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MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
General Description
The MAX961–MAX964/MAX997/MAX999 are low-power,
ultra-high-speed comparators with internal hysteresis. These
devices are optimized for single +3V or +5V operation. The
input common-mode range extends 100mV Beyond-theRails™, and the outputs can sink or source 4mA to within
0.52V of GND and VCC. Propagation delay is 4.5ns (5mV
overdrive), while supply current is 5mA per comparator.
The MAX961/MAX963/MAX964 and MAX997 have a
shutdown mode in which they consume only 270μA supply current per comparator. The MAX961/MAX963 provide complementary outputs and a latch-enable feature.
Latch enable allows the user to hold a valid comparator
output. The MAX999 is available in a tiny 5-pin SOT23
package. The single MAX961/MAX997 and dual MAX962
are available in space-saving 8-pin μMAX® packages.
Applications
●
●
●
●
●
●
●
COMPLEMENTARY
OUTPUT
SHUTDOWN
LATCH
ENABLE
MAX961
1
Yes
Yes
Yes
8 SO/μMAX
MAX962
2
No
No
No
8 SO/μMAX
MAX963
2
Yes
Yes
Yes
14 SO
MAX964
4
No
Yes
No
16 SO/QSOP
MAX997
1
No
Yes
No
8 SO/μMAX
MAX999
1
No
No
No
5 SOT23
PIN-PACKAGE
NO. OF
COMPARATORS
Selector Guide
PART
● Ultra-Fast, 4.5ns Propagation Delay
● Ideal for +3V and +5V Single-Supply Applications
● Beyond-the-Rails Input Voltage Range
● Low, 5mA Supply Current (MAX997/MAX999)
● 3.5mV Internal Hysteresis for Clean Switching
● Output Latch (MAX961/MAX963)
● TTL/CMOS-Compatible Outputs
● Shutdown Mode
(MAX961/MAX963/MAX964/MAX997)
● Available in Space-Saving Packages:
• 5-Pin SOT23 (MAX999)
• 8-Pin μMAX (MAX961/MAX962/MAX997)
• 16-Pin QSOP (MAX964)
Ordering Information
PART
Single 3V/5V Systems
Portable/Battery-Powered Systems
Threshold Detectors/Discriminators
GPS Receivers
Line Receivers
Zero-Crossing Detectors
High-Speed Sampling Circuits
Beyond-the-Rails is a trademark and μMAX is a registered
trademark of Maxim Integrated Products, Inc.
19-1129; Rev 8; 12/20
Features
PIN-PACKAGE
TOP MARK
MAX961ESA
8 SO
—
MAX961EUA-T
8 µMAX
—
MAX962ESA
8 SO
—
MAX962EUA-T
8 µMAX
—
MAX963ESD
14 SO
—
MAX964ESE
16 Narrow SO
—
MAX964EEE
16 QSOP
—
MAX997ESA
8 SO
—
MAX997EUA-T
8 µMAX
—
MAX999AAUK+T
5 SOT23
+AFEI
MAX999EUK-T
5 SOT23
ACAB
Note: All E grade devices are specified over the -40°C to
+85°C operating temperature range. MAX999AAUK is specified
over the -40°C to +125°C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configurations
TOP VIEW
Q 1
GND 2
IN+ 3
5
VCC
4
IN-
MAX999
SOT23
Pin Configurations continued at end of data sheet.
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
Absolute Maximum Ratings
Supply Voltage, VCC to GND...................................-0.3V to +6V
All Other Pins............................................ -0.3V to (VCC + 0.3V)
Current into Input Pins......................................................±20mA
Duration of Output Short Circuit to GND or VCC.......Continuous
Continuous Power Dissipation (TA = +70°C)
5-Pin SOT23 (derate 3.90mW/°C above +70°C).......312.6mW/°C
8-Pin SO (derate 5.88mW/°C above +70°C)...........471mW/°C
8-Pin μMAX (derate 4.10mW/°C above +70°C)......330mW/°C
14-Pin SO (derate 8.33mW/°C above +70°C).........667mW/°C
16-Pin SO (derate 8.70mW/°C above +70°C).........696mW/°C
16-Pin QSOP (derate 8.33mW/°C above +70°C)...667mW/°C
Operating Temperature Range
MAX96_E/MAX99_E....................................... -40°C to +85°C
MAX999AAUK............................................... -40°C to +125°C
Storage Temperature Range............................. -65°C to +160°C
Lead Temperature (soldering, 10s).................................. +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
(VCC = +2.7V to +5.5V, VCM = 0V, COUT = 5pF, VSHDN = 0V, VLE = 0V, unless otherwise noted. TMIN to TMAX is -40°C to +85°C for
all E grade devices. For MAX999AAUK only, TMIN to TMAX is -40°C to +125°C.) (Note 1)
PARAMETER
Supply Voltage
Input Common-Mode
Voltage Range
Input-Referred Trip Points
SYMBOL
VCC
CONDITIONS
Inferred by PSRR
Input Bias Current
www.maximintegrated.com
TYP
MAX
MIN
2.7
5.5
2.7
5.5
V
-0.1
VCC +
0.1
-0.1
VCC +
0.1
V
±2.0
±3.5
±6.5
VTRIP
±2.0
±3.5
±8.0
±2.0
±3.5
±4.0
µMAX, SOT23
±0.5
±1.5
±4.5
±0.5
±1.5
±6.0
±0.5
±1.5
±2.0
±15
±30
±15
±15
3.5
VOS
IB
VCM = -0.1V
or 5.1V,
MAX999AAUK
VCC = 5V
All other E
(Note 4)
packages
VIN+ = VIN- µMAX, SOT23
= 0V or VCC,
All other E
VCC = 5V
packages
VCC = 5.5V, VIN- = 0V,
IIN+ = 100µA
UNITS
MAX
µMAX, SOT23
VCM = -0.1V
or 5.1V,
MAX999AAUK
VCC = 5V
All other E
(Note 3)
packages
Input Capacitance
Common-Mode Input
Impedance
TYP
(Note 2)
Differential Input Clamp
Voltage
Differential Input
Impedance
MIN
TMIN to TMAX
VCMR
Input-Referred Hysteresis
Input Offset Voltage
TA = +25ºC
mV
mV
mV
µA
2.1
V
3
pF
RIND
VCC = 5V
8
kΩ
RINCM
VCC = 5V
130
kΩ
Maxim Integrated │ 2
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
Electrical Characteristics (continued)
(VCC = +2.7V to +5.5V, VCM = 0V, COUT = 5pF, VSHDN = 0V, VLE = 0V, unless otherwise noted. TMIN to TMAX is -40°C to +85°C for
all E grade devices. For MAX999AAUK only, TMIN to TMAX is -40°C to +125°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Common-Mode Rejection
Ratio
CMRR
VCC = 5V,
µMAX, SOT23
VCM = -0.1V
to 5.1V
All other E
(Note 5)
packages
Power-Supply Rejection
Ratio
PSRR
VCM = 0V (Note 6)
Output High Voltage
Output Low Voltage
VOH
ISOURCE =
4mA
VOL
ISINK =
4mA
Capacitive Slew Current
TA = +25ºC
MIN
Shutdown Supply Current
per Comparator
MIN
0.1
0.3
1.0
0.1
0.3
0.5
0.05
0.3
0.3
VCC 0.52
VCC 0.52
MAX999AAUK
VCC 0.52
VCC 0.55
TYP
MAX
0.52
0.52
MAX999AAUK
0.52
0.55
30
60
ISHDN
Logic-Input High
VIH
Logic-Input Low
VIL
mV/V
V
pF
MAX961/MAX963, VCC = 5V
7.2
MAX962/MAX964, VCC = 5V
5
8
9
MAX997/MAX999E, VCC = 5V
5
6.5
6.5
MAX999AAUK, VCC = 5V
5
6.5
7.0
0.27
0.5
0.5
mA
1
20
µA
MAX961/MAX963/MAX964/
MAX997, VCC = 5V
MAX961/MAX963/MAX964/
MAX997, VOUT = 5V and
VCC - 5V
tR, tF
mV/V
mA
4
ICC
UNITS
V
E grade
VOUT = 1.4V, VCC = 2.7V
Shutdown Output
Leakage Current
Rise/Fall Time
MAX
E grade
Output Capacitance
Supply Current per
Comparator
TMIN to TMAX
TYP
VCC = 5V
11
11
2.3
ns
VCC/2
+ 0.4
VCC/2
+ 0.4
V
VCC/2
- 0.4
VCC/2
- 0.4
V
±15
±30
µA
Logic-Input Current
IIL, IIH
Propagation Delay
tPD
5mV
overdrive
(Note 7)
Differential Propagation
Delay
tPD
Between any two channels
or outputs (Q/Q)
0.3
ns
Propagation-Delay Skew
tSKEW
Between tPD- and tPD+
0.3
ns
www.maximintegrated.com
VLOGIC = 0V or VCC
mA
E grade
4.5
7.0
8.5
MAX999AAUK
4.5
7.0
10
ns
Maxim Integrated │ 3
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
Electrical Characteristics (continued)
(VCC = +2.7V to +5.5V, VCM = 0V, COUT = 5pF, VSHDN = 0V, VLE = 0V, unless otherwise noted. TMIN to TMAX is -40°C to +85°C for
all E grade devices. For MAX999AAUK only, TMIN to TMAX is -40°C to +125°C.) (Note 1)
TMIN to TMAX
MIN
TYP
MAX
SYMBOL
Data-to-Latch Setup Time
tSU
MAX961/MAX963 (Note 8)
5
5
ns
Latch-to-Data Hold Time
CONDITIONS
TA = +25ºC
MIN
TYP
MAX
PARAMETER
UNITS
tH
MAX961/MAX963 (Note 8)
5
5
ns
Latch Pulse Width
tLPW
MAX961/MAX963 (Note 8)
5
5
ns
Latch Propagation Delay
tLPD
MAX961/MAX963 (Note 8)
10
10
ns
Shutdown Time
tOFF
Delay until output is high-Z
(> 10kΩ)
150
ns
Shutdown Disable Time
tON
Delay until output is valid
250
ns
Note 1: The MAX961EUA/MAX962EUA/MAX997EUA/MAX999EUK are 100% production tested at TA = +25°C; all temperature
specifications are guaranteed by design.
Note 2: Inferred by CMRR. Either input can be driven to the absolute maximum limit without false output inversion, provided that the
other input is within the input voltage range.
Note 3: The input-referred trip points are the extremities of the differential input voltage required to make the comparator output
change state. The difference between the upper and lower trip points is equal to the width of the input-referred hysteresis
zone. (See Figure 1.)
Note 4: Input offset voltage is defined as the mean of the trip points.
Note 5: CMRR = (VOSL - VOSH) / 5.2V, where VOSL is the offset at VCM = -0.1V and VOSH is the offset at VCM = 5.1V.
Note 6: PSRR = (VOS2.7 - VOS5.5) / 2.8V, where VOS2.7 is the offset voltage at VCC = 2.7V, and VOS5.5 is the offset voltage at
VCC = 5.5V.
Note 7: Propagation delay for these high-speed comparators is guaranteed by design characterization because it cannot be accurately
measured using automatic test equipment. A statistically significant sample of devices is characterized with a 200mV step and
100mV overdrive over the full temperature range. Propagation delay can be guaranteed by this characterization, since DC
tests ensure that all internal bias conditions are correct. For low overdrive conditions, VTRIP is added to the overdrive.
Note 8: Guaranteed by design.
www.maximintegrated.com
Maxim Integrated │ 4
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
Typical Operating Characteristics
(VCC = +3.0V, CLOAD = 5pF, 5mV of overdrive, TA = +25°C, unless otherwise noted.)
PROPAGATION DELAY
vs. INPUT OVERDRIVE
5.5
5.0
tPD-
4.0
5.6
5.4
5.0
10 20 30 40 50 60 70 80 90 100
-40
-20
0
20
40
60
4
85
MAX997toc03
20
40
60
80
100
OUTPUT HIGH VOLTAGE
vs. SOURCE CURRENT
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
MAX997toc04
2.80
TA = +85°C
2.75
0.5
TA = +25°C
VOL (V)
2.65
3.5
4.0
4.5
5.0
5.5
6.0
2.50
120
0.4
TA = -40°C
0.3
TA = -40°C
TA = +25°C
TA = +85°C
0.2
0.1
2.55
tPD+
1
10
100
1000
0
10,000
1
10
100
1000
10,000
SUPPLY VOLTAGE (V)
SOURCE CURRENT (µA)
SINK CURRENT (µA)
MAX961/MAX963
SUPPLY CURRENT PER COMPARATOR
vs. SUPPLY VOLTAGE
MAX962/MAX964
SUPPLY CURRENT PER COMPARATOR
vs. SUPPLY VOLTAGE
MAX997/MAX999
SUPPLY CURRENT PER COMPARATOR
vs. SUPPLY VOLTAGE
TA = +25°C
6.5
TA = -40°C
2
3
4
TA = +85°C
5
TA = +25°C
TA = -40°C
4
MAX9997toc7C
8
7
6
TA = +25°C
TA = +85°C
5
4
5
SUPPLY VOLTAGE (V)
www.maximintegrated.com
6
SUPPLY CURRENT (mA)
SUPPLY CURRENT (mA)
TA = +85°C
7.0
9
MAX997toc07B
7
MAX997toc07A
7.5
6.0
0
PROPAGATION DELAY
vs. SUPPLY VOLTAGE
2.60
8.0
5
CAPACITIVE LOAD (pF)
tPD-
3.0
tPD+
TEMPERATURE (°C)
5.5
2.5
6
INPUT OVERDRIVE (mV)
2.70
5.0
tPD-
5.2
VOH (V)
PROPAGATION DELAY (ns)
tPD-
5.8
7
MAX997toc06
0
tPD+
6.0
tPD+
6.0
SUPPLY CURRENT (mA)
6.2
MAX997toc05
3.5
6.4
8
PROPAGATION DELAY (ns)
6.0
MAX997toc0202
6.5
4.5
6.6
PROPAGATION DELAY (ns)
PROPAGATION DELAY (ns)
7.0
PROPAGATION DELAY
vs. CAPACITIVE LOAD
6.8
MAX997toc01
7.5
PROPAGATION DELAY
vs. TEMPERATURE
6
3
2
3
4
5
SUPPLY VOLTAGE (V)
6
3
TA = -40°C
2
3
4
5
6
SUPPLY VOLTAGE (V)
Maxim Integrated │ 5
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
Typical Operating Characteristics (continued)
(VCC = +3.0V, CLOAD = 5pF, 5mV of overdrive, TA = +25°C, unless otherwise noted.)
VCC = 2.7V
20
-3
80
MAX997toc10
-2
VTRIP-
-3
20
0
40
60
-4
85
2
3
4
5
6
INPUT BIAS CURRENT/INPUT OFFSET
CURRENT vs. TEMPERATURE
SHORT-CIRCUIT OUTPUT CURRENT
vs. TEMPERATURE
VCC = 5.0V
VIN = VOS
NEGATIVE
VALUES
REPRESENT
CURRENT
FLOWING INTO
THE DEVICE
TA = +25ºC
0
TA = -40ºC
-4
-6
0
1
2
3
4
5
6
4.0
IB-
3.5
IB+
3.0
2.5
2.0
1.5
1.0
0.5
IOS
0
-0.5
-40
-20
0
20
40
60
140
OUTPUT SHORTED
TO VCC (SINKING)
120
100
OUTPUT SHORTED
TO GND (SOURCING)
80
60
40
20
0
80
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (ºC)
VCM (V)
MAX997toc13
INPUT BIAS CURRENT (IB+, IB-)
vs. COMMON-MODE VOLTAGE
TA = +85ºC
-1
-20
VOS
-1
SUPPLY VOLTAGE (V)
2
-8
0
VTRIP-40
VTRIP+
1
TEMPERATURE (°C)
4
-2
60
40
2
TEMPERATURE (°C)
6
IB+, IB- (µA)
0
3
SHORT-CIRCUIT CURRENT (µA)
8
-20
-1
MAX997toc12
-40
VOS
-2
INPUT BIAS/OFFSET CURRENT (µA)
60
1
0
4
TRIP POINT / VOS (mV)
160
VOLTAGE TRIP POINT/INPUT OFFSET
VOLTAGE vs. SUPPLY VOLTAGE
VTRIP+
2
TRIP POINT / VOS (mV)
210
110
3
MAX997toc08
VCC = 5.0V
260
MAX997toc11
SHUTDOWN SUPPLY CURRENT (µA)
310
VOLTAGE TRIP POINT/INPUT OFFSET
VOLTAGE vs. TEMPERATURE
MAX997toc09
MAX961/MAX963/MAX964/MAX997
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX997toc14
50MHz RESPONSE
VIN = 100mVP-P
INPUT
50mV/div
VOS
OUTPUT
1V/div
GND
5ns/div
www.maximintegrated.com
Maxim Integrated │ 6
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
Typical Operating Characteristics (continued)
(VCC = +3.0V, CLOAD = 5pF, 5mV of overdrive, TA = +25°C, unless otherwise noted.)
PROPAGATION DELAY (tPD-)
PROPAGATION DELAY (tPD+)
MAX997toc15
MAX997toc16
GND
INPUT
50mV/div
INPUT
50mV/div
GND
OUTPUT
1V/div
OUTPUT
1V/div
GND
GND
5ns/div
5ns/div
Pin Description
PIN
NAME
FUNCTION
MAX997
MAX999
MAX961
MAX962
MAX963
MAX964
1, 5
—
—
—
—
—
N.C.
2
4
2
2
1
1
IN-, INA-
Comparator A Inverting Input
3
3
1
1
2
2
IN+, INA+
Comparator A Noninverting Input
—
—
4
—
3, 5
—
LE, LEA,
LEB
Latch-Enable Input. The output latches when
LE_ is high. The latch is transparent when LE_
is low.
4
2
5
5
4, 11
12
GND
Ground
—
—
—
—
—
16
N.C.
No Connection. Connect to GND to prevent
parasitic feedback.
—
—
—
4
6
3
INB-
Comparator B Inverting Input
—
—
—
3
7
4
INB+
Comparator B Noninverting Input
—
—
—
—
—
5
INC-
Comparator C Inverting Input
—
—
—
—
—
6
INC+
Comparator C Noninverting Input
—
—
—
—
—
7
IND-
Comparator D Inverting Input
—
—
—
—
—
8
IND+
Comparator D Noninverting Input
8
—
3
—
8
9
SHDN
Shutdown Input. The device shuts down when
SHDN is high.
—
—
—
6
9
14
QB
Comparator B Output
—
—
—
—
—
11
QC
Comparator C Output
—
—
—
—
—
10
QD
Comparator D Output
—
—
—
—
10
—
QB
Comparator B Complementary Output
7
5
8
8
12
13
VCC
Positive Supply Input (VCC to GND must be
≤5.5V)
6
1
6
7
13
15
Q, QA
Comparator A TTL Output
—
—
7
—
14
—
Q, QA
Comparator A Complementary Output
www.maximintegrated.com
No Connection. Not internally connected.
Maxim Integrated │ 7
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
Detailed Description
teresis effectively causes one comparator input voltage to
move quickly past the other, thus taking the input out of
the region where oscillation occurs. Standard comparators require hysteresis to be added with external resistors.
The fixed internal hysteresis eliminates these resistors.
The MAX961–MAX964/MAX997/MAX999 single-supply
comparators feature internal hysteresis, ultra-high-speed
operation, and low power consumption. Their outputs are
guaranteed to pull within 0.52V of either rail without external pullup or pulldown circuitry. Beyond-the-Rails input
voltage range and low-voltage, single-supply operation
make these devices ideal for portable equipment. These
comparators all interface directly to CMOS logic.
Timing
Most high-speed comparators oscillate in the linear region
because of noise or undesirable parasitic feedback. This
can occur when the voltage on one input is close to or
equal to the voltage on the other input. These devices
have a small amount of internal hysteresis to counter
parasitic effects and noise.
The added hysteresis of the MAX961–MAX964/MAX997/
MAX999 creates two trip points: one for the rising input
voltage and one for the falling input voltage (Figure 1).
The difference between the trip points is the hysteresis.
When the comparator’s input voltages are equal, the hys-
The MAX961/MAX963 include internal latches that allow
storage of comparison results. LE has a high input
impedance. If LE is low, the latch is transparent (i.e., the
comparator operates as though the latch is not present).
The comparator’s output state is stored when LE is pulled
high. All timing constraints must be met when using the
latch function (Figure 2).
Input Stage Circuitry
The MAX961–MAX964/MAX997/MAX999 include internal
protection circuitry that prevents damage to the precision input stage from large differential input voltages.
This protection circuitry consists of two groups of three
front-to-back diodes between IN+ and IN-, as well as two
200Ω resistors (Figure 3). The diodes limit the differential
voltage applied to the comparator’s internal circuitry to no
more than 3VF, where VF is the diode’s forward-voltage
drop (about 0.7V at +25°C).
VTRIP+
VIN+
VHYST
VOS =
VTRIP+ + VTRIP2
VIN- = 0V
VTRIP-
VOH
Q
VOL
Q
VOH
VOL
Figure 1. Input and Output Waveforms, Noninverting Input Varied
www.maximintegrated.com
Maxim Integrated │ 8
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
tSU
tH
DIFFERENTIAL
V
INPUT OS
VOLTAGE
tLPW
VCC
VCC
2
LE
0V
tPD
tLPD
VOH
VCC
2
Q
VOL
Q
VCC
2
tSKEW
tSKEW
Figure 2. MAX961/MAX963 Timing Diagram
MAX961–MAX964
MAX997
MAX999
IN+
IN-
200Ω
200Ω
For a large differential input voltage (exceeding 3VF), this
protection circuitry increases the input bias current at IN+
(source) and IN- (sink).
Input current =
(IN+ − IN− ) − 3VF
2 × 200
TO INTERNAL
CIRCUITRY
Input currents with large differential input voltages should
not be confused with input bias currents (IB). As long as
the differential input voltage is less than 3VF, this input
current is less than 2IB.
TO INTERNAL
CIRCUITRY
The input circuitry allows the MAX961–MAX964/MAX997/
MAX999’s input common-mode range to extend 100mV
beyond both power-supply rails. The output remains in
the correct logic state if one or both inputs are within the
common-mode range. Taking either input outside the
common-mode range causes the input to saturate and the
propagation delay to increase.
Figure 3. Input Stage Circuitry
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Maxim Integrated │ 9
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
VCC
ISOURCE
MAX961–MAX964
MAX997
MAX999
Q, Q
ISINK
GND
Figure 4. Output Stage Circuitry
Figure 5. MAX961 PCB Layout
Output Stage Circuitry
Applications Information
The MAX961–MAX964/MAX997/MAX999 contain a current-driven output stage, as shown in Figure 4. During an
output transition, ISOURCE or ISINK is pushed or pulled to
the output pin. The output source or sink current is high
during the transition, creating a rapid slew rate. Once the
output voltage reaches VOH or VOL, the source or sink
current decreases to a small value, capable of maintaining the VOH or VOL in static condition. This decrease in
current conserves power after an output transition has
occurred.
One consequence of a current-driven output stage is a
linear dependence between the slew rate and the load
capacitance. A heavy capacitive load slows down the voltage output transition.
Shutdown Mode
When SHDN is high, the MAX961/MAX963/MAX964/
MAX997 shut down. When shut down, the supply current
drops to 270μA per comparator, and the outputs become
high impedance. SHDN has a high input impedance.
Connect SHDN to GND for normal operation. Exit shutdown with LE low; otherwise, the output is indeterminate.
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Circuit Layout and Bypassing
The MAX961–MAX964/MAX997/MAX999’s high bandwidth requires a high-speed layout. Follow these layout
guidelines:
1) Use a PCB with a good, unbroken, low-inductance
ground plane.
2) Place a decoupling capacitor (a 0.1μF ceramic surface-mount capacitor is a good choice) as close to
VCC as possible.
3) On the inputs and outputs, keep lead lengths short to
avoid unwanted parasitic feedback around the comparators. Keep inputs away from outputs. Keep impedance between the inputs low.
4) Solder the device directly to the printed circuit board
rather than using a socket.
5) Refer to Figure 5 for a recommended circuit layout.
6) For slow-moving input signals, take care to prevent
parasitic feedback. A small capacitor (1000pF or less)
placed between the inputs can help eliminate oscillations in the transition region. This capacitor causes
negligible degradation to tPD when the source impedance is low.
Maxim Integrated │ 10
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
Pin Configurations
TOP VIEW
8
VCC
INA+ 1
7
Q
INA- 2
SHDN 3
6
Q
LE 4
5
GND
IN+ 1
IN- 2
MAX961
8
VCC
7
QA
INB+ 3
6
QB
INB- 4
5
GND
MAX962
SO/MAX
SO/MAX
INA- 1
14 QA
INA- 1
16 N.C.
INA+
2
13 QA
INA+ 2
15 QA
LEA
3
12 VCC
INB- 3
14 QB
11 GND
INB+ 4
LEB 5
10 QB
INC- 5
12 GND
INB- 6
9
QB
INC+ 6
11 QC
INB+ 7
8
SHDN
IND- 7
10 QD
IND+ 8
9
GND 4
MAX963
SO
MAX964
13 VCC
8
SHDN
7
VCC
IN+ 3
6
Q
GND 4
5
N.C.
N.C. 1
IN- 2
MAX997
SO/MAX
SHDN
SO/QSOP
Chip Information
MAX961/MAX962 TRANSISTOR COUNT: 286
MAX963/MAX964 TRANSISTOR COUNT: 607
MAX997/MAX999 TRANSISTOR COUNT: 142
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Maxim Integrated │ 11
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
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.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
LAND PATTERN NO.
5 SOT23
U5+2
21-0057
90-0174
8 SO
S8-2
21-0041
90-0096
8 µMAX
U8-1
21-0036
90-0092
14 SO
S14-1
21-0041
90-0112
16 SO
S16-1
21-0041
90-0097
16 QSOP
E16-1
21-0055
90-0167
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Maxim Integrated │ 12
MAX961–MAX964/
MAX997/MAX999
Single/Dual/Quad, Ultra-High-Speed, +3V/+5V,
Beyond-the-Rails Comparators
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
9/96
Initial release
1
12/96
Added 8-pin µMAX packages. Correct minor errors.
1, 2, 3
—
2
3/97
Added dual and quad MAX963/MAX964 packages.
1, 2, 3
3
7/97
Added new MAX997 and MAX999 parts.
4
3/99
New wafer fab/process change to CB20. Update specifications and TOCs.
5
2/07
Added new Current into Input Pins in the Absolute Maximum Ratings.
6
12/08
Added new MAX999AAUK part and specifications.
7
9/14
Removed automotive reference from Revision History.
8
12/20
Updated Absolute Maximum Ratings and Package Information.
1, 2, 3
2, 3, 4, 5, 6
2
1, 2, 3
13
2, 12
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
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 specifications 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.
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