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VA1

R3*

VO High

+VCC

* R3 = R3 + RPU

VA2

VO Low

+VCC

Figure 8-4. Inverting Configuration Resistor Equivalent Networks

When VIN is less than VA, the output voltage is high (for simplicity, assume VO switches as high as VCC). The

three network resistors can be represented as R1 || R3 in series with R2, as shown in Figure 8-4.

Equation 1 below defines the high-to-low trip voltage (VA1).

= V

(R1 || R3) + R2

(1)

When VIN is greater than VA, the output voltage is low. In this case, the three network resistors can be presented

as R2 || R3 in series with R1, as shown in Equation 2.

Use Equation 2 to define the low to high trip voltage (VA2).

= V

R2 || R3

R1 + (R2 || R3)

(2)

Equation 3 defines the total hysteresis provided by the network.

V = V

(3)

8.1.2.2 Non-Inverting Comparator With Hysteresis

A noninverting comparator with hysteresis requires a two-resistor network and a voltage reference (VREF) at the

inverting input, as shown in Figure 8-5,

+VCC

+5 V

VREF 2.5 V

1 0Ÿ

330 NŸ

RPU

5 V

0 V

VIN2

VIN1

1.675 V

3.325 V

VIN

Figure 8-5. Non-Inverting Configuration With Hysteresis

The equivalent resistor networks when the output is high and low are shown in Figure 8-6 Note that RPU should

be considered in series with R2 when the output is high. RPU should be at least 10x less than R2.

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LM393LV, LM339LV

SNOSDA4B – JUNE 2020 – REVISED DECEMBER 2020

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