SM72375_14 Datasheet, PDF (10/20 Pages) Texas Instruments – SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output

SM72375
SNIS155D – NOVEMBER 2010 – REVISED APRIL 2013
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3.0 OUTPUT SHORT CIRCUIT CURRENT
The SM72375 has short circuit protection of 40 mA. However, it is not designed to withstand continuous short
circuits, transient voltage or current spikes, or shorts to any voltage beyond the supplies. A resistor is series with
the output should reduce the effect of shorts. For outputs which send signals off PC boards additional protection
devices, such as diodes to the supply rails, and varistors may be used.
4.0 HYSTERESIS
If the input signal is very noisy, the comparator output might trip several times as the input signal repeatedly
passes through the threshold. This problem can be addressed by making use of hysteresis as shown below.
Figure 25. Canceling the Effect of Input Capacitance
The capacitor added across the feedback resistor increases the switching speed and provides more short term
hysteresis. This can result in greater noise immunity for the circuit.
Typical Applications
UNIVERSAL LOGIC LEVEL SHIFTER
The output of the SM72375 is the uncommitted drain of the output NMOS transistor. Many drains can be tied
together to provide an output OR'ing function. An output pullup resistor can be connected to any available power
supply voltage within the permitted power supply range.
Figure 26. Universal Logic Level Shifter
The two 1 kΩ resistors bias the input to half of the power supply voltage. The pull-up resistor should go to the
output logic supply. Due to its wide operating range, the SM72375 is ideal for the logic level shifting applications.
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