Maxim MAX944CSD High-speed, low-power, 3v/5v, rail-to-rail single-supply comparator Datasheet

19-0229; Rev 3; 6/97
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
____________________________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
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 shortcircuit fault condition to either rail.
Internal hysteresis ensures clean output switching,
even with slow-moving input signals. The MAX941 features latch enable and device shutdown.
♦ 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)
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)
______________Ordering Information
PART
________________________Applications
3V/5V Systems
Battery-Powered Systems
Threshold Detectors/Discriminators
Line Receivers
Zero-Crossing Detectors
TEMP. RANGE
PIN-PACKAGE
MAX941CPA
0°C to +70°C
8 Plastic DIP
MAX941CSA
MAX941C/D
MAX941EPA
MAX941ESA
MAX941EUA
MAX941MJA
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
-55°C to +125°C
8 SO
Dice*
8 Plastic DIP
8 SO
8 µMAX
8 CERDIP
Ordering Information continued at end of data sheet.
* Dice are specified at TA = +25°C, DC parameters only.
Sampling Circuits
__________________________________________________________Pin Configurations
TOP VIEW
MAX941
MAX942
V+
1
8
N.C.
OUTA
1
IN+
2
7
OUT
INA-
2
IN- 3
6
GND
INA+ 3
SHDN 4
5
LATCH
GND 4
DIP/SO/µMAX
OUTA 1
A
B
DIP/SO/µMAX
INA- 2
8
V+
7
OUTB
6
INB-
5
INB+
INA+ 3
14 OUTD
A
V+ 4
D
INB- 6
C
OUTB 7
12 IND+
11 GND
MAX944
INB+ 5
B
13 IND-
10 INC+
9
INC-
8
OUTC
DIP/SO
________________________________________________________________ Maxim Integrated Products
1
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
_______________General Description
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.
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 ................................................+7V
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)
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
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 6.0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. See Note 14.)
PARAMETER
Positive Supply Voltage
Input Voltage Range
Input-Referred Trip
Points
Input Offset Voltage
Input Bias Current
Input Offset Current
Common-Mode Rejection
Ratio
Power-Supply Rejection
Ratio
SYMBOL
V+
VCMR
VTRIP
VOS
IB
IOS
CMRR
PSRR
Output High Voltage
VOH
Output Low Voltage
VOL
Output Leakage Current
2
ILEAK
CONDITIONS
(Note 1)
VCM = 0V
or
VCM = V+
(Note 2)
VCM = 0V
or
VCM = V+
(Note 3)
MIN
2.7
TYP
-0.2
TA = +25°C
TA = TMIN
to TMAX
TA = +25°C
TA = TMIN
to TMAX
VIN = VOS, VCM = 0V or
VCM = V+ (Note 4)
2.7V ≤ V+ ≤ 6.0V,
VCM = 0V
UNITS
V
V+ + 0.2
V
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
1
3
MAX941EUA/MAX942EUA
1
4
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
4
MAX941EUA/MAX942EUA
6
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
1
2
MAX941EUA/MAX942EUA
1
3
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
3
MAX941EUA/MAX942EUA
5.5
MAX94_C
150
300
MAX94_E/M
150
400
10
100
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
80
300
MAX941EUA/MAX942EUA
80
800
MAX94_C_ _, MAX94_EP_,
MAX94_ES_, MAX94_MJ_
80
300
80
350
VIN = VOS, VCM = 0V or V+
(Note 5)
MAX
6.0
MAX941EUA/MAX942EUA
ISOURCE = 400µA
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
1
V
µA
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
(V+ = 2.7V to 6.0V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C. See Note 14.)
PARAMETER
SYMBOL
CONDITIONS
V+ = 3V
Supply Current per Comparator
ICC
V+ = 5V
TYP
MAX
MAX941
MIN
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/M
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
V+
–––– + 0.4
2
mW
ns
Logic Input Voltage High
VIH
(Note 11)
Logic Input Voltage Low
VIL
(Note 11)
V+
––––
2
V+
–––– - 0.4
2
V
VLOGIC = 0V or V+ (Note 11)
2
10
µA
Logic Input Current
IIL, IIH
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
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+ = 6V.
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 MAX941EUA and MAX942EUA 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
80
50
60
100
1k
10k
MAX941-03
MAX941-02
100
10
tPDRS = 10Ω
VOD = 5mV
0
100k
100
300
200
MAX941-04
100
80
tPD+
90
RS = 10Ω
CLOAD = 15pF
VOD = 5mV
3.0
500
400
OUTPUT HIGH VOLTAGE vs.
SOURCE CURRENT
TA = +125°C
TA = +25°C
2.9
80
TA = -55°C
tPD70
VOH (V)
PROPAGATION DELAY (ns)
60
2.8
2.7
50
RS = 10Ω
CLOAD = 15pF
VOD = 5mV
40
2.6
30
2.5
2
20 40 60 80 100 120 140
3
4
5
6
1
10
100
1000
10000
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
MAX941-07
0.5
SUPPLY CURRENT (µA)
0.3
TA = -55°C
TA = +25°C
TA = +125°C
500
0.4
TA = +25°C
400
300
TA = -55°C
200
1000
SINK CURRENT (µA)
10000
500
TA = -55°C
300
0
100
TA = +25°C
600
400
TA = +125°C
10
TA = +125°C
700
100
0
800
SUPPLY CURRENT (µA)
PROPAGATION DELAY (ns)
100
PROPAGATION DELAY vs.
SUPPLY VOLTAGE
90
1
120
PROPAGATION DELAY vs.
TEMPERATURE
-60 -40 -20 0
4
CLOAD = 15pF
VOD = 5mV
140
CAPACITIVE LOAD (pF)
100
0.1
150
100
110
0.2
tPD-
tPD+
SOURCE IMPEDANCE (Ω)
120
60
200
160
INPUT OVERDRIVE (mV)
130
70
250
MAX941-05
0
tPD+
MAX941-08
40
300
MAX941-09
70
180
PROPAGATION DELAY (ns)
tPD+
80
350
PROPAGATION DELAY (ns)
90
PROPAGATION DELAY (ns)
400
MAX941-01
100
PROPAGATION DELAY vs.
CAPACITIVE LOAD
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
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 = 0.0V
20 40 60 80 100 120 140
MAX941-12
OUTPUT SHORTED
TO GND (SOURCING)
10
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
INPUT BIAS CURRENT / INPUT OFFSET
CURRENT vs. TEMPERATURE
INPUT BIAS CURRENT
(IB+, IB-) vs. VCM
250
250
TA = -55°C
200
200
IB+
TA = +25°C
150
150
IB100
TA = +125°C
VIN+ = VINNEGATIVE VALUES
REPRESENT CURRENT
FLOWING INTO THE
DEVICE
100
50
V+ = 6V
0
50
-50
IOS
0
-2000
-100
-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)
MAX941 SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
40
SHUTDOWN SUPPLY CURRENT (µA)
20
TEMPERATURE (°C)
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)
V+ = 6.0V
0
1
2
3
4
5
COMMON-MODE VOLTAGE (V)
6
10MHz RESPONSE
MAX941-17
2
TRIP POINTS / VOS (µV)
40
MAX941-16
1.50
MAX941-11
VCM+
3
INPUT VOLTAGE RANGE (V)
TA = +125°C
V+ = 3.0V
SHORT-CIRCUIT OUTPUT CURRENT (mA)
1.75
SUPPLY CURRENT (mA)
4
MAX941-10
2.00
SHORT-CIRCUIT OUTPUT CURRENT
vs. TEMPERATURE
INPUT VOLTAGE RANGE
vs. TEMPERATURE
MAX944 TOTAL SUPPLY CURRENT
vs. SUPPLY VOLTAGE
30
VOS
20
V+
INPUT
50mV/div
OUTPUT
1V/div
V+ = 2.7V
10
GND
0
-60 -40 -20 0
20 40 60 80 100 120 140
TEMPERATURE (°C)
50ns/div
_______________________________________________________________________________________
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-)
INPUT
50mV/div
VOD
VOS
INPUT
50mV/div
VOS
VOD
V+
V+
OUTPUT
1V/div
V+
2
GND
OUTPUT
1V/div
V+
2
GND
20ns/div
20ns/div
INPUT STEP = 100mV
VOD = +5mV
tPD+
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
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 connect—not internally connected
Positive supply (V+ to GND must be ≤ 7V)
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
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
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 pull-up or pulldown circuitry. Rail-to-rail input voltage range and lowvoltage 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
oscillation occurs. Standard comparators require hysteresis to be added with external resistors. The
MAX941/MAX942/MAX944’s fixed internal hysteresis
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 four back-to-back
diodes between IN+ and IN- as well as two 2.5kΩ resistors (Figure 3). The diodes limit the differential voltage
applied to the internal circuitry of the comparators to be
no more than 4VF, where VF is 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).
(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.
Input Current =
_______________________________________________________________________________________
7
MAX941/MAX942/MAX944
VTRIP+
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 LATCH pin has a high
————–
input impedance. If LATCH 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
VOH
OUT
tPD
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
2.5k
IN+
VCC
MAX941/MAX942/MAX944
MAX941
MAX942
MAX944
MAX941
MAX942
MAX944
ISOURCE
TO INTERNAL
CIRCUITRY
OUTPUT
TO INTERNAL
CIRCUITRY
IN–
2.5k
ISINK
0V
Figure 3. Input Stage Circuitry
Figure 4. Output Stage Circuitry
VDD = 3.3V
V+ = 3V
VREFC
SERIAL
DIGITAL
INPUT
SDI
VDD
10k
8-BIT DAC
MAX512
3V
COAX LINE
20k
MAX941
DACOUTC
GND
VSS
0V
CLEAN
DIGITAL
SIGNAL
MAX941
20k
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
_________________Chip Topographies
MAX941
PIN-PACKAGE
MAX942CPA
0°C to +70°C
8 Plastic DIP
MAX942CSA
MAX942C/D
MAX942EPA
MAX942ESA
MAX942EUA
MAX942MJA
MAX944CPD
MAX944CSD
MAX944EPD
MAX944ESD
MAX944MJD
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
-55°C to +125°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
8 SO
Dice*
8 Plastic DIP
8 SO
8 µMAX
8 CERDIP
14 Plastic DIP
14 SO
14 Plastic DIP
14 SO
14 CERDIP
* Dice are specified at TA = +25°C, DC parameters only.
V+
OUT
IN+
0.056"
(1.42mm)
INGND
LATCH
SHDN
0.058"
(1.47mm)
MAX942
INB-
INB+
OUTB
0.062"
(1.57mm)
V+
GND
OUTA
INA+
0.064"
(1.63mm)
INA-
TRANSISTOR COUNT: 134(MAX941), 190(MAX942)
SUBSTRATE CONNECTED TO GND
10
______________________________________________________________________________________
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
8LUMAXD.EPS
______________________________________________________________________________________
11
MAX941/MAX942/MAX944
________________________________________________________Package Information
___________________________________________Package Information (continued)
PDIPN.EPS
MAX941/MAX942/MAX944
High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators
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 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 1997 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.