MAX9077 [MAXIM]
Low-Cost, Ultra-Small, 3レA Single-Supply Comparators; 低成本，超小型， 3μA ，单电源比较器
| 型号： | MAX9077 |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Low-Cost, Ultra-Small, 3レA Single-Supply Comparators |
| 文件： | 总8页 (文件大小：111K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1547; Rev 0; 10/99
Lo w -Co s t , Ult ra -S m a ll, 3 µA
S in g le -S u p p ly Co m p a ra t o rs
5/MAX907
Ge n e ra l De s c rip t io n
Fe a t u re s
The MAX9075/MAX9077 single/dual comparators are
optimized for +3V and +5V single-supply applications.
These comparators have a 580ns propagation delay and
consume just 3µA per comparator. The combination of
low-power, single-supply operation down to +2.1V, and
ultra-small footprint makes these devices ideal for all
portable applications.
♦ 580ns Propagation Delay from Only 3µA
♦ +2.1V to +5.5V Single-Supply Operation
♦ Ground-Sensing Inputs
♦ Rail-to-Rail Outputs
♦ No Output Phase Inversion for Overdriven Inputs
♦ No Differential Clamp Across Inputs
The MAX9075/MAX9077 have a common-mode input
voltage range of -0.2V to V - 1.2V. Unlike many com-
CC
parators, there is no differential clamp between the
inputs, allowing the differential input voltage range to
extend Rail-to-Rail . All inputs and outputs tolerate a
♦ Available in Ultra-Small Packages
5-Pin SC70 (MAX9075)
®
8-Pin SOT23 (MAX9077)
continuous short-circuit fault condition to either rail.
The design of the output stage limits supply-current
surges while switching (typical of many other compara-
tors), minimizing power consumption under dynamic
conditions. Large internal push-pull output drivers allow
rail-to-rail output swing with loads up to 2mA, making
these devices ideal for interface with TTL/CMOS logic.
Ord e rin g In fo rm a t io n
PIN-
TOP
The MAX9075 single comparator is available in 5-pin
SC70 and SOT23-5 packages, while the MAX9077 dual
c omp a ra tor is a va ila b le in 8-p in SOT23-8 a nd SO
packages.
PART
TEMP. RANGE
PACKAGE MARK
MAX9075EXK-T
MAX9075EUK-T
MAX9077EKA-T
MAX9077ESA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
5 SC70-5
5 SOT23-5
8 SOT23-8
8 SO
AAC
ADLX
AAAD
—
Ap p lic a t io n s
Battery-Powered Systems
Threshold Detectors/Discriminators
Keyless Entry Systems
IR Receivers
Typ ic a l Op e ra t in g Circ u it
Digital Line Receivers
V
CC
P in Co n fig u ra t io n s
TOP VIEW
V
IN
V
CC
MAX9075
MAX9077
OUT
GND
IN+
1
2
3
5
V
CC
IN+
IN-
MAX9075
OUT
4
IN-
V
REF
GND
SC70-5/SOT23-5
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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 1-800-835-8769.
Lo w -Co s t , Ult ra -S m a ll, 3 µA
S in g le -S u p p ly Co m p a ra t o rs
ABSOLUTE MAXIMUM RATINGS
Supply Voltage
5-Pin SOT23 (derate 7.1mW/°C above +70°C)..........571mW
8-Pin SOT23 (derate 5.3mW/°C above +70°C)..........421mW
8-Pin SO (derate 5.88mW/°C above +70°C)..............471mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
V
CC
to GND .....................................................................+6V
All Other Pins to GND...........................-0.3V to (V + 0.3V)
CC
Duration of Output Short Circuit to GND or V ........Continuous
Continuous Power Dissipation (T = +70°C)
CC
A
5-Pin SC70 (derate 2.5mW/°C above +70°C)............200mW
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 = +5V, V = -0.2V, T = T
to T , unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
MAX A
CC
CM
A
MIN
PARAMETER
SYMBOL
CONDITIONS
Inferred from PSRR
MIN
TYP
MAX
5.5
UNITS
Operating Supply Voltage Range
V
CC
2.1
V
T
= +25°C
3
5.2
A
V
= 5V
CC
5/MAX907
Supply Current per Comparator
I
CC
T
A
= T
to T
MAX
6.6
µA
MIN
V
= 3V
2.4
77
CC
Power-Supply Rejection Ratio
Common-Mode Voltage Range
PSRR
2.1V ≤ V ≤ 5.5V
54
dB
V
CC
V
1.2
-
CC
V
CMR
(Note 2)
-0.2
Input Offset Voltage
Input Offset Current
Input Bias Current
V
±1
1
±8
mV
nA
nA
pF
OS
I
OS
I
V
= 0 (Note 3)
-5
3
-20
0.4
B
CM
Input Capacitance
C
IN
Common-Mode Rejection Ratio
CMRR
-0.2V ≤ V ≤ (V - 1.2V)
60
82
dB
CM
CC
V
-
CC
OUT_ Output Voltage High
V
OH
I
= 2mA
V
SOURCE
0.4
OUT_ Output Voltage Low
Propagation Delay Low to High
Propagation Delay High to Low
Rise/Fall Time
V
OL
I
= 2mA
V
ns
ns
ns
SINK
t
C
C
C
= 10pF, overdrive = 100mV
= 10pF, overdrive = 100mV
= 10pF
580
250
1.6
PD+
LOAD
LOAD
LOAD
t
PD-
Note 1: All devices are 100% production tested at T = +25°C. All temperature limits are guaranteed by design.
A
Note 2: Inferred from CMRR. Either input can be driven to the absolute maximum limit without output inversion, as long as the other
input is within the input voltage range.
Note 3: Guaranteed by design.
2
_______________________________________________________________________________________
Lo w -Co s t , Ult ra -S m a ll, 3 µA
S in g le -S u p p ly Co m p a ra t o rs
5/MAX907
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = +5V, V = 0, 100mV overdrive, T = +25°C, unless otherwise noted.)
CC
CM
A
OUTPUT VOLTAGE LOW vs.
OUTPUT VOLTAGE LOW vs.
OUTPUT VOLTAGE LOW vs.
SINK CURRENT (V = 3V)
CC
SINK CURRENT (V = 5V)
CC
SINK CURRENT (V = 2.1V)
CC
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
7
6
5
4
3
2
3.0
2.5
2.0
1.5
1.0
0.5
T = +25°C
T = +25°C
A
A
T = +25°C
A
T = +85°C
T = +85°C
T = +85°C
A
A
A
T = -40°C
A
T = -40°C
A
T = -40°C
A
1
0
0
0
5
10 15 20 25 30 35 40
SINK CURRENT (mA)
0
10 20 30 40 50 60 70 80 90
SINK CURRENT (mA)
0
5
10
15
20
SINK CURRENT (mA)
OUTPUT VOLTAGE HIGH vs.
SOURCE CURRENT (V = 3V)
CC
OUTPUT VOLTAGE HIGH vs.
SOURCE CURRENT (V = 2.1V)
OUTPUT VOLTAGE HIGH vs.
SOURCE CURRENT (V = 5V)
CC
CC
3.5
3.0
2.5
2.0
2.5
2.0
1.5
1.0
0.5
0
6
5
4
T = -40°C
A
T = -40°C
A
T = -40°C
A
T = +85°C
A
3
2
1
T = +85°C
A
T = +85°C
A
1.5
1.0
T = +25°C
A
T = +25°C
A
T = +25°C
A
0.5
0
0
-0.5
-1
-0.5
0
5
10 15 20 25 30 35 40 45
SOURCE CURRENT (mA)
0
10 20 30 40 50 60 70 80 90 100
SOURCE CURRENT (mA)
0
2
4
6
8
10 12 14 16 18
SOURCE CURRENT (mA)
SHORT-CIRCUIT SOURCE CURRENT
vs. TEMPERATURE
SHORT-CIRCUIT SINK CURRENT
vs. TEMPERATURE
SUPPLY CURRENT vs.
TEMPERATURE (OUT = HIGH)
100
90
80
70
60
50
40
30
20
10
0
90
80
4.5
4.0
V
= 5V
CC
70
60
50
40
30
20
10
0
V
= 5V
CC
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= 5V
CC
V
= 3V
CC
V
= 2.1V
CC
V
= 3V
V
CC
= 3V
CC
V
= 2.1V
CC
V = 2.1V
CC
-55 -35 -15
5
25
45
65
85
-55 -35 -15
5
25
45
65
85
-55 -35 -15
5
25
45
65
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
_______________________________________________________________________________________
3
Lo w -Co s t , Ult ra -S m a ll, 3 µA
S in g le -S u p p ly Co m p a ra t o rs
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +5V, V = 0, 100mV overdrive, T = +25°C, unless otherwise noted.)
CC
CM
A
SUPPLY CURRENT vs.
TEMPERATURE (OUT = LOW)
SUPPLY CURRENT vs.
OUTPUT TRANSITION FREQUENCY
INPUT OFFSET VOLTAGE
vs. TEMPERATURE
4.0
1000
100
10
0
-0.1
-0.2
-0.3
-0.4
-0.5
-0.6
3.5
3.0
2.5
2.0
1.5
1.0
V
= 5V
CC
V
= 5V
CC
V
CC
= 3V
V
CC
= 2.1V
V
CC
= 3V
V = 5V
CC
V
CC
= 3V
V
= 2.1V
CC
0.5
0
-0.7
-0.8
V
CC
= 2.1V
1
-55 -35 -15
5
25
45
65
85
1
10
100
1k
10k 100k 1M
-55 -35 -15
5
25
45
65
85
5/MAX907
TEMPERATURE (°C)
TRANSITION FREQUENCY (Hz)
TEMPERATURE (°C)
PROPAGATION DELAY
vs. LOAD CAPACITANCE
PROPAGATION DELAY
PROPAGATION DELAY
vs. INPUT OVERDRIVE (t
)
vs. INPUT OVERDRIVE (t
)
PD-
PD+
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
t
PD+
V
= 2.1V
t
CC
PD-
V
CC
= 5V
V
= 3V
CC
V
CC
= 3V
V
= 5V
CC
V
CC
= 2.1V
0.2
0
0
50
100
150
200
250
0
50
100
150
200
250
0
500
1000
1500
2000
LOAD CAPACITANCE (pF)
INPUT OVERDRIVE (mV)
INPUT OVERDRIVE (mV)
PROPAGATION DELAY
vs. TEMPERATURE (V = 2.1V)
CC
PROPAGATION DELAY
vs. TEMPERATURE (V = 3V)
PROPAGATION DELAY
vs. TEMPERATURE (V = 5V)
CC
CC
600
500
400
300
200
100
0
500
450
400
350
800
700
600
500
t
PD+
t
PD+
t
PD+
t
300
250
200
150
100
50
PD-
400
300
200
t
PD-
t
PD-
100
0
0
-55 -35 -15
5
25
45
65
85
-55 -35 -15
5
25
45
65
85
-55 -35 -15
5
25
45
65
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Lo w -Co s t , Ult ra -S m a ll, 3 µA
S in g le -S u p p ly Co m p a ra t o rs
5/MAX907
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s (c o n t in u e d )
(V = +5V, V = 0, 100mV overdrive, T = +25°C, unless otherwise noted.)
CC
CM
A
PROPAGATION DELAY (t
)
PROPAGATION DELAY (t
)
PD-
PD+
MAX9075/7 toc20
MAX9075/7 toc19
V
CC
= 5V
V
CC
= 5V
V
IN
50mV/div
2V/div
V
IN
50mV/div
2V/div
V
OUT
V
OUT
100ns/div
100ns//div
PROPAGATION DELAY (t
)
PROPAGATION DELAY (t
)
PD-
PD+
MAX9075/7 toc22
MAX9075/7 toc23
V
CC
= 3V
V
CC
= 3V
V
IN
V
IN
50mV/div
1V/div
50mV/div
1V/div
V
OUT
V
OUT
100ns/div
100ns/div
INPUT BIAS CURRENT
vs. TEMPERATURE
TRIANGLE WAVE
MAX9075/7 toc21
7
6
V
= 3V
CC
V
= 5V
CC
5
4
3
2
1
0
V
CC
= 3V
50mV/div
1V/div
V
IN
V
CC
= 2.1V
V
OUT
-55 -35 -15
5
25
45
65
85
200µs/div
TEMPERATURE (°C)
_______________________________________________________________________________________
5
Lo w -Co s t , Ult ra -S m a ll, 3 µA
S in g le -S u p p ly Co m p a ra t o rs
P in De s c rip t io n
PIN
MAX9075
MAX9077
NAME
FUNCTION
SOT23-5
SC70-5
SO
SOT23-8
1
—
2
1
—
2
—
1
—
1
OUT
OUTA
GND
IN+
Comparator Output
Output of Comparator A
Ground
4
2
3
3
—
3
—
4
Noninverting Comparator Input
—
4
—
4
INA+
IN-
Noninverting Input of Comparator A
Inverting Comparator Input
—
2
—
3
—
5
—
5
INA-
Inverting Input of Comparator A
Positive Supply Voltage
8
8
V
CC
5/MAX907
—
—
—
—
—
—
5
5
INB+
INB-
Noninverting Input of Comparator B
Inverting Input of Comparator B
Output of Comparator B
6
6
7
7
OUTB
De t a ile d De s c rip t io n
Ap p lic a t io n s In fo rm a t io n
The MAX9075/MAX9077 feature a 580ns propagation
delay from an ultra-low supply current of only 3µA per
comparator. These devices are capable of single-sup-
ply operation in the +2.1V to +5.5V range. Large inter-
nal output drivers allow rail-to-rail output swing with up
to 2mA loads. Both comparators offer a push-pull out-
put that sinks and sources current.
Ad d in g Hys t e re s is
Hysteresis extends the comparator’s noise margin by
increasing the upper threshold and decreasing the
lower threshold. A voltage divider from the output of the
comparator sets the trip voltage. Therefore, the trip
voltage is related to the output voltage. Set the hystere-
sis with three resistors using positive feedback, as
shown in Figure 1.
Co m p a ra t o r Ou t p u t
The MAX9075/MAX9077 are designed to maintain a
low supply current during repeated transitions by limit-
ing the shoot-through current.
The design procedure is as follows:
1) Choose R3. The leakage current of IN+ may cause a
small error; however, the current through R3 can be
approximately 500nA and still maintain accuracy.
The added supply current due to the circuit at the
No is e Co n s id e ra t io n s , Co m p a ra t o r In p u t
The inp ut c ommon-mod e volta g e ra ng e for the s e
trip point is V /R3; 10MΩ is a good practical value
CC
devices extends from -0.2V to V - 1.2V. Unlike many
CC
for R3, as this keeps the current well below the sup-
ply current of the chip.
other comparators, the MAX9075/MAX9077 can oper-
ate at any differential input voltage within these limits.
Input bias current is typically -5nA if the input voltage is
between the supply rails.
2) Choose the hysteresis voltage (V
), which is the
HYS
voltage between the upper and lower thresholds. In
this example, choose V = 50mV and assume
HYS
Although the comparators have a very high gain, useful
gain is limited by noise. The comparator has a wide-
band peak-to-peak noise of approximately 70µV.
V
REF
= 1.2V and V = 5V.
CC
3) Calculate R1 as follows:
R1 = R3 · V / V = 10MΩ · 0.05 / 5 = 100kΩ
HYS
CC
6
_______________________________________________________________________________________
Lo w -Co s t , Ult ra -S m a ll, 3 µA
S in g le -S u p p ly Co m p a ra t o rs
5/MAX907
4) Choose the threshold voltage for V rising (V
). In
THR
IN
this example, choose V
= 3V.
THR
V
CC
5) Calculate R2 as follows:
R3
R2 = 1 / {[V / (V
1 / {[3 / (1.2 · 100k)] - 1/100k - 1/10M} = 67.114kΩ
· R1)] - 1/R1 - 1/R3} =
REF
THR
R1
V
IN
V
CC
OUT
A 1% preferred value is 64.9kΩ.
R2
GND
6) Verify the threshold voltages with these formulas:
MAX9075
MAX9077
V
IN
rising:
V
REF
V
THR
= V
· R1 (1/R1 + 1/R2 + 1/R3)
REF
V
IN
falling:
V
THF
= V
- (R1 · V ) / R3
Figure 1. Adding Hysteresis
THR CC
7) Check the error due to input bias current (5nA). If the
error is too large, reduce R3 and recalculate.
P in Co n fig u ra t io n s (c o n t .)
V
= I (R1 · R2 · R3) / (R1 + R2 + R3) = 0.2mV
B
TH
Bo a rd La yo u t a n d Byp a s s in g
TOP VIEW
Use 10nF power-supply bypass capacitors. Use 100nF
bypass capacitors when supply impedance is high,
when supply leads are long, or when excessive noise is
expected on the supply lines. Minimize signal trace
le ng ths to re d uc e s tra y c a p a c ita nc e . Minimize the
capacitive coupling between IN- and OUT. For slow-
moving inp ut s ig na ls (ris e time > 1ms ) us e a 1nF
capacitor between IN+ and IN-.
OUTA
GND
1
2
8
7
V
CC
OUTB
MAX9077
INA-
3
4
6
5
INB-
INA+
INB+
Ch ip In fo rm a t io n
TRANSISTOR COUNT: 86 (MAX9075)
142 (MAX9077)
SOT23-8
OUTA
INA-
1
2
3
4
8
7
6
5
V
CC
OUTB
INB-
MAX9077
INA+
GND
INB+
SO
_______________________________________________________________________________________
7
Lo w -Co s t , Ult ra -S m a ll, 3 µA
S in g le -S u p p ly Co m p a ra t o rs
P a c k a g e In fo rm a t io n
5/MAX907
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.
8
_____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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