7.2.3 Application Curves

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

±1

0

1

2

3

4

5

6

-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

1

2

3

4

5

6

±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)

7.3 Power Supply Recommendations

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

capacitor on the supply pin to reject any variation on the supply voltage. This variation can distort the

comparator's input common mode range and create an inaccurate comparison.

7.4 Layout

7.4.1 Layout Guidelines

For accurate comparator applications without hysteresis, a stable supply is important to minimize noise and

glitches, which can affect the high level input common mode voltage range. To achieve this, add a bypass

capacitor between the supply voltage and ground. This must be implemented on the positive power supply and

negative supply (if available). If a negative supply is not being used, tie the GND pin directly to system ground.

7.4.2 Layout Example

OUT

1

IN–

2

IN+

3

4

V CC

5

0.1 F

μ

GND

0.1 F

μ

Ground

Bypass

Capacitor

Positive Supply

Negative Supply or Ground

Ground

Only needed

for dual power

supplies

Figure 7-4. TL331-Q1 Layout Example

www.ti.com

TL331-Q1, TL331B-Q1, TL391B-Q1

SLVS969H – OCTOBER 2009 – REVISED JANUARY 2025

Copyright © 2025 Texas Instruments Incorporated

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