_______________General Description
The MAX941/MAX942/MAX944 are single/dual/quad
high-speed comparators optimized for systems pow-
ered from a 3V or 5V supply. These devices combine
high speed, low power, and rail-to-rail inputs.
Propagation delay is 80ns, while supply current is only
350µA per comparator.
The input common-mode range of the MAX941/
MAX942/MAX944 extends beyond both power-supply
rails. The outputs pull to within 0.4V of either supply rail
without external pull-up circuitry, making these devices
ideal for interface with both CMOS and TTL logic. All
input and output pins can tolerate a continuous short-
circuit fault condition to either rail.
Internal hysteresis ensures clean output switching,
even with slow-moving input signals. The MAX941 fea-
tures latch enable and device shutdown.
The single MAX941 and dual MAX942 are offered in a
tiny µMAX package. Both the single and dual MAX942
are available in 8-pin DIP and SO packages. The quad
MAX944 comes in 14-pin DIP and narrow SO pack-
ages.
________________________Applications
3V/5V Systems
Battery-Powered Systems
Threshold Detectors/Discriminators
Line Receivers
Zero-Crossing Detectors
Sampling Circuits
____________________________Features
♦Available in µMAX Package
♦Optimized for 3V and 5V Applications
(operation down to 2.7V)
♦Fast, 80ns Propagation Delay (5mV overdrive)
♦Rail-to-Rail Input Voltage Range
♦Low Power:
1mW Power Dissipation per Comparator (3V)
350µA Supply Current
♦Low, 1mV Offset Voltage
♦Internal Hysteresis for Clean Switching
♦Outputs Swing 200mV of Power Rails
♦CMOS/TTL-Compatible Outputs
♦Output Latch (MAX941 only)
♦Shutdown Function (MAX941 only)
______________Ordering Information
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
8
7
6
5
N.C.
OUT
GND
LATCH
SHDN
IN-
IN+
V+
DIP/SO/µMAX
1
2
3
4
8
7
6
5
V+
OUTB
INB-
INB+
GND
INA+
INA-
OUTA
MAX942
DIP/SO/µMAX
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUTD
IND-
IND+
GND
V+
INA+
INA-
OUTA
INC+
INC-
OUTC
OUTB
INB-
INB+
DIP/SO
MAX941
MAX944
TOP VIEW
A
B
AD
BC
__________________________________________________________Pin Configurations
19-0229; Rev 3; 6/97
Ordering Information continued at end of data sheet.
* Dice are specified at TA= +25°C, DC parameters only.
8 SO-40°C to +85°CMAX941ESA 8 Plastic DIP-40°C to +85°CMAX941EPA
8 CERDIP-55°C to +125°CMAX941MJA
Dice*0°C to +70°CMAX941C/D 8 SO0°C to +70°CMAX941CSA 8 Plastic DIP0°C to +70°C
MAX941CPA PIN-PACKAGETEMP. RANGEPART
8 µMAX-40°C to +85°CMAX941EUA
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.
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V+ = 2.7V to 6.0V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C. See Note 14.)
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.
Power-Supply Ranges
Supply Voltage V+ to GND................................................+7V
Differential Input Voltage..........................-0.3V to (V+ + 0.3V)
Common-Mode Input Voltage..................-0.3V to (V+ + 0.3V)
–
L
—
A
—
T
—
C
—
H
–Input (MAX941 only)....................-0.3V to (V+ + 0.3V)
S
—
H
—
D
—
N
–Control Input (MAX941 only).........-0.3V to (V+ + 0.3V)
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
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)..800mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C)......727mW
Operating Temperature Ranges
MAX94_C_ _ .......................................................0°C to +70°C
MAX94_E_ _.....................................................-40°C to +85°C
MAX94_MJ _..................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX94_E/M
MAX94_C
(Note 1)
(Note 6)
ISINK = 4mA
ISINK = 400µA
VIN = VOS, VCM = 0V or V+
VIN = VOS, VCM = 0V or
VCM = V+ (Note 4)
ISOURCE = 4mA
ISOURCE = 400µA
CONDITIONS
µA1ILEAK
Output Leakage Current
V
0.3 0.4
VOL
Output Low Voltage 0.2 0.4
V
V+ - 0.4 V+ - 0.3
VOH
Output High Voltage V+ - 0.4 V+ - 0.2
V-0.2 V+ + 0.2VCMR
V2.7 6.0V+Positive Supply Voltage
Input Voltage Range
nA10 100IOS
Input Offset Current
nA
150 400
IB
Input Bias Current 150 300
UNITSMIN TYP MAXSYMBOLPARAMETER
1 3
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
TA= +25°C
VCM = 0V
or
VCM = V+
(Note 2)
mV
1 4MAX941EUA/MAX942EUA
4
Input-Referred Trip
Points MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
TA= TMIN
to TMAX
VTRIP
mV
6MAX941EUA/MAX942EUA
3
Input Offset Voltage
1 2
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
TA= +25°C
TA= TMIN
to TMAX
VOS
mV
5.5MAX941EUA/MAX942EUA
VCM = 0V
or
VCM = V+
(Note 3)
mV
1 3MAX941EUA/MAX942EUA
µV/V
80 300
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
(Note 5) 80 800
CMRR
Common-Mode Rejection
Ratio MAX941EUA/MAX942EUA
µV/V
80 300
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
2.7V ≤V+ ≤6.0V,
VCM = 0V 80 350
PSRR
Power-Supply Rejection
Ratio MAX941EUA/MAX942EUA
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 2.7V to 6.0V, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C. See Note 14.)
Note 1: Inferred from the CMRR test. Note also that either or both inputs can be driven to the absolute maximum limit (0.3V
beyond either supply rail) without damage or false output inversion.
Note 2: 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 3: VOS is defined as the center of the input-referred hysteresis zone. See Figure 1.
Note 4: The polarity of IBreverses direction as VCM approaches either supply rail. See
Typical Operating Characteristics
for more
detail.
Note 5: Specified over the full common-mode range (VCMR).
Note 6: Applies to the MAX941 only when in shutdown mode. Specification is for current flowing into or out of the output pin for
VOUT driven to any voltage from V+ to GND.
Note 7: Typical power dissipation specified with V+ = 3V; maximum with V+ = 6V.
Note 8: Parameter is guaranteed by design and specified with VOD = 5mV and CLOAD = 15pF in parallel with 400µA of sink or
source current. VOS is added to the overdrive voltage for low values of overdrive. See Figure 2.
Note 9: Specified between any two channels in the MAX942/MAX944.
Note 10: Specified as the difference between tPD+ and tPD- for any one comparator.
Note 11: Applies to the MAX941 only for both –
S
—
H
—
D
—
N
–and –
L
—
A
—
T
—
C
—
H
–pins.
Note 12: Applies to the MAX941 only. Comparator is active with –
L
—
A
—
T
—
C
—
H
–pin driven high and is latched with –
L
—
A
—
T
—
C
—
H
–pin driven low.
See Figure 2.
Note 13: Applicable to the MAX941 only. Comparator is active with –
S
—
H
—
D
—
N
–pin driven high and is in shutdown with –
S
—
H
—
D
—
N
–pin driven
low. Shutdown disable time is the delay when –
S
—
H
—
D
—
N
–is driven high to the time the output is valid.
Note 14: The MAX941EUA and MAX942EUA are 100% production tested at TA= +25°C. Specifications over temperature are
guaranteed by design.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Current per Comparator
380 600
Logic Input Voltage High VIH (Note 11) –
V
–
2
–
+
–+ 0.4 –
V
–
2
–
+
–V
Logic Input Voltage Low VIL (Note 11) –
V
–
2
–
+
– –
V
–
2
–
+
–- 0.4 V
Logic Input Current IIL, IIH VLOGIC = 0V or V+ (Note 11) 2 10 µA
Data-to-Latch Setup Time tS(Note 12) 20 ns
Latch-to-Data Hold Time tH(Note 12) 30 ns
Latch Pulse Width tLPW MAX941 only 50 ns
Latch Propagation Delay tLPD MAX941 only 70 ns
Shutdown Time (Note 13) 3 µs
Shutdown Disable Time (Note 13) 10 µs
Propagation Delay Skew (Note 10) 10 ns
ICC
V+ = 3V 350 500
MAX941 only, shutdown mode (V+ = 3V) 12 60
µA
1.0 4.2
Power Dissipation per
Comparator PD (Note 7) 1.0 3.6 mW
Differential Propagation Delay dtPD (Note 9) 10 ns
MAX941
MAX942/MAX944 430 700MAX941
V+ = 5V 400 600MAX942/MAX944
MAX941
MAX942/MAX944
MAX94_C
MAX94_E/M 80 150
Propagation Delay tPD+,
tPD- (Note 8) 80 200 ns
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
4 _______________________________________________________________________________________
__________________________________________Typical Operating Characteristics
(V+ = 3.0V, TA = +25°C, unless otherwise noted.)
100
40
0 100
PROPAGATION DELAY vs.
INPUT OVERDRIVE
50
90
MAX941-01
INPUT OVERDRIVE (mV)
PROPAGATION DELAY (ns)
75
70
60
25 50
80
30
tPD+
tPD-
RS = 10Ω
CLOAD = 15pF
400
100
10 100k
PROPAGATION DELAY vs.
SOURCE IMPEDANCE
150
350
MAX941-02
SOURCE IMPEDANCE (Ω)
PROPAGATION DELAY (ns)
10k
250
200
100 1k
300
50
tPD+
tPD-
CLOAD = 15pF
VOD = 5mV
180
60 0
PROPAGATION DELAY vs.
CAPACITIVE LOAD
80
160
MAX941-03
CAPACITIVE LOAD (pF)
PROPAGATION DELAY (ns)
400
120
100
100 300 500
140
200
RS = 10Ω
VOD = 5mV
tPD+
tPD-
130
-60 -20 40 80
PROPAGATION DELAY vs.
TEMPERATURE
70
110
MAX941-04
TEMPERATURE (°C)
PROPAGATION DELAY (ns)
0 60
90
120
60
100
80
-40 20 100 120 140
RS = 10Ω
CLOAD = 15pF
VOD = 5mV
01
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
MAX941-07
SINK CURRENT (µA)
VOL (V)
0.1
0.2
0.3
0.4
0.5
10 100 1000 10000
TA = -55°C
TA = +25°C
TA = +125°C
100
40
2 6
PROPAGATION DELAY vs.
SUPPLY VOLTAGE
50
90
MAX941-05
SUPPLY VOLTAGE (V)
PROPAGATION DELAY (ns)
5
70
60
3 4
80
30
tPD+
tPD-
RS = 10Ω
CLOAD = 15pF
VOD = 5mV
2.6
1 10000
OUTPUT HIGH VOLTAGE vs.
SOURCE CURRENT
2.7
MAX941-06
SOURCE CURRENT (µA)
VOH (V)
1000
2.9
2.8
10 100
3.0
2.5
TA = +125°C
TA = +25°C
TA = -55°C
MAX941 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT (µA)
02SUPPLY VOLTAGE (V)
100
200
300
400
500
600
3 4 5 6
MAX941-08
TA = +125°C
TA = +25°C
TA = -55°C
MAX942 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT (µA)
300
SUPPLY VOLTAGE (V)
400
500
600
700
800
MAX941-09
TA = +125°C
TA = +25°C
TA = -55°C
2 3 4 5 6
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
_______________________________________________________________________________________
5
MAX944 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT (mA)
0.75
SUPPLY VOLTAGE (V)
1.00
1.25
1.50
1.75
2.00
MAX941-10
TA = +25°C
TA = -55°C
2 3 4 5 6
TA = +125°C
INPUT VOLTAGE RANGE
vs. TEMPERATURE
INPUT VOLTAGE RANGE (V)
TEMPERATURE (°C)
-1
0
2
3
4
1
-60 140-40 -20 0 20 40 60 80 100 120
MAX941-11
VCM+
V+ = 3.0V
VCM-
SHORT-CIRCUIT OUTPUT CURRENT
vs. TEMPERATURE
SHORT-CIRCUIT OUTPUT CURRENT (mA)
0
10
20
30
40
TEMPERATURE (°C)
MAX941-12
-60 -40 -20 0 20 40 60 80 100 120 140
OUTPUT SHORTED
TO V+ (SINKING)
OUTPUT SHORTED
TO GND (SOURCING)
VOLTAGE TRIP POINTS / INPUT
OFFSET VOLTAGE vs. TEMPERATURE
TRIP POINTS / VOS (µV)
TEMPERATURE (°C)
-2000
-1500
-500
0
1000
-1000
MAX941-13
-60 140-40 -20 0 20 40 60 80 100 120
500 VTRIP+
VTRIP-
VOS
VCM = 0.0V
INPUT BIAS CURRENT
(IB+, IB-) vs. VCM
IB+, IB- (nA)
-100
COMMON-MODE VOLTAGE (V)
MAX941-16
-50
0
50
100
150
200
250
0 1 2 3 4 5 6
TA = -55°C
TA = +25°C
TA = +125°C
VIN+ = VIN-
NEGATIVE VALUES
REPRESENT CURRENT
FLOWING INTO THE
DEVICE
V+ = 6V
INPUT BIAS CURRENT / INPUT OFFSET
CURRENT vs. TEMPERATURE
INPUT BIAS / OFFSET CURRENT (nA)
TEMPERATURE (°C)
0
50
150
200
250
100
MAX941-14
-60 140-40 -20 0 20 40 60 80 100 120
IB+
IB-
IOS
MAX941 SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT (µA)
0
10
20
30
40
TEMPERATURE (°C)
MAX941-17
-60 -40 -20 0 20 40 60 80 100 120 140
V+ = 6.0V
V+ = 2.7V
10MHz RESPONSE
INPUT
50mV/div
OUTPUT
1V/div
VOS
V+
GND
50ns/div
____________________________Typical Operating Characteristics (continued)
(V+ = 3.0V, TA = +25°C, unless otherwise noted.)
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
6 _______________________________________________________________________________________
PROPAGATION DELAY (tPD+)
INPUT STEP = 100mV
VOD = +5mV
INPUT
50mV/div
OUTPUT
1V/div
VOD
VOS
V+
V+
2
GND
20ns/div tPD+
_____________________________Typical Operating Characteristics (continued)
(V+ = 3.0V, TA= +25°C, unless otherwise noted.)
PROPAGATION DELAY (tPD-)
INPUT STEP = 100mV
VOD = -5mV
INPUT
50mV/div
OUTPUT
1V/div
VOD
VOS
V+
V+
2
GND
20ns/div tPD-
NAME FUNCTION
—OUTA Comparator A output
— INA- Comparator A inverting input
______________________________________________________________Pin Description
—INA+ Comparator A noninverting input
1 V+ Positive supply (V+ to GND must be ≤7V)
— OUTC Comparator C output
— OUTB Comparator B output
— INB- Comparator B inverting input
— INB+ Comparator B noninverting input
— IND- Comparator D inverting input
— IND+ Comparator D noninverting input
6 GND Ground
— INC+ Comparator C noninverting input
— INC- Comparator C inverting input
— OUTD Comparator D output
2 IN+ Noninverting input
3 IN- Inverting input
4 S
—
H
—
D
—
N
–Shutdown: MAX941 is active when S
—
H
—
D
—
N
–is driven high; MAX941 is in shutdown
when S
—
H
—
D
—
N
–is driven low.
5 L
—
A
—
T
—
C
—
H
–The output is latched when L
—
A
—
T
—
C
—
H
–is low. The latch is transparent when L
—
A
—
T
—
C
—
H
–
is high.
7 OUT Comparator output
8 N.C. No connect—not internally connected
3
1
2
8
—
7
6
5
—
—
4
—
—
—
—
—
—
—
—
—
3
1
2
4
PIN
8
7
6
5
13
12
11
10
9
14
—
—
—
—
—
—
MAX944MAX942MAX941
_______________Detailed Description
The MAX941/MAX942/MAX944 single-supply compara-
tors feature internal hysteresis, high speed, and low
power. Their outputs are guaranteed to pull within 0.4V
of either supply rail without external pull-up or pull-
down circuitry. Rail-to-rail input voltage range and low-
voltage single-supply operation make these devices
ideal for portable equipment. The MAX941/MAX942/
MAX944 interface directly to CMOS and TTL logic.
Timing
Most high-speed comparators oscillate in the linear
region because of noise or undesired parasitic feed-
back. This tends to occur when the voltage on one
input is at or equal to the voltage on the other input. To
counter the parasitic effects and noise, the MAX941/
MAX942/MAX944 have internal hysteresis.
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’s input
voltages are equal, the hysteresis 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 hys-
teresis to be added with external resistors. The
MAX941/MAX942/MAX944’s fixed internal hysteresis
eliminates these resistors and the equations needed to
determine appropriate values.
Figure 1 illustrates the case where IN- is fixed and IN+
is varied. If the inputs were reversed, the figure would
look the same, except the output would be inverted.
The MAX941 includes an internal latch that allows stor-
age of comparison results. The L
—
A
—
T
—
C
—
H
–pin has a high
input impedance. If L
—
A
—
T
—
C
—
H
–is high, the latch is transpar-
ent (i.e., the comparator operates as though the latch is
not present). The comparator's output state is stored
when L
—
A
—
T
—
C
—
H
–is pulled low. All timing constraints must
be met when using the latch function (Figure 2).
Shutdown Mode (MAX941 Only)
The MAX941 shuts down when –
S
—
H
—
D
—
N
–is low. When shut
down, the supply current drops to less than 60µA, and
the three-state output becomes high impedance. The
–
S
—
H
—
D
—
N
–pin has a high input impedance. Connect
–
S
—
H
—
D
—
N
–to V+ for normal operation. Exit shutdown with
L
—
A
—
T
—
C
—
H
–high; otherwise, the output will be indeterminate.
Input Stage Circuitry
The MAX941/MAX942/MAX944 include internal protec-
tion circuitry that prevents damage to the precision
input stage from large differential input voltages. This
protection circuitry consists of four back-to-back
diodes between IN+ and IN- as well as two 2.5kΩresis-
tors (Figure 3). The diodes limit the differential voltage
applied to the internal circuitry of the comparators to be
no more than 4VF, where VFis the forward voltage drop
of the diode (about 0.7V at +25°C).
For a large differential input voltage (exceeding 4VF),
this protection circuitry increases the input bias current
at IN+ (source) and IN- (sink).
Input Current = (IN+ - IN-) - 4VF
2 x 2.5kΩ
Input current with large differential input voltages
should not be confused with input bias current (IB). As
long as the differential input voltage is less than 4VF,
this input current is equal to IB. The protection circuitry
also allows for the input common-mode range of the
MAX941/MAX942/MAX944 to extend beyond both
power-supply rails. The output is in the correct logic
state if one or both inputs are within the common-mode
range.
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
_______________________________________________________________________________________ 7
VTRIP+
VHYST
VTRIP-
COMPARATOR
OUTPUT
VOH
VOL
VTRIP+ + VTRIP-
2
VOS =
VIN- = 0V
VIN+
Figure 1. Input and Output Waveform, Noninverting Input
Varied
MAX941/MAX942/MAX944
Output Stage Circuitry
The MAX941/MAX942/MAX944 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 static condition. This signifi-
cant decrease in current conserves power after an out-
put 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 will slow down a
voltage output transition. This can be useful in noise-
sensitive applications where fast edges may cause
interference.
__________Applications Information
Circuit Layout and Bypassing
The high gain bandwidth of the MAX941/MAX942/
MAX944 requires design precautions to realize the
comparators’ full high-speed capability. The recom-
mended precautions are:
1) Use a printed circuit board with a good, unbro-
ken, low-inductance ground plane.
2) Place a decoupling capacitor (a 0.1µF ceramic
capacitor is a good choice) as close to V+ as
possible.
3) Pay close attention to the decoupling capacitor’s
bandwidth, keeping leads short.
4) On the inputs and outputs, keep lead lengths
short to avoid unwanted parasitic feedback
around the comparators.
5) Solder the device directly to the printed circuit
board instead of using a socket.
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
8 _______________________________________________________________________________________
VOH
tLPW
OUT
tLPD
tPD
V+
0V
V+
0V
V+
2
V+
2
VOL
LATCH
DIFFERENTIAL
INPUT
VOLTAGE
VOS
tH
tS
Figure 2. MAX941 Timing Diagram with Latch Operator
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
_______________________________________________________________________________________ 9
MAX941
MAX942
MAX944
2.5k
2.5k
TO INTERNAL
CIRCUITRY
TO INTERNAL
CIRCUITRY
IN–
IN+
ISOURCE
ISINK
VCC
0V
OUTPUT
MAX941
MAX942
MAX944
ANALOG IN
VSS
SERIAL
DIGITAL
INPUT
MAX512
VDD
SDI
DACOUTC
VDD = 3.3V
VREFC
8-BIT DAC
GND
MAX941
0V
3V
CLEAN
DIGITAL
SIGNAL
10k
20k
20k
V+ = 3V
COAX LINE
MAX941
Figure 3. Input Stage Circuitry Figure 4. Output Stage Circuitry
Figure 5. 3.3V Digitally Controlled Threshold Detector Figure 6. Line Transceiver Application
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
10 ______________________________________________________________________________________
_Ordering Information (continued)
* Dice are specified at TA= +25°C, DC parameters only.
_________________Chip Topographies
PART TEMP. RANGE PIN-PACKAGE
MAX942CPA 0°C to +70°C 8 Plastic DIP
MAX942CSA 0°C to +70°C 8 SO
MAX942MJA -55°C to +125°C 8 CERDIP
MAX942EPA -40°C to +85°C 8 Plastic DIP
MAX942ESA -40°C to +85°C 8 SO
MAX944CPD 0°C to +70°C 14 Plastic DIP
MAX944CSD 0°C to +70°C 14 SO
MAX944EPD -40°C to +85°C 14 Plastic DIP
MAX944ESD -40°C to +85°C 14 SO
MAX944MJD -55°C to +125°C 14 CERDIP
IN+
0.056"
(1.42mm)
0.058"
(1.47mm)
IN-
SHDN LATCH
GND
OUT
V+
OUTB
0.062"
(1.57mm)
0.064"
(1.63mm)
V+
OUTA
GND
INB- INB+
INA- INA+
MAX941
MAX942
TRANSISTOR COUNT: 134(MAX941), 190(MAX942)
SUBSTRATE CONNECTED TO GND
MAX942C/D 0°C to +70°C Dice*
MAX942EUA -40°C to +85°C 8 µMAX
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
______________________________________________________________________________________ 11
________________________________________________________Package Information
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
___________________________________________Package Information (continued)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12
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