TLV4021 datasheet(16/36 Pages) TI

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8.3 Feature Description

The TLV40x1 is a family of 4-pin, precision, low-power comparators with precision switching thresholds. The

TLV40x1 comparators feature a rail-to-rail input stage with factory programmed switching thresholds for both

rising and falling input waveforms. The comparator family also supports open-drain and push-pull output

configurations as well as non-inverting and inverting inputs.

8.4 Device Functional Modes

8.4.1 Power ON Reset (POR)

The TLV40x1 comparators have a Power-on-Reset (POR) circuit which provides system designers a known

start-up condition for the output of the comparators. When the power supply (VS) is ramping up or ramping down,

the POR circuit will be active when VS is below VPOR. For the TLV4021 and TLV4031, the POR circuit will force

the output to High-Z, and for the TLV4041 and TLV4051, the POR circuit will hold the output low at (V-). When

VS is greater than, or equal to, the minimum recommended operating voltage, the comparator output reflects the

state of the input (IN).

The following pictures represent how the TLV40x1 outputs respond for VS rising and falling. For the comparators

with open-drain outputs (TLV4021/4031), IN is connected to (V-) to highlight the transition from POR circuit

control to standard comparator operation where the output reflects the input condition. Note how the output goes

low when VS reaches 1.45V. Likewise, for the comparators with push-pull outputs (TLV4041/4051), the input is

connected to (V+). Note how the output goes high when VS reaches 1.45V.

Time (s)

-0.3 -0.2 -0.1

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

-0.5

0.5

1.5

2.5

3.5

4.5

VOUT

Figure 8-1. TLV4021/4031 Output for VS Rising

Time (s)

-0.05 -0.04 -0.03 -0.02 -0.01

0.01 0.02 0.03 0.04 0.05

-0.5

0.5

1.5

2.5

3.5

4.5

VOUT

Figure 8-2. TLV4021/4031 Output for VS Falling

Time (s)

-0.5

-0.4

-0.3

-0.2

-0.1

0.1

0.2

0.3

0.4

0.5

-0.5

0.5

1.5

2.5

3.5

4.5

5.5

VOUT

Figure 8-3. TLV4041/4051 Output for VS Rising

Time (s)

-0.05

-0.03

-0.01

0.01

0.03

0.05

-0.5

0.5

1.5

2.5

3.5

4.5

5.5

VOUT

Figure 8-4. TLV4041/4051 Output for VS Falling

TLV4021, TLV4031, TLV4041, TLV4051

SNVSB04C – MARCH 2019 – REVISED DECEMBER 2021

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