LM393DGKR.A datasheet(20/56 Pages) TI2

20 / 56 page

7.2.3 Application Curves

The following curves are generated with 5V on VCC and VLogic, RPULLUP = 5.1kΩ, and 50pF scope probe.

±1

-0.25

0.25

0.75

1.25

1.75

2.25

Time (usec)

5mV OD

20mV OD

100mV OD

C004

Figure 7-2. Response Time for Various Overdrives

(Positive Transition)

±1

±0.25 0.00

0.25

0.50

0.75

1.00

1.25

1.50

1.75

2.00

Time (usec)

5mV OD

20mV OD

100mV OD

C006

Figure 7-3. Response Time for Various Overdrives

(Negative Transition)

7.2.4 Power Supply Recommendations

For fast response and comparison applications with noisy or AC inputs, TI recommends to use a bypass

capacitor on the supply pin to reject any variation on the supply voltage. This variation can eat into the input

common-mode range of the comparator and create an inaccurate comparison.

7.2.5 Layout

7.2.5.1 Layout Guidelines

For accurate comparator applications without hysteresis maintaining a stable power supply with minimized noise

and glitches is critical. Best practice is to add a bypass capacitor between the supply voltage and ground. This

can be implemented on the positive power supply and negative supply (if available). If a negative supply is not

being used, do not put a capacitor between the IC's GND pin and system ground.

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

inverting input traces in parallel unless there is a VCC or GND trace between output and inverting input traces to

reduce coupling. When series resistance is added to inputs, place resistor close to the device.

7.2.5.2 Layout Example

VCC

Ground

1IN-

1IN+

GND

2OUT

2IN-

2IN+

1OUT

VCC

VCC or GND

Better

Input Resistors

Close to device

Figure 7-4. LM2903 Layout Example

LM393B, LM2903B, LM193, LM293, LM293A, LM393, LM393A, LM2903, LM2903V

SLCS005AH – OCTOBER 1979 – REVISED APRIL 2025

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