MAXIM MAX976, MAX978, MAX998 Technical data

________________General Description

The MAX976/MAX978/MAX998 dual/quad/single, high­speed, low-power comparators are optimized for
+3V/+5V single-supply applications. They achieve a
20ns propagation delay while consuming only 225µA
supply current per comparator. The MAX998 features a
low-power shutdown mode that places the output in a
high-impedance state and reduces supply current
to 1nA.

The MAX976/MAX978/MAX998 inputs have a common­mode voltage range that extends 200mV below ground.
Their outputs are capable of rail-to-rail operation with­out external pullup circuitry, making these devices ideal
for interface with CMOS/TTL logic. All inputs and out­puts can tolerate a continuous short-circuit fault condi­tion to either rail. The comparators’ internal hysteresis
ensures clean output switching, even with slow-moving
input signals.

For space-critical applications, the single MAX998 is
available in a 6-pin SOT23 package, the dual MAX976
is available in an 8-pin µMAX®package, and the quad
MAX978 is available in a 16-pin QSOP package.

________________________Applications

Battery-Powered Systems

Threshold Detectors/Discriminators

3V Systems

IR Receivers

Digital Line Receivers

____________________________Features

♦ Single-Supply Operation Down to 2.7V

♦ 20ns Propagation Delay

♦ 225µA Supply Current

♦ 1nA Shutdown Supply Current

♦ Rail-to-Rail Outputs

♦ Ground-Sensing Inputs

♦ Internal Hysteresis Ensures Clean Switching

♦ Available in Space-Saving Packages

SOT23 (MAX998)
µMAX (MAX976)
QSOP (MAX978)

MAX976/MAX978/MAX998

Single/Dual/Quad, SOT23, Single-Supply,

High-Speed, Low-Power Comparators

________________________________________________________________ Maxim Integrated Products 1

TOP VIEW

GND

IN-IN+

16V

CC

5 SHDN

OUT

MAX998

SOT23

2

34

+

-

__________________Pin Configurations

V

CC

V

CC

V

CC

V

CC

R

D

SHDN

R1 R2

IR RECEIVER

OUT

0.1μF

MAX998

V

CC

GND

___________Typical Operating Circuit

19-1299; Rev 3; 3/09

PART*

MAX976ESA

MAX976EUA

MAX978ESE

16 Narrow SO

8 µMAX

8 SO

PIN-PACKAGE

SOT

TOP MARK

—

—

—

_______________Ordering Information

Pin Configurations continued at end of data sheet

µMAX a registered trademark of Maxim Integrated Products, Inc.

MAX978EEE

MAX998ESA

MAX998EUT-T 6 SOT23

8 SO

16 QSOP —

—

AAAO

*All devices are specified over the -40°C to +85°C temper-

ature range.

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

mV

MAX976/MAX978/MAX998

Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.5V, VCM= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

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.

Supply Voltage (VCC).............................................................+6V

SHDN (MAX998) .........................................................-0.3V to 6V

All Other Pins..............................................-0.3V to (V

CC

+ 0.3V)

Current into Input Pins ......................................................±20mA

Duration of Output Short Circuit to GND or V

CC

........Continuous

Continuous Power Dissipation (T

A

= +70°C)

6-Pin SOT23-6 (derate 7.1mW/°C above +70°C) .........571mW

8-Pin µMAX (derate 4.10mW/°C above +70°C) ............330mW

8-Pin SO (derate 5.88mW/°C above +70°C).................471mW

16-Pin Narrow SO (derate 8.70mW/°C above +70°C) ..696mW

16-Pin QSOP (derate 8.33mW/°C above +70°C)..........667mW

Operating Temperature Range ..........................-40°C to +85°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300°C

VCC= 5.5V

MAX998 only, SHDN = GND

I

SINK

= 2mA

VCC= 5.5V

Inferred from PSRR test

VCC= 5V (Note 4)

2.7V < VCC< 5.5V

CONDITIONS

mA

90

OUT Short-Circuit Current

74

I

SH

V0.1 0.4V

OL

OUT Output-Voltage Low

nA±5 ±100I

OS

Input Offset Current

mVV

HYS

0.5 1.5 4.0

Input-Referred Hysteresis

nA1 500I

SD

Shutdown Supply Current

300 650

V2.7 5.5V

CC

Supply Voltage Range

dB63 100PSRRPower-Supply Rejection Ratio

UNITSMIN TYP MAXSYMBOLPARAMETER

C

LOAD

=10pF (Note 6) ns2t

SKEW

Propagation-Delay Skew

MAX976/MAX978 only ns1Δt

PD

Propagation-Delay Matching
Between Channels

Sinking

Sourcing

Overdrive = 50mV

ns

20 40

t

PD

Propagation Delay

I

SOURCE

= 2mA, VCC- V

OH

V0.1 0.4V

OH

OUT Output-Voltage High

(Note 2) V-0.2 VCC- 1.2V

CMR

Common-Mode Voltage Range

-0.2V ≤ VCM≤ (VCC- 1.2V) dB66 95CMRRCommon-Mode Rejection Ratio

VCC= 5V (Note 3) mV

0.2 ±2

V

OS

Input Offset Voltage

TA= +25°C

TA= T

MIN

to T

MAX

±3

pFInput Capacitance 3C

IN

28

C

LOAD

=10pF,

VCC= 5V (Note 5)

Overdrive = 5mV

MAX998 only V

SHDN Input-Voltage High

0.65 x V

CC

V

IH

MAX998 only V

SHDN Input-Voltage Low

0.2 x V

CC

V

IL

MAX998 only, SHDN = GND,
V

OUT

= 0V to V

CC

nAOUT Leakage Current 1 200I

OUT

MAX998 only nA

SHDN Input Current

1 200I

SHDN

C

LOAD

=10pF ns1.6tR/t

F

Output Rise/Fall Time

MAX998 only, VCC= 5V, ICC= 10% of typical µs5t

SD

Shutdown Delay Time

VCC= 2.7V

µA

225

I

CC

Supply Current per Comparator

0.3 1.5 5.0

nAI

B

75 300Input Bias Current

All others

MAX976EUA, MAX998EUT

MAX976/MAX978/MAX998

Single/Dual/Quad, SOT23, Single-Supply,

High-Speed, Low-Power Comparators

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +5.5V, VCM= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Note 1: The MAX998EUT specifications are 100% tested at T

A

= +25°C. Limits over the extended temperature range are guaran-

teed by design, not production tested.

Note 2: Inferred from CMRR test. Either input can be driven to the absolute maximum limit without false output inversion, as long as

the other input is within the common-mode voltage range.

Note 3: V

OS

is defined as the mean of trip points. The trip points are the extremities of the differential input voltage required to make

the comparator output change state (Figure 1).

Note 4: The difference between the upper and lower trip points is equal to the width of the input-referred hysteresis zone (Figure 1).
Note 5: Propagation Delay is guaranteed by design. For low overdrive conditions, V

TRIP

(Figure 1) is added to the overdrive.

Note 6: Propagation-Delay Skew is the difference between the positive-going and the negative-going propagation delay.
Note 7: For design purposes, the t

EN

can be as high as 60µs.

CONDITIONS

MAX998 only, VCC= 5V, ICC= 90% of typical
(Note 7)

µs15t

EN

Wake-Up from Shutdown

UNITSMIN TYP MAXSYMBOLPARAMETER

VCC= 0V to 5V step, output valid µs3t

PU

Power-Up Delay

__________________________________________Typical Operating Characteristics

(VCC= +5V, VCM= 0V, TA= +25°C, unless otherwise noted.)

125

175

275

225

325

375

-60 -20 0-40 20406080100

SUPPLY CURRENT PER COMPARATOR

vs. TEMPERATURE

MAX976 TOC01

TEMPERATURE (°C)

SUPPLY CURRENT PER COMPARATOR (μA)

VCC = 5.5V,
V

OUT

= LOW

VCC = 5.5V,
V

OUT

= HIGH

VCC = 2.7V,
V

OUT

= HIGH

VCC = 2.7V,
V

OUT

= LOW

10

30

20

50

40

70

60

80

100

90

110

-60 -20 0-40 20 40 60 80 100

SHORT-CIRCUIT OUTPUT CURRENT

vs. TEMPERATURE

MAZX976 TOC2

TEMPERATURE (°C)

OUTPUT CURRENT (mA)

VCC = 5.5V, SOURCING

VCC = 2.7V, SOURCING

VCC = 5.5V, SINKING

VCC = 2.7V, SINKING

1.6

0

0.1 1 10 100

OUTPUT LOW VOLTAGE

vs. OUTPUT SINK CURRENT

0.4

0.8

0.6

0.2

1.0

1.2

1.4

MAX976 TOC03

OUTPUT CURRENT (mA)

OUTPUT LOW VOLTAGE (V)

VCC = 5.5V

VCC = 2.7V

6

0

0.1 1 10 100

OUTPUT HIGH VOLTAGE

vs. OUTPUT SOURCE CURRENT

2

3

1

4

5

MAX976 TOC04

OUTPUT CURRENT (mA)

OUTPUT HIGH VOLTAGE (V)

VCC = 5.5V

VCC = 2.7V

17

19

18

21

20

22

24

23

25

26

27

-60 -20 0-40 20406080100

PROPAGATION DELAY

vs. TEMPERATURE

MAZX976 TOC5

TEMPERATURE (°C)

PROPAGATION DELAY (ns)

VCC = 5.5V

VCC = 2.7V

VOD = 50mV
C

LOAD

= 15pF

40

10

10 100 1000

PROPAGATION DELAY
vs. CAPACITIVE LOAD

MAX976 TOC06

CAPACITIVE LOAD (pF)

PROPAGATION DELAY (ns)

15

25

20

30

35

VOD = 50mV

V

IN+

50mV/div

10ns/div

PROPAGATION DELAY

(t

PD+, VCC

= 5V)

V

OUT

2V/div

MAX976 TOC13

VOD = 50mV
C

LOAD

= 15pF

10MHz RESPONSE

INPUT
50mV/div

20ns/div

OUTPUT
2V/div

V

OS

V

CC

GND

MAX976 TOC15

V

IN+

50mV/div

10ns/div

PROPAGATION DELAY

(t

PD-, VCC

= 5V)

V

OUT

2V/div

MAX976 TOC14

VOD = 50mV
C

LOAD

= 15pF

MAX976/MAX978/MAX998

Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators

4 _______________________________________________________________________________________

______________________________Typical Operating Characteristics (continued)

(VCC= +5V, VCM= 0V, TA= +25°C, unless otherwise noted.)

90

80

0

1 10 100

PROPAGATION DELAY

vs. INPUT OVERDRIVE

MAX976 TOC07

INPUT OVERDRIVE (mV)

PROPAGATION DELAY (ns)

10

30

20

50

40

70

60

C

LOAD

= 15pF

100

-1 234501 6

INPUT BIAS CURRENT

vs. INPUT COMMON-MODE VOLTAGE

0.01

MAX976 TOC10

INPUT COMMON-MODE VOLTAGE (V)

INPUT BIAS CURRENT (nA)

0.1

1

10

VCC = 2.7V VCC = 5.5V

-2.0

-1.0

-1.5

0

-0.5

0.5

1.0

1.5

2.0

-60 -20 0-40 20 40 60 80 100

TRIP POINTS AND OFFSET VOLTAGE

vs. TEMPERATURE

MAX976 TOC08

TEMPERATURE (°C)

TRIP POINTS/OFFSET VOLTAGE (mV)

V

TRIP+

V

TRIP-

V

OS

40

50

60

70

80

90

100

-60 -20-40 0 20 40 60 80 100

INPUT BIAS CURRENT

vs. TEMPERATURE

MAX976 TOC09

TEMPERATURE (°C)

INPUT BIAS CURRENT (nA)

VCC = 2.7V

VCC = 5.5V

V

IN+

50mV/div

10ns/div

PROPAGATION DELAY

(t

PD+, VCC

= 3V)

V

OUT

1V/div

MAX976 TOC11

VOD = 50mV
C

LOAD

= 15pF

V

IN+

50mV/div

10ns/div

PROPAGATION DELAY

(t

PD-, VCC

= 3V)

V

OUT

1V/div

MAX976 TOC12

C

LOAD

= 15pF

V

OD

= 50mV