LM339LVDR datasheet(30/71 Pages) TI2

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VCC

Logic

Out

VLOGIC

RPULLUP

VLOGIC

Logic

10 kŸ

VCC

Open

Drain

Output

Figure 7-14. Universal Logic Level Shifter

The two 10 kΩ resistors bias the input to half of the input logic supply level to set the threshold in the mid-point

of the input logic levels. Only one shared output pull-up resistor is needed and may be connected to any pull-up

voltage between 0 V and 5.5 V. The pullup voltage should match the driven logic input "high" level.

7.2.6 One-Shot Multivibrator

1 0Ÿ

1N4148

100 pF

1N4148

+VIN

RPULLUP

Figure 7-15. One-Shot Multivibrator

A monostable multivibrator has one stable state in which it can remain indefinitely. It can be triggered externally

to another quasi-stable state. A monostable multivibrator can thus be used to generate a pulse of desired width.

The desired pulse width is set by adjusting the values of C2 and R4. The resistor divider of R1 and R2 can be

used to determine the magnitude of the input trigger pulse. The output will change state when V1 < V2. Diode

D2 provides a rapid discharge path for capacitor C2 to reset at the end of the pulse. The diode also prevents the

non-inverting input from being driven below ground.

7.2.7 Bi-Stable Multivibrator

100 NŸ

SET

100 NŸ

RESET

50 NŸ

RPU

4.7 NŸ

Figure 7-16. Bi-Stable Multivibrator

A bi-stable multivibrator has two stable states. The reference voltage is set up by the voltage divider of R2 and

R3. A pulse applied to the SET terminal will switch the output of the comparator high. The resistor divider of R1,

R4, and R5 now clamps the non-inverting input to a voltage greater than the reference voltage. A pulse applied to

RESET will now toggle the output low.

TL331LV, TL391LV, LM393LV, LM339LV

SNOSDA4D – JUNE 2020 – REVISED NOVEMBER 2023

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