Datasheet
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APPLICATION INFORMATION
Board Layout
V
IN–
V
IN+
V
OUT
0.01 µF
10 µF
R
PULLUP
(1)
10 kΩ
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 µ A 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- µ F ceramic capacitor in
parallel with a 1- µ F 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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