MAX924ESE ,Ultra Low-Power / Single/Dual-Supply ComparatorsELECTRICAL CHARACTERISTICS: 5V OPERATION (continued)(V+ = 5V, V- = GND = 0V, T = T to T , unless ot ..
MAX924ESE ,Ultra Low-Power / Single/Dual-Supply ComparatorsGeneral Description ________
MAX924ESE+ ,Ultra Low-Power, Single/Dual-Supply ComparatorsELECTRICAL CHARACTERISTICS: 5V OPERATION(V+ = 5V, V- = GND = 0V, T = T to T , unless otherwise note ..
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MAX9310EUP ,1:5 Clock Driver with Selectable LVPECL Inputs and LVDS OutputsApplicationsData and Clock Drivers and BuffersCentral-Office Backplane Clock DistributionDSLAMBase ..
MAX9311ECJ ,1:10 Differential LVPECL/LVECL/HSTL Clock and Data DriversFeaturesThe MAX9311/MAX9313 are low-skew, 1-to-10 differen- +2.25V to +3.8V Differential HSTL/LVPE ..
MB88501H ,HIGH-SPEED CMOS SINGLE CHIP 4-BIT MICROCOMPUTER
MB88503H ,HIGH-SPEED CMOS SINGLE CHIP 4-BIT MICROCOMPUTER
MB8868A ,MOS Universal Asynchronous Receiver / Transmitter (UART)Features
I Full or Hall Duplex
Operation
I Completely Programmable
I Start Bit Generated
..
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MAX924CPE-MAX924CSE-MAX924ESE
Ultra Low-Power / Single/Dual-Supply Comparators
_______________General DescriptionThe MAX921–MAX924 single, dual, and quad micro-
power, low-voltage comparators feature the lowest
power consumption available. These comparators draw
less than 4µA supply current over temperature
(MAX921/MAX922), and include an internal 1.182V
±1% voltage reference, programmable hysteresis, and
TTL/CMOS outputs that sink and source current.
Ideal for 3V or 5V single-supply applications, the
MAX921–MAX924 operate from a single +2.5V to +11V
supply (or a ±1.25V to ±5V dual supply), and each
comparator’s input voltage range swings from the
negative supply rail to within 1.3V of the positive
supply.
The MAX921–MAX924’s unique output stage con-
tinuously sources as much as 40mA. And by eliminating
power-supply glitches that commonly occur when com-
parators change logic states, the MAX921–MAX924
minimize parasitic feedback, which makes them easier to
use.
The single MAX921 and dual MAX923 provide a unique
and simple method for adding hysteresis without
feedback and complicated equations, simply by using
the HYST pin and two resistors.
________________________ApplicationsBattery-Powered Systems
Threshold Detectors
Window Comparators
Oscillator Circuits
____________________________FeaturesµMAX Package—Smallest 8-Pin SO
(MAX921/MAX922/MAX923)Ultra-Low 4µA Max Quiescent Current
Over Extended Temp. Range (MAX921)Power Supplies:
Single +2.5V to +11V
Dual ±1.25V to ±5.5VInput Voltage Range Includes Negative SupplyInternal 1.182V ±1% Bandgap Reference Adjustable Hysteresis TTL/CMOS-Compatible Outputs12µs Propagation Delay (10mV Overdrive)No Switching Crowbar Current40mA Continuous Source Current
______________Ordering Information
Ordering Information continued at end of data sheet.Dice are tested at TA= +25°C, DCparameters only.
** Contact factory for availability and processing to MIL-STD-883.
MAX921–MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators
________________________________________________________________Maxim Integrated Products1
__________Typical Operating Circuit
Call toll free 1-800-998-8800 for free samples or literature.19-0115; Rev 3; 3/95
MAX921–MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators
ABSOLUTE MAXIMUM RATINGSV+ to V-, V+ to GND, GND to V-................................-0.3V, +12V
Inputs
Current, IN_+, IN_-, HYST...............................................20mA
Voltage, IN_+, IN_-, HYST................(V+ + 0.3V) to (V- – 0.3V)
Outputs
Current, REF....................................................................20mA
Current, OUT_.................................................................50mA
Voltage, REF....................................(V+ + 0.3V) to (V- – 0.3V)
Voltage, OUT_ (MAX921/924).....(V+ + 0.3V) to (GND – 0.3V)
Voltage OUT_(MAX922/923)...........(V+ + 0.3V) to (V- – 0.3V)
OUT_ Short-Circuit Duration (V+ ≤5.5V)...............Continuous
Continuous Power Dissipation (TA= +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)...727mW
8-Pin SO (derate 5.88mW/°C above +70°C)................471mW
8-Pin µMAX (derate 4.1mW/°C above +70°C).............330mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C)........640mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW
16-Pin SO (derate 8.70mW/°C above +70°C)................696mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C)......800mW
Operating Temperature Ranges:
MAX92_C_ _.......................................................0°C to +70°C
MAX92_E_ _.....................................................-40°C to +85°C
MAX92_MJ_ ..................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
ELECTRICAL CHARACTERISTICS: 5V OPERATION(V+ = 5V, V- = GND = 0V, TA= TMINto TMAX, unless otherwise noted.)
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.
MAX921–MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS: 5V OPERATION (continued)(V+ = 5V, V- = GND = 0V, TA= TMINto TMAX, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS: 3V OPERATION(V+ = 3V, V- = GND = 0V, TA= TMINto TMAX, unless otherwise noted.)
Note 1:MAX924 comparators work below 2.5V, see Low-Voltage Operationsection for more details.
MAX921–MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics(V+ = 5V, V- = GND, TA = +25°C, unless otherwise noted).
OUTPUT VOLTAGE LOW
vs. LOAD CURRENT
MAX921/4-TOC1
LOAD CURRENT (mA)
(V)
OUTPUT VOLTAGE HIGH vs.
LOAD CURRENT
MAX921/924-TOC2
LOAD CURRENT (mA)
(V)40
REFERENCE OUTPUT VOLTAGE vs.
OUTPUT LOAD CURRENT
MAX921/924-TOC3
OUTPUT LOAD CURRENT (μA)
REFERENCE OUTPUT VOLTAGE (V)20
ELECTRICAL CHARACTERISTICS: 3V OPERATION (continued)
(V+ = 3V, V- = GND = 0V, TA= TMINto TMAX, unless otherwise noted.)
MAX921-MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators
_______________________________________________________________________________________5REFERENCE VOLTAGE
vs. TEMPERATURE
MAX921/924-TOC4
TEMPERATURE (°C)
REFERENCE VOLTAGE (V)100
MAX921
SUPPLY CURRENT vs.
TEMPERATURE
MAX921/924-TOC5
TEMPERATURE (°C)
SUPPLY CURRENT (
MAX922
SUPPLY CURRENT vs. TEMPERATURE
MAX921/924-TOC6
TEMPERATURE (°C)
SUPPLY CURRENT (
MAX923
SUPPLY CURRENT vs. TEMPERATURE
MAX921/924-TOC7
TEMPERATURE (°C)
SUPPLY CURRENT (
HYSTERESIS CONTROL
MAX921/924 TOC10
VREF -VHYST (mV)
IN+ – IN- (V)40
MAX924
SUPPLY CURRENT vs. TEMPERATURE
MAX921/924-TOC8
TEMPERATURE (°C)
SUPPLY CURRENT (
MAX924
SUPPLY CURRENT vs.
LOW SUPPLY VOLTAGES
MAX921/924-TOC9
SINGLE-SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
TRANSFER FUNCTION
4.0MAX921/924-TOC11
IN+ INPUT VOLTAGE (mV)
OUTPUT VOLTAGE (V)
RESPONSE TIME vs.
LOAD CAPACITANCE
MAX921/924 TOC12
LOAD CAPACITANCE (nF)
RESPONSE TIME (80
__________________________________________Typical Operating Characteristics(V+ = 5V, V- = GND, TA = +25°C, unless otherwise noted).
MAX921–MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators
__________________________________________Typical Operating Characteristics(V+ = 5V, V- = GND, TA = +25°C, unless otherwise noted).21018
RESPONSE TIME FOR VARIOUS
INPUT OVERDRIVESMAX921/924-TOC13
RESPONSE TIME (μs)
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (mV)21018
RESPONSE TIME FOR VARIOUS
INPUT OVERDRIVESMAX921/924-TOC14
RESPONSE TIME (μs)
OUTPUT VOLTAGE (V)
INPUT VOLTAGE (mV)
MAX924 RESPONSE TIME
AT LOW SUPPLY VOLTAGES
MAX921/924-TOC15
SINGLE-SUPPLY VOLTAGE (V)
RESPONSE TIME (ms)
MAX924 RESPONSE TIME
AT LOW SUPPLY VOLTAGES
MAX921/924-TOC16
SINGLE-SUPPLY VOLTAGE (V)
CURRENT (mA)
SHORT-CIRCUIT SOURCE CURRENT
vs. SUPPLY VOLTAGE
160MAX121/124-TOC17
TOTAL SUPPLY VOLTAGE (V)
SOURCE CURRENT (mA)
SHORT-CIRCUIT SINK CURRENT
vs. SUPPLY VOLTAGE
MAX121/124-TOC18
TOTAL SUPPLY VOLTAGE (V)
SINK CURRENT (mA)
____________________________________________________________Pin Descriptions
MAX921–MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators
_______________________________________________________________________________________7
_______________________________________________Pin Descriptions (continued)
MAX921–MAX924
Ultra Low-Power,
Single/Dual-Supply Comparators_______________________________________________________________________________________
_______________Detailed DescriptionThe MAX921–MAX924 comprise various combinations
of a micropower 1.182V reference and a micropower
comparator. The Typical Operating Circuitshows the
MAX921 configuration, and Figures 1a-1c show the
MAX922–MAX924 configurations.
Each comparator continuously sources up to 40mA,
and the unique output stage eliminates crowbar
glitches during output transitions. This makes them
immune to parasitic feedback (which can cause
instability) and provides excellent performance, even
when circuit-board layout is not optimal.
Internal hysteresis in the MAX921 and MAX923 provides
the easiest method for implementing hysteresis. It also
produces faster hysteresis action and consumes much
less current than circuits using external positive feedback.
Power-Supply and Input Signal RangesThis family of devices operates from a single +2.5V to
+11V power supply. The MAX921 and MAX924 have a
separate ground for the output driver, allowing
operation with dual supplies ranging from ±1.25V to
±5.5V. Connect V- to GND when operating the
MAX921 and the MAX924 from a single supply. The
maximum supply voltage in this case is still 11V.
For proper comparator operation, the input signal can
swing from the negative supply (V-) to within one volt of
the positive supply (V+ – 1V). The guaranteed
common-mode input voltage range extends from V- to
(V+ - 1.3V). The inputs can be taken above and below
the supply rails by up to 300mV without damage.
Operating the MAX921 and MAX924 at ±5V provides
TTL/CMOS compatibility when monitoring bipolar input
signals. TTL compatibility for the MAX922 and MAX923
is achieved by operation from a single +5V supply.
Low-Voltage Operation: V+ = 1V (MAX924 Only)The guaranteed minimum operating voltage is 2.5V (or
±1.25V). As the total supply voltage is reduced below
2.5V, the performance degrades and the supply
current falls. The reference will not function below
Figure 1a.MAX922 Functional Diagram
Figure 1b.MAX923 Functional Diagram
