MAX8211EPA [ROCHESTER]
Power Supply Support Circuit, Adjustable, 1 Channel, CMOS, PDIP8, PLASTIC, DIP-8;
| 型号： | MAX8211EPA |
| 厂家： | 
Rochester Electronics |
| 描述： | Power Supply Support Circuit, Adjustable, 1 Channel, CMOS, PDIP8, PLASTIC, DIP-8 光电二极管 |
| 文件： | 总8页 (文件大小：772K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0539; Rev 5; 9/08
Microprocessor Voltage Monitors
with Programmable Voltage Detection
/MAX812
________________General Description
____________________________Features
o µP Power-Fail Warning
Maxim’s MAX8211 and MAX8212 are CMOS micropower
voltage detectors that warn microprocessors (µPs) of
power failures. Each contains a comparator, a 1.5V
bandgap reference, and an open-drain n-channel output
driver. Two external resistors are used in conjunction with
the internal reference to set the trip voltage to the desired
level. A hysteresis output is also included, allowing the user
to apply positive feedback for noise-free output switching.
o Improved 2nd Source for ICL8211/ICL8212
o Low-Power CMOS Design
o 5µA Quiescent Current
o On-Board Hysteresis Output
o
40mV Threshold Accuracy ( 3.5%)
o 2.0V to 16.5V Supply-Voltage Range
o Define Output Current Limit (MAX8211)
o High Output Current Capability (MAX8212)
The MAX8211 provides a 7mA current-limited output sink
whenever the voltage applied to the threshold pin is less
than the 1.5V internal reference. In the MAX8212, a voltage
greater than 1.5V at the threshold pin turns the output
stage on (no current limit).
_______________Ordering Information
The CMOS MAX8211/MAX8212 are plug-in replacements
for the bipolar ICL8211/ICL8212 in applications where the
maximum supply voltage is less than 16.5V. They offer sev-
eral performance advantages, including reduced supply
current, a more tightly controlled bandgap reference, and
more available current from the hysteresis output.
PIN-
PACKAGE
PART
TEMP RANGE
MAX8211CPA
MAX8211CSA
MAX8211CUA
MAX8211CTY
MAX8211EPA
MAX8211ESA
MAX8211EJA
MAX8211ETY
MAX8211MJA
-0°C to +70°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
-40°C to +85°C
-55°C to +125°C
8 Plastic DIP
8 SO
8 µMAX
8 TO-99
________________________Applications
8 Plastic DIP
8 SO
µP Voltage Monitoring
8 CERDIP
8 TO-99
Undervoltage Detection
Overvoltage Detection
Battery-Backup Switching
Power-Supply Fault Monitoring
Low-Battery Detection
8 CERDIP**
Ordering Information continued on last page.
*Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
_________________Pin Configurations
___________Typical Operating Circuit
V+
TOP VIEW
R3
V+
N.C.
1
8
7
6
5
V+
HYST
µP
NMI
OUT
N.C.
2
3
HYST
THRESH
OUT
R2
MAX8211
MAX8212
MAX8211
N.C.
GND
THRESH
GND
4
R1
DIP/SO
LOGIC-SUPPLY UNDERVOLTAGE DETECTOR
(DETAILED CIRCUIT DIAGRAM—FIGURE 5)
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Microprocessor Voltage Monitors
with Programmable Voltage Detection
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .......................................................-0.5V to +18V
Output Voltage .......................................................-0.5V to +18V
Hysteresis...................+0.5V to -18V with respect to (V+ + 0.5V)
Threshold Input Voltage ...............................-0.5V to (V+ + 0.5V)
Current into Any Terminal................................................. 50mA
8-Pin CERDIP (derate 8.00mW/°C above +70°C)..........640mW
8-Pin TO-99 (derate 6.67mW/°C above +70°C).............533mW
Operating Temperature Ranges
MAX821_C_ _ .......................................................0°C to +70°C
MAX821_E_ _.....................................................-40°C to +85°C
MAX821_M_ _..................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Continuous Power Dissipation (T = +70°C)
A
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) .....727mW
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mW
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, T = +25°C, unless otherwise noted.)
A
MAX8211
MAX8212
PARAMETER
Supply Current
SYMBOL
CONDITIONS
UNITS
MIN TYP MAX MIN TYP MAX
T
T
= +25°C
5
15
20
5
15
20
A
2V ≤ V+ ≤ 16.5V,
GND ≤ V ≤ V+
I+
µA
/MAX812
TH
= T
to T
MAX
A
MIN
V+ = 16.5V, I
= 4mA
OUT
T
= +25°C
1.11
1.05
1.19 1.11
1.25 1.05
1.19
1.25
A
V+ = 2V, I
= 500µA
OUT
Threshold Trip Voltage
V
TH
V
V+ = 16.5V, I
= 3mA
OUT
T = T
A
to T
MAX
MIN
V+ = 2.2V, I
= 500µA
OUT
Threshold Voltage
Disparity between Output
and Hysteresis Output
I
I
= 4mA,
= 1mA
OUT
HYST
V
THP
0.1
0.1
mV
T
T
= +25°C
2.0
2.2
16.5 2.0
16.5 2.2
16.5
16.5
A
Guaranteed Operating
Supply Voltage Range
V
V
V
V
SUPP
= T
to T
MAX
A
MIN
Typical Operating
Supply Voltage Range
1.5
16.5 1.5
16.5
SUPP
Threshold Voltage
Temperature Coefficient
∆V
TH/∆T
See Figure 4
V+ = 4.5V to 5.5V
-200
1.0
-200
0.2
ppm/°C
mV
Variation of Threshold
Voltage with Supply Voltage
∆V
TH
0V ≤ V ≤ V+, T = +25°C
0.01 10
20
0.01 10
TH
A
Threshold Input Current
Output Leakage Current
I
nA
TH
T
A
= T
to T
20
10
MIN
MAX
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
= 16.5V, V = 1.0V
TH
= 16.5V, V = 1.3V
10
1
TH
T = T
C/E temp. ranges
to T
,
A
MIN
MAX
= 5V, V = 1.0V
1
TH
= 5V, V = 1.3V
TH
I
µA
LOUT
= 16.5V, V = 0.9V
30
10
TH
= 16.5V, V = 1.3V
30
10
TH
T = T
to T
,
A
MIN
MAX
M temp. range
= 5V, V = 0.9V
TH
= 5V, V = 1.3V
TH
2
_______________________________________________________________________________________
Microprocessor Voltage Monitors
with Programmable Voltage Detection
/MAX812
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, T = +25°C, unless otherwise noted.)
A
MAX8211
MAX8212
PARAMETER
SYMBOL
CONDITIONS
= 2mA, V = 1.0V
UNITS
V
MIN TYP MAX MIN TYP MAX
I
I
0.17 0.4
OUT
TH
Output Saturation Voltage
V
OL
= 2mA, V = 1.3V
0.17 0.4
OUT
TH
V
TH
V
TH
= 1.0V (Note 1)
= 1.3V (Note 2)
4
7.0
Maximum Available
Output Current
C temp. range,
I
mA
OH
V
OUT
= 5V
12
35
T
A
= T
to T
, C/E temp. ranges,
MAX
MIN
V+ = 16.5V, V = 1.0V,
0.1
3
0.1
3
TH
V
HYST
= -16.5V with respect to V+
Hysteresis Leakage
Current
I
µA
LHYS
T
A
= T
to T
, M temp. range,
MAX
MIN
V+ = 16.5V, V = 0.9V,
TH
V
HYST
= -16.5V with respect to V+
Hysteresis Saturation
Voltage
V
I
= 0.5mA, V = 1.3V,
TH
HYS
HYST
-0.1 -0.2
10
-0.1 -0.2
10
V
(MAX) measured with respect to V+
Maximum Available
Hysteresis Current
V
HYS
(MAX)
V
= 1.3V, V
= 0V
HYS
2
2
mA
TH
Note 1: The maximum output current of the MAX8211 is limited by design to 30mA under any operating condition. The output voltage
may be sustained at any voltage up to +16.5V as long as the maximum power dissipation of the device is not exceeded.
Note 2: The maximum output current of the MAX8212 is not defined, and systems using the MAX8212 must therefore ensure that the
output current does not exceed 50mA and that the maximum power dissipation of the device is not exceeded.
_______________Detailed Description
As shown in the block diagrams of Figures 1 and 2, the
V+
MAX8211 and MAX8212 each contain a 1.15V refer-
ence, a comparator, an open-drain n-channel output
P
THRESH
transistor, and an open-drain p-channel hysteresis out-
put. The MAX8211 output n-channel turns on when the
voltage applied to the THRESH pin is less than the
internal reference (1.15V). The sink current is limited to
7mA (typical), allowing direct drive of an LED without a
series resistor. The MAX8212 output turns on when the
voltage applied to THRESH is greater than the internal
reference. It is not current limited, and will typically sink
35mA.
HYST
OUT
N
1.15V
REFERENCE
Compatibility with ICL8211/ICL8212
The CMOS MAX8211/MAX8212 are plug-in replacements
for the bipolar ICL8211/ICL8212 in most applications.
The use of CMOS technology has several advantages.
The quiescent supply current is much less than in the
bipolar parts. Higher-value resistors can also be used
Figure 1. MAX8211 Block Diagram
________________________________________________________________________________________
3
Microprocessor Voltage Monitors
with Programmable Voltage Detection
V+
V+
V
IN
R2
V+
P
R3
THRESH
HYST
OUT
HYST
V
OUT
OUT
GND
MAX8211
MAX8212
THRESH
1.15V
REFERENCE
N
R1
Figure 2. MAX8212 Block Diagram
Figure 3. Basic Overvoltage/Undervoltage Circuit
/MAX812
in the networks that set up the trip voltage, since the
comparator input (THRESH pin) is a low-leakage
MOSFET transistor. This further reduces system current
drain. The tolerance of the internal reference has also
been significantly improved, allowing for more precise
voltage detection without the use of potentiometers.
__________Applications Information
Basic Voltage Detectors
Figure 3 shows the basic circuit for both undervoltage
detection (MAX8211) and overvoltage detection
(MAX8212). For applications where no hysteresis is
needed, R3 should be omitted. The ratio of R1 to R2 is
then chosen such that, for the desired trip voltage at VIN,
1.15V is applied to the THRESH pin. Since the com-
parator inputs are very low-leakage MOSFET transis-
tors, the MAX8211/MAX8212 can use much higher
resistors values in the attenuator network than can the
bipolar ICL8211/ICL8212. See Table 1 for switching
delays.
The available current from the HYST output has been
increased from 21µA to 10mA, making the hysteresis
feature easier to use. The disparity between the HYST
output and the voltage required at THRESH to switch
the OUT pin has also been reduced in the MAX8211
from 8mV to 0.1mV to eliminate output “chatter” or
oscillation.
Most voltage detection circuits operate with supplies of
15V or less; in these applications, the MAX8211/
MAX8212 will replace ICL8211/ICL8212s with the per-
formance advantages described above. However, note
that the CMOS parts have an absolute maximum sup-
ply-voltage rating of 18V, and should never be used in
applications where this rating could be exceeded.
Exercise caution when replacing ICL8211/ICL8212s in
closed-loop applications such as programmable
zeners. Although neither the ICL8211/ICL8212 nor the
MAX8211/MAX8212 are internally compensated, the
CMOS parts have higher gain and may not be stable
for the external compensation-capacitor values used in
lower-gain ICL8211/ICL8212 circuits.
Table 1. Switching Delays
TYPICAL DELAYS
MAX8211
MAX8212
250µs
t
40µs
(on)
t
1.5ms
3ms
(off)
Voltage Detectors with Hysteresis
To ensure noise-free output switching, hysteresis is
frequently used in voltage detectors. For both the
MAX8211 and MAX8212 the HYST output is on for
threshold voltages greater than 1.15V. R3 (Figure 3)
controls the amount of current (positive feedback) sup-
plied from the HYST output to the mid-point of the resis-
tor divider, and hence the magnitude of the hysteresis,
or dead-band.
4
________________________________________________________________________________________
Microprocessor Voltage Monitors
with Programmable Voltage Detection
/MAX812
V
IN
1.250
1.230
1.210
1.190
1.170
1.150
1.130
1.110
1.090
1.070
1.050
R3
48.7kΩ
1%
V+
V+ = 16.5V
V+ = 2V
HYST
MAX8211
V
OUT
R2
2.2MΩ
1%
(LOW FOR
< 4.5V)
OUT
GND
V
IN
THRESH
R1
750kΩ
1%
-55
-25
25
75
125
T (°C)
A
Figure 4. MAX8211/MAX8212 Threshold Trip Voltage vs.
Ambient Temperature
Figure 5. MAX8211 Logic-Supply Low-Voltage Detector
Calculate resistor values for Figure 5 as follows:
Calculate resistor values for Figure 3 as follows:
1) Choose a value for R1. Typical values are in
1) Choose a value for R1. Typical values are in
the 10kΩ to 10MΩ range.
the 10kΩ to 10MΩ range.
2) Calculate R2 for the desired upper trip point
2) Calculate R2:
VU using the formula:
(V − V
)
(V − 1.15V)
L
TH
L
R2 = R1 ×
= R1 ×
(V − V
TH
)
(V − 1.15V)
V
1.15V
U
U
TH
R2 = R1 ×
= R1 ×
V
1.15V
TH
3) Calculate R3:
3) Calculate R3 for the desired amount of
hysteresis, where VL is the lower trip point:
(V − V )
1.15V
U
L
R3 = R1 ×
(V + − V
)
(V + − 1.15V)
(V − V )
U L
TH
R3 = R2 ×
= R2 ×
Low-Voltage Detector for Logic Supply
The circuit of Figure 5 will detect when a 5.0V (nominal)
supply goes below 4.5V, which is the VMIN normally
specified in logic systems. The selected resistor values
ensure that false undervoltage alarms will not be gener-
ated, even with worst-case threshold trip values and
resistor tolerances. R3 provides approximately 75mV of
hysteresis.
(V − V )
U
L
or, if V+ = VIN:
(V − V
TH
(V − V )
U
)
(V − 1.15V)
L
L
R3 = R2 ×
= R2 ×
(V − V )
L
U L
Figure 5 shows an alternate circuit, suitable only when the
voltage being detected is also the power-supply voltage
for the MAX8211 or MAX8212.
________________________________________________________________________________________
5
Microprocessor Voltage Monitors
with Programmable Voltage Detection
_____________________________________________Pin Configurations (continued)
TOP VIEW
TOP VIEW
HYST
8
V+
THRESH
7
5
1
3
1
2
3
4
8
7
6
5
OUT
N.C.
N.C.
GND
6
N.C.
THRESH
HYST
N.C.
OUT
2
MAX8211
MAX8212
N.C.
4
N.C.
V+
GND
µMAX
TO-99*
*
CASE IS CONNECTED TO PIN 7 ON TV PACKAGE.
CASE IS CONNECTED TO PIN 4 ON TY PACKAGE.
/MAX812
Package Information
_Ordering Information (continued)
For the latest package outline information and land patterns, go
PIN-
PACKAGE
to www.maxim-ic.com/packages.
PART
TEMP RANGE
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
MAX8211MSA/PR
MAX8211MSA/PR-T
MAX8211MTV
MAX8212CPA
MAX8212CSA
MAX8212CUA
MAX8212CTY
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-0°C to +70°C
8 SO**
8 CERDIP
8 Plastic DIP
8 SO
J8-2
P8-1
S8-2
T99-8
U8-1
21-0045
21-0043
21-0041
21-0022
21-0036
8 SO**
8 TO-99**
8 Plastic DIP
8 SO
-0°C to +70°C
8 TO-99
-0°C to +70°C
8 µMAX
8 TO-99
8 Plastic DIP
8 SO
8 µMAX
-0°C to +70°C
MAX8212EPA
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
-55°C to +125°C
MAX8212ESA
MAX8212EJA
8 CERDIP
8 TO-99
8 CERDIP**
8 SO**
MAX8212ETY
MAX8212MJA
MAX8212MSA/PR
MAX8212MSA/PR-T
MAX8212MTV
8 SO**
8 TO-99**
*Contact factory for dice specifications.
**Contact factory for availability and processing to MIL-STD-883.
6
_______________________________________________________________________________________
Microprocessor Voltage Monitors
with Programmable Voltage Detection
/MAX812
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
0
4
5
1/91
9/02
9/08
Initial release
—
5
Updated Figure 5.
Updated Ordering Information.
1, 6
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.
7 ___________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600
© 2008 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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