Maxim MAX942MSA/PR High-speed, low-power, 3v/5v, rail-to-rail, single-supply comparator Datasheet

19-0229; Rev 9; 3/09
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
____________________________Features
The MAX941/MAX942/MAX944 are single/dual/quad
high-speed comparators optimized for systems powered 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 pullup circuitry, making these devices
ideal for interface with both CMOS and TTL logic. All
input and output pins can tolerate a continuous shortcircuit fault condition to either rail.
♦ Available in µMAX Package
for Automotive Applications
Internal hysteresis ensures clean output switching,
even with slow-moving input signals. The MAX941 features latch enable and device shutdown.
♦ CMOS/TTL-Compatible Outputs
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 packages.
♦ Shutdown Function (MAX941 Only)
♦ Optimized for 3V and 5V Applications
(Operation Down to 2.7V)
♦ Fast, 80ns Propagation Delay (5mV Overdrive)
♦ Rail-to-Rail Input Voltage Range
♦ Low 350µA Supply Current per Comparator
♦ Low, 1mV Offset Voltage
♦ Internal Hysteresis for Clean Switching
♦ Outputs Swing 200mV of Power Rails
♦ Output Latch (MAX941 Only)
Ordering Information
PART
________________________Applications
TEMP RANGE
PINPACKAGE
MAX941CPA
0°C to +70°C
8 Plastic DIP
3V/5V Systems
MAX941CSA
0°C to +70°C
8 SO
Battery-Powered Systems
MAX941EPA
-40°C to +85°C
8 Plastic DIP
Threshold Detectors/Discriminators
MAX941ESA
-40°C to +85°C
8 SO
MAX941EUA-T
-40°C to +85°C
8 µMAX
MAX941AUA-T
-40°C to +125°C
8 µMAX
Line Receivers
Zero-Crossing Detectors
Ordering Information continued at end of data sheet.
Sampling Circuits
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations
TOP VIEW
MAX941
MAX942
OUTA 1
INA- 2
V+
1
8
N.C.
OUTA
1
8
V+
IN+
2
7
OUT
INA-
2
7
OUTB
IN- 3
6
GND
INA+ 3
6
INB-
SHDN 4
5
LATCH
GND 4
5
INB+
DIP/SO/µMAX
A
B
DIP/SO/µMAX
INA+ 3
14 OUTD
A
V+ 4
D
B
C
OUTB 7
12 IND+
11 GND
MAX944
INB+ 5
INB- 6
13 IND-
10 INC+
9
INC-
8
OUTC
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX941/MAX942/MAX944
General Description
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
ABSOLUTE MAXIMUM RATINGS
Power-Supply Ranges
Supply Voltage V+ to GND .............................................+6.5V
Differential Input Voltage ..........................-0.3V to (V+ + 0.3V)
Common-Mode Input Voltage ..................-0.3V to (V+ + 0.3V)
–————–
LATCH Input (MAX941 only) ....................-0.3V to (V+ + 0.3V)
———–
SHDN Control Input (MAX941 only) .........-0.3V to (V+ + 0.3V)
Current Into Input Pins..................................................±20mA
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
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)..800mW
14-Pin SO (derate 8.33mW/°C above +70°C)..............667mW
Operating Temperature Ranges
MAX94_C_ _ .......................................................0°C to +70°C
MAX94_E_ _.....................................................-40°C to +85°C
MAX94_AUA ..................................................-40°C to +125°C
MAX942MSA..................................................-55°C to +125°C
Storage Temperature Range .............................-65°C to +150°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
(V+ = 2.7V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 14)
PARAMETER
Positive Supply Voltage
Input Voltage Range
SYMBOL
CONDITIONS
V+
VCMR
VTRIP
(Note 1)
-0.2
VCM = 0 or
VCM = V+
(Note 2)
TA = TMIN
to TMAX
TA = +25°C
Input Offset Voltage
Input Bias Current
Input Offset Current
Input Differential Clamp
Voltage
Common-Mode Rejection
Ratio
Power-Supply Rejection
Ratio
VOS
IB
IOS
VCLAMP
CMRR
PSRR
Output High Voltage
VOH
Output Low Voltage
VOL
Output Leakage Current
2
ILEAK
TYP
2.7
TA = +25°C
Input-Referred Trip
Points
MIN
VCM = 0 or
VCM = V+
(Note 3)
TA = TMIN
to TMAX
MAX
UNITS
5.5
V
V+ + 0.2
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
1
3
MAX941_UA/MAX942_UA
1
4
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
4
MAX941_UA/MAX942_UA
6
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
1
2
MAX941_UA/MAX942_UA
1
3
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
3
MAX941_UA/MAX942_UA
5.5
MAX94_C
150
300
MAX94_E/A, MAX942MSA
150
400
VIN = VOS, VCM = 0 or V+
10
150
Force 100µA into IN+, IN- = GND,
measure VIN+ - VIN-, Figure 3
2.2
VIN = VOS, VCM = 0 or
VCM = V+ (Note 4)
(Note 5)
2.7V ≤ V+ ≤ 5.5V,
VCM = 0V
80
300
MAX941_UA/MAX942_UA
80
800
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
80
300
MAX941_UA/MAX942_UA
80
350
V+ - 0.4 V+ - 0.2
ISOURCE = 4mA
V+ - 0.4 V+ - 0.3
0.2
0.4
ISINK = 4mA
0.3
0.4
_______________________________________________________________________________________
mV
mV
mV
nA
nA
µV/V
µV/V
V
ISINK = 400µA
(Note 6)
mV
V
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
ISOURCE = 400µA
V
1
V
µA
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
(V+ = 2.7V to 5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (Note 14)
PARAMETER
SYMBOL
CONDITIONS
V+ = 3V
Supply Current per Comparator
ICC
V+ = 5V
MIN
TYP
MAX
MAX941
380
600
MAX942/MAX944
350
500
MAX941
430
700
MAX942/MAX944
400
600
MAX941 only, shutdown mode (V+ = 3V)
Power Dissipation per
Comparator
12
60
MAX941
1.0
4.2
MAX942/MAX944
1.0
3.6
MAX94_C
80
150
MAX94_E/A, MAX942MSA
80
200
UNITS
µA
PD
(Note 7)
Propagation Delay
tPD+,
tPD-
(Note 8)
Differential Propagation Delay
dtPD
(Note 9)
10
ns
(Note 10)
10
ns
V+
––––
2
V
Propagation Delay Skew
Logic Input Voltage High
VIH
(Note 11)
Logic Input Voltage Low
VIL
(Note 11)
Logic Input Current
IIL, IIH
Data-to-Latch Setup Time
Latch-to-Data Hold Time
V+
–––– + 0.4
2
mW
ns
V+
––––
2
V+
–––– - 0.4
2
V
10
µA
VLOGIC = 0 or V+ (Note 11)
2
tS
(Note 12)
20
ns
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
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
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.
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).
VOS is defined as the center of the input-referred hysteresis zone (see Figure 1).
The polarity of IB reverses direction as VCM approaches either supply rail. See Typical Operating Characteristics for more
detail.
Specified over the full common-mode range (VCMR).
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.
Typical power dissipation specified with V+ = 3V; maximum with V+ = 5.5V.
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).
Specified between any two channels in the MAX942/MAX944.
Specified as the difference between tPD+ and tPD- for any one comparator.
–———–
–————–
Applies to the MAX941 only for both SHDN and LATCH pins.
–————–
–————–
Applies to the MAX941 only. Comparator is active with LATCH pin driven high and is latched with LATCH pin driven low
(see Figure 2).
–———–
–———–
Applicable to the MAX941 only. Comparator is active with SHDN pin driven high and is in shutdown with SHDN pin driven
–———–
low. Shutdown disable time is the delay when SHDN is driven high to the time the output is valid.
The MAX941_UA and MAX942_UA are 100% production tested at TA = +25°C. Specifications over temperature are
guaranteed by design.
_______________________________________________________________________________________
3
MAX941/MAX942/MAX944
ELECTRICAL CHARACTERISTICS (continued)
__________________________________________Typical Operating Characteristics
(V+ = 3.0V, TA = +25°C, unless otherwise noted.)
tPD-
60
50
RS = 10Ω
CLOAD = 15pF
30
25
75
50
50
60
100
1k
10k
100k
tPDRS = 10Ω
VOD = 5mV
0
100
300
200
PROPAGATION DELAY vs.
SUPPLY VOLTAGE
OUTPUT HIGH VOLTAGE vs.
SOURCE CURRENT
MAX941-04
100
90
90
80
RS = 10Ω
CLOAD = 15pF
VOD = 5mV
3.0
TA = +125°C
TA = +25°C
2.9
80
tPDVOH (V)
100
tPD+
500
400
PROPAGATION DELAY vs.
TEMPERATURE
-60 -40 -20 0
70
60
TA = -55°C
2.8
2.7
50
2.6
RS = 10Ω
CLOAD = 15pF
VOD = 5mV
40
2.5
30
2
20 40 60 80 100 120 140
3
4
5
1
6
10
100
1000
10,000
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
SOURCE CURRENT (µA)
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
MAX941 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX942 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
600
TA = +125°C
500
SUPPLY CURRENT (µA)
0.4
0.3
TA = -55°C
TA = +25°C
0.1
800
TA = +125°C
700
SUPPLY CURRENT (µA)
MAX941-07
0.5
TA = +25°C
400
300
TA = -55°C
200
TA = +25°C
600
500
TA = -55°C
400
100
TA = +125°C
0
1
10
100
1000
SINK CURRENT (µA)
4
100
CAPACITIVE LOAD (pF)
110
0.2
120
80
10
MAX941-03
MAX941-02
CLOAD = 15pF
VOD = 5mV
140
100
100
PROPAGATION DELAY (ns)
PROPAGATION DELAY (ns)
150
tPD+
SOURCE IMPEDANCE (Ω)
120
60
tPD-
160
INPUT OVERDRIVE (mV)
130
70
200
MAX941-05
0
tPD+
250
MAX941-08
40
300
MAX941-09
70
180
PROPAGATION DELAY (ns)
tPD+
80
350
PROPAGATION DELAY (ns)
PROPAGATION DELAY (ns)
90
PROPAGATION DELAY vs.
CAPACITIVE LOAD
400
MAX941-01
100
PROPAGATION DELAY vs.
SOURCE IMPEDANCE
MAX941-06
PROPAGATION DELAY vs.
INPUT OVERDRIVE
VOL (V)
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
10,000
300
0
2
3
4
5
SUPPLY VOLTAGE (V)
6
2
3
4
5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________
6
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
TA = +25°C
1.25
1.00
2
1
0
VCM-
TA = -55°C
-1
0.75
VOLTAGE TRIP POINTS/INPUT OFFSET
VOLTAGE vs. TEMPERATURE
500
0
VOS
-500
VTRIP-
-1000
-1500
VCM = 0
SHUTDOWN SUPPLY CURRENT (µA)
V+ = 6.0V
MAX941-12
20 40 60 80 100 120 140
INPUT BIAS CURRENT/INPUT OFFSET
CURRENT vs. TEMPERATURE
INPUT BIAS CURRENT (IB+, IB-)
vs. COMMON-MODE VOLTAGE
250
TA = -55°C
200
TA = +25°C
200
I B+
150
150
I B100
TA = +125°C
VIN+ = VINNEGATIVE VALUES
REPRESENT CURRENT
FLOWING INTO THE
DEVICE
100
50
V+ = 6V
0
50
-50
IOS
-100
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
MAX941 SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
40
-60 -40 -20 0
TEMPERATURE (°C)
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
OUTPUT SHORTED
TO GND (SOURCING)
10
TEMPERATURE (°C)
250
-2000
20
20 40 60 80 100 120 140
IB+, IB- (nA)
VTRIP+
INPUT BIAS / OFFSET CURRENT (nA)
MAX941-13
1000
30
0
-60 -40 -20 0
6
MAX941-14
3
4
5
SUPPLY VOLTAGE (V)
OUTPUT SHORTED
TO V+ (SINKING)
0
10MHz RESPONSE
MAX941 TOC16
2
TRIP POINTS / VOS (µV)
MAX941-11
3
MAX941 TOC15
1.50
40
SHORT-CIRCUIT OUTPUT CURRENT (mA)
TA = +125°C
V+ = 3.0V
VCM+
INPUT VOLTAGE RANGE (V)
SUPPLY CURRENT (mA)
4
MAX941-10
2.00
1.75
SHORT-CIRCUIT OUTPUT CURRENT
vs. TEMPERATURE
INPUT VOLTAGE RANGE
vs. TEMPERATURE
MAX944 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
30
VOS
20
V+
1
2
3
4
5
COMMON-MODE VOLTAGE (V)
6
MAX941 TOC 17
INPUT
50mV/div
OUTPUT
1V/div
V+ = 2.7V
10
GND
0
-60 -40 -20 0
20 40 60 80 100 120 140
50ns/div
TEMPERATURE (°C)
_______________________________________________________________________________________
5
MAX941/MAX942/MAX944
____________________________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
_____________________________Typical Operating Characteristics (continued)
(V+ = 3.0V, TA = +25°C, unless otherwise noted.)
PROPAGATION DELAY (tPD+)
PROPAGATION DELAY (tPD-)
MAX941 TOC18
MAX941 TOC19
INPUT
50mV/div
VOD
VOS
V+
OUTPUT
1V/div
V+
2
GND
INPUT
50mV/div
VOS
VOD
V+
OUTPUT
1V/div
V+
2
GND
20ns/div
20ns/div
tPD+
INPUT STEP = 100mV
VOD = +5mV
tPD-
INPUT STEP = 100mV
VOD = -5mV
______________________________________________________________Pin Description
PIN
NAME
6
FUNCTION
MAX941
MAX942
MAX944
—
1
1
OUTA
Comparator A Output
—
2
2
INA-
Comparator A Inverting Input
—
3
3
INA+
Comparator A Noninverting Input
1
8
4
V+
—
5
5
INB+
Comparator B Noninverting Input
—
6
6
INB-
Comparator B Inverting Input
—
7
7
OUTB
Comparator B Output
—
—
8
OUTC
Comparator C Output
—
—
9
INC-
Comparator C Inverting Input
—
—
10
INC+
Comparator C Noninverting Input
Positive Supply (V+ to GND must be ≤ 6.5V)
6
4
11
GND
Ground
—
—
12
IND+
Comparator D Noninverting Input
—
—
13
IND-
Comparator D Inverting Input
—
—
14
OUTD
2
—
—
IN+
Noninverting Input
3
—
—
IN-
Inverting Input
4
—
—
———–
SHDN
———–
Shutdown: MAX941 is active when SHDN is driven high; MAX941 is in shutdown
———–
when SHDN is driven low.
5
—
—
————–
LATCH
————–
————–
The output is latched when LATCH is low. The latch is transparent when LATCH
is high.
7
—
—
OUT
Comparator Output
8
—
—
N.C.
No Connection. Not internally connected.
Comparator D Output
_______________________________________________________________________________________
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
VHYST
VIN+
V
+ VTRIPVOS = TRIP+
2
VIN- = 0V
VTRIP-
VOH
COMPARATOR
OUTPUT
VOL
Figure 1. Input and Output Waveform, Noninverting Input
Varied
_______________Detailed Description
The MAX941/MAX942/MAX944 single-supply comparators feature internal hysteresis, high speed, and low
power. Their outputs are guaranteed to pull within 0.4V
of either supply rail without external pullup or pulldown
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 feedback. 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
Shutdown Mode (MAX941 Only)
–———–
The MAX941 shuts down when SHDN 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
–———–
SHDN to V+ for normal operation. Exit shutdown with
————–
LATCH high; otherwise, the output will be indeterminate.
Input Stage Circuitry
The MAX941/MAX942/MAX944 include internal protection circuitry that prevents damage to the precision
input stage from large differential input voltages. This
protection circuitry consists of two back-to-back diodes
between IN+ and IN- as well as two 4.1kΩ resistors
(Figure 3). The diodes limit the differential voltage
applied to the internal circuitry of the comparators to be
no more than 2VF, where VF is the forward voltage drop
of the diode (about 0.7V at +25°C).
For a large differential input voltage (exceeding 2VF),
this protection circuitry increases the input bias current
at IN+ (source) and IN- (sink).
(IN+ - IN-) - 2VF
Input Current =
2 x 4.1kΩ
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 2VF,
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.
_______________________________________________________________________________________
7
MAX941/MAX942/MAX944
VTRIP+
oscillation occurs. Standard comparators require hysteresis 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 storage 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 transparent (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).
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
tS
tH
V+
VOS
DIFFERENTIAL
INPUT
VOLTAGE
0V
tLPW
V+
LATCH
V+
2
0V
tPD
VOH
OUT
tLPD
V+
2
VOL
Figure 2. MAX941 Timing Diagram with Latch Operator
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 significant 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 will slow down a
voltage output transition. This can be useful in noisesensitive applications where fast edges may cause
interference.
8
__________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 recommended precautions are:
1) Use a printed circuit board with a good, unbroken, 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
4.1kΩ
IN+
VCC
MAX941/MAX942/MAX944
MAX941
MAX942
MAX944
MAX941
MAX942
MAX944
ISOURCE
TO INTERNAL
CIRCUITRY
OUTPUT
TO INTERNAL
CIRCUITRY
IN–
ISINK
4.1kΩ
0
Figure 3. Input Stage Circuitry
Figure 4. Output Stage Circuitry
VDD = 3.3V
V+ = 3V
VREFC
SERIAL
DIGITAL
INPUT
SDI
VDD
10kΩ
8-BIT DAC
3V
COAX LINE
MAX512
20kΩ
MAX941
DACOUTC
GND
VSS
MAX941
0V
CLEAN
DIGITAL
SIGNAL
20kΩ
ANALOG IN
Figure 5. 3.3V Digitally Controlled Threshold Detector
Figure 6. Line Transceiver Application
_______________________________________________________________________________________
9
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
Ordering Information (continued)
PART
TEMP RANGE
MAX942MSA/PR
-55°C to +125°C
PINPACKAGE
PROCESS: BiPOLAR
8 SO
MAX942CPA
0°C to +70°C
MAX942CSA
0°C to +70°C
MAX942EPA
-40°C to +85°C
8 Plastic DIP
MAX942ESA
-40°C to +85°C
8 SO
MAX942EUA-T
-40°C to +85°C
8 µMAX
MAX942AUA-T
-40°C to +125°C
8 µMAX
8 Plastic DIP
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
10
Chip Information
______________________________________________________________________________________
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
8 µMAX
U8-1
21-0036
8 Plastic DIP
P8-1
21-0043
8 SO
S8-2
21-0041
14 Plastic DIP
P14-3
21-0043
14 SO
S14-1
21-0041
α
α
______________________________________________________________________________________
11
MAX941/MAX942/MAX944
Package Information
(For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.)
Package Information (continued)
(For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.)
PDIPN.EPS
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
12
______________________________________________________________________________________
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
N
E
H
INCHES
MILLIMETERS
MAX
MIN
0.053
0.069
0.004
0.010
0.014
0.019
0.010
0.007
0.050 BSC
0.157
0.150
0.228
0.244
0.050
0.016
MAX
MIN
1.75
1.35
0.25
0.10
0.49
0.35
0.19
0.25
1.27 BSC
3.80
4.00
5.80
6.20
0.40
SOICN .EPS
DIM
A
A1
B
C
e
E
H
L
1.27
VARIATIONS:
1
INCHES
TOP VIEW
DIM
D
D
D
MIN
0.189
0.337
0.386
MAX
0.197
0.344
0.394
MILLIMETERS
MIN
4.80
8.55
9.80
MAX
5.00
8.75
10.00
N MS012
8
AA
14
AB
16
AC
D
A
B
e
FRONT VIEW
A1
C
0∞-8∞
L
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL
DOCUMENT CONTROL NO.
21-0041
REV.
B
1
1
______________________________________________________________________________________
13
MAX941/MAX942/MAX944
Package Information (continued)
(For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.)
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
Revision History
REVISION
NUMBER
REVISION
DATE
8
12/08
Added SO package diagram and removed transistor count
10
9
3/09
Corrected Ordering Information for MAX944ESD
10
DESCRIPTION
PAGES
CHANGED
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.
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