate a reset. The manual reset input (MR) can be connected directly to a switch without an external pullup resistor or debouncing network. MR is internally pulled up to BP. Leave unconnected if not used. MR is internally pulled up to BP through a 10µA current source. MR is designed to reject fast, falling transients (typically 100ns pulses) and MR must be held low for a minimum of 1µs to assert RESET. Connect a 0.1µF capacitor from MR to ground to provide additional noise immunity. After MR transitions from low to high, RESET remains asserted for the dura- tion of its time delay. Margin Output Disable ( MARGIN) MARGIN allows system-level testing while power sup- plies exceed the normal operating ranges. Drive MARGIN low to hold RESET, OV, and WDO in their VV V V VV V V ACTUALUV MON REFUV ACTUALOV MON REFOV =× ⎛ ⎝⎜ ⎞ ⎠⎟ =× ⎛ ⎝⎜ ⎞ ⎠⎟ 06 06 . . 06 2 12 .V V R RR MON =× + ⎛ ⎝⎜ ⎞ ⎠⎟ Table 1. MAX6887 Threshold Options UV THRESHOLDS (V) OV THRESHOLDS (V) PART IN1 IN2 IN3 IN4 IN5 IN6 IN1 IN2 IN3 IN4 IN5 IN6 MAX6887AETE 4.620 3.060 2.310 1.670 0.557 0.557 5.360 3.540 2.680 1.930 0.643 0.643 MAX6887BETE 4.620 3.060 2.310 0.557 0.557 0.557 5.360 3.540 2.680 0.643 0.643 0.643 MAX6887CETE 4.620 3.060 1.670 0.557 0.557 0.557 5.360 3.540 1.930 0.643 0.643 0.643 MAX6887DETE 3.060 2.310 1.670 1.390 0.557 0.557 3.540 2.680 1.930 1.610 0.643 0.643 MAX6887EETE 3.060 2.310 1.670 0.557 0.557 0.557 3.540 2.680 1.930 0.643 0.643 0.643 MAX6887FETE 3.060 2.310 1.390 0.557 0.557 0.557 3.540 2.680 1.610 0.643 0.643 0.643 MAX6887GETE 3.060 2.310 0.557 0.557 0.557 0.557 3.540 2.680 0.643 0.643 0.643 0.643 MAX6887HETE 3.060 1.670 0.557 0.557 0.557 0.557 3.540 1.930 0.643 0.643 0.643 0.643 MAX6887QETE 0.557 0.557 0.557 0.557 0.557 0.557 0.643 0.643 0.643 0.643 0.643 0.643 MAX6887IETE 4.380 2.880 2.190 1.580 0.527 0.527 5.620 3.700 2.810 2.020 0.673 0.673 MAX6887JETE 4.380 2.880 2.190 0.527 0.557 0.557 5.620 3.700 2.810 0.673 0.673 0.673 MAX6887KETE 4.380 2.880 1.580 0.527 0.557 0.557 5.620 3.700 2.020 0.673 0.673 0.673 MAX6887LETE 2.880 2.190 1.580 1.310 0.557 0.557 3.700 2.810 2.020 1.680 0.673 0.673 MAX6887METE 2.880 2.190 1.580 0.527 0.557 0.557 3.700 2.810 2.020 0.673 0.673 0.673 MAX6887NETE 2.880 2.190 1.310 0.527 0.557 0.557 3.700 2.810 1.680 0.673 0.673 0.673 MAX6887OETE 2.880 2.190 0.527 0.527 0.557 0.557 3.700 2.810 0.673 0.673 0.673 0.673 MAX6887PETE 2.880 1.580 0.527 0.527 0.557 0.557 3.700 2.020 0.673 0.673 0.673 0.673 MAX6887RETE 0.527 0.527 0.527 0.527 0.527 0.527 0.673 0.673 0.673 0.673 0.673 0.673 |
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