Maxim MAX944CPD, MAX944CSD, MAX944EPD, MAX944ESD, MAX944MJD Datasheet

_______________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.

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.

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.

________________________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
INB­INB

+

GND

INA

+

INA-

OUTA

MAX942

DIP/SO/µMAX

14
13
12
11
10

9
8

1
2
3
4
5
6
7

OUTD
IND­IND

+

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 [phone].
For small orders, phone [phone] 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= T

MIN

to T

MAX

, 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 (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

VIN= VOS, VCM= 0V or V+

VIN= VOS, VCM= 0V or
VCM= V+ (Note 4)

I

SOURCE

= 4mA

I

SOURCE

= 400µA

CONDITIONS

µA1I

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+ + 0.2V

CMR

V2.7 6.0V+Positive Supply Voltage

Input Voltage Range

nA10 100I

OS

Input Offset Current

nA

150 400

I

B

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= T

MIN

to T

MAX

V

TRIP

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= T

MIN

to T

MAX

V

OS

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= T

MIN

to T

MAX

, 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: 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 VCMapproaches 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 IIL, I

IHVLOGIC

= 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 700MAX941

V+ = 5V

400 600MAX942/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, 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

t

PD+

t

PD-

RS = 10Ω
C

LOAD

= 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

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

RS = 10Ω
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

RS = 10Ω
C

LOAD

= 15pF

V

OD

= 5mV

0

1

OUTPUT LOW VOLTAGE

vs. SINK CURRENT

MAX941-07

SINK CURRENT (µA)

V

OL

(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

t

PD+

t

PD-

RS = 10Ω
C

LOAD

= 15pF

V

OD

= 5mV

2.6

1 10000

OUTPUT HIGH VOLTAGE vs.

SOURCE CURRENT

2.7

MAX941-06

SOURCE CURRENT (µA)

V

OH

(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)

0

2

SUPPLY 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

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

(µV)

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

VCM = 0.0V

INPUT BIAS CURRENT

(I

B

+, IB-) 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

TA = -55°C

TA = +25°C

TA = +125°C

VIN+ = VIN­NEGATIVE 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+

I

B

-

I

OS

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

V

OS

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 (t

PD+

)

INPUT STEP = 100mV

V

OD

= +5mV

INPUT
50mV/div

OUTPUT
1V/div

V

OD

V

OS

V+

V+

2

GND

20ns/div

t

PD+

_____________________________Typical Operating Characteristics (continued)

(V+ = 3.0V, TA= +25°C, unless otherwise noted.)

PROPAGATION DELAY (t

PD-

)

INPUT STEP = 100mV

V

OD

= -5mV

INPUT
50mV/div

OUTPUT
1V/div

V

OD

V

OS

V+

V+

2

GND

20ns/div

t

PD-

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 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

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).

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 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 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-) - 4V

F

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

V

TRIP+

V

HYST

V

TRIP-

COMPARATOR

OUTPUT

V

OH

V

OL

V

TRIP+

+ V

TRIP-

2

V

OS

=

V

IN-

= 0V

V

IN+

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, I

SOURCE

or I

SINK

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 VOHor VOL, the source or
sink current decreases to a small value, capable of
maintaining the VOHor VOLstatic 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.

__________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

8 _______________________________________________________________________________________

V

OH

t

LPW

OUT

t

LPD

t

PD

V+

0V

V+

0V

V+

2

V+

2

V

OL

LATCH

DIFFERENTIAL

INPUT

VOLTAGE

V

OS

t

H

t

S

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+

Figure 3. Input Stage Circuitry

Figure 4. Output Stage Circuitry

Figure 5. 3.3V Digitally Controlled Threshold Detector Figure 6. Line Transceiver Application

V

CC

I

SOURCE

I

0V

SINK

MAX941
MAX942
MAX944

OUTPUT

SERIAL

DIGITAL

INPUT

SDI

VREFC

8-BIT DAC

MAX512

GND

ANALOG IN

V

DD

DACOUTC

V

SS

V

DD

= 3.3V

MAX941

V+ = 3V

10k

COAX LINE

20k

20k

MAX941

3V
0V

CLEAN
DIGITAL
SIGNAL

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

8LUMAXD.EPS

MAX941/MAX942/MAX944

High-Speed, Low-Power, 3V/5V,
Rail-to-Rail Single-Supply Comparators

___________________________________________Package Information (continued)

PDIPN.EPS

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.