MIC7221 [MICREL]

IttyBitty Rail-to-Rail Input Comparator;


型号：	MIC7221
厂家：	MICREL SEMICONDUCTOR
描述：	IttyBitty Rail-to-Rail Input Comparator
文件：	总7页 (文件大小：366K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

Micrel, Inc.

MIC7211/7221

IttyBitty Rail-to-Rail Input Comparator

General Description

Features

The MIC7211 and MIC7221 are micropower comparators

featuring rail-to-rail input performance in Micrel’s IttyBitty

SOT-23-5 package. The MIC7211/21 is ideal for systems

• Small footprint SOT-23-5 package

• Guaranteed performance at 2.2V, 2.7V, 5V, and 10V

• 7µA typical supply current at 5V

where small size is a critical consideration.

• <5µs response time at 5V

• Push-pull output (MIC7211)

• Open-drain output (MIC7221)

• Input voltage range may exceed supply voltage by 0.3V

• >100mA typical sink or source

TheMIC7211/21isoptimizedforsinglesupplyoperationfrom

2.2V to 10V power supplies.

The MIC7211 features a conventional push-pull output while

the MIC7221 has an open-drain output for mixed-voltage

applications with an external pull-up resistor.

Applications

The MIC7211/21 beneﬁts small battery-operated portable

electronic devices where small size and the ability to place

the comparator close to the signal source are primary design

concerns.

• Battery-powered products

• Notebook computers and PDAs

• PCMCIA cards

• Cellular and other wireless communication devices

• Alarm and security circuits

• Direct sensor interface

Ordering Information

Part Number

MIC7211BM5

MIC7221BM5

MIC7211YM5

MIC7221YM5

Marking

A14

Temp. Range

–40°C to +85°C

Package

SOT-23-5

Lead Finish

Standard

Pb-Free

A15

A14

A15

Pb-Free

Pin Conﬁguration

Functional Conﬁguration

IN+ V+ OUT

Part

Identification

Axx

IN–

V–

IN–

V–

SOT-23-5 (M5)

Pin Description

Pin Number

Pin Name

OUT

V+

Pin Function

Ampliﬁer Output

Positive Supply

Noninverting Input

Inverting Input

Negative Suppy

IN+

IN–

V–

Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

October 2009

M9999-100909

Micrel, Inc.

MIC7211/7221

Absolute Maximum Ratings (Note 1)

Operating Ratings (Note 2)

Supply Voltage (V – V ) ...........................................12V

Supply Voltage (V – V ) ...............................2.2V to 10V

V+

V–

V+ V–

Differential Input Voltage (V , V ) .............. ±(V – V

)

Junction Temperature (T ).......................... –40°C to +85°C

IN+

IN–

V+

V–

.............

I/O Pin Voltage (V , V

), Note 3 ..................................

Package Thermal Resistance (θ ) Note 5

235°C/W

IN+

OUT

..............................................V + 0.3V to V – 0.3V

Maximum Power Dissipation .................................... Note 4

V+

V–

Junction Temperature (T )....................................... +150°C

Storage Temperature (T ) ........................ –65°C to +150°C

ESD, Note 6

DC Electrical Characteristics (2.2V)

V_V+ = +2.2V, V_V–= 0V, V_CM= V_OUT= V_V+/2; T_J= 25°C, bold values indicate –40°C ≤ T_J≤ +85°C; Note 7; unless noted

Symbol

V_OS

Parameter

Condition

Min

Typ

Max

Units

Input Offset Voltage

TCV_OS

Input Offset Voltage

Temperature Drift

µV/°C

TCV_OS

Input Offset Voltage

Drift Over Time

3.3

^µV⁄month

I_B

Input Bias Current

0.5

0.25

I_OS

Input Offset Current

CMRR

PSRR

Common-Mode Rejection Ratio

0V ≤ V_CM≤ 2.2V

V_V+= 2.2V to 5V

Positive Power Supply

Rejection Ratio

A_VOL

V_OH

V_OL

I_S

Gain

125

2.18

0.02

Output Voltage (High)

Output Voltage (Low)

Supply Current

MIC7211, I_LOAD= 2.5mA

I_LOAD= 2.5mA

2.1

0.1

V_OUT= low

µA

DC Electrical Characteristics (2.7V)

V_V+ = +2.7V, V_V–= 0V, V_CM= V_OUT= V_V+/2; T_J= 25°C, bold values indicate –40°C ≤ T_J≤ +85°C; Note 7; unless noted

Symbol

V_OS

Parameter

Condition

Min

Typ

Max

Units

Input Offset Voltage

TCV_OS

Input Offset Voltage

Temperature Drift

µV/°C

TCV_OS

Input Offset Voltage

Drift Over Time

3.3

^µV⁄month

I_B

Input Bias Current

0.5

0.25

I_OS

Input Offset Current

CMRR

PSRR

Common-Mode Rejection Ratio

0V ≤ V_CM≤ 2.7V

V_V+= 2.7V to 5V

Positive Power Supply

Rejection Ratio

A_VOL

V_OH

V_OL

I_S

Gain

125

2.68

0.02

Output Voltage (High)

Output Voltage (Low)

Supply Current

MIC7211, I_LOAD= 2.5mA

I_LOAD= 2.5mA

2.6

0.1

V_OUT= low

µA

October 2009

M9999-100909

Micrel, Inc.

MIC7211/7221

DC Electrical Characteristics (5V)

V_V+ = +5.0V, V_V–= 0V, V_CM= V_OUT= V_V+/2; T_J= 25°C, bold values indicate –40°C ≤ T_J≤ +85°C; Note 7; unless noted

Symbol

V_OS

Parameter

Condition

Min

Typ

Max

Units

Input Offset Voltage

TCV_OS

Input Offset Voltage

Temperature Drift

µV/°C

TCV_OS

Input Offset Voltage

Drift Over Time

3.3

^µV⁄month

I_B

Input Bias Current

0.5

0.25

I_OS

Input Offset Current

CMRR

PSRR

Common-Mode Rejection Ratio

0V ≤ V_CM≤ 5.0V

V_V+= 5.0V to 10V

Positive Power Supply

Rejection Ratio

A_VOL

V_OH

V_OL

I_S

Gain

125

4.95

0.05

Output Voltage (High)

Output Voltage (Low)

Supply Current

MIC7211, I_LOAD= 5mA

I_LOAD= 5mA

4.9

0.1

V_OUT= low

µA

I_SC

Short Circuit Current

MIC7211, sourcing

sinking

150

110

DC Electrical Characteristics (10V)

V_V+ = +10V, V_V–= 0V, V_CM= V_OUT= V_V+/2; T_J= 25°C, bold values indicate –40°C ≤ T_J≤ +85°C; Note 7; unless noted

Symbol

V_OS

Parameter

Condition

Min

Typ

Max

Units

Input Offset Voltage

TCV_OS

Input Offset Voltage

Temperature Drift

µV/°C

TCV_OS

Input Offset Voltage

Drift Over Time

3.3

^µV⁄month

I_B

Input Bias Current

0.5

0.25

I_OS

Input Offset Current

CMRR

PSRR

Common-Mode Rejection Ratio

0V ≤ V_CM≤ 10V

Positive Power Supply

V_V+= 5.0V to 10V

Rejection Ratio

A_VOL

V_OH

V_OL

I_S

Gain

125

9.95

0.05

Output Voltage (High)

Output Voltage (Low)

Supply Current

MIC7211, I_LOAD= 5mA

I_LOAD= 5mA

9.9

0.1

V_OUT= low

µA

I_SC

Short Circuit Current

MIC7211, sourcing

sinking

165

125

October 2009

M9999-100909

Micrel, Inc.

MIC7211/7221

AC Electrical Characteristics

V_V–= 0V, V_CM= V_OUT= V_V+/2; T_J= 25°C, bold values indicate –40°C ≤ T_J≤ +85°C; Note 7; unless noted

Symbol

Parameter

Condition

Min

Typ

Max

Units

t_RISE

Rise Time

V_V+= 5.0V, f = 10kHz, C_LOAD= 50pF

overdrive = 10mV, Note 9

t_FALL

t_PHL

Fall Time

V_V+= 5.0V, f = 10kHz, C_LOAD= 50pF

overdrive = 10mV, Note 9

µs

Propagation Delay-High to Low

V_V+= 2.2V, f = 10kHz, C_LOAD= 50pF

overdrive = 10mV, Note 9

V_V+= 2.2V, f = 10kHz, C_LOAD= 50pF

overdrive = 100mV, Note 9

6.0

V_V+= 5.0V, f = 10kHz, C_LOAD= 50pF

overdrive = 10mV, Note 9

V_V+= 5.0V, f = 10kHz, C_LOAD= 50pF

overdrive = 100mV, Note 9

t_PLH

Propagation Delay-Low to High

V_V+= 2.2V, f = 10kHz, C_LOAD= 50pF

overdrive = 10mV, Note 9

13.5

4.0

11.5

3.0

V_V+= 2.2V, f = 10kHz, C_LOAD= 50pF

overdrive = 100mV, Note 9

V_V+= 5.0V, f = 10kHz, C_LOAD= 50pF

overdrive = 10mV, Note 9

V_V+= 5.0V, f = 10kHz, C_LOAD= 50pF

overdrive = 100mV, Note 9

Note 1. Exceeding the absolute maximum rating may damage the device.

Note 2. The device is not guaranteed to function outside its operating rating.

Note 3. I/O pin voltage is any external voltage to which an input or output is referenced.

Note 4. The maximum allowable power dissipation is a function of the maximum junction temperature, T

; the junction-to-ambient thermal

J(max)

resistance, θ ; and the ambient temperature, T . The maximum allowable power dissipation at any ambient temperature is calculated using

= (T

– T ) ÷ θ . Exceeding the maximum allowable power dissipation will result in excessive die temperature.

D(max)

J(max)

Note 5. Thermal resistance, θ , applies to a part soldered on a printed circuit board.

Note 6. Devices are ESD sensitive. Handling precautions recommended.

Note 7. All limits guaranteed by testing on statistical analysis.

Note 8. Continuous short circuit may exceed absolute maximum T under some conditions.

Note 9. The MIC7221 requires 5kΩ pull-up resistor.

Partial Functional Diagrams

V+

OUT

V–

MIC7211 Push-Pull Output

MIC7221 Open-Drain Output

October 2009

M9999-100909

Micrel, Inc.

MIC7211/7221

circuits, such as a single-supply zero-crossing detector or a

circuit that senses its own supply voltage.

Application Information

The small outline and low supply current (typically 7µA at

5V) of the MIC7211/21 are the primary advantages of these

comparators. They have been characterized for 2.2V, 2.7V,

5V, and 10V operation.

The comparator must be powered if an input is pulled above

the rail, even with current limiting in effect. Figure 2 shows

a hypothetical situation where an input is pulled higher than

the rail when the power supply is off or not present. Figure 2

also shows external clamp diodes for additional input circuit

protection. Discrete clamp diodes can be arbitrarily more

robust than the internal clamp diodes.

Their2.2Vcapabilityisespeciallyusefulinlow-batteryvoltage

situations. Low-voltage operation allows longer battery life

or deeper discharge capability. Even at 2.2V, the output can

drive several logic-gate inputs. At 2.5mA, the output stage

voltage drop is guaranteed to not exceed 0.1V.

The power supply has been simpliﬁed (real power supplies

do not have a series output diode); however, this illustrates

a common characteristic of most positive-voltage power sup-

plies: they are designed to source, but not sink, current. If the

supply is off, or disconnected, there is no limiting voltage for

the clamp diode to reference. The input signal can charge

the the bypass capacitor, and possibly the ﬁlter capacitor, up

Outputs

The MIC7211 has a push-pull output while the MIC7221 has

an open-drain output, otherwise both comparators share a

common design.

Theopen-drainMIC7221outputcanbepulledupto10V,even

when the supply voltage is as low as 2.2V. Conversely, the

output also can be pulled up to voltages that are lower than

thepositivesupply.Logic-leveltranslationisreadilyfacilitated

by the ability to pull the open-drain output to voltages above

or below the power supply.

to the applied input (V ). This may be high enough to cause

a thin-oxide rupture in a CMOS integrated circuit.

POSSIBLE

0V WHEN

V⁺⁺

DISCONNECT

SUPPLY

IS OFF

V⁺

0.1µF

Power

R_IN

Supply

Output

Although speciﬁed short-circuit output current speciﬁed

for these parts typically exceeds 100mA, their output is

not intended to sink or source anywhere near 100mA. The

short-circuitratingisonlypresentedasadditionalinformation

regarding output impedance and may be useful for deter-

mining the voltage drop one may experience when driving

a given load.

V_IN

(>>V+)

V_OUT

V_REF

R_F

Note: 1V ≤ V⁺⁺≤ 10V

Figure 2. Avoid This Condition

Input Bias Current

The low input-bias current (typically 0.5pA) requirement of

the MIC7211/21 provides ﬂexibility in the kinds of circuitry

and devices that can be directly interfaced.

Ideally,thesupplyforthecomparatorandtheinput-producing

circuitry should the same or be switched simultaneously.

Bypass Capacitors

Designs using an ampliﬁer for transducer-to-comparator

impedance transformation may be simpliﬁed by using the

MIC7211/21’s low-input-current requirement to eliminate

the ampliﬁer.

CMOS circuits, especially logic gates with their totem-pole

(push-pull) output stages, generate power supply current

spikes(noise)onthesupplyand/orgroundlines.Thesespikes

occur because, for a ﬁnite time during switching, both output

transistors are partially on allowing “shoot-through current.”

Bypass capacitors reduce this noise.

Input Signal Levels

Input signals may exceed either supply rail by up to 0.2V

without phase inversion or other adverse effects. The inputs

Adequate bypassing for the MIC7211 comparator is 0.01µF;

in low-noise systems, where this noise may interfere with the

functioning or accuracy of nearby circuitry, 0.1µF is recom-

mended. Because the MIC7221 does not have a totem-pole

output stage, this spiking is not evident; however, switching

a capacitive load can present a similar situation.

have internal clamp diodes to the supply pins.

V⁺

0.1µF

R_IN

V_IN

(±100V) ≥100k

Thermal Behavior

The thermal impedance of a SOT-23-5 package is 325˚C/W.

The 5V Electrical Characteristics table shows a maximum

voltage drop of 0.1V for a 5mA output current, making the

output resistance about 20Ω (R = 0.1/0.005 = 20Ω). At-

tempting to draw the typical speciﬁed output short-circuit

current of 150mA (sourcing) can be expected to cause a

die temperature rise of 146˚C. (Operating die temperature

for ICs should generally not exceed 125˚C.) Using a series

resistance is the simplest form of protecting against damage

by excessive output current.

V_REF

V_OUT

R_F

Note: R_Fand R1 control hysteresis (typically, R_F>> R1).

Figure 1. Driving the Input Beyond the Supply Rails

Larger input swings can be accommodated if the input cur-

rent is limited to 1mA or less. Using a 100k input resistor will

allow an input to swing up to 100V beyond either supply rail.

Becauseofthelowinputbiascurrentofthedevice,evenlarger

inputresistorsarepractical. SeeFigure1.Theabilitytoswing

the input beyond either rail facilitates some otherwise difﬁcult

October 2009

M9999-100909

Micrel, Inc.

MIC7211/7221

Package Information

SOT-23-5 (M5)

October 2009

M9999-100909

Micrel, Inc.

MIC7211/7221

MICREL INC. 2180 FORTUNE DRIVE SAN JOSE, CA 95131 USA

t e l + 1 (408) 944-0800 f a x + 1 (408) 474-1000 w e b http://www.micrel.com

The information furnished by Micrel in this data sheet is believed to be accurate and reliable. However, no responsibility is assumed by Micrel for its use.

Micrel reserves the right to change circuitry and speciﬁcations at any time without notiﬁcation to the customer.

Micrel Products are not designed or authorized for use as components in life support appliances, devices or systems where malfunction of a product can

reasonably be expected to result in personal injury. Life support devices or systems are devices or systems that (a) are intended for surgical implant into

the body or (b) support or sustain life, and whose failure to perform can be reasonably expected to result in a signiﬁcant injury to the user. A Purchaser’s

use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully indemnify

Micrel for any damages resulting from such use or sale.

October 2009

M9999-100909

MIC7221 [MICREL]

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