19-0229; Rev 9; 3/09
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
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 pullup 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 packages.
____________________________Features
♦
Available in
µMAX
Package
for Automotive Applications
♦
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
♦
CMOS/TTL-Compatible Outputs
♦
Output Latch (MAX941 Only)
♦
Shutdown Function (MAX941 Only)
MAX941/MAX942/MAX944
Ordering Information
PART
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +125°C
PIN-
PACKAGE
8 Plastic DIP
8 SO
8 Plastic DIP
8 SO
8 µMAX
8 µMAX
________________________Applications
3V/5V Systems
Battery-Powered Systems
Threshold Detectors/Discriminators
Line Receivers
Zero-Crossing Detectors
Sampling Circuits
MAX941CPA
MAX941CSA
MAX941EPA
MAX941ESA
MAX941EUA-T
MAX941AUA-T
Ordering Information continued at end of data sheet.
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations
TOP VIEW
MAX941
V+
IN+
1
2
8
7
6
5
N.C.
OUT
GND
LATCH
OUTA
INA-
1
2
MAX942
8
V+
OUTB
INB-
INB+
OUTA
1
INA-
2
INA+
3
V+
4
INB+
5
INB-
6
OUTB
7
14
OUTD
A
D
13
IND-
12
IND+
11
GND
A
B
7
6
5
IN-
3
SHDN
4
INA+
3
GND
4
MAX944
B
C
10
INC+
9
8
INC-
OUTC
DIP/SO/µMAX
DIP/SO/µMAX
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.
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
MAX941/MAX942/MAX944
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 (T
A
= +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, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 14)
PARAMETER
Positive Supply Voltage
Input Voltage Range
SYMBOL
V+
V
CMR
(Note 1)
T
A
= +25°C
Input-Referred Trip
Points
V
TRIP
V
CM
= 0 or
V
CM
= V+
(Note 2)
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
MAX941_UA/MAX942_UA
T
A
= T
MIN
to T
MAX
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
MAX941_UA/MAX942_UA
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
MAX941_UA/MAX942_UA
T
A
= T
MIN
to T
MAX
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
MAX941_UA/MAX942_UA
MAX94_C
MAX94_E/A, MAX942MSA
150
150
10
2.2
80
80
80
80
V+ - 0.4 V+ - 0.2
V+ - 0.4 V+ - 0.3
0.2
0.3
0.4
0.4
1
300
800
300
350
V
V
µA
µV/V
1
1
CONDITIONS
MIN
2.7
-0.2
1
1
TYP
MAX
5.5
V+ + 0.2
3
4
4
6
2
3
3
5.5
300
400
150
nA
nA
V
mV
mV
mV
UNITS
V
V
mV
T
A
= +25°C
Input Offset Voltage
V
OS
V
CM
= 0 or
V
CM
= V+
(Note 3)
Input Bias Current
Input Offset Current
Input Differential Clamp
Voltage
Common-Mode Rejection
Ratio
I
B
I
OS
V
CLAMP
V
IN
= V
OS
, V
CM
= 0 or
V
CM
= V+ (Note 4)
V
IN
= V
OS
, V
CM
= 0 or V+
Force 100µA into IN+, IN- = GND,
measure V
IN+
- V
IN-
, Figure 3
(Note 5)
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
MAX941_UA/MAX942_UA
CMRR
µV/V
Power-Supply Rejection
Ratio
Output High Voltage
Output Low Voltage
Output Leakage Current
2
PSRR
2.7V
≤
V+
≤
5.5V,
V
CM
= 0V
I
SOURCE
= 400µA
I
SOURCE
= 4mA
I
SINK
= 400µA
I
SINK
= 4mA
(Note 6)
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX942MSA
MAX941_UA/MAX942_UA
V
OH
V
OL
I
LEAK
_______________________________________________________________________________________
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 2.7V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 14)
PARAMETER
SYMBOL
V+ = 3V
Supply Current per Comparator
I
CC
V+ = 5V
CONDITIONS
MAX941
MAX942/MAX944
MAX941
MAX942/MAX944
MAX941
MAX942/MAX944
MAX94_C
MAX94_E/A, MAX942MSA
MIN
TYP
380
350
430
400
12
1.0
1.0
80
80
10
10
V
+
––
+ 0.4
––
2
V
+
––
––
2
V
+
––
––
2
V
+
––
- 0.4
––
2
MAX941/MAX942/MAX944
MAX
600
500
700
600
60
4.2
3.6
150
200
UNITS
µA
MAX941 only, shutdown mode (V+ = 3V)
Power Dissipation per
Comparator
Propagation Delay
Differential Propagation Delay
Propagation Delay Skew
Logic Input Voltage High
Logic Input Voltage Low
Logic Input Current
Data-to-Latch Setup Time
Latch-to-Data Hold Time
Latch Pulse Width
Latch Propagation Delay
Shutdown Time
Shutdown Disable Time
Note 1:
Note 2:
V
IH
V
IL
I
IL
, I
IH
t
S
t
H
t
LPW
t
LPD
PD
t
PD+
,
t
PD-
dt
PD
(Note 7)
(Note 8)
(Note 9)
(Note 10)
(Note 11)
(Note 11)
V
LOGIC
= 0 or V+ (Note 11)
(Note 12)
(Note 12)
MAX941 only
MAX941 only
(Note 13)
(Note 13)
mW
ns
ns
ns
V
V
µA
ns
ns
ns
ns
µs
µs
2
20
30
50
70
3
10
10
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).
V
OS
is defined as the center of the input-referred hysteresis zone (see Figure 1).
The polarity of I
B
reverses direction as V
CM
approaches either supply rail. See
Typical Operating Characteristics
for more
detail.
Specified over the full common-mode range (V
CMR
).
Applies to the MAX941 only when in shutdown mode. Specification is for current flowing into or out of the output pin for
V
OUT
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 V
OD
= 5mV and C
LOAD
= 15pF in parallel with 400µA of sink or
source current. V
OS
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 t
PD+
and t
PD-
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 T
A
= +25°C. Specifications over temperature are
guaranteed by design.
_______________________________________________________________________________________
3
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
MAX941/MAX942/MAX944
__________________________________________Typical Operating Characteristics
(V+ = 3.0V, T
A
= +25°C, unless otherwise noted.)
PROPAGATION DELAY vs.
INPUT OVERDRIVE
MAX941-01
PROPAGATION DELAY vs.
SOURCE IMPEDANCE
MAX941-02
PROPAGATION DELAY vs.
CAPACITIVE LOAD
MAX941-03
100
90
PROPAGATION DELAY (ns)
80
70
60
50
40
30
0
25
50
75
R
S
= 10Ω
C
LOAD
= 15pF
t
PD-
t
PD+
400
350
PROPAGATION DELAY (ns)
300
250
200
150
100
50
C
LOAD
= 15pF
V
OD
= 5mV
t
PD-
t
PD+
180
160
140
120
100
80
60
R
S
= 10Ω
V
OD
= 5mV
0
100
200
300
400
PROPAGATION DELAY (ns)
t
PD+
t
PD-
100
10
100
1k
10k
100k
500
INPUT OVERDRIVE (mV)
SOURCE IMPEDANCE (Ω)
CAPACITIVE LOAD (pF)
PROPAGATION DELAY vs.
TEMPERATURE
MAX941-04
PROPAGATION DELAY vs.
SUPPLY VOLTAGE
MAX941-05
OUTPUT HIGH VOLTAGE vs.
SOURCE CURRENT
T
A
= +125°C
T
A
= +25°C
T
A
= -55°C
MAX941-06
130
120
PROPAGATION DELAY (ns)
110
100
90
80
70
60
R
S
= 10Ω
C
LOAD
= 15pF
V
OD
= 5mV
-60 -40 -20 0
100
90
PROPAGATION DELAY (ns)
80
t
PD-
70
60
50
40
30
R
S
= 10Ω
C
LOAD
= 15pF
V
OD
= 5mV
2
3
4
5
6
t
PD+
3.0
2.9
V
OH
(V)
2.8
2.7
2.6
2.5
1
10
100
1000
10,000
SOURCE CURRENT (µA)
20 40 60 80 100 120 140
TEMPERATURE (°C)
SUPPLY VOLTAGE (V)
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
MAX941-07
MAX941 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX941-08
MAX942 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX941-09
0.5
600
500
SUPPLY CURRENT (µA)
400
300
200
100
T
A
= +125°C
800
T
A
= +125°C
T
A
= +25°C
600
0.4
0.3
T
A
= -55°C
T
A
= +25°C
0.1
T
A
= +125°C
1
10
100
1000
10,000
700
T
A
= +25°C
SUPPLY CURRENT (µA)
V
OL
(V)
0.2
T
A
= -55°C
500
T
A
= -55°C
400
0
0
2
3
4
5
SUPPLY VOLTAGE (V)
6
300
2
3
4
5
SUPPLY VOLTAGE (V)
6
SINK CURRENT (µA)
4
_______________________________________________________________________________________
High-Speed, Low-Power, 3V/5V, Rail-to-Rail,
Single-Supply Comparators
MAX941/MAX942/MAX944
____________________________Typical Operating Characteristics (continued)
(V+ = 3.0V, T
A
= +25°C, unless otherwise noted.)
INPUT VOLTAGE RANGE
vs. TEMPERATURE
MAX941-10
MAX944 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
2.00
4
SHORT-CIRCUIT OUTPUT CURRENT
vs. TEMPERATURE
MAX941-11
SHORT-CIRCUIT OUTPUT CURRENT (mA)
V+ = 3.0V
V
CM+
SUPPLY CURRENT (mA)
T
A
= +125°C
INPUT VOLTAGE RANGE (V)
1.75
3
OUTPUT SHORTED
TO V+ (SINKING)
30
1.50
T
A
= +25°C
1.25
2
20
1
1.00
T
A
= -55°C
0.75
2
3
4
5
SUPPLY VOLTAGE (V)
6
0
-1
10
V
CM
-
OUTPUT SHORTED
TO GND (SOURCING)
0
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
VOLTAGE TRIP POINTS/INPUT OFFSET
VOLTAGE vs. TEMPERATURE
MAX941-13
INPUT BIAS CURRENT/INPUT OFFSET
CURRENT vs. TEMPERATURE
MAX941-14
INPUT BIAS CURRENT (I
B
+, I
B
-)
vs. COMMON-MODE VOLTAGE
T
A
= -55°C
T
A
= +25°C
T
A
= +125°C
V
IN
+ = V
IN
-
NEGATIVE VALUES
REPRESENT CURRENT
FLOWING INTO THE
DEVICE
MAX941 TOC15
1000
V
TRIP+
500
TRIP POINTS / V
OS
(µV)
0
-500
V
TRIP-
250
INPUT BIAS / OFFSET CURRENT (nA)
250
200
150
I
B
+, I
B
-
(nA)
100
50
0
200
I
B
+
150
I
B
-
100
V
OS
-1000
-1500
V
CM
= 0
-2000
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
V+ = 6V
50
-50
0
I
OS
-100
-60 -40 -20 0 20 40 60 80 100 120 140
TEMPERATURE (°C)
0
1
2
3
4
5
COMMON-MODE VOLTAGE (V)
6
MAX941 SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT (µA)
MAX941 TOC16
10MHz RESPONSE
40
V+ = 6.0V
30
MAX941 TOC 17
V
OS
INPUT
50mV/div
20
V+ = 2.7V
10
V+
OUTPUT
1V/div
GND
0
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
50ns/div
_______________________________________________________________________________________
MAX941-12
40
5
51单片机
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