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产品型号LMC7215IM5X的概述

LMC7215IM5X芯片概述 LMC7215IM5X是一款高精度电压比较器，由德州仪器（Texas Instruments, TI）生产。它是一种单电源或双电源操作的比较器，具有低功耗、高速度和高确定性，使其适用于多种应用场景。LMC7215IM5X的设计目标是提供高达300毫微秒的响应时间，适用于需要快速转换的系统中，如数据采集、信号调理及其他相关的电子系统。该芯片的工作电压范围宽广，通常在3V到15V之间，这使得其能轻松适应各种电源配置。其“过零”检测功能是其一大亮点，能够快速监测和响应输入信号的变化，从而提高系统的反应速度。这种特性使其在自动控制系统、通信设备和其他数字逻辑电路上颇具优势。详细参数 | 参数 | 描述 | |-------------------|--------------...

产品型号LMC7215IM5X的Datasheet PDF文件预览

September 1999

LMC7215/LMC7225

Micro-Power, Rail-to-Rail CMOS Comparators with

™

Open-Drain/Push-Pull Outputs and TinyPak Package

General Description

Features

The LMC7215/LMC7225 are ultra low power comparators

with a maximum of 1 µA power supply current. They are de-

signed to operate over a wide range of supply voltages, from

2V to 8V.

(Typical unless otherwise noted)

n Ultra low power consumption 0.7 µA

n Wide range of supply voltages 2V to 8V

n Input common-mode range beyond V+ and V−

n Open collector and push-pull output

n High output current drive: ( V_S5V) 45 mA

n Propagation delay ( V_S5V, 10 mV overdrive) 25 µs

n Tiny SOT23-5 package

The LMC7215/LMC7225 have a greater than rail-to-rail com-

mon mode voltage range. This is a real advantage in single

supply applications.

The LMC7215 features a push-pull output stage. This fea-

ture allows operation with absolute minimum amount of

power consumption when driving any load.

n Latch-up resistance 300 mA

The LMC7225 features an open drain output. By connecting

an external resistor, the output of the comparator can be

used as a level shifter to any desired voltage to as high as

15V.

Applications

n Laptop computers

n Mobile phones

n Metering systems

n Hand-held electronics

n RC timers

n Alarm and monitoring circuits

n Window comparators, multivibrators

The LMC7215/LMC7225 are designed for systems where

low power consumption is the critical parameter.

Guaranteed operation over the full supply voltage range of

2.7V to 5V and rail-to-rail performance makes this compara-

tor ideal for battery-powered applications.

Connection Diagrams

8–Pin SO–8

5–Pin SOT23-5

DS012853-2

Top View

DS012853-1

Top View

™

TinyPak is a trademark of National Semiconductor Corporation.

DS012853

www.national.com

Ordering Information

Package

Ordering

NSC Drawing

Number

Package

Marking

Supplied As

Information

LMC7215IM5

LMC7225IM5

LMC7215IM5X

LMC7225IM5X

LMC7215IM

5-Pin SOT 23-5

8-Pin SO-8

MA05A

C02B

1k Tape and Reel

3k Tape and Reel

Rails

MA05A

M08A

C03B

C02B

C03B

LMC7215IM

LMC7225IM

LMC7215IM

LMC7225IM

8-Pin SO-8

LMC7225IM

M08A

Rails

8-Pin SO-8

LMC7215IMX

LMC7225IMX

M08A

2.5k Tape and Reel

8-Pin SO-8

M08A

www.national.com

Absolute Maximum Ratings (Note 1)

If Military/Aerospace specified devices are required,

please contact the National Semiconductor Sales Office/

Distributors for availability and specifications.

(soldering, 10 sec)

260˚C

−65˚C to +150˚C

150˚C

Storage Temperature Range

Junction Temperature (Note 4)

Operating Ratings(Note 1)

ESD Tolerance (Note 2)

Differential Input Voltage

Voltage at Input/Output Pin

Supply Voltage (V⁺–V⁻)

Current at Input Pin

2 kV

(V_CC)+0.3V to (−V_CC)−0.3V

10V

Supply Voltage

2V ≤ V_CC≤ 8V

Junction Temperature Range

LMC7215IM, LMC7225IM

−40˚C ≤ T_J≤ +85˚C

5 mA

Thermal Resistance (θ_JA

)

Current at Output Pin (Note 3)

Current at Power Supply Pin

Lead Temperature

30 mA

40 mA

M Package, 8-Pin Surface Mount

SOT23-5 Package

165˚C/W

325˚C/W

2.7V to 5V Electrical Characteristics

−

= = =

0V, V_CMV_OV+/2. Boldface limits

Unless otherwise specified, all limits guaranteed for T_J25˚C, V

2.7V to 5V, V

apply at the temperature extremes.

Typ

LMC7215

LMC7225

Symbol

V_OS

Parameter

Conditions

(Note 5)

Limit

Units

(Note 6)

Input Offset Voltage

max

TCV_OS

Input Offset Voltage

Average Drift

µV/˚C

I_B

Input Current

I_OS

Input Offset Current

Common Mode

Rejection Ratio

Power Supply

CMRR

(Note 7)

min

V⁺2.2V to 8V

PSRR

Rejection Ratio

Voltage Gain

A_V

140

3.0

V⁺2.7V

2.9

2.7

0.0

0.2

5.2

5.0

−0.2

0.0

1.8

1.7

2.3

2.2

4.6

4.5

0.4

0.5

0.4

0.5

0.4

0.5

2.9

2.7

0.0

0.2

5.2

5.0

−0.2

0.0

CMVR

Input Common-Mode

Voltage Range

CMRR 50 dB

min

V⁺2.7V

−0.2

5.3

CMRR 50 dB

max

V⁺5.0V

CMRR 50 dB

min

V⁺5.0V

−0.3

2.05

4.8

CMRR 50 dB

max

V⁺2.2V

V_OH

Output Voltage High

I_OH1.5 mA

min

V⁺2.7V

I_OH2.0 mA

min

V⁺5.0V

I_OH4.0 mA

min

V⁺2.2V

0.17

0.2

0.4

0.5

0.4

0.5

0.4

0.5

V_OL

Output Voltage Low

I_OH1.5 mA

max

V⁺2.7V

I_OH2.0 mA

max

V⁺5.0V

I_OH4.0 mA

max

V⁺2.7V, Sourcing

I_SC+

Output Short Circuit

Current (Note 10)

Output Short Circuit

V⁺5.0V, Sourcing

V⁺2.7V, Sinking

I_SC−

www.national.com

2.7V to 5V Electrical Characteristics (Continued)

−

= = =

0V, V_CMV_OV+/2. Boldface limits

Unless otherwise specified, all limits guaranteed for T_J25˚C, V

2.7V to 5V, V

apply at the temperature extremes.

Typ

LMC7215

Limit

LMC7225

Limit

Symbol

I_Leakage

I_S

Parameter

Conditions

(Note 5)

Units

(Note 6)

V⁺5.0V, Sinking

V⁺2.2V

0.01

0.7

Current (Note 10)

Output Leakage Current

0V,

V_IN

0.1V, V_IN

−

500

max

V_OUT15V

V⁺5.0V

µA

Supply Current

V_IN+

5V, V_IN

−

1.2

max

AC Electrical Characteristics

−

= =

0V, V_CMV /2

Unless otherwise specified, T_J25˚C, V

5V, V

LMC7215

LMC7225

Symbol

Parameter

Rise Time

Conditions

Overdrive 10 mV (Note 8)

Typ

(Note 5)

Typ

Units

(Notes 5, 8)

t_rise

t_fall

12.2

0.35

µs

Fall Time

Overdrive 10 mV (Note 8)

0.4

t_PHL

Propagation Delay

(High to Low)

(Notes 8, 9)

Overdrive = 10 mV

Overdrive = 100 mV

Overdrive = 10 mV

Overdrive = 100 mV

Overdrive = 10 mV

Overdrive = 100 mV

Overdrive = 10 mV

Overdrive = 100 mV

V⁺2.7V

µs

(Notes 8, 9)

t_PLH

Propagation Delay

(Low to High)

V⁺2.7V

(Notes 8, 9)

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is in-

tended to be functional, but specific performance is not guaranteed. For guaranteed specifications and the test conditions, see the Electrical Characteristics.

Note 2: Human body model, 1.5 kΩ in series with 100 pF.

Note 3: Applies to both single-supply and split-supply operation. Continuous short circuit operation at elevated ambient temperature can result in exceeding the

maximum allowed junction temperature of 150˚C.

Note 4: The maximum power dissipation is a function of T

, θ , and T . The maximum allowable power dissipation at any ambient temperature is

J(max) JA

− T )/θ . All numbers apply for packages soldered directly into a PC board.

J(max)

Note 5: Typical values represent the most likely parametric norm.

Note 6: All limits are guaranteed by testing or statistical analysis.

0.2V to 1.35V and 1.35V to 2.7V when V

Note 7: CMRR measured at V

0V to 2.5V and 2.5V to 5V when V

5V, V

2.7V. This eliminates units that

extremes and low or opposite V

have large V

at the V

at V

/2.

Note 8: All measurements made at 10 kHz. A 100 kΩ pull-up resistor was used when measuring the LMC7225. C

50 pF including the test jig and scope probe.

LOAD

The rise times of the LMC7225 are a function of the R-C time constant.

Note 9: Input step voltage for the propagation measurements is 100 mV.

Note 10: Do not short the output of the LMC7225 to voltages greater than 10V or damage may occur.

www.national.com

Typical Performance Characteristics T_A25˚C unless otherwise specified

Supply Current vs

Supply Voltage

Prop Delay vs V_Supply

Prop Delay vs Overdrive

DS012853-12

DS012853-13

DS012853-3

Short Circuit Current vs

V_Supply

Output Voltage vs Output

Current LMC7215

Output Voltage vs

Output Current

DS012853-14

DS012853-15

DS012853-16

Output Voltage vs

Output Current LMC7215

Output Voltage vs

Output Current

Output Leakage Current

vs Output Voltage

LMC7225

DS012853-17

DS012853-18

DS012853-19

www.national.com

Typical Performance Characteristics T_A25˚C unless otherwise specified (Continued)

Output Leakage Current

vs Output Voltage

LMC7225

DS012853-20

Application Information

RESPONSE TIME

If the input signal is noisy, the output cannot ignore the noise

unless some hysteresis is provided by positive feedback.

Depending upon the amount of overdrive, the delay will typi-

cally be between 10 µs to 200 µs. The curve showing delay

vs overdrive in the “Typical Characteristics” section shows

the delay time when the input is preset with 100 mV across

the inputs and then is driven the other way by 1 mV to 500

mV.

The transition from high to low or low to high is fast. Typically

1 µs rise and 400 ns fall.

With a small signal input, the comparators will provide a

square wave output from sine wave inputs at frequencies as

high as 25 kHz. Figure 1 shows a worst case example where

DS012853-5

FIGURE 2.

5 mV sine wave is applied to the input. Note that the out-

put is delayed by almost 180˚.

INPUT VOLTAGE RANGE

The LMC7215/25 have input voltage ranges that are larger

than the supply voltage guarantees that signals from other

parts of the system cannot overdrive the inputs. This allows

sensing supply current by connecting one input directly to

the V⁺line and the other to the other side of a current sense

resistor. The same is true if the sense resistor is in the

ground return line.

Sensing supply voltage is also easy by connecting one input

directly to the supply.

The inputs of these comparators are protected by diodes to

both supplies. This protects the inputs from both ESD as well

as signals that greatly exceed the supply voltages. As a re-

sult, current will flow through these forward biased diodes

whenever the input voltage is more than a few hundred mil-

livolts larger than the supplies. Until this occurs, there is es-

sentially no input current. As a result, placing a large resistor

in series with any input that may be exposed to large volt-

ages, will limit the input current but have no other noticeable

effect.

DS012853-4

FIGURE 1.

If the input current is limited to less than 5 mA by a series re-

sistor, (see Figure 2), a threshold or zero crossing detector,

that works with inputs from as low as a few millivolts to as

high as 5,000V, is made with only one resistor and the com-

parator.

NOISE

Most comparators have rather low gain. This allows the out-

put to spend time between high and low when the input sig-

nal changes slowly. The result is the output may oscillate be-

tween high and low when the differential input is near zero.

INPUTS

As mentioned above, these comparators have near zero in-

put current. This allows very high resistance circuits to be

used without any concern for matching input resistances.

The exceptionally high gain of these comparators, 10,000V/

mV, eliminates this problem. Less then 1 µV of change on

the input will drive the output from one rail to the other rail.

www.national.com

Application Information (Continued)

This also allows the use of very small capacitors in R-C type

timing circuits. This reduces the cost of the capacitors and

amount of board space used.

CAPACITIVE LOADS

The high output current drive allows large capacitive loads

with little effect. Capacitive loads as large as 10,000 pF have

no effect upon delay and only slow the transition by about 3

µs.

OUTPUT CURRENT

Even though these comparators use less than 1 µA supply

current, the outputs are able to drive very large currents.

The LMC7215 can source up to 50 mA when operated on a

5V supply. Both the LMC7215 and LMC7225 can sink over

20 mA. (See the graph of Max I_Ovs V_Supplyin the “Typical

Characteristics” section.)

DS012853-6

FIGURE 3.

This large current handling ability allows driving heavy loads

directly. LEDs, beepers and other loads can be driven easily.

The push-pull output stage of the LMC7215 is a very impor-

tant feature. This keeps the total system power consumption

to the absolute minimum. The only current consumed is the

less than 1 µA supply current and the current going directly

into the load. No power is wasted in a pull-up resistor when

the output is low. The LMC7225 is only recommended where

a level shifting function from one logic level to another is de-

sired, where the LMC7225 is being used as a drop-in lower

power replacement for an older comparator or in circuits

where more than one output will be paralleled.

POWER DISSIPATION

The large output current ability makes it possible to exceed

the maximum operating junction temperature of 85˚C and

possibly even the absolute maximum junction temperature of

150˚C.

The thermal resistance of the 8-pin surface mount package

is 165˚C/W. Shorting the output to ground with a 2.7V supply

will only result in about 5˚C rise above ambient.

DS012853-7

FIGURE 4. R_S100Ω

The thermal resistance of the much smaller SOT23-5 pack-

age is 325˚C/W. With a 2.7V supply, the raise is only 10.5˚C

but if the supply is 5V and the short circuit current is 50 mA,

this will cause a raise of 41˚C in the SO-8 and 81˚C in the

SOT23-5. This should be kept in mind if driving very low re-

sistance loads.

The LMC7215 produces a small current spike of 300 µA

peak for about 400 ns with 2.7V supply and 1.8 mA peak for

400 ns with a 5V supply. This spike only occurs when the

output is going from high to low. It does not occur when going

from low to high. Figure 4 and Figure 5 show what this cur-

rent pulse looks like on 2.7V and 5V supplies. The upper

trace is the output voltage and the lower trace is the supply

current as measured with the circuit in Figure 6 .

SHOOT-THROUGH

Shoot-through is a common occurrence on digital circuits

and comparators where there is a push-pull output stage.

This occurs when a signal is applied at the same time to both

the N-channel and P-channel output transistors to turn one

off and turn the other on. (See Figure 3.) If one of the output

devices responds slightly faster than the other, the fast one

can be turned on before the other has turned off. For a very

short time, this allows supply current to flow directly through

both output transistors. The result is a short spike of current

drawn from the supply.

If the power supply has a very high impedance, a bypass ca-

pacitor of 0.01 µF should be more than enough to minimize

the effects of this small current pulse.

www.national.com

Application Information (Continued)

DS012853-9

FIGURE 6.

LATCH-UP

In the past, most CMOS IC’s were susceptible to a damaging

phenomena known as latch-up. This occurred when an ESD

current spike or other large signal was applied to any of the

pins of an IC. The LMC7215 and LMC7225 both are de-

signed to make them highly resistant to this type of damage.

They have passed qualification tests with input currents on

any lead up to 300 mA at temperatures up to 125˚C.

DS012853-8

FIGURE 5. R_S10Ω

SPICE MODELS

For a SPICE model of the LMC7215, LMC7225 and many

other op-amps and comparators, contact the NSC Customer

Response Center at 800-272-9959 or on the World Wide

Web at http://www.national.com/models/index.html.

SOT-23-5 Tape and Reel Specification

REEL DIMENSIONS

DS012853-10

www.national.com

SOT-23-5 Tape and Reel Specification (Continued)

8 mm

7.00 0.059 0.512 0.795 2.165 0.331 + 0.059/−0.000 0.567

W1+ 0.078/−0.039

W1 + 2.00/−1.00

330.00 1.50 13.00 20.20 55.00

8.40 + 1.50/−0.00

14.40

Tape Size

TAPE FORMAT

Tape Section

Leader

# Cavities

0 (min)

75 (min)

3000

Cavity Status

Empty

Cover Tape Status

Sealed

(Start End)

Carrier

Empty

Filled

1000

Filled

Trailer

125 (min)

0 (min)

Empty

(Hub End)

Empty

TAPE DIMENSIONS

DS012853-11

0.315 0.012

8 mm

0.130 0.124 0.130 0.126

0.138 0.002

0.055 0.004

0.157

(3.3) (3.15) (3.3)

(3.2)

(3.5 0.05)

(1.4 0.11)

(4)

(8 0.3)

Tape Size

DIM

DIM F

DIM Ko

DIM

DIM W

www.national.com

Physical Dimensions inches (millimeters) unless otherwise noted

Suffix indicates number of units. See Ordering Information on first page.

5-Pin SOT Package

Order Number LMC7215IM5X, LMC7225IM5X, LMC7215IM5 or LMC7225IM5

NS Package Number MA05A

www.national.com

Physical Dimensions inches (millimeters) unless otherwise noted (Continued)

8-Pin Small Outline Package

Order Number LMC7215IM, LMC7225IM, LMC7215IMX or LMC7225IMX

NS Package Number M08A

LIFE SUPPORT POLICY

NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL

COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant

into the body, or (b) support or sustain life, and

whose failure to perform when properly used in

accordance with instructions for use provided in the

labeling, can be reasonably expected to result in a

significant injury to the user.

2. A critical component is any component of a life

support device or system whose failure to perform

can be reasonably expected to cause the failure of

the life support device or system, or to affect its

safety or effectiveness.

National Semiconductor

Corporation

Americas

Tel: 1-800-272-9959

Fax: 1-800-737-7018

Email: support@nsc.com

National Semiconductor

Europe

National Semiconductor

Asia Pacific Customer

Response Group

Tel: 65-2544466

Fax: 65-2504466

National Semiconductor

Japan Ltd.

Tel: 81-3-5639-7560

Fax: 81-3-5639-7507

Fax: +49 (0) 1 80-530 85 86

Email: europe.support@nsc.com

Deutsch Tel: +49 (0) 1 80-530 85 85

English Tel: +49 (0) 1 80-532 78 32

Français Tel: +49 (0) 1 80-532 93 58

Italiano Tel: +49 (0) 1 80-534 16 80

Email: sea.support@nsc.com

www.national.com

National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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LMC7215IM5X产品参数

型号:	LMC7215IM5X
是否Rohs认证：	不符合
生命周期：	Transferred
零件包装代码：	SOT-23
包装说明：	SOT-23, 5 PIN
针数：	5
Reach Compliance Code：	not_compliant
ECCN代码：	EAR99
HTS代码：	8542.33.00.01
风险等级：	5.18
放大器类型：	COMPARATOR
最大平均偏置电流 (IIB)：	0.001 µA
最大输入失调电压：	8000 µV
JESD-30 代码：	R-PDSO-G5
JESD-609代码：	e0
长度：	2.92 mm
湿度敏感等级：	1
负供电电压上限：
标称负供电电压 (Vsup)：
功能数量：	1
端子数量：	5
最高工作温度：	85 °C
最低工作温度：	-40 °C
输出类型：	PUSH-PULL
封装主体材料：	PLASTIC/EPOXY
封装代码：	LSSOP
封装等效代码：	TSOP5/6,.11,37
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, LOW PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260
电源：	2.7/5 V
认证状态：	Not Qualified
标称响应时间：	17000 ns
座面最大高度：	1.22 mm
子类别：	Comparator
最大压摆率：	0.001 mA
供电电压上限：	10 V
标称供电电压 (Vsup)：	2.7 V
表面贴装：	YES
技术：	CMOS
温度等级：	INDUSTRIAL
端子面层：	Tin/Lead (Sn/Pb)
端子形式：	GULL WING
端子节距：	0.953 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	40
宽度：	1.6 mm
Base Number Matches：	1

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产品型号LMC7215IM5X的概述

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