LMV7271_08 NSC [National Semiconductor], LMV7271_08 Datasheet

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LMV7271_08

Manufacturer Part Number
LMV7271_08
Description
Single & Dual, 1.8V Low Power Comparators with Rail-to-Rail Input
Manufacturer
NSC [National Semiconductor]
Datasheet
© 2008 National Semiconductor Corporation
LMV7271/LMV7275/LMV7272
Single & Dual, 1.8V Low Power Comparators with Rail-to-
Rail Input
General Description
The LMV727X are rail-to-rail input low power comparators,
which are characterized at supply voltage 1.8V, 2.7V and
5.0V. They consume only 9uA supply current per channel
while achieving a 800ns propagation delay.
The LMV7271/LMV7275 (single) are available in SC70 and
SOT23 packages. The LMV7272 (dual) is available in micro
SMD package. With these tiny packages, the PC board area
can be significantly reduced. They are ideal for low voltage,
low power and space critical designs.
The LMV7271/LMV7272 both feature a push-pull output
stage which allows operation with minimum power consump-
tion when driving a load. The LMV7275 features an open drain
output stage that allows for wired-OR configurations. The
open drain output also offers the advantage of allowing the
output to be pulled to any voltage up to 5.5V, regardless of
the supply voltage of the LMV7275.
The LMV727X are built with National Semiconductor's ad-
vance submicron silicon-gate BiCMOS process. They all
have bipolar inputs for improved noise performance and
CMOS outputs for rail-to-rail output swing.
Typical Circuit
FIGURE 1. Threshold Detector
200640
20064024
Features
(V
Applications
S
Single or Dual Supplies
Ultra low supply current
Low input bias current
Low input offset current
Low guaranteed V
Propagation delay
Input common mode voltage range
LMV7272 is available in micro SMD package
Mobile communications
Laptops and PDA's
Battery powered electronics
General purpose low voltage applications
Part Number
= 1.8V, T
LMV7271
LMV7272
LMV7275
A
= 25°C, Typical values unless specified).
OS
Single/
Single
Single
Dual
Dual
micro SMD
Package
SOT23
SOT23
SC70,
SC70,
880ns (20mV overdrive)
0.1V beyond rails
9µA per channel
Open Drain
www.national.com
May 15, 2008
Push/Pull
Push/Pull
Output
200pA
10nA
4mV

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LMV7271_08 Summary of contents

Page 1

LMV7271/LMV7275/LMV7272 Single & Dual, 1.8V Low Power Comparators with Rail-to- Rail Input General Description The LMV727X are rail-to-rail input low power comparators, which are characterized at supply voltage 1.8V, 2.7V and 5.0V. They consume only 9uA supply current per channel ...

Page 2

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. ESD Tolerance V Differential IN Supply Voltage ( − ) Voltage at Input/Output pins Soldering Information ...

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Electrical Characteristics Unless otherwise specified, all limits guaranteed for T extremes. Symbol Parameter V Input Offset Voltage Input Offset Temperature Drift OS I Input Bias Current B I Input offset Current OS I Supply Current S ...

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Symbol Parameter I Supply Current S I Output Short Circuit Current SC V Output Voltage High OH (LMV7271/LMV7272 only) V Output Voltage Low OL V Input Common Voltage Range CM CMRR Common Mode Rejection Ratio PRSS Power Supply Rejection Ratio ...

Page 5

Connection Diagrams 5-Pin SOT23/SC70 (LMV7271/LMV7275) Top View Ordering Information Package Part Number 5-Pin SOT23 LMV7271MF LMV7271MFX LMV7275MF LMV7275MFX 5-Pin SC70 LMV7271MG LMV7271MGX LMV7275MG LMV7275MGX 8-Bump micro LMV7272TL SMD LMV7272TLX 8-Bump micro SMD (LMV7272) 20064023 Package Marking C25A 1k Units Tape ...

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Typical Performance Characteristics Supply Current vs. Supply Voltage (LMV7271) www.national.com (T = 25°C, Unless otherwise specified 20064028 CM 20064030 Supply Current vs. Supply Voltage (LMV7272) 20064002 6 V vs. V ...

Page 7

Supply Current vs. Supply Voltage (LMV7272) Output Negative Swing vs. V SUPPLY Output Negative Swing vs. I SINK Output Positive Swing vs. V 20064032 Output Positive Swing vs. I 20064034 Output Positive Swing vs. I 20064036 7 SUPPLY 20064033 SOURCE ...

Page 8

Output Negative Swing vs. I Output Positive Swing vs. I Propagation Delay (t www.national.com Output Negative Swing vs. I SINK 20064038 SOURCE 20064040 ) PHL 20064018 8 SINK 20064039 Propagation Delay (t ) PLH 20064014 Propagation Delay (t ) PLH ...

Page 9

Propagation Delay (t ) PHL 20064020 Propagation Delay (t ) PHL 20064022 t vs. Overdrive PLH 20064049 Propagation Delay (t t vs. Overdrive PHL 9 ) PLH 20064016 20064050 www.national.com ...

Page 10

Application Notes BASIC COMPARATOR A comparator is often used to convert an analog signal to a digital signal. As shown in Figure 2, the comparator compares an input voltage ( reference voltage (V IN LMV7271 RAIL-TO-RAIL INPUT ...

Page 11

FIGURE 3. Inverting Comparator with Hysteresis Non-Inverting Comparator with Hysteresis A non-inverting comparator with hysteresis requires a two re- sistor network, and a voltage reference (V input (Figure 4). When V is low, the output is also low. For IN ...

Page 12

FIGURE 4. Non-Inverting Comparator with Hysteresis CIRCUIT TECHNIQUES FOR AVOIDING OSCILLATIONS IN COMPARATOR APPLICATIONS Feedback to almost any pin of a comparator can result in os- cillation. In addition, when the input signal is a slow voltage ramp or sine ...

Page 13

Typical Applications UNIVERSAL LOGIC LEVEL SHIFTER The output of LMV7275 is an unconnected drain of an NMOS device, which can be pulled up, through a resistor, to any de- sired output level within the permitted power supply range. Hence, the ...

Page 14

NEGATIVE PEAK DETECTOR For the negative detector, the output transistor of the com- parator acts as a low impedance current sink. Since there is no pull-up resistor, the only discharge path will be the 1MΩ resistor and any load impedance ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SOT-23 NS Package Number MF05A 5-Pin SC-70 NS Package Number MAA05A 15 www.national.com ...

Page 16

NOTE: UNLESS OTHERWISE SPECIFIED 1. EPOXY COATING 2. 63Sn/37Pb EUTECTIC BUMP 3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD. 4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION REMAINING PINS ARE NUMBERED COUNTERCLOCK- WISE. 5. XXX ...

Page 17

Notes 17 www.national.com ...

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