MAX971CUA-T [ROCHESTER]
COMPARATOR, 10000uV OFFSET-MAX, 300000ns RESPONSE TIME, PDSO8, MICRO, SOP-8;
| 型号： | MAX971CUA-T |
| 厂家： | 
Rochester Electronics |
| 描述： | COMPARATOR, 10000uV OFFSET-MAX, 300000ns RESPONSE TIME, PDSO8, MICRO, SOP-8 放大器 光电二极管 |
| 文件： | 总18页 (文件大小：981K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0450; Rev 3; 2/03
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
General Description
Features
The MAX971–MAX974 and MAX981–MAX984 single/
dual/quad low-voltage comparators feature the lowest
power consumption available. These micropower
devices draw less than 4µA supply current over
temperature (MAX971/MAX972/MAX981/MAX982), and
include an internal 1.182V 1ꢀ (MAX971/MAX97ꢁ/
MAX974) or 2ꢀ (MAX981–MAX984) voltage reference
and programmable hysteresis.
ꢀ Available in Ultra-Small Packages:
UCSP™ (MAX972)
µMAX (MAX9_1/MAX9_2/MAX9_3)
ꢀ Ultra-Low Quiescent Current (4µA, max)
Over Extended Temp Range (MAX971/MAX981)
ꢀ Power Supplies:
Single 2.5V to 11V
Dual 1.25V to 5.5V
Ideal for ꢁV or 5V single-supply applications, these
devices operate from a single 2.5V to 11V supply (or
1.25V to 5.5V dual supplies), and each comparatorꢂs
input voltage ranges from the negative supply rail to within
1.ꢁV of the positive supply.
ꢀ Input Voltage Range Includes Negative Supply
ꢀ Internal Bandgap Reference
1.182V 1% (MAX97_)
1.182V 2% (MAX98_)
The single MAX971/MAX981 and the dual MAX97ꢁ/
MAX982/MAX98ꢁ provide a unique, simple method for
adding hysteresis without feedback or complicated
equations, simply by using the HYST pin plus two
resistors.
ꢀ 12µs Propagation Delay (10mV Overdrive)
ꢀ Output Has Separate GND Pin (MAX9_1/MAX9_4)
Applications
Battery-Powered
Systems
Window Comparators
Level Translators
The MAX971–MAX974 and MAX981–MAX984ꢂs open-
drain outputs permit wire-ORed configurations. Thanks to
an 11V output range and separate GND pin for the output
transistor (MAX971/MAX974, MAX981/MAX984), these
devices are ideal for level translators and bipolar to single-
ended converters. For similar devices with complementary
output stages, see the MAX921–MAX924 (1ꢀ reference)
and the MAX9ꢁ1–MAX9ꢁ4 (2ꢀ reference).
Threshold Detectors
Oscillator Circuits
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
8 Plastic Dip
8 SO
MAX971CPA
MAX971CSA
MAX971CUA
0°C to +70°C
0°C to +70°C
0°C to +70°C
8 µMAX
Ordering Information continued at end of data sheet.
Typical Operating Circuit
V
IN
8-Pin
DIP/SO/µMAX
MAX971
MAX972
MAX97ꢁ
MAX974
MAX981
MAX982
MAX98ꢁ
MAX984
1ꢀ
None
1ꢀ
1
2
2
4
1
2
2
4
Yes
No
7
V+
8-Pin UCSP/
DIP/SO/µMAX
3
IN+
8-Pin
DIP/SO/µMAX
OUT 8
Yes
No
4 IN-
1ꢀ
16-Pin DIP/SO
HYST
5
8-Pin
DIP/SO/µMAX
2ꢀ
Yes
Yes
Yes
No
MAX971
MAX981
6 REF
8-Pin
DIP/SO/µMAX
2ꢀ
GND
1
V-
2
8-Pin
DIP/SO/µMAX
2ꢀ
THRESHOLD DETECTOR
UCSP is a trademark of Maxim Integrated Products, Inc.
2ꢀ
16-Pin DIP/SO
________________________________________________________________________________________
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
ABSOLUTE MAXIMUM RATINGS
V+ to V-, V+ to GND, GND to V-................................-0.3V, +12V
Inputs
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
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW
16-Pin SO (derate 8.70mW/°C above +70°C) ................696mW
Operating Temperature Ranges
MAX97_C_ _/MAX98_C_ _..................................0°C to +70°C
MAX97_E_ _/MAX98_E_ _ ...............................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Bump Temperature (soldering)
Current: IN_+, IN_-, HYST..............................................20mA
Voltage: IN_+, IN_-, HYST ...............(V+ + 0.3V) to (V- - 0.3V)
Outputs
Current: REF...................................................................20mA
OUT_................................................................50mA
Voltage: REF....................................(V+ + 0.3V) to (V- - 0.3V)
OUT_ (MAX9_1/9_4)..................12V to (GND - 0.3V)
(MAX9_2/9_3).......................12V to (V- - 0.3V)
OUT_ Short-Circuit Duration ..................................Continuous
Continuous Power Dissipation (T = +70°C)
Reflow ..........................................................................+235°C
A
8-Bump UCSP (derate 4.7mW/°C above +70°C) ........379mW
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—5V OPERATION
(V+ = 5V, V- = GND = 0V, T = T
A
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
MAX
MIN
PARAMETER
POWER REQUIREMENTS
Supply Voltage Range
Output Voltage Range
CONDITIONS
MIN
TYP
MAX
UNITS
(Note 2)
2.5
0
11
11
3.2
4
V
V
T
= +25°C
2.5
2.5
A
MAX9_1,
HYST = REF
C/E temp ranges
= +25°C
T
A
3.2
4
MAX972
C/E temp ranges
= +25°C
IN+ = IN- +
100mV
Supply Current
µA
MAX982/
MAX9_3,
HYST = REF
T
A
3.1
5.5
4.5
6
C/E temp ranges
= +25°C
T
A
6.5
8.5
MAX9_4
C/E temp ranges
COMPARATOR
Input Offset Voltage
V
= 2.5V
10
5
mV
nA
nA
CM
Input Leakage Current (IN-, IN+)
Input Leakage Current (HYST)
IN+ = IN- = 2.5V
C/E temp ranges
0.01
0.02
MAX9_1/MAX982/MAX9_3
Input Common-Mode Voltage
Range
V-
V+ - 1.3
V
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Voltage Noise
V- to (V+ - 1.3V)
0.1
0.1
20
1.0
1.0
mV/V
mV/V
V+ = 2.5V to 11V
100Hz to 100kHz
µV
RMS
V
Hysteresis Input Voltage Range
MAX9_1/MAX982/MAX9_3
REF - 0.05
REF
Overdrive = 10mV
Overdrive = 100mV
12
4
Response Time (High-to-Low
Transition)
T = +25°C, 100pF load,
A
1MΩ pullup to V+
µs
µs
Response Time (Low-to-High
Transition) (Note 3)
T
= +25°C, 100pF load, 1MΩ pullup to V+
300
A
2
_______________________________________________________________________________________
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
ELECTRICAL CHARACTERISTICS—5V OPERATION (continued)
(V+ = 5V, V- = GND = 0V, T = T
A
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
MAX
MIN
PARAMETER
Output Low Voltage
CONDITIONS
MIN
TYP
MAX
UNITS
V
MAX9_2/MAX9_3, I
= 1.8mA
V- + 0.4
OUT
GND
+ 0.4
MAX9_1/MAX9_4, I
= 1.8mA
OUT
Output Leakage Current
V
= 11V
100
nA
OUT
REFERENCE (MAX9_1/MAX982/MAX9_3/MAX9_4 ONLY)
C temp range
E temp range
C temp range
E temp range
1%
2%
2%
3%
1.170
1.158
1.158
1.147
15
1.182
1.182
25
1.194
1.206
1.206
1.217
MAX971/MAX973/
MAX974
Reference Voltage
V
MAX981–MAX984
T
A
= +25°C
Source Current
µA
µA
C/E temp ranges
= +25°C
6
T
A
8
15
Sink Current
C/E temp ranges
100Hz to 100kHz
4
Voltage Noise
100
µV
RMS
ELECTRICAL CHARACTERISTICS—3V OPERATION
(V+ = 3V, V- = GND = 0V, T = T
A
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
MAX
MIN
PARAMETER
CONDITIONS
MIN
TYP
2.4
2.4
3.4
5.2
MAX
UNITS
POWER REQUIREMENTS
T
= +25°C
3.0
3.8
3.0
3.8
4.3
5.8
6.2
8.0
A
MAX9_1
MAX972
C/E temp ranges
= +25°C
T
A
HYST = REF,
IN+ = (IN- +
100mV)
C/E temp ranges
= +25°C
Supply Current
µA
T
A
MAX982/
MAX9_3
C/E temp ranges
= +25°C
T
A
MAX9_4
C/E temp ranges
COMPARATOR
Input Offset Voltage
V
= 1.5V
10
5
mV
nA
nA
CM
Input Leakage Current (IN-, IN+)
Input Leakage Current (HYST)
IN+ = IN- = 1.5V
C/E temp ranges
0.01
0.02
MAX9_1/MAX982/MAX9_3
Input Common-Mode Voltage
Range
V-
V+ - 1.3
V
Common-Mode Rejection Ratio
Power-Supply Rejection Ratio
Voltage Noise
V- to (V+ - 1.3V)
0.2
0.1
20
1
1
mV/V
mV/V
V+ = 2.5V to 11V
100Hz to 100kHz
µV
RMS
V
Hysteresis Input Voltage Range
MAX9_1/MAX982/MAX9_3
REF - 0.05
REF
_______________________________________________________________________________________
3
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
ELECTRICAL CHARACTERISTICS—3V OPERATION (continued)
(V+ = 3V, V- = GND = 0V, T = T
A
to T
, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A
MAX
MIN
PARAMETER
CONDITIONS
Overdrive = 10mV
Overdrive = 100mV
= +25°C, 100pF load, 1MΩ pullup to V+
MIN
TYP
12
4
MAX
UNITS
Response Time (High-to-Low
Transition)
T = +25°C, 100pF load,
A
1MΩ pullup to V+
µs
Response Time (Low-to-High
Transition) (Note 3)
T
300
µs
A
MAX9_2/MAX9_3, I
MAX9_1/MAX9_4, I
= 0.8mA
V- + 0.4
GND + 0.4
100
OUT
OUT
Output Low Voltage
V
= 0.8mA
Output Leakage Current
V
= 11V
nA
OUT
REFERENCE
C temp range
E temp range
C temp range
E temp range
1%
2%
2%
3%
1.170
1.158
1.158
1.147
15
1.182
1.182
25
1.194
1.206
1.206
1.217
MAX971/MAX973/
MAX974
Reference Voltage
Source Current
V
MAX981–MAX984
T
= +25°C
A
µA
µA
C/E temp ranges
= +25°C
6
T
8
15
A
Sink Current
C/E temp ranges
100Hz to 100kHz
4
Voltage Noise
100
µV
RMS
Note 1: The MAX972EBL is 100% tested at T = +25°C. Temperature limits are guaranteed by design.
A
Note 2: MAX974/MAX984 comparators work below 2.5V; see Low-Voltage Operation section for more details.
Note 3: Low-to-high response time is the result of the 1MΩ pullup and the 100pF capacitive load, based on three time constants.
A faster response time is achieved with a smaller RC.
4
_______________________________________________________________________________________
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
__________________________________________Typical Operating Characteristics
(V+ = 5V, V- = GND = 0V, T = +25°C, unless otherwise noted.)
A
REFERENCE OUTPUT VOLTAGE vs.
OUTPUT VOLTAGE LOW
vs. LOAD CURRENT
MAX971/MAX973/MAX974
REFERENCE VOLTAGE vs. TEMPERATURE
OUTPUT LOAD CURRENT
1.190
2.5
2.0
1.22
1.21
1.20
1.19
1.18
V+ = 5V
SINK
1.185
1.180
EXTENDED TEMP RANGE
SOURCE
V+ = 3V
COMMERCIAL
TEMP RANGE
1.5
1.0
1.175
1.170
1.165
1.160
1.155
1.17
1.16
1.15
1.14
V+ = 5V
0.5
0
OR
V+ = 3V
0
5
10
15
20
25
30
0
4
8
12
16
20
-60 -40 -20
0
20 40 60 80 100 120 140
OUTPUT LOAD CURRENT (µA)
LOAD CURRENT (mA)
TEMPERATURE (°C)
MAX9_1
SUPPLY CURRENT vs.
TEMPERATURE
MAX972
MAX982/MAX9_3
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
4.5
4.0
4.5
4.0
5.0
IN+ = (IN- + 100mV)
IN+ = IN- + 100mV
V+ = 5V, V- = - 5V
4.5
4.0
3.5
3.0
2.5
2.0
1.5
3.5
3.0
V+ = 5V, V- = 0V
V+ = 10V, V- = 0V
3.5
3.0
2.5
2.0
V+ = 3V, V- = 0V
V+ = 5V, V- = 0V
V+ = 3V, V- = 0V
2.5
2.0
V+ = 3V, V- = 0V
V+ = 5V, V- = 0V
-60
-20
20
60
100
140
-60
-20
20
60
100
140
-60
-20
20
60
100
140
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX9_4
SUPPLY CURRENT vs.
LOW SUPPLY VOLTAGES
MAX9_4
MAX9_1/MAX982/MAX9_3
HYSTERESIS CONTROL
SUPPLY CURRENT vs. TEMPERATURE
10
9
80
10
IN+ = (IN- + 100mV)
60
40
20
OUTPUT HIGH
8
1
7
V+ = 5V, V- = -5V
0
-20
-40
-60
NO CHANGE
6
0.1
V+ = 5V, V- = 0V
V+ = 3V, V- = 0V
5
OUTPUT LOW
4
3
-80
0.01
-60
-20
20
60
100
140
0
10
V
20
- V
30
(mV)
40
50
1.0
1.5
2.0
2.5
TEMPERATURE (°C)
SINGLE-SUPPLY VOLTAGE (V)
REF
HYST
_______________________________________________________________________________________
5
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
Typical Operating Characteristics (continued)
(V+ = 5V, V- = GND = 0V, T = +25°C, unless otherwise noted.)
A
MAX9_1/MAX972/MAX9_4
TRANSFER FUNCTION
RESPONSE TIME vs.
LOAD CAPACITANCE
RESPONSE TIME FOR VARIOUS
INPUT OVERDRIVES (V
)
OHL
5.0
4.5
18
16
+5V
V- = 0V
10kΩ
5
4
3
2
100kΩ
V
0
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
14
12
10µF
10mV
V
OHL
100mV
20mV
10
8
1
0
50mV
100
0
6
4
2
-0.3
-0.1
0.1
0.2
0.3
-0.2
0
0
20
40
60
80
100
-2
2
6
10
14
18
IN+ INPUT VOLTAGE (mV)
LOAD CAPACITANCE (nF)
RESPONSE TIME (µs)
MAX9_4
SINK CURRENT
AT LOW SUPPLY VOLTAGES
RESPONSE TIME
AT LOW SUPPLY VOLTAGES (V
SHORT-CIRCUIT SINK CURRENT
vs. SUPPLY VOLTAGE
)
OHL
1000
100
25
20
15
R
= 10kΩ
PULLUP
OUT CONNECTED TO V+
GND CONNECTED TO V-
100
10
10
1
10
5
-20mV
-100mV
SINK CURRENT AT V
1.5
= 0.4V
2.0
OUT
1
0.1
0
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4
SINGLE-SUPPLY VOLTAGE (V)
1.0
2.5
0
5
10
SINGLE-SUPPLY VOLTAGE (V)
TOTAL SUPPLY VOLTAGE (V)
6
_______________________________________________________________________________________
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
Pin Description
PIN
MAX971/
MAX981
MAX973/
MAX983
MAX972
MAX982
NAME
FUNCTION
DIP/SO/
µMAX
DIP/SO/
µMAX
DIP/SO/
µMAX
DIP/SO/
µMAX
UCSP
Ground. Connect to V- for single-supply operation.
1
2
—
—
—
—
GND
V-
Negative Supply. Connect to GND for single-supply
operation (MAX9_1).
2
C2
2
2
3
4
—
—
—
—
—
—
—
—
IN+
IN-
Noninverting Comparator Input
Inverting Comparator Input
Hysteresis Input. Connect to REF if not used. Input
5
—
—
5
5
HYST
voltage range is from V
to (V
- 50mV).
REF
REF
6
—
—
6
6
REF
Reference Output. 1.182V with respect to V-.
7
8
7
A2
7
7
V+
Positive Supply
—
—
—
—
OUT
Comparator Output. Sinks current to GND.
—
1
A1
1
1
OUTA
Comparator A Open-Drain Output. Sinks current to V-.
—
—
—
—
3
4
5
6
C1
B1
B3
C3
3
—
—
4
3
—
4
INA+
INA-
INB-
INB+
Noninverting Input of Comparator A
Inverting Input of Comparator A
Inverting Input of Comparator B
Noninverting Input of Comparator B
—
—
8
A3
8
8
OUTB
Comparator B Open-Drain Output. Sinks current to V-.
_______________________________________________________________________________________
7
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
Pin Description (continued)
PIN
NAME
FUNCTION
MAX974
MAX984
1
2
OUTB
OUTA
V+
Comparator B Open-Drain Output. Sinks current to GND.
Comparator A Open-Drain Output. Sinks current to GND.
Positive Supply
3
4
INA-
INA+
INB-
INB+
REF
Inverting Input of Comparator A
5
Noninverting Input of Comparator A
6
Inverting Input of Comparator B
7
Noninverting Input of Comparator B
8
Reference Output. 1.182V with respect to V-.
Negative Supply. Connect to ground for single-supply operation.
Inverting Input of Comparator C
9
V-
10
11
12
13
14
15
16
INC-
INC+
IND-
IND+
GND
OUTD
OUTC
Noninverting Input of Comparator C
Inverting Input of Comparator D
Noninverting Input of Comparator D
Ground. Connect to V- for single-supply operation.
Comparator D Open-Drain Output. Sinks current to GND.
Comparator C Open-Drain Output. Sinks current to GND.
8
_______________________________________________________________________________________
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
Power-Supply and Input Signal Ranges
Detailed Description
This family of devices operates from a single 2.5V to 11V
power supply. The MAX9_1 and MAX9_4 have a
separate ground for the output driver, allowing operation
with dual supplies ranging from 1.25V to 5.5V.
Connect V- to GND when operating the MAX9_1 or
MAX9_4 from a single supply. The maximum total supply
voltage in this case is still 11V.
The MAX971–MAX974/MAX981–MAX984 comprise
various combinations of a micropower 1.182V reference
and micropower comparators. The Typical Operating
Circuit shows the MAX971/MAX981 configuration, and
Figures 1a–1d show the MAX9_2–MAX9_4 configurations.
Internal hysteresis in the MAX9_1, MAX982, and
MAX9_3 provides the easiest method for implementing
hysteresis. It also produces faster hysteresis action and
consumes much less current than circuits using external
positive feedback.
For proper comparator operation, the input signal can
range from the negative supply (V-) to within one volt of
the positive supply (V+ - 1V). The guaranteed common-
mode input voltage range extends from V- to (V+ -
1.3V). The inputs can be taken above and below the
supply rails by up to 300mV without damage.
MAX9_3
1
OUTA
OUTB
8
MAX972
1 (A1) OUTA
OUTB 8 (A3)
2
3
4
V-
V+
REF
7
6
5
2 (C2) V-
V+ 7 (A2)
INB+ 6 (C3)
INB- 5 (B3)
INA+
INB-
3 (C1) INA+
4 (B1) INA-
HYST
V-
Figure 1c. MAX973/MAX983 Functional Diagram
(Window Comparator)
( ) BUMPS FOR THE UCSP
Figure 1a. MAX972 Functional Diagram
MAX9_4
OUTB
OUTA
OUTC 16
OUTD 15
1
2
3 V+
GND 14
IND+ 13
IND- 12
INA-
4
MAX982
1
OUTA
OUTB
8
5 INA+
2
3
4
V-
V+
REF
7
6
5
INA+
INB+
6 INB-
7 INB+
8 REF
INC+ 11
INC- 10
HYST
V-
V-
9
Figure 1d. MAX974/MAX984 Functional Diagram
Figure 1b. MAX982 Functional Diagram
_______________________________________________________________________________________
9
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
The negative supply does not affect the output sink
current. The positive supply provides gate drive for the
output N-channel MOSFET and heavily influences the
output current capability, especially at low supply
voltages (see Typical Operating Characteristics section).
THRESHOLDS
IN+
The MAX9_2 and MAX9_3 have no GND pin, and their
outputs sink current to V-.
HYSTERESIS
BAND
IN-
V
- V
V
HB
REF
HYST
Voltage Reference
The internal bandgap voltage reference has an output
of 1.182V above V-. Note that the REF voltage is
referenced to V-, not to GND. Its accuracy is 1%
(MAX971/MAX973/MAX974) or 2% (MAX981–MAX984)
in the 0°C to +70°C range. The REF output is typically
capable of sourcing 25µA and sinking 15µA. Do not
bypass the REF output.
OUT
Noise Considerations
Although the comparators have a very high gain, useful
gain is limited by noise. This is shown in the Transfer
Function graph (see Typical Operating Characteristics).
As the input voltage approaches the comparatorꢂs
offset, the output begins to bounce back and forth; this
peaks when VIN = VOS. (The lowpass filter shown on the
graph averages out the bouncing, making the transfer
function easy to observe.) Consequently, the
comparator has an effective wideband peak-to-peak
noise of around 300µV. The voltage reference has
peak-to-peak noise approaching 1mV. Thus, when a
comparator is used with the reference, the combined
peak-to-peak noise is about 1mV. This, of course, is
much higher than the RMS noise of the individual
components. Take care in your layout to avoid
capacitive coupling from any output to the reference
pin. Crosstalk can significantly increase the actual
noise of the reference.
Figure 2. Threshold Hysteresis Band
Low-Voltage Operation: V+ = 1V
(MAX9_4 Only)
The guaranteed minimum operating voltage is 2.5V (or
1.25V). As the total supply voltage falls below 2.5V,
performance degrades and the supply current falls. The
reference will not function below about 2.2V, although
the comparators will continue to operate with a total
supply voltage as low as 1V. While the MAX9_4 has
comparators that may be used at supply voltages below
2V, the MAX9_1/MAX9_2/MAX9_3 may not be used with
supply voltages below 2.5V.
At low supply voltages, the comparatorsꢂ output sink
capability is reduced and the propagation delay
increases (see Typical Operating Characteristics). The
useful input voltage range extends from the negative
supply to a little under 1V below the positive supply,
which is slightly closer to the positive rail than when the
device operates from higher supply voltages. Test your
prototype over the full temperature and supply-voltage
range if you anticipate operation below 2.5V.
2.5V TO 11V
7
I
6
5
REF
V+
Comparator Output
With 100mV of overdrive, propagation delay is typically
3µs. The Typical Operating Characteristics show the
propagation delay for various overdrive levels. The
open-drain outputs are intended for wire-ORed and
level-shifting applications. The maximum output voltage
is 11V above V-, and may be applied even when no
supply voltage is present (V+ = V-).
REF
MAX9_1
MAX982
MAX9_3
R1
R2
HYST
V-
2
The MAX9_1 and MAX9_4 outputs sink current to GND,
making these devices ideal for bipolar to single-ended
conversion and level-shifting applications.
Figure 3. Programming the HYST Pin
10 ______________________________________________________________________________________
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
__________Applications Information
V+
Hysteresis
Hysteresis increases the comparatorsꢂ noise margin by
increasing the upper threshold and decreasing the
lower threshold (Figure 2).
R
H
R
PULLUP
V
IN
Hysteresis (MAX9_1/MAX982/MAX9_3)
To add hysteresis to the MAX9_1, MAX982, or MAX9_3,
connect resistor R1 between REF and HYST, and
connect resistor R2 between HYST and V- (Figure 3). If
no hysteresis is required, connect HYST to REF. When
hysteresis is added, the upper threshold increases by
the same amount that the lower threshold decreases.
The hysteresis band (the difference between the upper
and lower thresholds, VHB) is approximately equal to
twice the voltage between REF and HYST. The HYST
input can be adjusted to a maximum voltage of REF
and to a minimum voltage of (REF - 50mV). The
maximum difference between REF and HYST (50mV)
will therefore produce a 100mV (max) hysteresis band.
Use the following equations to determine R1 and R2:
V+ OUT
V-
MAX9_4
GND
V
REF
Figure 4. External Hysteresis
Board Layout and Bypassing
Power-supply bypass capacitors are not needed if the
supply impedance is low, but 100nF bypass capacitors
should be used when the supply impedance is high or
when the supply leads are long. Minimize signal lead
lengths to reduce stray capacitance between the input
and output that might cause instability. Do not bypass
the reference output.
V
HB
R1 =
2 × I
(
)
REF
V
HB
2
1.182 –
R2 =
I
REF
Window Detector
The MAX9_3 is ideal for making window detectors
(undervoltage/overvoltage detectors). The schematic is
shown in Figure 5, with component values selected for a
4.5V undervoltage threshold and a 5.5V overvoltage
threshold. Choose different thresholds by changing the
values of R1, R2, and R3. To prevent chatter at the
output when the supply voltage is close to a threshold,
hysteresis has been added using R4 and R5. Taken
alone, OUTA would provide an active-low undervoltage
indication, and OUTB would give an active-low
overvoltage indication. Wired-ORing the two outputs
provides an active-high, power-good signal.
where IREF (the current sourced by the reference)
should not exceed the REF source capability, and
should be significantly larger than the HYST input
current. IREF values between 0.1µA and 4µA are usually
appropriate. If 2.4MΩ is chosen for R2 (IREF = 0.5µA),
the equation for R1 and VHB can be approximated as:
R1 (kΩ) = V (mV)
HB
When hysteresis is obtained in this manner for the
MAX982/MAX9_3, the same hysteresis applies to both
comparators.
Hysteresis (MAX972/MAX9_4)
Hysteresis can be implemented with any comparator
using positive feedback, as shown in Figure 4. This
approach generally draws more current than circuits
using the HYST pin on the MAX9_1/MAX982/MAX9_3,
and the high feedback impedance slows hysteresis. In
addition, because the output does not source current,
any increase in the upper threshold is dependent on
the load or pullup resistor on the output.
The design procedure is as follows:
1) Choose the required hysteresis level and calculate
values for R4 and R5 according to the formulas in
the Hysteresis (MAX9_1/MAX982/MAX9_3) section.
In this example, 5mV of hysteresis has been added
at the comparator input (VH = VHB/2). This means
that the hysteresis apparent at VIN will be larger
because of the input resistor divider.
______________________________________________________________________________________ 11
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
2) Select R1. The leakage current into INB- is normally
under 1nA, so the current through R1 should exceed
100nA for the thresholds to be accurate. R1 values
V
= 5.5V
= 4.5V
up to about 10MΩ can be used, but values in the
V
IN
OTH
5V
V
UTH
100kΩ to 1MΩ range are usually easier to deal with.
In this example, choose R1 = 294kΩ.
3) Calculate R2 + R3. The overvoltage threshold
should be 5.5V when VIN is rising. The design
equation is as follows:
R3
1MΩ
7
V+
1MΩ
3
INA+
OUTA
1
8
VOTH
+ VH
5
6
HYST
REF
R2 + R3 = R1 ×
− 1
V
REF
R2
R5
62.2kΩ
10kΩ
5.5
= 294kΩ ×
− 1
R4
2.4MΩ
(1.182 + 0.005)
OUTB
= 1.068MΩ
4
INB-
2
POWER GOOD
4) Calculate R2. The undervoltage threshold should be
4.5V when VIN is falling. The design equation is as
follows:
R1
294kΩ
MAX9_3
V-
(V
− V )
H
REF
V
R2 = (R1 + R2 + R3) ×
− R1
UTH
(1.182 − 0.005)
= (294kΩ + 1.068MΩ) ×
4.5
Figure 5. Window Detector
− 294kΩ
= 62.2kΩ
Battery Switchover Circuit
The switchover from line-powered DC to a backup
battery is often accomplished with diodes. But this
simple method is sometimes unacceptable, due to the
voltage drop and associated power loss across the
diode in series with the battery. Figure 6ꢂs circuit
replaces the diode with a P-channel MOSFET
controlled by one of the MAX9_3 comparator outputs.
Choose R2 = 61.9kΩ (1% standard value).
5) Calculate R3:
R3 = (R2 + R3) − R2
= 1.068MΩ − 61.9kΩ
= 1.006MΩ
When the DC wall adapter drops below 4V (determined
by R1 and R2), OUTA goes low, turning on Q1.
Comparator B is used to measure the battery voltage,
and gives a “low-battery” indication when the battery
drops below 3.6V.
Choose R3 = 1MΩ (1% standard value)
6) Verify the resistor values. The equations are as
follows, evaluated for the above example:
Overvoltage Threshold:
(R1 + R2 + R3)
V
= (V
+ V ) ×
Level-Shifter
Figure 7 shows a circuit to shift from bipolar 5V inputs
to single-ended 5V outputs. The 10kΩ resistors protect
the comparator inputs, and do not materially affect the
circuitꢂs operation.
OTH
REF
H
R1
= 5.474V
Undervoltage Threshold:
(R1 + R2 + R3)
V
= (V
− V ) ×
UTH
REF H
(R1 + R2)
= 4.484V
R5
R4
where the hysteresis voltage V = V
×
REF
.
H
12 ______________________________________________________________________________________
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
5V
3.3V
3
WALL
ADAPTER
V+
9V DC
MAX974
MAX984
STEP-DOWN
REGULATOR
10kΩ
10kΩ
5
INA+
3.3V
LOGIC
SUPPLY
V
INA
Q1
OUTA
2
1
4
7
INA-
INB+
1MΩ
7
V+
V
V
INB
BATTERY
(4 CELLS)
OUTB
MAX973
MAX983
10kΩ
6
INB-
953kΩ
470kΩ
4
INB-
10kΩ
10kΩ
OUTB
8
11 INC+
INC
IND
LOW BATT
OUTC 16
1
3
OUTA
INA+
10 INC-
13 IND+
R1
110kΩ
DC OK
V
OUTD 15
REF
6
5
20kΩ
12 IND-
8
R2
47kΩ
REF
N.C.
HYST
V-
2
2.4MΩ
V-
9
GND
14
-5V
Figure 7. Level Shifter: 5V Input to Single-Ended 3.3V Output
Figure 6. Battery Switchover Circuit
UCSP Applications Information
For the latest application details on UCSP contruction,
dimensions, tape carrier information, printed circuit
board techniques, bump-pad layout and
recommended reflow temperature profile as well as the
latest information on reliability testing results, go to
Maximꢂs web site at www.maxim-ic.com/ucsp to find
the Application Note: UCSP–A Wafer-Level Chip-Scale
Package.
______________________________________________________________________________________ 13
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
Pin Configurations
TOP VIEW
GND
8
OUTA
8
OUTA
8
1
2
3
4
1
2
3
4
1
2
3
4
OUT
V+
OUTB
V+
OUTB
V+
V-
IN+
IN-
7
6
5
V-
INA+
INA-
7
6
5
V-
INA+
INB+
7
6
5
MAX971
MAX981
MAX972
MAX982
REF
HYST
INB+
INB-
REF
HYST
DIP/SO/µMAX
DIP/SO/µMAX
DIP/SO/µMAX
TOP VIEW
(BUMPS ON BOTTOM)
1
2
3
OUTB
OUTA
V+
1
2
3
4
5
6
7
8
16
OUTC
OUTA
8
1
2
3
4
OUTB
V+
V+
A
B
C
OUTB
OUTA
INA-
15 OUTD
14 GND
13 IND+
12 IND-
11 INC+
10 INC-
V-
INA+
INB-
7
6
5
MAX973
MAX983
REF
INB-
INB+
MAX972
V-
HYST
INA-
INA+
INB-
INB+
REF
MAX974
MAX984
INA+
DIP/SO/µMAX
UCSP
9
V-
DIP/Narrow SO
14 ______________________________________________________________________________________
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
Ordering Information (continued)
PART
TEMP RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
8 SO
PART
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
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
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
0°C to +70°C
PIN-PACKAGE
8 Plastic Dip
8 SO
MAX981CSA
MAX981CUA
MAX981EPA
MAX981ESA
MAX982CPA
MAX982CSA
MAX982CUA
MAX982EPA
MAX982ESA
MAX983CPA
MAX983CSA
MAX983CUA
MAX983EPA
MAX983ESA
MAX984CPE
MAX984CSE
MAX984EPE
MAX984ESE
MAX971EPA
MAX971ESA
MAX972CPA
MAX972CSA
MAX972CUA
MAX972EBL-T*
MAX972EPA
MAX972ESA
MAX973CPA
MAX973CSA
MAX973CUA
MAX973EPA
MAX973ESA
MAX974CPE
MAX974CSE
MAX974EPE
MAX974ESE
MAX981CPA
8 µMAX
8 Plastic Dip
8 SO
8 Plastic Dip
8 SO
8 Plastic Dip
8 SO
8 µMAX
8 UCSP-8
8 Plastic Dip
8 SO
8 µMAX
8 Plastic Dip
8 SO
8 Plastic Dip
8 SO
8 Plastic Dip
8 SO
8 µMAX
8 µMAX
8 Plastic Dip
8 SO
8 Plastic Dip
8 SO
16 Plastic Dip
16 Narrow SO
16 Plastic Dip
16 Narrow SO
8 Plastic Dip
16 Plastic Dip
16 Narrow SO
16 Plastic Dip
16 Narrow SO
*UCSP top mark is “ABC.”
___________________Chip Information
MAX971/MAX972/MAX973/MAX981/MAX982/MAX984
TRANSISTOR COUNT: 164
MAX974/MAX984 TRANSISTOR COUNT: 267
______________________________________________________________________________________ 15
Ultra-Low-Power, Open-Drain,
Single/Dual-Supply Comparators
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
4X S
8
8
MILLIMETERS
INCHES
DIM MIN
MAX
MAX
MIN
-
-
0.043
0.006
0.037
0.014
0.007
0.120
1.10
0.15
0.95
0.36
0.18
3.05
A
0.002
0.030
0.010
0.005
0.116
0.05
0.75
0.25
0.13
2.95
A1
A2
b
E
H
ÿ 0.50 0.1
c
D
e
0.0256 BSC
0.65 BSC
0.6 0.1
E
H
0.116
0.188
0.016
0∞
0.120
2.95
4.78
0.41
0∞
3.05
5.03
0.66
6∞
0.198
0.026
6∞
L
1
1
α
S
0.6 0.1
0.0207 BSC
0.5250 BSC
D
BOTTOM VIEW
TOP VIEW
A1
A2
A
c
α
e
L
b
SIDE VIEW
FRONT VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, 8L uMAX/uSOP
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0036
J
1
INCHES
MILLIMETERS
DIM
A
MIN
MAX
0.069
0.010
0.019
0.010
MIN
1.35
0.10
0.35
0.19
MAX
1.75
0.25
0.49
0.25
0.053
0.004
0.014
0.007
N
A1
B
C
e
0.050 BSC
1.27 BSC
E
0.150
0.228
0.016
0.157
0.244
0.050
3.80
5.80
0.40
4.00
6.20
1.27
E
H
H
L
VARIATIONS:
INCHES
1
MILLIMETERS
DIM
D
MIN
MAX
0.197
0.344
0.394
MIN
4.80
8.55
9.80
MAX
5.00
N
8
MS012
AA
TOP VIEW
0.189
0.337
0.386
D
8.75 14
10.00 16
AB
D
AC
D
C
A
B
0∞-8∞
e
A1
L
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION
TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL
DOCUMENT CONTROL NO.
REV.
1
21-0041
B
1
16 ______________________________________________________________________________________
Ultra Low-Power, Open-Drain,
Single/Dual-Supply Comparators
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 17
© 2003 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
相关型号：
MAX971ESA-T
Comparator, 1 Func, 10000uV Offset-Max, 300000ns Response Time, PDSO8, 0.150 INCH, SOIC-8
MAXIM
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