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MAX975ESA+ |MAX975ESAMAXIMN/a640avaiSingle/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby
MAX975ESA+ |MAX975ESAMAXN/a72avaiSingle/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby
MAX975ESA+T |MAX975ESATMAXIMN/a62avaiSingle/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby


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MAX975ESA+-MAX975ESA+T
Single/Dual, +3V/+5V Dual-Speed Comparators with Auto-Standby
General Description
The MAX975/MAX977 single/dual comparators feature
three different operating modes, and are optimized for
+3V and +5V single-supply applications. The operating
modes are as follows: highspeed, highspeed with
auto-standby, and lowpower. Propagation delay is 28ns
in high-speed mode, while supply current is only 250μA.
Supply current is reduced to 3µA in low-power mode.
The auto-standby feature allows the comparator to
automatically change from low-power mode to high-
speed mode upon receipt of an input signal. In the
absence of an input signal, the comparator reverts
back to low-power mode after an adjustable timeout
period. The timeout period for the MAX975 to enter
standby is set by a single capacitor. The dual MAX977
features independentlyadjustable timeout periods for
each comparator using separate capacitors.
The MAX975/MAX977’s inputs have a common-mode
voltage range of -0.2V to (VCC- 1.2V). The differential
input voltage range extends rail to rail. The 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 condition to either rail. The
comparator’s internal hysteresis in high-speed mode
ensures clean output switching, even with slow-moving
input signals.
The single MAX975 is available in 8-pin SO and 8-pin
μMAX®packages, while the dual MAX977 is available
in 14-pin SO and 16-pin QSOP packages.
________________________Applications

Battery-Powered Systems
RF ID Tags
Keyless Entry
Threshold Detectors/Discriminators
3V Systems
IR Receivers
Digital-Line Receivers
____________________________Features
Three Operating Modes:
HighSpeed
HighSpeed with Auto-Standby
LowPower
28ns Propagation Delay (high-speed mode)5µA Max Supply Current in Low-Power/
Auto-Standby Modes
+3V/+5V Single-Supply OperationRail-to-Rail OutputsGround-Sensing InputInternal Hysteresis (high-speed mode)Adjustable Timeout PeriodµMAX Package (MAX975)
QSOP-16 Package (MAX977)
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
Functional Diagram

19-1141; Rev 2; 2/07
Ordering Information
Pin Configurations appear at end of data sheet.

MAX975
VCC
IN+LP
OUT
GND
STO
HIGH SPEED
LOW POWER
ENABLE
IN-
STAT
TIMING
CIRCUIT
ENABLE
TRANSITION
MONITOR
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODE
MAX975ESA
-40°C to +85°C8 SOS8-2
MAX975EUA-T-40°C to +85°C8 µMAX-8U8-1
MAX977ESD
-40°C to +85°C14 SOS14-1
MAX977EEE-40°C to +85°C16 QSOPE16-1
µMAX is a registered trademark of Maxim Integrated Products, Inc.
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= +2.7V to +5.25V, specifications are for high-speed mode, TA= -40°C to +85°C, unless otherwise noted. Typical values are at= +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
All Other Pins..............................................-0.3V to (VCC+ 0.3V)
Current into Input Pins......................................................±20mA
Duration of Output ShortCircuit to GND_ or VCC......Continuous
Continuous Power Dissipation (TA= +70°C)
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW
8-Pin µMAX (derate 4.10mW/°C above +70°C).............330mW
14-Pin SO (derate 8.33mW/°C above +70°C)................667mW
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 +150°C
Lead Temperature (soldering, 10sec).............................+300°C
ICCSupply Current
Per Comparator3577PSRRPower-Supply
Rejection Ratio902.75.25VCCSupply-Voltage
Operating Range
UNITSMINTYPMAXSYMBOLPARAMETER

High-speed mode
µMAX/QSOP
CONDITIONS

Low-power mode
High-speed mode
Auto-standby/low-power modes
VCM= 1V,
2.7V ≤VCC≤5.25V
Common-Mode
Voltage RangeVCMR(Note 2)-0.2VCC- 1.2V
High-speed mode, TA= +25°C+0.2±2High-speed mode, TA= TMINto TMAX±5
Input Offset Voltage
(Note 3)
VCM= 1V,
VCC= 5V Auto-standby/
low-power modes, = TMINto TMAX0.524Input-Referred HysteresisVHYSVCM= 1V, VCC= 5V (Note 4)µMAX/QSOP0.324mV-100-300High-speed modeµMAX/QSOP-100-400Input Bias Current
Auto-standby/low-power modes-5
Input Offset CurrentIOS±20±100nA
Input CapacitanceCIN3pF6690High-speed modeµMAX/QSOP54Common-Mode
Rejection RatioCMRR-0.2V ≤VCMVCC- 1.2V
Low-power mode82VOS
POWER SUPPLY
COMPARATOR INPUTS
±7μMAX/QSOP
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +5.25V, specifications are for high-speed mode, TA= -40°C to +85°C, unless otherwise noted. Typical values are at= +25°C.) (Note 1)
CLOAD= 10pF,
VCC= 5V
ISINK= 2mA, all modes
High-speed mode,
overdrive = 5mV
Low-power mode,
overdrive = 10mV
ISOURCE= 2mA, all modes
CONDITIONS
0.821.62850
tPD+Propagation Delay, Low to High
(Note 6)0.10.4VOLOUT_ Output Voltage Low0.7xVCCVCC/2VLPIHLP Input Voltage HighVCC-0.4VCC- 0.1VOHOUT_ Output Voltage High
UNITSMINTYPMAXSYMBOLPARAMETER
VCC/20.3xVCCVLPILLP Input Voltage Low
(Note 5)
0.01±1ILPBLP Input Current10tLPLP Fall Time
VCC = 3VµA0.15ISTOSTO_ Source CurrentVCC/20.3xVCCVCILSTO_ Input Voltage Low
CLOAD= 10pF,
VCC= 5V
High-speed mode,
overdrive = 5mV
Low-power mode,
overdrive = 10mVµs0.481.62850
tPD-Propagation Delay, High to Low
(Note 6)
CLOAD= 10pFns2tSKEWPropagation-Delay Skew (Note 6)
MAX977 only, CLOAD= 10pFns1∆tPDPropagation-Delay Matching
CLOAD= 10pF,
VCC= 5.0V
High-speed mode
Low-power mode1.6ns1.6Rise/Fall Time
ISOURCE= 3mA, all modesVVCC - 0.4VSHSTAT_ Output Voltage High
ISINK= 400µA, all modesV0.4VSLSTAT_ Output Voltage Low
DIGITAL INPUTS
DIGITAL OUTPUTS
Note 1:
The MAX975EUA is 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, as long as the
other input is within the specified common-mode input 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:
Guaranteed by design. The LP pin is sensitive to noise. If fall times larger than 10µs are expected, bypass LP to ground
using a 0.1µF capacitor.
Note 6:
Propagation delay is guaranteed by design. For low-overdrive conditions, VOS is added to the overdrive. The following
equation defines propagation-delay skew: tSKEW= tPD+- tPD-.
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +2.7V to +5.25V, specifications are for high-speed mode, TA= -40°C to +85°C, unless otherwise noted. Typical values are at= +25°C.) (Note 1)
CONDITIONS

(Note 9)
10mV overdrive (Note 10)
(Note 8)
tASBAuto-Standby Timeout
tASBE
UNITSMINTYPMAXSYMBOLPARAMETER

Auto-Standby Enable Time24tASDAuto-Standby Wake-Up Time
10mV overdrive (Note 11)
(Note 12)1.6tPWDAuto-Standby Wake-Up Input
or LP Pulse Width0.8tASCDAuto-Standby Comparator
Disable
(Note 13)µs3tLPELow-Power Enable Time
(Note 14)µs1.14tHSEHigh-Speed Enable Time
(Note 15)µs0.7tLPCDLow-Power Comparator Disable
(Note 16)ns20tLPSHLow-Power STAT_ High
AUTO-STANDBY/LOW-POWER TIMING (Note
7;Figure2)
Note 7:
Timing specifications are guaranteed by design.
Note 8:
Set by 1000pF external capacitor at the STO_ pin. tASBis defined as the time from last input transition to STAT_ = high.
Does not include time to go into standby condition (tASBE).
Note 9:
tASBEis defined as the time from when STAT_ goes high to when the supply current drops to 5μA.
Note 10:
tASDis defined as the time from the last input transition to when STAT_ goes low. The comparator is in high-speed mode
before STAT_ is low.
Note 11:
tPWDis defined as the minimum input or LP pulse width to trigger fast-mode operation from auto-standby.
Note 12:
tASCDis defined as the time from the last input transition to when the supply current increases to 300μA.
Note 13:
tLPEis defined as the time from when LP is driven high to when the supply current drops to 5μA.
Note 14:
tHSEis defined as the time from when LP goes low to when STAT goes low. The comparator is in high-speed mode before
STAT_ is low.
Note 15:
tLPCDis defined as the time from when LP goes low to when the supply current increases to 300μA.
Note 16:
tLPSHis defined as the time from when LP goes high to when STAT_ goes high.51016
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby

LOW-POWER OFFSET VOLTAGE
vs. TEMPERATURE
MAX977-01
TEMPERATURE (°C)
OFFSET VOLTAGE (mV)
VCC = 3V
0.01k10k1k0.1k100k1M10M100M
SUPPLY CURRENT PER COMPARATOR
vs. OUTPUT TRANSITION FREQUENCY

MAX977-02
TRANSITION FREQUENCY (kHz)
SUPPLY CURRENT
PER COMPARATOR (
HIGH-SPEED MODE
LOW-POWER MODE
HIGH-SPEED INPUT BIAS CURRENT
vs. TEMPERATURE
MAX977-03
TEMPERATURE (°C)
INPUT BIAS CURRENT (nA)
VCC = 3V
VCC = 5V
LOW-POWER INPUT BIAS CURRENT
vs. TEMPERATURE
MAX977-04
TEMPERATURE (°C)
INPUT BIAS CURRENT (nA)
VCC = 3V
VCC = 5V
LOW-POWER PROPAGATION DELAY
vs. CAPACITIVE LOAD
MAX977-07
CAPACITIVE LOAD (pF)
PROPAGATION DELAY (ns)
VCC = 3V
VCC = 3V
VCC = 5V
VCC = 5V
tPD-
50mV OVERDRIVE
tPD+
HIGH-SPEED VOLTAGE TRIP POINTS/INPUT
OFFSET VOLTAGE vs. TEMPERATURE
MAX977-05
TEMPERATURE (°C)
TRIP POINTS/OFFSET VOLTAGE (mV)
VCC = 5V
VTRIP+
VTRIP-
VOS
HIGH-SPEED VOLTAGE TRIP POINTS/INPUT
OFFSET VOLTAGE vs. TEMPERATURE
MAX977-06
TEMPERATURE (°C)
TRIP POINTS/OFFSET VOLTAGE (mV)
VTRIP-
VOS
VTRIP+
VCC = 3V
LOW-POWER PROPAGATION DELAY
vs. INPUT OVERDRIVE
MAX977-08
INPUT OVERDRIVE (mV)
PROPAGATION DELAY (ns)
VCC = 3V
VCC = 3V
VCC = 5V
VCC = 5V
CLOAD =15pF
tPD-
tPD+
AUTO-STANDBY TIMEOUT
vs. TEMPERATURE
MAX977-09
TEMPERATURE (°C)
TIMEOUT (ms)
VCC = 3V
VCC = 5V
__________________________________________Typical Operating Characteristics

(VCC= 3.0V, TA = +25°C, unless otherwise noted.)
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
____________________________Typical Operating Characteristics (continued)

(VCC = 3.0V, TA= +25°C, unless otherwise noted.)
10000010100100010,000
AUTO-STANDBY TIMEOUT
vs. TIMEOUT CAPACITOR

MAX977-10
CAPACITANCE (pF)
TIMEOUT (
OUTPUT HIGH VOLTAGE
vs. OUTPUT SOURCE CURRENT
MAX977-11
SOURCE CURRENT (mA)
OUTPUT VOLTAGE (V)
VCC = 3V
TA = +85°C
TA = -40°C
TA = +25°C
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
MAX977-12
SINK CURRENT (mA)
OUTPUT VOLTAGE (V)
VCC = 3V
TA = +85°C
TA = +25°C
TA = -40°C
HIGH-SPEED PROPAGATION DELAY
vs. TEMPERATURE (VCC = 5V)
MAX977-13
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
CLOAD = 15pF
VOD = 50mV

tPD+
tPD-
HIGH-SPEED SUPPLY CURRENT
PER COMPARATOR
vs. TEMPERATURE (VCC = 3V)
MAX977-16
TEMPERATURE (°C)
SUPPLY CURRENT (OUT_ = HIGH
OUT_ = LOW
HIGH-SPEED PROPAGATION DELAY
vs. TEMPERATURE (VCC = 3V)
MAX977-14
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
CLOAD = 15pF

tPD+
tPD-
VOD = 50mV
HIGH-SPEED SUPPLY CURRENT
PER COMPARATOR
vs. TEMPERATURE (VCC = 5V)
MAX977-15
TEMPERATURE (°C)
SUPPLY CURRENT (
OUT_ = HIGH
OUT_ = LOW
STANDBY/LOW-POWER SUPPLY
CURRENT PER COMPARATOR
vs. TEMPERATURE (VCC = 5V)
MAX977-17
TEMPERATURE (°C)
SUPPLY CURRENT (
OUT_ = HIGH
OUT_ = LOW
STANDBY/LOW POWER-SUPPLY
CURRENT PER COMPARATOR
vs. TEMPERATURE (VCC = 3V)
MAX977-18
TEMPERATURE (°C)
SUPPLY CURRENT (
OUT = HIGH
OUT = LOW
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby

HIGH-SPEED PROPAGATION DELAY
vs. CAPACITIVE LOAD
MAX977-19
CAPACITIVE LOAD (pF)
PROPAGATION DELAY (ns)
VCC = +3V
VCC = +5V
tPD+
tPD-
tPD+
tPD-
CLOAD = 15pF
VOD = 50mV20406080100120140160180200
HIGH-SPEED PROPAGATION DELAY
vs. INPUT OVERDRIVE

MAX977-20
INPUT OVERDRIVE (mV)
PROPAGATION DELAY (ns)
tPD-
CLOAD = 15pF
VCC = +3V
tPD+ VCC = +5V
LOW-POWER PROPAGATION DELAY
vs. TEMPERATURE (VCC = 3V)
MAX977-21
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
CLOAD = 15pF
VOD = 50mV
tPD+
tPD-
LOW-POWER PROPAGATION DELAY
vs. TEMPERATURE (VCC = 5V)
MAX977-22
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
CLOAD = 15pF
VOD = 50mV
tPD+
tPD-
PROPAGATION DELAY tPD+
HIGH-SPEED MODE (VCC = +3V)

tPD+
INPUT
5mV/div
5ns/div
OUTPUT
1V/div
VOS
VCC
VCC/2
GND
MAX975/977 TOC23
PROPAGATION DELAY tPD-
HIGH-SPEED MODE (VCC = +3V)

tPD-
INPUT
5mV/div
5ns/div
OUTPUT
1V/div
VOS
VCC
VCC/2
GND
MAX975/977 TOC24
PROPAGATION DELAY tPD-
HIGH-SPEED MODE (VCC = +5V)

tPD-
INPUT
5mV/div
5ns/div
OUTPUT
2V/div
VOS
VCC
VCC/2
GND
MAX975/977 TOC25
____________________________Typical Operating Characteristics (continued)

(VCC = 3.0V, TA= +25°C, unless otherwise noted.)
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
____________________________Typical Operating Characteristics (continued)

(VCC= 3.0V, TA= +25°C, unless otherwise noted.)
PROPAGATION DELAY tPD-
LOW-POWER MODE (VCC = +3V)

tPD-
INPUT
5mV/div
100ns/div
OUTPUT
1V/div
VOS
VCC
VCC/2
GND
MAX975/977 TOC27
PROPAGATION DELAY tPD+
LOW-POWER MODE (VCC = +3V)

tPD+
INPUT
5mV/div
100ns/div
OUTPUT
1V/div
VOS
VCC
VCC/2
GND
MAX975/977 TOC28
PROPAGATION DELAY tPD+
LOW-POWER MODE (VCC = +5V)

tPD+
INPUT
5mV/div
100ns/div
OUTPUT
2V/div
VOS
VCC
VCC/2
GND
MAX975/977 TOC29
PROPAGATION DELAY tPD-
LOW-POWER MODE (VCC = +3V)

tPD-
INPUT
5mV/div
100ns/div
OUTPUT
2V/div
VOS
VCC
VCC/2
GND
MAX975/977 TOC30
PROPAGATION DELAY tPD+
HIGH-SPEED MODE (VCC = +5V)

tPD+
INPUT
5mV/div
5ns/div
OUTPUT
2V/div
VOS
VCC
VCC/2
GND
MAX975/977 TOC26
MAX975/MAX977
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
____________________________Typical Operating Characteristics (continued)

(VCC= 3.0V, TA= +25°C, unless otherwise noted.)
10MHz RESPONSE
HIGH-SPEED MODE (VCC = +3V)

INPUT
5mV/div
20ns/div
OUTPUT
1V/div
VOS
VCC
GND
MAX975/977 TOC33
100kHz RESPONSE
LOW-POWER MODE (VCC = +3V)

INPUT
5mV/div
2μs/div
OUTPUT
1V/div
VOS
VCC
GND
MAX975/977 TOC31
10MHz RESPONSE
HIGH-SPEED MODE (VCC = +5V)

INPUT
5mV/div
20ns/div
OUTPUT
2V/div
VOS
VCC
GND
MAX975/977 TOC34
MAX975
AUTO-STANDBY OPERATION

1ms/div
CSTO_ = 100pF
Inp
ICC
OUT
0μA
250μA
+100mV
-100mV
MAX975/977 TOC35
100kHz RESPONSE
LOW-POWER MODE (VCC = +5V)

INPUT
5mV/div
2μs/div
OUTPUT
2V/div
VOS
VCC
GND
MAX975/977 TOC32
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