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IMP183834A Datasheet(PDF) 4 Page - IMP, Inc |
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IMP183834A Datasheet(HTML) 4 Page - IMP, Inc |
4 / 8 page 4 408-432-9100/www.impweb.com © 1999 IMP, Inc. IMP1 IMP183 83 4/A/D 4/A/D Application Information Operation – Power Monitor The IMP1834 supervisors simultaneously detect out-of-tolerance power supply conditions on both 3.3V and 5V power supplies. If the voltages at 5VIN or 3.3VIN are outside the tolerance band, the reset for the failing supply voltage becomes active. When the moni- tored supply returns to an in-tolerance state, the reset remains active for approximately 350ms before returning to the inactive state. On power-up, the reset signals are kept active for approximately 350ms after the power supply voltages have reached the selected tolerance. This allows the power supply and microprocessor to stabilize before the reset is removed. All supply current for the IMP1834 devices is drawn from the input (5VIN or 3.3VIN) with the highest voltage level. The outputs draw current from their input supplies 5VIN and 3.3VIN. Reset Signal Polarity and Output Stage Structure The IMP1834 and IMP1834A supervisors have active LOW reset signals. The IMP1834D reset outputs are active HIGH. The IMP1834 and IMP1834D have CMOS push-pull output stages. The IMP1834A has open drain reset outputs. Output Stage IMP Part RESET Polarity Configuration IMP1834 LOW Push-Pull IMP1834EMA LOW Push-Pull IMP1834S LOW Push-Pull IMP1834A LOW Open Drain IMP1834AEMA LOW Open Drain IMP1834AS LOW Open Drain IMP1834D HIGH Push-Pull IMP1834DEMA HIGH Push-Pull IMP1834DS HIGH Push-Pull Trip Point Tolerance Selection The 3.3VTOL and 5VTOL inputs allow independent selection of the reset trip points. If 5VTOL is connected to the 5V supply input, a 10% tolerance is selected. If 5VTOL is grounded, a 5% tolerance is selected. If 3.3VTOL is connected to the 3.3V supply input, a 20% tolerance is selected. If 3.3VTOL is grounded, a 10% tolerance is selected. See Table 1. The 3.3VTOL and 5VTOL tolerance select inputs should be tied to ground or to the respective input supply voltage pin, 3.3VIN or 5VIN. Figure 1. Timing Diagram: Power Up Figure 2. Timing Diagram: Power Down (IMP1834D Only) 1834_10.eps VINTP (Max) VINTP VINTP (Min) VIN RESET RESET tR tRPU VOH VOL VINTP VINTP (Max) VINTP (Min) VIN RESET RESET > tRPD tF VOH VOL RESET Slews with VCC 1834_09.eps (IMP1834D Only) |
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