8.2.3 Application Curves

±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 8-2. 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 8-3. Response Time for Various Overdrives

(Negative Transition)

9 Power Supply Recommendations

For fast response and comparison applications with noisy or AC inputs, it is recommended to use a bypass

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

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

10 Layout

10.1 Layout Guidelines

For accurate comparator applications without hysteresis it is important maintain a stable power supply with

minimized noise and glitches, which can affect the high level input common mode voltage range. In order to

achieve this, it is best to add a bypass capacitor between the supply voltage and ground. This should 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.

10.2 Layout Example

OUT

1

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 10-1. TL331-Q1 Layout Example

TL331-Q1, TL331B-Q1, TL391B-Q1

SLVS969F – OCTOBER 2009 – REVISED JANUARY 2021

www.ti.com

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