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19-1299; Rev 1; 1/98
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
________________General Description
The MAX976/MAX978/MAX998 dual/quad/single, high-
speed, 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 common-
mode voltage range that extends 200mV below ground.
Their outputs are capable of Rail-to-Rail
®
operation
without external pull-up circuitry, making these devices
ideal for interface with CMOS/TTL logic. All inputs and
outputs can tolerate a continuous short-circuit fault con-
dition 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.
____________________________Features
o
Single-Supply Operation Down to 2.7V
o
20ns Propagation Delay
o
225µA Supply Current
o
1nA Shutdown Supply Current
o
Rail-to-Rail Outputs
o
Ground-Sensing Inputs
o
Internal Hysteresis Ensures Clean Switching
o
Available in Space-Saving Packages:
SOT23-6 (MAX998)
µMAX (MAX976)
QSOP-16 (MAX978)
MAX976/MAX978/MAX998
_______________Ordering Information
PART
MAX976ESA
MAX976EUA
MAX978ESE
MAX978EEE
MAX998ESA
MAX998EUT-T
TEMP. RANGE PIN-PACKAGE
-40°C to +85°C 8 SO
-40°C to +85°C 8 µMAX
-40°C to +85°C 16 Narrow SO
-40°C to +85°C 16 QSOP
-40°C to +85°C 8 SO
-40°C to +85°C 6 SOT23-6
SOT
TOP MARK
—
—
—
—
—
AAAO
________________________Applications
Battery-Powered Systems
Threshold Detectors/Discriminators
3V Systems
IR Receivers
Digital Line Receivers
___________Typical Operating Circuit
V
CC
V
CC
0.1µF
V
CC
R
D
GND
SHDN
V
CC
R1
V
CC
R2
OUT
__________________Pin Configurations
TOP VIEW
OUT
1
MAX998
6
V
CC
GND
2
5
SHDN
+ -
MAX998
IN+
3
4
IN-
SOT23-6
IR RECEIVER
Pin Configurations continued at end of data sheet
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
MAX976/MAX978/MAX998
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V
CC
).............................................................+6V
SHDN
(MAX998) .........................................................-0.3V to 6V
All Other Pins..............................................-0.3V to (V
CC
+ 0.3V)
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, 10sec) .............................+300°C
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
(V
CC
= +2.7V to +5.5V, V
CM
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current per Comparator
Shutdown Supply Current
Power-Supply Rejection Ratio
Common-Mode Voltage Range
Common-Mode Rejection Ratio
Input Offset Voltage
Input-Referred Hysteresis
Input Bias Current
Input Offset Current
OUT Output Voltage High
OUT Output Voltage Low
OUT Short-Circuit Current
Input Capacitance
SHDN
Input Voltage High
SHDN
Input Voltage Low
OUT Leakage Current
SHDN
Input Current
Propagation Delay
Propagation-Delay Skew
Propagation-Delay Matching
Between Channels
Output Rise/Fall Time
Shutdown Delay Time
SYMBOL
V
CC
I
CC
I
SD
PSRR
V
CMR
CMRR
V
OS
V
HYS
I
B
I
OS
V
OH
V
OL
I
SH
C
IN
V
IH
V
IL
I
OUT
I
SHDN
t
PD
t
SKEW
∆t
PD
t
R
/t
F
t
SD
MAX998 only
MAX998 only
MAX998 only,
SHDN
= GND,
V
OUT
= 0V to V
CC
MAX998 only
C
LOAD
=10pF,
V
CC
= 5V (Note 5)
Overdrive = 5mV
Overdrive = 50mV
1
1
28
20
2
1
1.6
5
40
0.65 x V
CC
0.2 x V
CC
200
200
I
SOURCE
= 2mA,
V
CC
- V
OH
I
SINK
= 2mA
V
CC
= 5.5V
Sinking
Sourcing
V
CC
= 5.5V
V
CC
= 2.7V
MAX998 only,
SHDN
= GND
2.7V < V
CC
< 5.5V
(Note 2)
-0.2V
≤
V
CM
≤
(V
CC
- 1.2V)
V
CC
= 5V (Note 3)
V
CC
= 5V (Note 4)
T
A
= +25°C
T
A
= T
MIN
to T
MAX
MAX976EUA, MAX998EUT
All others
0.3
0.5
1.5
1.5
75
±5
0.1
0.1
74
90
3
63
-0.2
66
95
0.2
±2
±3
5
4
300
±100
0.4
0.4
CONDITIONS
Inferred from PSRR test
MIN
2.7
300
225
1
100
V
CC
- 1.2
500
TYP
MAX
5.5
650
UNITS
V
µA
nA
dB
V
dB
mV
mV
mV
nA
nA
V
V
mA
pF
V
V
nA
nA
ns
ns
ns
ns
µs
C
LOAD
=10pF (Note 6)
MAX976/MAX978 only
C
LOAD
=10pF
MAX998 only, V
CC
= 5V, I
CC
= 10% of typical
2
_______________________________________________________________________________________
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +2.7V to +5.5V, V
CM
= 0V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Wake-Up from Shutdown
Power-Up Delay
SYMBOL
t
EN
t
PU
CONDITIONS
MAX998 only, V
CC
= 5V, I
CC
= 90% of typical
(Note 7)
V
CC
= 0V to 5V step, output valid
MIN
TYP
15
3
MAX
UNITS
µs
µs
MAX976/MAX978/MAX998
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.
__________________________________________Typical Operating Characteristics
(V
CC
= +5V, V
CM
= 0V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT PER COMPARATOR
vs. TEMPERATURE
MAX976 TOC01
SHORT-CIRCUIT OUTPUT CURRENT
vs. TEMPERATURE
MAZX976 TOC2
OUTPUT LOW VOLTAGE vs.
OUTPUT SINK CURRENT
1.4
OUTPUT LOW VOLTAGE (V)
1.2
1.0
0.8
0.6
0.4
0.2
V
CC
= 5.5V
V
CC
= 2.7V
MAX976 TOC03
375
SUPPLY CURRENT PER COMPARATOR (µA)
V
CC
= 5.5V,
V
OUT
= HIGH
V
CC
= 2.7V,
V
OUT
= HIGH
110
100
90
OUTPUT CURRENT (mA)
80
70
60
50
40
30
20
10
-60
V
CC
= 2.7V, SINKING
-40
-20
0
20
40
60
80
V
CC
= 2.7V, SOURCING
V
CC
= 5.5V, SINKING
V
CC
= 5.5V, SOURCING
1.6
325
275
225
175
125
-60
-40
-20
0
V
CC
= 5.5V,
V
OUT
= LOW
V
CC
= 2.7V,
V
OUT
= LOW
20
40
60
80
100
TEMPERATURE (°C)
0
100
0.1
1
10
100
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
OUTPUT HIGH VOLTAGE vs.
OUTPUT SOURCE CURRENT
MAX976 TOC04
PROPAGATION DELAY
vs. TEMPERATURE
MAZX976 TOC5
PROPAGATION DELAY
vs. CAPACITIVE LOAD
V
OD
= 50mV
35
PROPAGATION DELAY (ns)
30
25
20
15
10
MAX976 TOC06
6
V
CC
= 5.5V
5
OUTPUT HIGH VOLTAGE (V)
4
3
2
1
0
0.1
1
10
V
CC
= 2.7V
27
26
PROPAGATION DELAY (ns)
25
24
23
22
21
20
19
18
17
V
CC
= 5.5V
V
OD
= 50mV
C
LOAD
= 15pF
V
CC
= 2.7V
40
100
-60
-40
-20
0
20
40
60
80
100
10
100
CAPACITIVE LOAD (pF)
1000
OUTPUT CURRENT (mA)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
MAX976/MAX978/MAX998
______________________________Typical Operating Characteristics (continued)
(V
CC
= +5V, V
CM
= 0V, T
A
= +25°C, unless otherwise noted.)
PROPAGATION DELAY
vs. INPUT OVERDRIVE
MAX976 TOC07
TRIP POINTS AND OFFSET VOLTAGE
vs. TEMPERATURE
1.5
1.0
0.5
0
-0.5
V
TRIP-
-1.0
-1.5
-2.0
V
TRIP+
V
OS
MAX976 TOC08
INPUT BIAS CURRENT
vs. TEMPERATURE
MAX976 TOC09
90
80
PROPAGATION DELAY (ns)
70
60
50
40
30
20
10
0
1
10
INPUT OVERDRIVE (mV)
C
LOAD
= 15pF
2.0
TRIP POINTS/OFFSET VOLTAGE (V)
100
90
INPUT BIAS CURRENT (nA)
80
V
CC
= 5.5V
70
60
V
CC
= 2.7V
50
40
100
-60
-40
-20
0
20
40
60
80
100
-60
-40
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
INPUT BIAS CURRENT vs.
INPUT COMMON-MODE VOLTAGE
MAX976 TOC10
PROPAGATION DELAY
(t
PD+,
V
CC
= 3V)
MAX976 TOC11
PROPAGATION DELAY
(t
PD-,
V
CC
= 3V)
MAX976 TOC12
100
V
CC
= 2.7V
INPUT BIAS CURRENT (nA)
10
V
CC
= 5.5V
V
OD
= 50mV
C
LOAD
= 15pF
V
IN+
50mV/div
V
IN+
50mV/div
1
0.1
V
OUT
1V/div
V
OUT
1V/div
C
LOAD
= 15pF
V
OD
= 50mV
10ns/div
0.01
-1
0
1
2
3
4
5
6
10ns/div
INPUT COMMON-MODE VOLTAGE (V)
PROPAGATION DELAY
(t
PD+,
V
CC
= 5V)
MAX976 TOC13
PROPAGATION DELAY
(t
PD-,
V
CC
= 5V)
MAX976 TOC14
10MHz RESPONSE
MAX976 TOC15
V
OD
= 50mV
C
LOAD
= 15pF
V
IN+
50mV/div
V
OS
V
IN+
50mV/div
V
CC
OUTPUT
2V/div
V
OUT
2V/div
V
OUT
2V/div
GND
V
OD
= 50mV
C
LOAD
= 15pF
10ns/div
20ns/div
INPUT
50mV/div
10ns/div
4
_______________________________________________________________________________________
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
MAX976/MAX978/MAX998
______________________________Typical Operating Characteristics (continued)
(V
CC
= +5V, V
CM
= 0V, T
A
= +25°C, unless otherwise noted.)
SHUTDOWN DELAY TIME
MAX976 TOC16
WAKE-UP FROM SHUTDOWN
MAX976 TOC17
V
IN+
> V
IN-
SHDN
2V/div
SHDN
2V/div
V
IN+
> V
IN-
V
OUT
2V/div
V
OUT
2V/div
200ns/div
5µs/div
______________________________________________________________Pin Description
PIN
MAX976
SO/µMAX
1, 3
2, 4
5
6, 7
8
—
—
MAX978
SO/QSOP
1, 3, 5, 7
2, 4, 6, 8
9, 13
10, 11,
14, 15
12, 16
—
—
3
4
2
1
6
—
5
MAX998
SOT23-6
SO
3
2
4
6
7
1, 5
8
IN_+
IN_-
GND
OUT_
V
CC
N.C.
SHDN
Comparator Noninverting Input
Comparator Inverting Input
Ground
Comparator Output
Supply Voltage, +2.7V to +5.5V
No Connection. Not internally connected.
Shutdown Input. Drive low for shutdown mode. Drive high or con-
nect to V
CC
for normal operation.
NAME
FUNCTION
__________________Detailed Description
The MAX976/MAX978/MAX998 dual/quad/single com-
parators operate from a single +2.7V to +5.5V supply.
They achieve a 20ns propagation delay while consum-
ing only 225µA of 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. Activate shutdown
mode by driving
SHDN
low.
The MAX976/MAX978/MAX998 comparator inputs have
a common-mode voltage range of -0.2V to (V
CC
- 1.2V).
Either input can be driven to the Absolute Maximum
Ratings limit without false output inversion, as long as
the other input is within the Common-Mode Voltage
Range. Their push/pull output structure is capable of
rail-to-rail operation without external pull-up circuitry,
making these devices ideal for interfacing with
CMOS/TTL logic. All inputs and outputs can tolerate a
continuous short-circuit fault condition to either supply.
The comparator’s internal hysteresis ensures clean out-
put switching, even with slow-moving input signals.
_______________________________________________________________________________________
5

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