SM72375_14 datasheet(10/20 Pages) TI1

No. de pieza	SM72375

Descripción Electrónicos	SM72375 SolarMagic Dual Micropower Rail-To-Rail Input CMOS Comparator with Open Drain Output

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Fabricante Electrónico	TI1 [Texas Instruments]

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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 k

Ω 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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