MAX9646EBS+TG45 - Maxim Integrated

19-5803; Rev 2; 3/17

UCSP is a trademark of Maxim Integrated Products, Inc.

General Description

The MAX9644/MAX9645/MAX9646 are small, single

comparators, ideal for a wide variety of portable electronics

applications such as cell phones, media players, and

notebooks that have extremely tight board space and

power constraints. These comparators are offered in

both a miniature 4-bump UCSP™ package with a 1mm

x 1mm footprint (as small as two 0402 resistors) and a

5-pin SOT23 package.

The ICs feature an input voltage range of -0.3V to +5.5V,

independent of supply voltage. These devices maintain

high impedance at the inputs even when powered down

(VCC or VREF = 0V). They also feature internal filtering to

provide high RF immunity.

The ICs have an internal 0.2V reference. These devices

feature either a push-pull or an open-drain output. They

consume only 700nA (max) supply current and operate

down to VCC = 1V over the extended -40ºC to +85ºC

temperature range.

Applications

●Cell Phones

●Portable Media Players

●Electronic Toys

●Notebook Computers

●Portable Medical Devices

Benets and Features

●Tiny, 1mm x 1mm x 0.6mm 4-Bump UCSP

• Footprint = Two 0402 Resistors

• Also Available in a 5-Pin SOT23 Package

●Ultra-Low Operating Current (700nA max)

●-0.3V to +5.5V Input Voltage Range

●Internal 0.2V Reference Trimmed to 1% Accuracy

● 15μs Propagation Delay

●-40ºC to +85ºC Extended Temperature Range

Note: All devices are specified over the extended -40°C to

+85°C operating temperature range.

+Denotes a lead(Pb)-free/RoHS-compliant package.

G45 = Protective die coating.

PART PIN-PACKAGE TOP MARK

MAX9644EBS+G45 4 UCSP +AGL

MAX9644EUK+ 5 SOT23 +AFJN

MAX9645EBS+G45 4 UCSP +AGM

MAX9645EUK+ 5 SOT23 +AFJO

MAX9646EBS+G45 4 UCSP +AGN

MAX9646EUK+ 5 SOT23 +AFJP

PART REFERENCE VOLTAGE (V) INPUT OUTPUT

MAX9644 0.2 Noninverting Open-Drain

MAX9645 0.2 Inverting Open-Drain

MAX9646 0.2 Noninverting Push-Pull

Ordering Information

Selector Guide

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

VCC, REF, IN to GND .............................................. -0.3V to +6V

OUT to GND (MAX9644/MAX9645) ........................ -0.3V to +6V

OUT to GND (MAX9646 only) ............... -0.3V to + (VCC + 0.3V)

Output Short-Circuit Current Duration ................................... 10s

Input Current into Any Terminal ........................................ ±20mA

Continuous Power Dissipation

4-Bump UCSP (derate 3.0mW/ºC above +70ºC) ........238mW

5-Pin SOT23 (derate 3.9mW/ºC above +70ºC) ........... 312mW

Operating Temperature Range ............................ -40ºC to +85ºC

Junction Temperature ...................................................... +150ºC

Storage Temperature Range ............................ -65?C to +150ºC

Bump Temperature (soldering) Reflow ............................ +235ºC

Lead Temperature (soldering, 10s) ................................. +300ºC

Soldering Temperature (reflow) ....................................... +260ºC

(VCC = 3.3V, RPULLUP = 10kΩ to VPULLUP = 3.3V for MAX9644/MAX9645, TA = -40°C to +85°C. Typical values at TA = +25°C, unless

otherwise noted.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DC CHARACTERISTICS

Input Voltage Range VIN Guaranteed by IIN test -0.3 +5.5 V

Input Bias Current IIN VIN = 0.2V to 5.5V (Note 2) 0.06 15 nA

Input Leakage Current IIN_SHDN VCC = 0V, VIN = 5.5V (Note 2) < 0.1 15 nA

Output Voltage Low VOL

ISINK = 50µA, VCC = 1.0V 0.03 0.2

ISINK = 200µA, VCC = 1.2V 0.08 0.20

ISINK = 500µA, VCC = 1.8V 0.13 0.23

ISINK = 0.75mA, VCC = 3.3V 0.14 0.3

ISINK = 1.2mA, VCC = 5.5V 0.19 0.5

Output Voltage High

(MAX9464 Only) VOH

ISOURCE = 15µA, VCC = 1.0V VCC -

0.08V VCC - 0.2V

ISOURCE = 40µA, VCC = 1.2V VCC -

0.08V

VCC -

0.20V

ISOURCE = 180µA, VCC = 1.8V VCC -

0.15V

VCC -

0.23V

ISOURCE = 0.3mA, VCC = 3.3V VCC -

0.13V VCC - 0.3V

ISOURCE = 0.75mA, VCC = 5.5V VCC -

0.24V VCC - 0.5V

Output Leakage Current

(MAX9644/MAX9645 Only) IOUT_LEAKAGE OUT = high, VPULLUP = 5.5V

(Note 2) < 0.1 15 nA

AC CHARACTERISTICS

Propagation Delay tPD VOVERDRIVE = ±100mV (Note 3) 15 µs

Fall Time tFCL = 10pF 14 ns

Rise Time tRCL = 10pF, MAX9646 only 30 ns

REFERENCE VOLTAGE

Input Threshold (Note 4) VREF

MAX964_EBS+ 200 mV

MAX964_EUK+ 199

Absolute Maximum Ratings

Stresses beyond those listed under ?Absolute Maximum Ratings? may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these

or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

Electrical Characteristics

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

www.maximintegrated.com Maxim Integrated

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(VCC = 3.3V, RPULLUP = 10kΩ to VPULLUP = 3.3V for MAX9644/MAX9645, TA = -40°C to +85°C. Typical values at TA = +25°C, unless

otherwise noted.) (Note 1)

Note 1: All devices are 100% production tested at TA = +25°C. Temperature limits are guaranteed by design.

Note 2: Too small to be measured in an ATE test environment. Only gross test to catch failures is implemented.

Note 3: Overdrive is defined as the voltage above or below the switching points.

Note 4: Guaranteed by ATE and/or bench characterization over temperature. VREF is the average of the trip points.

Note 5: Hysteresis is half the input voltage difference between the two switching points.

Note 6: Includes reference error along with comparator offset voltage error.

(VCC = 3.3V, VREF = 1.8V, RPULLUP = 10kΩ to VPULLUP = 3.3V for MAX9644/MAX9645, VGND = 0V, TA = +25°C, unless otherwise

noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Input Threshold Error

(Note 4) Delta-VREF

TA = +25°C -1 +1 %

TA = -40°C to +85°C -3.5 +3.5

Input Threshold Hysteresis VHYS TA = -40°C to +85°C (Note 5) ±0.9 mV

REF Tempco VREF_TEMPCO (Note 6) 6 µV/°C

Power-Supply Rejection

Ratio PSRR VCC = 1.0V to 5.5V 40 53 dB

POWER SUPPLY

Supply Voltage VCC Guaranteed by VOL/VOH tests 1.0 5.5 V

Supply Current ICC

VCC = 1.0V 0.4 0.7 µA

VCC = 5.5V 0.6 1.1

Power-Up Time tON 3 ms

OUTPUT VOLTAGE LOW

vs. SINK CURRENT

MAX9644 toc03

SINK CURRENT (mA)

OUTPUT VOLTAGE LOW (V)

0.5

1.0

0.1

0.6

0.4

0.9

0.3

0.8

0.2

0.7

0 4 8

VREF = 3.3V

VREF = 1.8V

VREF = 5V

SUPPLY CURRENT

vs. OUTPUT TRANSITION FREQUENCY

MAX9644 toc02

OUTPUT TRANSITION FREQUENCY (kHz)

SUPPLY CURRENT (A)

1 10

100

0.1 100

VCC = 5V

VCC = 3.3V

VCC = 1.8V

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX9644 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (nA)

54321

200

400

600

800

1000

0 6

+85C

-40C

+25C

Electrical Characteristics (continued)

Typical Operating Characteristics

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

www.maximintegrated.com Maxim Integrated

│

(VCC = 3.3V, VREF = 1.8V, RPULLUP = 10kΩ to VPULLUP = 3.3V for MAX9644/MAX9645, VGND = 0V, TA = +25°C, unless otherwise

noted.)

OUTPUT VOLTAGE HIGH

vs. SOURCE CURRENT (MAX9646)

MAX9644 toc04

SOURCE CURRENT (mA)

OIUTPUT VOLTAGE HIGH (VCC - VOH, V)

0.5

1.0

0.1

0.6

0.4

0.9

0.3

0.8

0.2

0.7

0 1.51.0 2.5 3.00.5 2.0

VCC = 3.3V

VCC = 1.8V

VCC = 5V

INPUT BIAS CURRENT

vs. INPUT BIAS VOLTAGE

MAX9644 toc05

INPUT BIAS VOLTAGE (V)

INPUT BIAS CURRENT (nA)

-5

-10

-15

-20

0 0.20 0.25 0.300.05 0.10 0.15

VCC = 3.3V

REFERENCE VOLTAGE

vs. TEMPERATURE

MAX9644 toc06

TEMPERATURE (C)

REFERENCE VOLTAGE (mV)

201.6

202.0

201.8

201.4

201.2

201.0

201.7

201.9

201.5

201.3

201.1

-40 8510 60-15 35

VCC = 3.3V

REFERENCE VOLTAGE

vs. SUPPLY VOLTAGE

MAX9644 toc07

SUPPLY VOLTAGE (V)

REFERENCE VOLTAGE (mV)

200.2

201.0

200.6

199.8

199.4

199.0

200.4

200.8

200.0

199.6

199.2

1.0 5.02.5 3.0 4.54.01.5 2.0 3.5

PROPAGATION DELAY

vs. TEMPERATURE

MAX9644 toc08

TEMPERATURE (C)

PROPAGATION DELAY (s)

-40 -15 60 853510

VCC = 3.3V

VCC = 1.8V

VCC = 5V

VOD = 100mV

PROPAGATION DELAY

vs. INPUT OVERDRIVE

MAX9644 toc09

INPUT OVERDRIVE (mV)

PROPAGATION DELAY (s)

0 100 150 25020050

VCC = 3.3V

VCC = 1.8V

VCC = 5V

Typical Operating Characteristics (continued)

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

Maxim Integrated

│

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(VCC = 3.3V, VREF = 1.8V, RPULLUP = 10kΩ to VPULLUP = 3.3V for MAX9644/MAX9645, VGND = 0V, TA = +25°C, unless otherwise

noted.)

PROPAGATION DELAY AT VCC = 3.3V

MAX9644 toc10

100s/div

0.1V

0.3V

IN+

100mV/div

OUT

2V/div

POWER-UP/POWER-DOWN RESPONSE

MAX9644 toc12

1ms/div

VCC

2V/div

OUT

2V/div

VIN = 0.3V

VCC = 3.3V

POWER-SUPPLY REJECTION

FOR NO FALSE TRIGGERING

MAX9644 toc14

FREQUENCY (Hz)

TRIP POINT (mV)

100k100

200

206

194

202

196

204

198

10 10k1k 1M

VCC = 3.3V + 100mVP-P

UPPER TRIP POINT

LOWER TRIP POINT

REFERENCE VOLTAGE

vs. TEMPERATURE

MAX9644 toc11

TEMPERATURE (C)

REFERENCE VOLTAGE (mV)

201.6

202.0

201.8

201.4

201.2

201.0

201.7

201.9

201.5

201.3

201.1

-40 8510 60-15 35

VCC = 3.3V

OUTPUT RESPONSE TO

SUPPLY VOLTAGE TRANSIENT

MAX9644 toc13

1ms/div

3.2V VCC

200mV/div

OUT

2V/div

OUT

2V/div

OUT

2V/div

VIN = VTH + 20mV

VIN = VTH + 10mV

VIN = VTH + 1mV

Typical Operating Characteristics (continued)

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

Maxim Integrated

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PIN NAME FUNCTION

UCSP SOT23

A1 5 OUT Comparator Output. The MAX9644/MAX9645 have open-drain outputs. The MAX9646 has a

push-pull output.

A2 4 IN Comparator Input. The MAX9644/MAX9646 have noninverting inputs. The MAX9645 has

inverting inputs.

B1 1 VCC Power-Supply Voltage. Bypass to ground with a 0.1µF bypass capacitor.

B2 2, 3 GND Ground

MAX9644

MAX9645

MAX9646

MAX9644

MAX9645

MAX9646

UCSP SOT23

TOP VIEW (BUMPS ON BOTTOM)

B1 B2

GND

OUT

VCC

GND

OUT

GND

Pin Conguration

Pin Description

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

www.maximintegrated.com Maxim Integrated

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Detailed Description

The MAX9644/MAX9645/MAX9646 are extremely small

comparators ideal for compact, low-current, and low-

voltage applications.

The ICs consume only 400nA (typ). The low-voltage

operating capability of the operating current makes these

devices extremely attractive to long-life battery-operated

devices—these applications can now use a single digital

power-supply rail to power the new generation of micro-

controllers (which can be down to 0.9V). All parts are

available in a tiny 4-bump UCSP, which is only 0.6mm tall

and occupies a 1mm x 1mm footprint and a 5-pin SOT23.

Input Stage Circuitry

Noninverting inputs are available on the MAX9644/

MAX9646 and inverting inputs are available on the

MAX9645.

The MAX9644/MAX9645/MAX9646 incorporate an inno-

vative input stage architecture that allows their input

voltage to exceed VCC by several volts (limited only by

the Absolute Maximum Ratings). This is unlike traditional

comparators that have an input ESD diode clamp between

the input and VCC, limiting this maximum overvoltage to

about 0.3V. The ICs architecture maintains a high input

impedance to input signals even when the device power-

supply voltage is completely turned off (VCC or REF

taken to 0V). This greatly benefits flexible power-saving

schemes to be easily implemented in advanced battery-

operated devices. On-chip filtering provides immunity

from any RF noise being picked up by input traces. These

devices feature an internal temperature-compensated,

low-power 0.2V reference voltage

Output Stage Structure

The MAX9644/MAX9645 have open-drain outputs that

allow them to interface to logic circuitry running from sup-

ply voltages other than the one supplied to the part. These

devices require an external pullup resistor or current

source for proper operation. Many microcontroller digital

inputs ports can be readily programmed to include these.

The MAX9646 has a push-pull output stage that can

both sink and source current, eliminating the need for an

external pullup resistor. In this case, the MAX9646 uses

the microcontroller's power supply as VCC

Applications Information

Bypassing REF/VCC

Place a 0.1μF capacitor between REF or VCC and GND

as close as possible to the device. During a switching

event, all comparators draw a current spike from their

power-supply rails. This current spike is minimized by the

use of an internal break-before-make design.

Hysteresis Operation

The ICs feature internal hysteresis for noise immunity and

glitch-free operation. If additional hysteresis is needed, an

external positive feedback network can be easily imple-

mented on the MAX9644 and MAX9646 noninverting input

devices. Additional external hysteresis is not possible on

the MAX9645 because the noninverting input of the com-

parator is not externally accessible.

Table 1. How Devices Behave Under Various Input Voltage Conditions

PART INPUT VOLTAGE CONDITIONS ACTION AT OUTPUT

MAX9644 VIN > 0.2V External pullup resistor pulls output high.

VIN < 0.2V Output asserts low.

MAX9645 VIN > 0.2V Output asserts low.

VIN < 0.2V External pullup resistor pulls output high.

MAX9646 VIN > 0.2V Output asserts high.

VIN < 0.2V Output asserts low.

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

www.maximintegrated.com Maxim Integrated

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MAX9644

IN MICROCONTROLLER

INTERNAL

PULLUP

VDD

VCC = 1.0V TO 5.5V

I/OOUT

0.2V REF

MAX9646

IN MICROCONTROLLER

VDD

VCC = 1.0V TO 5.5V

I/OOUT

0.2V REF

MAX9645

IN MICROCONTROLLER

INTERNAL

PULLUP

VDD

VCC = 1.0V TO 5.5V

I/OOUT

0.2V REF

Typical Operating Circuits

Chip Information

PROCESS: BiCMOS

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

www.maximintegrated.com Maxim Integrated

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PACKAGE TYPE PACKAGE CODE DOCUMENT NO. LAND PATTERN NO.

4 UCSP B4+1 21-0117 Refer to Application Note 1891

5 SOT23 U5+2 21-0057 90-0174

Package Information

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,

“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing

pertains to the package regardless of RoHS status.

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

www.maximintegrated.com Maxim Integrated

│

Package Information (continued)

For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,

“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing

pertains to the package regardless of RoHS status.

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

www.maximintegrated.com Maxim Integrated

│

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 3/14 Initial release —

1 10/11 Updated Features section 1

2 3/17 Updated title to include “nanoPower” 1–11

Revision History

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)

shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.

MAX9644/MAX9645/

MAX9646

nanoPower Comparators with

Precision Reference in 4-Bump UCSP

│

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

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