_______________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
o
Available in µMAX Package
o
Optimized for 3V and 5V Applications
(operation down to 2.7V)
o
Fast, 80ns Propagation Delay (5mV overdrive)
o
Rail-to-Rail Input Voltage Range
o
Low Power:
1mW Power Dissipation per Comparator (3V)
350µA Supply Current
o
Low, 1mV Offset Voltage
o
Internal Hysteresis for Clean Switching
o
Outputs Swing 200mV of Power Rails
o
CMOS/TTL-Compatible Outputs
o
Output Latch (MAX941 only)
o
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/
µ
MAX
1
2
3
4
8
7
6
5
V+
OUTB
INB-
INB+
GND
INA+
INA-
OUTA
MAX942
DIP/SO/
µ
MAX
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
A
D
B
C
__________________________________________________________Pin Configurations
19-0229; Rev 3; 6/97
Ordering Information continued at end of data sheet.
* Dice are specified at T
A
= +25°C, DC parameters only.
8 SO
-40°C to +85°C
MAX941ESA
8 Plastic DIP
-40°C to +85°C
MAX941EPA
8 CERDIP
-55°C to +125°C
MAX941MJA
Dice*
0°C to +70°C
MAX941C/D
8 SO
0°C to +70°C
MAX941CSA
8 Plastic DIP
0°C to +70°C
MAX941
CPA
PIN-PACKAGE
TEMP. RANGE
PART
8 µMAX
-40°C to +85°C
MAX941EUA
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, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +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 (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
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)
I
SINK
= 4mA
I
SINK
= 400µA
V
IN
= V
OS
, V
CM
= 0V or V+
V
IN
= V
OS
, V
CM
= 0V or
V
CM
= V+ (Note 4)
I
SOURCE
= 4mA
I
SOURCE
= 400µA
CONDITIONS
µA
1
I
LEAK
Output Leakage Current
V
0.3
0.4
V
OL
Output Low Voltage
0.2
0.4
V
V+ - 0.4 V+ - 0.3
V
OH
Output High Voltage
V+ - 0.4 V+ - 0.2
V
-0.2
V+ + 0.2
V
CMR
V
2.7
6.0
V+
Positive Supply Voltage
Input Voltage Range
nA
10
100
I
OS
Input Offset Current
nA
150
400
I
B
Input Bias Current
150
300
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
1
3
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
T
A
= +25°C
V
CM
= 0V
or
V
CM
= V+
(Note 2)
mV
1
4
MAX941EUA/MAX942EUA
4
Input-Referred Trip
Points
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
T
A
= T
MIN
to T
MAX
V
TRIP
mV
6
MAX941EUA/MAX942EUA
3
Input Offset Voltage
1
2
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
T
A
= +25°C
T
A
= T
MIN
to T
MAX
V
OS
mV
5.5
MAX941EUA/MAX942EUA
V
CM
= 0V
or
V
CM
= V+
(Note 3)
mV
1
3
MAX941EUA/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,
V
CM
= 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, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +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:
V
OS
is defined as the center of the input-referred hysteresis zone. See Figure 1.
Note 4:
The polarity of I
B
reverses direction as V
CM
approaches either supply rail. See
Typical Operating Characteristics for more
detail.
Note 5:
Specified over the full common-mode range (V
CMR
).
Note 6:
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.
Note 7:
Typical power dissipation specified with V+ = 3V; maximum with V+ = 6V.
Note 8:
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.
Note 9:
Specified between any two channels in the MAX942/MAX944.
Note 10:
Specified as the difference between t
PD+
and t
PD-
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 T
A
= +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
V
IH
(Note 11)
V
2
+
+ 0.4
V
2
+
V
Logic Input Voltage Low
V
IL
(Note 11)
V
2
+
V
2
+
- 0.4
V
Logic Input Current
I
IL
, I
IH
V
LOGIC
= 0V or V+ (Note 11)
2
10
µA
Data-to-Latch Setup Time
t
S
(Note 12)
20
ns
Latch-to-Data Hold Time
t
H
(Note 12)
30
ns
Latch Pulse Width
t
LPW
MAX941 only
50
ns
Latch Propagation Delay
t
LPD
MAX941 only
70
ns
Shutdown Time
(Note 13)
3
µs
Shutdown Disable Time
(Note 13)
10
µs
Propagation Delay Skew
(Note 10)
10
ns
I
CC
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
dt
PD
(Note 9)
10
ns
MAX941
MAX942/MAX944
430
700
MAX941
V+ = 5V
400
600
MAX942/MAX944
MAX941
MAX942/MAX944
MAX94_C
MAX94_E/M
80
150
Propagation Delay
t
PD+
,
t
PD-
(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, T
A
= +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
t
PD+
t
PD-
R
S
= 10
C
LOAD
= 15pF
400
100
10
100k
PROPAGATION DELAY vs.
SOURCE IMPEDANCE
150
350
MAX941-02
SOURCE IMPEDANCE (
)
PROPAGATION DELAY (ns)
10k
250
200
100
1k
300
50
t
PD+
t
PD-
C
LOAD
= 15pF
V
OD
= 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
R
S
= 10
V
OD
= 5mV
t
PD+
t
PD-
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
R
S
= 10
C
LOAD
= 15pF
V
OD
= 5mV
0
1
OUTPUT LOW VOLTAGE
vs. SINK CURRENT
MAX941-07
SINK CURRENT (
µ
A)
V
OL
(V)
0.1
0.2
0.3
0.4
0.5
10
100
1000
10000
T
A
= -55°C
T
A
= +25°C
T
A
= +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
t
PD+
t
PD-
R
S
= 10
C
LOAD
= 15pF
V
OD
= 5mV
2.6
1
10000
OUTPUT HIGH VOLTAGE vs.
SOURCE CURRENT
2.7
MAX941-06
SOURCE CURRENT (
µ
A)
V
OH
(V)
1000
2.9
2.8
10
100
3.0
2.5
T
A
= +125°C
T
A
= +25°C
T
A
= -55°C
MAX941 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT (
µ
A)
0
2
SUPPLY VOLTAGE (V)
100
200
300
400
500
600
3
4
5
6
MAX941-08
T
A
= +125°C
T
A
= +25°C
T
A
= -55°C
MAX942 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
SUPPLY CURRENT (
µ
A)
300
SUPPLY VOLTAGE (V)
400
500
600
700
800
MAX941-09
T
A
= +125°C
T
A
= +25°C
T
A
= -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
T
A
= +25°C
T
A
= -55°C
2
3
4
5
6
T
A
= +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
V
CM+
V+ = 3.0V
V
CM
-
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 / V
OS
(
µ
V)
TEMPERATURE (°C)
-2000
-1500
-500
0
1000
-1000
MAX941-13
-60
140
-40 -20 0
20 40 60 80 100 120
500
V
TRIP+
V
TRIP-
V
OS
V
CM
= 0.0V
INPUT BIAS CURRENT
(I
B
+, I
B
-) vs. V
CM
I
B
+, I
B
-
(nA)
-100
COMMON-MODE VOLTAGE (V)
MAX941-16
-50
0
50
100
150
200
250
0
1
2
3
4
5
6
T
A
= -55°C
T
A
= +25°C
T
A
= +125°C
V
IN
+ = V
IN
-
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
I
B
+
I
B
-
I
OS
MAX941 SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SHUTDOWN SUPPLY CURRENT (
µ
A)
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
V
OS
V+
GND
50ns/div
____________________________Typical Operating Characteristics (continued)
(V+ = 3.0V, T
A
= +25°C, unless otherwise noted.)
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