MAX8211ESA-T [MAXIM]
Power Supply Support Circuit, Adjustable, 1 Channel, CMOS, PDSO8, SOP-8;
| 型号： | MAX8211ESA-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Adjustable, 1 Channel, CMOS, PDSO8, SOP-8 微处理器 监控 |
| 文件： | 总8页 (文件大小：69K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0539; Rev 3; 1/95
Mic ro p ro c e s s o r Vo lt a g e Mo n it o rs
w it h P ro g ra m m a b le Vo lt a g e De t e c t io n
/MAX812
________________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 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.
♦ Improved 2nd Source for ICL8211/ICL8212
♦ Low-Power CMOS Design
♦ 5µA Quiescent Current
♦ On-Board Hysteresis Output
♦ ±40mV Threshold Accuracy (±3.5%)
♦ 2.0V to 16.5V Supply-Voltage Range
♦ Define Output Current Limit (MAX8211)
♦ 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).
_______________Ord e rin g In fo rm a t io n
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 a va ila b le c urre nt from the hys te re s is outp ut.
PART
TEMP. RANGE
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX8211CPA
MAX8211CSA
MAX8211CUA
MAX8211CTY
MAX8211EPA
MAX8211ESA
MAX8211EJA
MAX8211ETY
MAX8211MJA
MAX8211MTV
0°C to +70°C
0°C to +70°C
0°C to +70°C
8 µMAX
0°C to +70°C
8 TO-99
-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
8 Plastic DIP
8 SO
________________________Ap p lic a t io n s
µP Voltage Monitoring
8 CERDIP
8 TO-99
Undervoltage Detection
8 CERDIP
8 TO-99
Overvoltage Detection
Ordering Information continued on last page.
* Contact factory for dice specifications.
Battery-Backup Switching
Power-Supply Fault Monitoring
Low-Battery Detection
___________________P in Co n fig u ra t io n
___________Typ ic a l Op e ra t in g Circ u it
V+
TOP VIEW
R3
V+
N.C.
1
8
7
6
5
V+
HYST
µP
NMI
OUT
N.C.
2
3
HYST
THRESH
OUT
MAX8211
MAX8212
R2
MAX8211
N.C.
THRESH
GND
4
GND
R1
DIP/SO
LOGIC-SUPPLY UNDERVOLTAGE DETECTOR
(Detailed Circuit Diagram–Figure 5)
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .
Mic ro p ro c e s s o r Vo lt a g e Mo n it o rs
w it h P ro g ra m m a b le Vo lt a g e De t e c t io n
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
Continuous Power Dissipation (TA = +70°C)
CERDIP (derate 8.00mW/°C above +70°C)...................640mW
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, 10sec) .............................+300°C
Plastic DIP (derate 9.09mW/°C above +70°C) ..............727mW
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
MIN TYP MAX MIN TYP MAX
MAX8212
PARAMETER
Supply Current
SYMBOL
CONDITIONS
= +25°C
UNITS
T
A
5
15
20
5
15
20
2V ≤ V+ ≤ 16.5V,
GND ≤ V ≤ V+
I+
µA
/MAX812
TH
T
= T to T
MIN MAX
A
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
A
= T
to T
MIN MAX
V+ = 2.2V, I
= 500µA
OUT
Threshold Voltage
Disparity between Output
and Hysteresis Output
I
= 4mA,
= 1mA
OUT
V
THP
±0.1
±0.1
mV
I
HYST
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
SUPP
T
A
= T to T
MIN MAX
Typical Operating
Supply Voltage Range
V
SUPP
1.5
16.5 1.5
16.5
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
= 16.5V, V = 1.0V
TH
V
,
MAX
= 16.5V, V = 1.3V
10
1
OUT
TH
T
A
= T
to T
MIN
C/E temp. ranges
V
OUT
= 5V, V = 1.0V
1
TH
V
OUT
= 5V, V = 1.3V
TH
I
µA
LOUT
V
OUT
= 16.5V, V = 0.9V
30
10
TH
V
to T ,
MAX
= 16.5V, V = 1.3V
30
10
T
A
= T
OUT
TH
MIN
M temp. range
V
OUT
= 5V, V = 0.9V
TH
V
OUT
= 5V, V = 1.3V
TH
2
_______________________________________________________________________________________
Mic ro p ro c e s s o r Vo lt a g e Mo n it o rs
w it h P ro g ra m m a b le Vo lt a g e De t e c t io n
/MAX812
ELECTRICAL CHARACTERISTICS (continued)
(V+ = 5V, T = +25°C, unless otherwise noted.)
A
MAX8211
MIN TYP MAX MIN TYP MAX
MAX8212
PARAMETER
SYMBOL
CONDITIONS
= 2mA, V = 1.0V
UNITS
V
I
0.17 0.4
OUT
TH
Output Saturation Voltage
V
OL
I
= 2mA, V = 1.3V
0.17 0.4
OUT
TH
V
= 1.0V (Note 1)
= 1.3V (Note 2)
4
7.0
TH
Maximum Available
Output Current
C temp. range,
= 5V
I
OH
mA
V
OUT
V
TH
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,
HYS
HYST TH
-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
2
2
mA
TH
HYS
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.
_______________De t a ile d De s c rip t io n
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
Co m p a t ib ilit y w it h ICL8 2 1 1 /ICL8 2 1 2
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
Mic ro p ro c e s s o r Vo lt a g e Mo n it o rs
w it h P ro g ra m m a b le Vo lt a g e De t e c t io n
V+
V+
V+
V
IN
R2
P
THRESH
HYST
OUT
R3
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
c omp a ra tor inp ut (THRESH p in) is a low-le a ka g e
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.
__________Ap p lic a t io n s In fo rm a t io n
Ba s ic Vo lt a g e De t e c t o rs
Figure 3 shows the basic circuit for both undervoltage
d e te c tion (MAX8211) a nd ove rvolta g e d e te c tion
(MAX8212). For applications where no hysteresis is
needed, R3 should be omitted. The ratio of R1 to R2 is
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.
then chosen such that, for the desired trip voltage at V ,
IN
1.15V is applied to the THRESH pin. Since the com-
parator inputs are very low-leakage MOSFET transis-
tors, the MAX8211/MAX8212 c a n use muc h highe r
resistors values in the attenuator network than can the
bipolar ICL8211/ICL8212. See Table 1 for switching
delays.
Most voltage detection circuits operate with supplies of
15V or le s s ; in the s e a p p lic a tions , 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
a pp lic a tions whe re this ra ting c ould be e xc e e d e d.
Exercise caution when replacing ICL8211/ICL8212s in
c los e d -loop a p p lic a tions s uc h a s p rog ra mma b le
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
40µs
MAX8212
250µs
t(on)
t(off)
1.5ms
3ms
Vo lt a g e De t e c t o rs w it h Hys t e re s is
To ensure noise-free output switching, hysteresis is
fre q ue ntly us e d in volta g e d e te c tors . For b oth the
MAX8211 a nd MAX8212 the HYST outp ut 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
_______________________________________________________________________________________
Mic ro p ro c e s s o r Vo lt a g e Mo n it o rs
w it h P ro g ra m m a b le Vo lt a g e De t e c t io n
/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
48.7k
1%
V+
V+ = 16.5V
V+ = 2V
HYST
MAX8211
V
OUT
R2
20M
1%
(LOW FOR
< 4.5V)
OUT
GND
V
IN
THRESH
R1
750k
1%
-55
-25
25
(°C)
75
125
T
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:
V
using the formula:
U
(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
(V − V )
U
L
R3
= R1 ×
hysteresis, where V is the lower trip point:
1.15V
L
(V + − V
TH
)
(V + − 1.15V)
R3
=
R2 ×
= R2 ×
Lo w -Vo lt a g e De t e c t o r fo r Lo g ic S u p p ly
(V − V )
(V − V )
U L
U
L
The circuit of Figure 5 will detect when a 5.0V (nominal)
+
supply goes below 4.5V, which is the V
normally
or, if V = V :
MIN
IN
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
)
(V −1.15V)
L
L
TH
R3
=
R2 ×
= R2 ×
(V − V )
(V − V )
U
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
Mic ro p ro c e s s o r Vo lt a g e Mo n it o rs
w it h P ro g ra m m a b le Vo lt a g e De t e c t io n
_____________________________________________P in Co n fig u ra t io n s (c o n t in u e d )
TOP VIEW
TOP VIEW
HYST
8
V+
THRESH
OUT 2
N.C.
7
5
1
3
1
2
3
4
8
7
6
5
OUT
N.C.
N.C.
GND
THRESH
HYST
N.C.
6
N.C.
MAX8211
MAX8212
N.C.
4
V+
GND
µMAX
TO-99*
*
CASE IS CONNECTED TO PIN 7 ON TV PACKAGE.
CASE IS CONNECTED TO PIN 4 ON TY PACKAGE.
/MAX812
_Ord e rin g In fo rm a t io n (c o n t in u e d )
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
8 Plastic DIP
8 SO
MAX8212CPA
MAX8212CSA
MAX8212CUA
MAX8212CTY
MAX8212EPA
MAX8212ESA
MAX8212EJA
MAX8212ETY
MAX8212MJA
MAX8212MTV
0°C to +70°C
0°C to +70°C
8 µMAX
0°C to +70°C
8 TO-99
-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
8 Plastic DIP
8 SO
8 CERDIP
8 TO-99
8 CERDIP
8 TO-99
* Contact factory for dice specifications.
6
_______________________________________________________________________________________
Mic ro p ro c e s s o r Vo lt a g e Mo n it o rs
w it h P ro g ra m m a b le Vo lt a g e De t e c t io n
/MAX812
________________________________________________________P a c k a g e In fo rm a t io n
INCHES
MILLIMETERS
DIM
MIN
0.036
MAX
0.044
0.008
0.014
0.007
0.120
0.120
MIN
0.91
0.10
0.25
0.13
2.95
2.95
MAX
1.11
0.20
0.36
0.18
3.05
3.05
A
C
A1 0.004
α
A
B
C
D
E
e
0.010
0.005
0.116
0.116
0.101mm
0.004 in
e
B
A1
L
0.0256
0.65
H
L
0.188
0.016
0°
0.198
0.026
6°
4.78
0.41
0°
5.03
0.66
6°
α
E
H
8-PIN µMAX
MICROMAX SMALL OUTLINE
PACKAGE
D
INCHES
MILLIMETERS
DIM
MIN
MAX
0.069
0.010
0.019
0.010
0.157
MIN
1.35
0.10
0.35
0.19
3.80
MAX
1.75
0.25
0.49
0.25
4.00
A
0.053
D
A1 0.004
B
C
E
e
0.014
0.007
0.150
0°-8°
A
0.101mm
0.004in.
0.050
1.27
e
H
L
0.228
0.016
0.244
0.050
5.80
0.40
6.20
1.27
A1
C
B
L
INCHES
MILLIMETERS
DIM PINS
SO
MIN MAX
MIN
MAX
5.00
8.75
8
0.189 0.197 4.80
D
D
D
SMALL OUTLINE
PACKAGE
E
H
14 0.337 0.344 8.55
16 0.386 0.394 9.80 10.00
(0.150 in.)
21-0041A
_______________________________________________________________________________________
7
Mic ro p ro c e s s o r Vo lt a g e Mo n it o rs
w it h P ro g ra m m a b le Vo lt a g e De t e c t io n
___________________________________________P a c k a g e In fo rm a t io n (c o n t in u e d )
INCHES
MILLIMETERS
DIM
E
MIN
MAX
0.200
–
MIN
–
MAX
5.08
–
A
–
E1
D
A1 0.015
A2 0.125
A3 0.055
0.38
3.18
1.40
0.41
1.14
0.20
0.13
7.62
6.10
2.54
7.62
–
0.175
0.080
0.022
0.065
0.012
0.080
0.325
0.310
–
4.45
2.03
0.56
1.65
0.30
2.03
8.26
7.87
–
A3
A2
A1
A
L
B
0.016
B1 0.045
0.008
D1 0.005
0.300
E1 0.240
0.100
eA 0.300
C
0° - 15°
E
C
e
e
B1
eA
eB
–
–
B
eB
L
–
0.400
0.150
10.16
3.81
0.115
2.92
D1
INCHES
MILLIMETERS
/MAX812
DIM
Plastic DIP
PLASTIC
DUAL-IN-LINE
PACKAGE
(0.300 in.)
PINS
MIN
MAX MIN
MAX
8
D
D
D
D
D
D
0.348 0.390 8.84
9.91
14
16
18
20
24
0.735 0.765 18.67 19.43
0.745 0.765 18.92 19.43
0.885 0.915 22.48 23.24
1.015 1.045 25.78 26.54
1.14 1.265 28.96 32.13
INCHES
MILLIMETERS
DIM
φD
MIN
MAX
0.185
0.019
0.021
0.375
0.335
0.160
MIN
4.19
0.41
0.41
8.51
7.75
2.79
MAX
4.70
0.48
0.53
9.40
8.51
4.06
A
0.165
0.016
φD1
φb
φb1 0.016
φD 0.335
φD1 0.305
φD2 0.110
F
L1
Q
A
L2
e
e1
F
0.200 BSC
0.100 BSC
5.08 BSC
2.54 BSC
L
BASE &
SEATING
PLANE
φb
–
0.040
0.034
0.045
0.750
0.050
–
–
1.02
0.86
1.14
19.05
1.27
–
k
0.027
0.027
0.500
–
0.69
0.69
12.70
–
φb1
e
k1
L
e1
L1
L2
Q
α
0.250
0.010
6.35
0.25
β
0.045
1.14
45° BSC
45° BSC
45° BSC
β
45° BSC
21-0022A
α
8-PIN
φD2
TO-99 METAL CAN
PACKAGE
k1
k
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.
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© 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
相关型号：
MAX8211IPA
Power Supply Support Circuit, Adjustable, 1 Channel, CMOS, PDIP8, 0.300 INCH, PLASTIC, MS-001AB, DIP-8
ROCHESTER
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