LM339LVDR datasheet(33/63 Pages) TI1

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9 Power Supply Recommendations

Due to the fast output edges, it is critical to have bypass capacitors on the supply pin to prevent supply ringing

and false triggers and oscillations. Bypass the supply directly at each device with a low ESR 0.1 µF ceramic

bypass capacitor directly between VCC pin and ground pins. Narrow, peak currents will be drawn during the

output transition time, particularly for the push-pull output device. These narrow pulses can cause un-bypassed

supply lines and poor grounds to ring, possibly causing variation that can eat into the input voltage range and

create an inaccurate comparison or even oscillations.

The device may also be powered from "split" supplies (V+, V- and GND), with V- applied to the GND pin.

Input signals must stay within the specified input range (between V+ and V-) for both supply types.

Note that the ouptut will now swing "low" (VOL) to V- potential and not system GND on split supplies.

10 Layout

10.1 Layout Guidelines

For accurate comparator applications it is important maintain a stable power supply with minimized noise and

glitches. Output rise and fall times are in the tens of nanoseconds, and should be treated as high speed logic

devices. The bypass capacitor should be as close to the supply pin as possible and connected to a solid ground

plane, and preferably directly between the VCC and GND pins.

Minimize coupling between outputs and inputs to prevent output oscillations. Do not run output and input traces

in parallel unless there is a VCC or GND trace between output to reduce coupling. When series resistance is

added to inputs, place resistor close to the device. A low value (<100 ohms) resistor may also be added in series

with the output to dampen any ringing or reflections on long, non-impedance controlled traces. For best edge

shapes, controlled impedance traces with back-terminations should be used when routing long distances.

10.2 Layout Example

VCC

Ground

1IN-

1IN+

GND

2OUT

2IN-

2IN+

1OUT

VCC

VCC or GND

Better

Input Resistors

Close to device

Figure 10-1. Dual Layout Example

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TL331LV, TL391LV, LM393LV, LM339LV

SNOSDA4C – JUNE 2020 – REVISED MARCH 2023

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