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MAX976ESAN/a48avaiSingle/Dual/Quad / SOT23 / Single-Supply / High-Speed / Low-Power Comparators
MAX976EUAMAXIMN/a4avaiSingle/Dual/Quad / SOT23 / Single-Supply / High-Speed / Low-Power Comparators
MAX978EEEMAXIMN/a43avaiSingle/Dual/Quad / SOT23 / Single-Supply / High-Speed / Low-Power Comparators
MAX978ESEMAXIMN/a7avaiSingle/Dual/Quad / SOT23 / Single-Supply / High-Speed / Low-Power Comparators


MAX976ESA ,Single/Dual/Quad / SOT23 / Single-Supply / High-Speed / Low-Power Comparatorsfeatures a' 1nA Shutdown Supply Currentlow-power shutdown mode that places the output in ahigh-impe ..
MAX976ESA+ ,Single/Dual/Quad, SOT23, Single-Supply, High-Speed, Low-Power ComparatorsELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, V = 0V, T = -40°C to +85°C, unless otherwise noted. ..
MAX976ESA+T ,Single/Dual/Quad, SOT23, Single-Supply, High-Speed, Low-Power Comparatorsapplications. They achieve a20ns propagation delay while consuming only 225µA ♦ 225µA Supply Curren ..
MAX976EUA ,Single/Dual/Quad / SOT23 / Single-Supply / High-Speed / Low-Power ComparatorsELECTRICAL CHARACTERISTICS(V = +2.7V to +5.5V, V = 0V, T = -40°C to +85°C, unless otherwise noted. ..
MAX9770ETI ,1.2W Low-EMI / Filterless / Mono Class D Amplifier with Stereo DirectDrive Headphone AmplifiersELECTRICAL CHARACTERISTICS(V = PV = CPV = 3.3V, GND = PGND = CPGND = 0V, SHDN = 3.3V, C1 = C2 = 1µF ..
MAX9770ETI+ ,1.2W, Low-EMI, Filterless, Mono Class D Amplifier with Stereo DirectDrive Headphone AmplifiersELECTRICAL CHARACTERISTICS(V = PV = CPV = 3.3V, GND = PGND = CPGND = 0V, SHDN = 3.3V, C1 = C2 = 1µF ..
MB89475 ,F2MC-8L/Low Power/Low Voltage Microcontrollersapplications forconsumer product.2* : F MC stands for FUJITSU Flexible Microcontroller.n
MB89535A ,F2MC-8L/Low Power/Low Voltage MicrocontrollersFEATURES• Wide range of package options• Two types of QFP packages (1 mm pitch, 0.65 mm pitch) • LQ ..
MB89535A ,F2MC-8L/Low Power/Low Voltage MicrocontrollersFUJITSU SEMICONDUCTORDS07-12547-4EDATA SHEET8-bit Original Microcontroller CMOS2F MC-8L MB89530A Se ..
MB89537A , 8-bit Original Microcontroller CMOS, F-2MC-8L MB89530A Series
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MB89537AC , 8-bit Original Microcontroller CMOS, F-2MC-8L MB89530A Series


MAX976ESA-MAX976EUA-MAX978EEE-MAX978ESE
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.
________________________Applications

Battery-Powered Systems
Threshold Detectors/Discriminators
3V Systems
IR Receivers
Digital Line Receivers
____________________________Features
Single-Supply Operation Down to 2.7V20ns Propagation Delay225µA Supply Current1nA Shutdown Supply CurrentRail-to-Rail OutputsGround-Sensing InputsInternal Hysteresis Ensures Clean SwitchingAvailable in Space-Saving Packages:
SOT23-6 (MAX998)
µMAX (MAX976)
QSOP-16 (MAX978)
MAX976/MAX978/MAX998
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
__________________Pin Configurations
___________Typical Operating Circuit

19-1299; Rev 1; 1/98
Rail-to-Rail is a registered trademark of Nippon Motorola Ltd.
MAX976/MAX978/MAX998
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
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.) (Note1)
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).............................................................+6VSHDN(MAX998).........................................................-0.3V to 6V
All Other Pins..............................................-0.3V to (VCC+ 0.3V)
Duration of Output Short Circuit to GND or VCC........Continuous
Continuous Power Dissipation (TA= +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
MAX976/MAX978/MAX998
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
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.) (Note1)
Note 1:
The MAX998EUT specifications are 100% tested at TA= +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:
VOSis 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, VTRIP(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 tENcan be as high as 60µs.
__________________________________________Typical Operating Characteristics

(VCC= +5V, VCM= 0V, TA= +25°C, unless otherwise noted.)
MAX976/MAX978/MAX998
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
______________________________Typical Operating Characteristics (continued)

(VCC= +5V, VCM= 0V, TA= +25°C, unless otherwise noted.)
MAX976/MAX978/MAX998
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
______________________________________________________________Pin Description
__________________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 SHDNlow.
The MAX976/MAX978/MAX998 comparator inputs have
a common-mode voltage range of -0.2V to (VCC- 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.
______________________________Typical Operating Characteristics (continued)

(VCC= +5V, VCM= 0V, TA= +25°C, unless otherwise noted.)
Hysteresis
High-speed comparators can oscillate in the linear
operating region because of noise or undesired para-
sitic feedback. This tends to occur when the voltage on
one input is equal to or very close to the voltage on the
other input. The MAX976/MAX978/MAX998 have inter-
nal hysteresis to counter parasitic effects and noise.
The hysteresis in a comparator 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 input
voltages are equal, the hysteresis effectively causes
one comparator input voltage to move quickly past the
other, taking the input out of the region where oscilla-
tion occurs.
Figure 1 illustrates the case where IN- has a fixed volt-
age applied and IN+ is varied. If the inputs were
reversed, the figure would be the same, except with an
inverted output.
Input-Stage Circuitry

The MAX976/MAX978/MAX998 input common-mode
voltage range is from -0.2V to (VCC- 1.2V). The voltage
range for each comparator input extends to both VCC
and GND. The output remains in the correct logic state
while one or both of the inputs are within the common-
mode range. If both input levels are out of the common-
mode range, input-stage current saturation occurs, and
the output becomes unpredictable.
Shutdown Mode

The MAX998 features a low-power shutdown mode,
which is activated by forcing SHDNlow. Shutdown
mode reduces the supply current to 1nA (typical), dis-
ables the comparator, and places the output in a high-
impedance state. Drive SHDNhigh to enable the
comparator. Do not leave SHDNunconnected. Since it
is a high-impedance input, leaving SHDNunconnected
could result in indeterminate logic levels, adversely
affecting comparator operation. Likewise, do not three-
state SHDN. Due to the output leakage currents of
three-state devices and the small internal current forSHDN, three-stating this pin could also result in indeter-
minate logic levels.
The maximum input voltage for SHDNis 6V, referred to
GND, and is not limited by VCC. This allows the use of
5V logic to drive SHDNwhile VCCoperates at a lower
voltage, such as 3V. The logic threshold limits forSHDNare proportional to VCC(see Electrical
Characteristics).
_____________Applications Information
Circuit Layout and Bypassing

The MAX976/MAX978/MAX998 have a high-gain band-
width and require careful board layout. We recommend
the following design guidelines:Use a printed circuit board with an unbroken, low-
inductance ground plane. Surface-mount compo-
nents are recommended.Place a decoupling capacitor (a 0.1µF ceramic
capacitor is a good choice) between VCCand
ground as close to the pins as possible.Keep lead lengths short on the inputs and outputs
to avoid unwanted parasitic feedback around the
comparators.Solder the devices directly to the printed circuit
board instead of using a socket.Minimize input impedance.For slowly varying inputs, use a small capacitor
(~1000pF) across the inputs to improve stability.
Additional Hysteresis

Generate additional hysteresis with three resistors
using positive feedback, as shown in Figure 2. This
positive feedback method slows the hysteresis
response time. Calculate resistor values as follows:Select R3. The leakage current of IN+ is typically
75nA, so the current through R3 should be at least
1.0µA to minimize errors caused by leakage current.
The current through R3 at the trip point is (VREF-
VOUT) / R3. Consider the two possible output states
when solving for R3. The two formulas are:
R3 = VREF / 1.0µA
or
R3 = (VCC- VREF) / 1.0µA
Use the smaller of the two resulting resistor values.
For example, if VREF= 1.2V and VCC= 5.0V, the two
resistor values are 1.2MΩand 3.8MΩ. Choose a
standard value for R3 of 1.2MΩ.
MAX976/MAX978/MAX998
Single/Dual/Quad, SOT23, Single-Supply,
High-Speed, Low-Power Comparators
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