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MAX16043 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX16043 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 15 page Dual-/Triple-/Quad-Voltage, Capacitor- Adjustable, Sequencing/Supervisory Circuits _______________________________________________________________________________________ 9 Applications Information Tolerance The MAX16041/MAX16042/MAX16043 feature a pin- selectable threshold tolerance. Connect TOL to GND to select the thresholds 5% below the nominal value. Connect TOL to VCC to select the threshold tolerance 10% below the nominal voltage. Do not leave TOL uncon- nected. Adjustable Input These devices offer several monitoring options with both fixed and/or adjustable reset thresholds (see Table 2). For the adjustable threshold inputs, the threshold voltage (VTH) at each adjustable IN_ input is typically 0.5V (TOL = GND) or 0.472V (TOL = VCC). To monitor a voltage VINTH, connect a resistive divider network to the circuit as shown in Figure 3 and use the following equation to cal- culate the threshold voltage: Choosing the proper external resistors is a balance between accuracy and power use. The input to the volt- age monitor is a high-impedance input with a small 100nA leakage current. This leakage current contributes to the overall error of the threshold voltage where the out- put is asserted. This induced error is proportional to the value of the resistors used to set the threshold. With lower value resistors, this error is reduced, but the amount of power consumed in the resistors increases. VV R R INTH TH =× + ⎛ ⎝⎜ ⎞ ⎠⎟ 1 1 2 Figure 2. Timing Diagram (CDLY_ Open) VCC VTH VTH t < tON VUVLO tON tRP tDELAY- tDELAY+ tRST_DELAY tOFF tRP tRP tON IN_ EN_ OUT_ RESET |
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