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APPLICATION INFORMATION

Board Layout

V

IN–

V

IN+

V

OUT

0.01 µF

10 µF

R

PULLUP

(1)

10 k

Ω

V+

4

3

5

REF

2

V-

1

6

TLV301x

(1) Use R

with the TLV3011 only.

PULLUP

Open-Drain Output (TLV3011)

External Hysteresis

V

=

HYST

V+ × R

1

R + R

1

2

TLV3011-EP, TLV3012-EP

SGLS349 – OCTOBER 2006

The TLV3011 is a low-power, open-drain comparator with on-chip 1.242-V series reference. The open-drain

output allows multiple devices to be driven by a single pullup resistor to accomplish an OR function, making the

TLV3011 useful for logic applications.

The TLV3012 comparator with on-chip 1.242-V series reference has a push-pull output stage optimal for

reduced power budget applications and features no shoot-through current.

A typical supply current of 2.8

µA and small packaging combine with 1.8-V supply requirements to make the

TLV3011 and TLV3012 optimal for battery and portable designs.

Typical connections for the TLV3011 and TLV3012 are shown in Figure 22. The TLV3011 is an open-drain

output device. A pullup resistor must be connected between the comparator output and supply to enable

operation.

To minimize supply noise, power supplies should be capacitively decoupled by a 0.01-

µF ceramic capacitor in

parallel with a 1-

µF electrolytic capacitor. Comparators are sensitive to input noise and precautions such as

proper grounding (use of ground plane), supply bypassing, and guarding of high-impedance nodes minimize the

effects of noise and help to ensure specified performance.

Figure 22. Basic Connections of the TLV3011 and TLV3012

The open-drain output of the TLV3011 is useful in logic applications. The value of the pullup resistor and supply

voltage used affects current consumption due to additional current drawn when the output is in a low state. This

effect can be seen in Figure 3.

Comparator inputs have no noise immunity within the range of specified offset voltage (

±12 mV). For noisy input

signals, the comparator output may display multiple switching as input signals move through the switching

threshold. The typical comparator threshold of the TLV3011 and TLV3012 is

±0.5 mV. To prevent multiple

switching within the comparator threshold of the TLV3011 or TLV3012, external hysteresis may be added by

connecting a small amount of feedback to the positive input. Figure 23 shows a typical topology used to

introduce hysteresis, described by this equation:

8

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