The MAX912/MAX913 provide a TTL-compatible latch function （就是5脚）that holds the comparator output state .As long as Latch Enable (LE) is high or floating, the input signal has no effect on the output state. With LE low, the outputs are controlled by the input differential voltage and the latch is transparent.
A comparator can be thought of as having two sections;
an input amplifier and a logic interface. TheMAX912/MAX913’s input amplifier is fully differentialwith input offset voltage trimmed to below 2.0mV at+25°C. Input common-mode range extends from
200mV below the negative supply rail to 1.5V below the positive power supply. The total common-mode range is 8.7V when operating from ±5VDC supplies.
The MAX912/MAX913’s amplifier has no built-in hysteresis.For highest accuracy, do not add hysteresis.Figure 2 shows how hysteresis degrades resolution.
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