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The MAX8215/MAX8216 contain 5 comparators (Figure 1). The comparator with its output labeled DOUT is dis- tinguished from the others in that it can be set up to mon- itor various voltages; each of the other 4 comparators monitors a specific voltage. The DOUT comparator's noninverting input is available external to the device; its inverting input is tied internally to the reference. The MAX8215/MAX8216 comparators have open-drain outputs. Thus, these devices require pull-up resistors for proper operation. See the Typical Operating Circuit. Open-drain outputs are useful for driving LEDs and for situations in which the comparator outputs must be connected together (i.e., wire-ORed).