MAX8216CPD+ [MAXIM]
Power Supply Support Circuit, Fixed, 5 Channel, CMOS, PDIP14, LEAD FREE, PLASTIC, DIP-14;
| 型号： | MAX8216CPD+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 5 Channel, CMOS, PDIP14, LEAD FREE, PLASTIC, DIP-14 光电二极管 |
| 文件： | 总12页 (文件大小：508K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0169; Rev 1; 11/05
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
_______________General Description
____________________________Features
♦ 4 Dedicated Comparators plus 1 Auxiliary
The MAX8215 contains five voltage comparators; four
are for monitoring +5V, -5V, +12V, and -12V, and the
fifth monitors any desired voltage. The MAX8216 is
identical, except it monitors 15V supplies instead of
12V. The resistors reꢀuired to monitor these voltages
and provide comparator hysteresis are included on-
chip. All comparators have open-drain outputs. These
devices consume 250µA max supply current over tem-
perature.
Comparator
♦ 5V Dedicated Comparator Has 1.25% Accuracy
♦ -5V, +12V, -12V, +15V, -15V Dedicated
Comparators Have 1.5% Accuracy
♦ Overvoltage/Undervoltage Detection or
Programmable Delay Using Auxiliary Comparator
♦ Internal 1.24V Reference with 1% Initial Accuracy
♦ Wide Supply Range: 2.7V to 11V
♦ Built-In Hysteresis
♦ 250µA Max Supply Current Over Temp.
♦ Independent Open-Drain Outputs
♦ All Precision Components Included
________________________Applications
Microprocessor Voltage Monitor
+5V, -5V, +12V, -12V Supply Monitoring (MAX8215)
+5V, -5V, +15V, -15V Supply Monitoring (MAX8216)
Overvoltage/Undervoltage Detection with
Uncommitted Comparator
______________Ordering Information
Industrial Controllers
Mobile Radios
Portable Instruments
Industrial Eꢀuipment
Data-Acꢀuisition Systems
PART
TEMP RANGE
0°C to +70°C
PIN-PACKAGE
14 Plastic DIP
14 SO
MAX8215CPD
MAX8215CSD
MAX8215C/D
MAX8215EPD
MAX8215ESD
MAX8215EJD
MAX8215MPD
MAX8215MJD
0°C to +70°C
0°C to +70°C
Dice*
__________Typical Operating Circuit
-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
14 Plastic DIP
14 SO
0.1 F
+5V
14 CERDIP
14 Plastic DIP
14 CERDIP
GND PGND
V
+5V
-5V
DD
OUT1
OUT2
OUT3
OUT4
*Dice are tested at T = +25°C.
A
Devices in PDIP and SO packages are available in both leaded
and lead-free packaging. Specify lead free by adding the +
symbol at the end of the part number when ordering. Lead free
not available for CERDIP package.
MAX8215
MAX8216
Ordering Information continued on last page.
__________________Pin Configuration
TOP VIEW
+12V (+15V)
VREF
GND
V
1
2
3
4
5
6
7
14
13
12
11
10
9
DD
-12V (-15V)
OUT1
OUT2
MAX8215
MAX8216
+5V
-5V
OUT3
OUT4
+12V (+15V)
-12V (-15V)
DIN
DOUT
PGND
DOUT
VREF
DIN
8
DIP/SO
(
) ARE FOR
MAX8216 ONLY.
1.24V REFERENCE
( ) ARE FOR MAX8216 ONLY.
________________________________________________________________ Maxim Integrated Products
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.
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
ABSOLUTE MAXIMUM RATINGS
V
............................................................................-0.3V, +12V
Operating Temperature Ranges:
DD
VREF..............................................................-0.3V, (V
OUT_, DOUT Outputs....................................-0.3V, (V
+5V Input...................................................................+20V, -0.3V
-5V, +12V, +15V, -12V, -15V Inputs..................................... 50V
DIN Input .......................................................(V
Continuous Power Dissipation (T = +70°C)
+ 0.3V)
+ 0.3V)
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 +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
DD
DD
+ 0.3V), -0.3V
DD
A
Plastic DIP (derate 10.00mW/°C above +70°C) ...........800mW
SO (derate 8.33mW/°C above +70°C)..........................667mW
CERDIP (derate 9.09mW/°C above +70°C)..................727mW
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, GND = 0V, T = T
A
to T
, unless otherwise noted.)
MAX
DD
MIN
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
POWER SUPPLY
MAX821_C
2.7
11
11
V
Supply Voltage Range
V
DD
MAX821_E/M
2.85
I
Supply Current
137
250
µA
DD
REFERENCE OUTPUT
T
T
= +25°C
-1.00
-1.5
1.00
1.5
A
MAX821_C
MAX821_E
MAX821_M
Output Voltage Tolerance
Referred to 1.24V
%
-1.75
-2.5
1.75
2.5
= T
to T
MAX
A
MIN
Load Current
40
µA
µV/µA
%/V
Load Regulation
3.3
0.01
15
Line Regulation
Output Tempco
COMPARATOR INPUTS
ppm/°C
V
T
decreasing, T = +25°C
4.521
4.500
4.500
4.464
4.579
4.636
4.657
4.657
4.693
4.749
IN
A
MAX821_C
MAX821_E
MAX821_M
+5V Trip Level
V
= T
to T
MAX
A
MIN
V
increasing
4.636
1.25
1.75
0.8
IN
IN
T
T
T
= +25°C
= +125°C
= -55°C
A
A
A
+5V Trip Level Hysteresis
+12V Trip Level
%
V
V
T
decreasing (MAX8215 only), T = +25°C
A
10.431 10.590 10.749
MAX821_C
10.404
10.378
10.325
10.775
10.802
10.855
= T
to T
MAX
MAX821_E
MAX821_M
A
MIN
V
decreasing (MAX8216 only), T = +25°C
A
13.036 13.235 13.434
IN
MAX821_C
13.003
12.970
12.904
13.467
13.500
13.566
+15V Trip Level
V
T
A
= T
to T
MIN MAX
MAX821_E
MAX821_M
2
_______________________________________________________________________________________
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
ELECTRICAL CHARACTERISTICS (continued)
(V
= +5V, GND = 0V, T = T
A
to T
, unless otherwise noted.)
MAX
DD
MIN
PARAMETER
CONDITIONS
I V I decreasing, T = +25°C
MIN
TYP
MAX
UNITS
-10.431 -10.590 -10.749
IN
A
MAX821_C
MAX821_E
MAX821_M
-10.404
-10.378
-10.325
-10.776
-10.802
-10.855
-12V Trip Level
-15V Trip Level
-5V Trip Level
V
T
= T
to T
A
MIN MAX
I V I decreasing (MAX8216 only), T = +25°C
-13.036 -13.235 -13.434
IN
A
MAX821_C
MAX821_E
MAX821_M
-13.003
-12.970
-12.904
-13.467
-13.500
-13.566
V
V
T
A
= T
to T
MIN MAX
I V I decreasing, T = +25°C
-4.348 -4.415 -4.482
IN
A
MAX821_C
MAX821_E
MAX821_M
-4.337
-4.326
-4.304
-4.493
-4.500
-4.525
2.00
T
= T
to T
A
A
MIN MAX
+15V trip level
+12V trip level
-15V trip level
-12V trip level
-5V trip level
1.25
1.25
1.50
1.50
1.60
0.005
130
2.00
Threshold Hysteresis
T
= +25°C
= +25°C
%
2.25
2.25
2.25
Hysteresis Tempco, 15, 12, -5
Input Resistance
%/°C
k
+5V input to GND
+12V/+15V input to GND
-5V input to REF
168
T
A
160
-12V/-15V input to REF
190
AUXILIARY COMPARATOR INPUT
V
decreasing, T = +25°C
-1.5
0
1.5
1.75
2.00
2.50
2.00
10
IN
A
MAX821_C
-1.75
-2.00
-2.50
Trip Level with Respect to 1.24V
%
MAX821_E
MAX821_M
Threshold Hysteresis
Input Bias Current
T
T
= +25°C
1.25
2
%
A
= +25°C
nA
A
V
V
V
; V = 5V, I
= 2mA
SINK
0.11
0.04
0.10
0.3
0.3
OL DD
Voltage Output Low
Leakage Current
= 1.5V, I
= 1.0V, I
= 0.2mA
= 0.1mA
V
DD
DD
SINK
SINK
Off State
1.0
µA
µs
Comparator Response Time
(All Comparators)
30mV overdrive (Note 1)
20
V
THR
)
Note 1: To overdrive the +5V/+12V/+15V comparators with a 30mV overdrive voltage, use the formula 30mV (1.24
to determine the reꢀuired input voltage. V
is the threshold of the particular overdriven comparator. To overdrive the
THR
V
THR
-5V/-12V/-15V comparators use 30mV
.
[1+
]
I
I 1.24
_______________________________________________________________________________________
3
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
__________________________________________Typical Operating Characteristics
(T =+25°C, unless otherwise noted.)
A
COMPARATOR INPUT BIAS CURRENT
vs. SUPPLY VOLTAGE
COMPARATOR INPUT BIAS CURRENT
OUTPUT VOLTAGE LOW
vs. OUTPUT SINK CURRENT
vs. TEMPERATURE
1.6
1.4
1.2
4
35
30
25
20
10
1.5
5
T = -55°C
A
V
= 5V
DD
3.5
3
T
A
= +25°C
T
A
= +25°C
1
2.5
2
0.8
0.6
0.4
0.2
0
T
A
= +125°C
1.5
1
0.5
0.5
0
0
2
2.5
3
3.5
4
4.5
5
-60 -40 -20
0
20 40 60 80 100 120 140
0 2.0 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
SUPPLY VOLTAGE (V)
TEMPERATURE (C°)
VOL (V)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
REFERENCE VOLTAGE
vs. REFERENCE SOURCE CURRENT
REFERENCE VOLTAGE
vs. SUPPLY VOLTAGE
155
150
145
1.25
1.2
1.238
1.237
1.236
T
A
= +125°C
T
A
= -55°C
T = +25°C
A
T = -55°C
A
T
= +25°C
= -55°C
A
1.15
1.235
V
DD
= 5V
1.234
1.233
1.232
1.231
1.23
140
135
130
125
1.1
1.05
1
T = +125°C
A
T
A
-5V PIN = -5V
-12V PIN = -5V
+5V PIN = +5V
+12V PIN = +12V
NOTE: -55 C IS WORST CASE
CONDITION FOR REFERENCE
REGULATION AT LOW VOLTAGES.
0.95
2
3
4
5
6
7
8
9
10 11 12
0
50
100 150
200 250 300
1
2
3
4
6
7
8
9
10 11
5
SUPPLY VOLTAGE (V)
REFERENCE SOURCE CURRENT (µA)
SUPPLY VOLTAGE (V)
VREF OUTPUT VOLTAGE
vs. TEMPERATURE
1.238
1.237
1.236
V
DD
= 5V
1.235
1.234
1.233
1.232
-55 -35 -15
5
25 45 65 85 105 125
TEMPERATURE (°C)
4
_______________________________________________________________________________________
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
_____________________________Typical Operating Characteristics ꢁcontinuedꢂ
(TA = +25°C, unless otherwise noted.)
+5V RESPONSE WITH
±±110V INPUT EꢀCURSION AROUNꢁ TRIP LEVEL
-5V RESPONSE WITH
±±110V INPUT EꢀCURSION AROUNꢁ TRIP LEVEL
+5V PIN
+5V PIN
OUT1
OUT1
+5V COMP
-5V COMP
ꢁOUT OUTPUT VOLTAGE vs. SUPPLY VOLTAGE
R± = ±5k , R2 = 41k (see Figure 4)
ꢁIN COMPARATOR RESPONSE
WITH 310V OVERꢁRIVE
SUPPLY
VOLTAGE
COMP
OUTPUT
COMP
INPUT
DOUT
OUTPUT
VOLTAGE
ꢁIN COMPARATOR RESPONSE
WITH 510V OVERꢁRIVE
ꢁIN COMPARATOR RESPONSE
WITH ±110V OVERꢁRIVE
COMP
OUTPUT
COMP
OUTPUT
COMP
INPUT
COMP
INPUT
_______________________________________________________________________________________
5
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
_____________________Pin Description
+5V
PIN
1
NAME
VREF
GND
+5V
FUNCTION
OUT1
OUT2
OUT3
OUT4
Output of the internal 1.24V reference
Ground. Connect to PGND.
Input for monitoring +5V supply
Input for monitoring -5V supply
2
-5V
+12V (+15V)
-12V (-15V)
MAX8215
MAX8216
3
4
-5V
+12V
(+15V)
MAX8215 input for monitoring +12V
(MAX8216 input for monitoring +15V)
5
6
7
-12V
(-15V)
MAX8215 input for monitoring -12V
(MAX8216 input for monitoring -15V)
Noninverting input of the auxiliary
comparator. Its inverting input is tied
to the internal reference.
DIN
Power-supply ground. Bypass V
to this pin.
DD
8
9
PGND
DOUT
DOUT
VREF
Output of the auxiliary comparator
DIN
OUT4,
OUT3,
OUT2,
OUT1
10, 11,
12, 13
Outputs of the four dedicated com-
parators
1.24V REFERENCE
V
DD
PGND
GND
Power-supply positive voltage input.
Bypass to PGND.
(
) ARE FOR
MAX8216 ONLY.
14
V
DD
Figure 1. Block Diagram
_______________Detailed Description
__________Applications Information
The MAX8215/MAX8216 contain 5 comparators (Figure
1). The comparator with its output labeled DOUT is dis-
tinguished from the others in that it can be set up to mon-
itor various voltages; each of the other 4 comparators
monitors a specific voltage. The DOUT comparator’s
noninverting input is available external to the device; its
inverting input is tied internally to the reference.
Hysteresis
When the voltage on a typical comparator’s input is
at or near the voltage on the other input, ambient
noise generally causes the comparator output to
oscillate. The most common way to eliminate this
problem is by using hysteresis. When the two com-
parator input voltages are eꢀual, hysteresis causes
one comparator input voltage to move ꢀuickly past
the other, thus taking the input out of the region
where oscillation occurs. Standard comparators
need external resistors for hysteresis; these resistors
are not necessary when using any of the MAX8215
and MAX8216 comparators because hysteresis is
built in.
The MAX8215/MAX8216 comparators have open-drain
outputs. Thus, these devices reꢀuire pull-up resistors
for proper operation. See the Typical Operating Circuit.
Open-drain outputs are useful for driving LEDs and for
situations in which the comparator outputs must be
connected together (i.e., wire-ORed).
Bypass V
with 0.1µF connected to PGND.
DD
6
_______________________________________________________________________________________
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
V
TRIP2
RA
RB
INPUT VOLTAGE
V
HYST
1 +
(
)
(V )
S
V
DD
V
TRIP1
180k
MAX8215
MAX8216
GND
OUTPUT
VOLTAGE
DOUT
9
R
A
DIN
7
+V
S
V
DD
R
B
GND
TO DETERMINE THE TRIP VOLTAGES
FROM PARTICULAR RESISTOR
TO CALCULATE THE REQUIRED
RESISTOR RATIOS FOR PARTICULAR
TRIP VOLTAGES:
1.24V REFERENCE
VALUES:
RA
RA
RB
V
V
REF
TRIP1
V
V
1 +
=
- 1
)
)
TRIP1 = REF
(
RB
V
TRIP
=
R + R (V
REF
)
RA
RB
A
B
RA
RB
V
TRIP2
V
V
(V + V
1 +
(
)
( )
TRIP2 = REF
HYST
=
- 1
R
B
V
+ V
REF
HYST
= 16mV TYP
HYST
Figure 3. Undervoltage/Overvoltage Detector Waveforms and
Formulas
Figure 2. Undervoltage/Overvoltage Comparator Using the
Auxiliary Comparator
Adding hysteresis to a comparator creates two trip
points–one for the input voltage rising and one for the
input voltage falling. When the voltage at the
MAX8215/MAX8216 auxiliary comparator’s (noninvert-
ing) input falls, the threshold at which the comparator
switches eꢀuals the reference voltage connected to the
comparator’s inverting input. However, when the volt-
age at the noninverting input rises, the threshold
eꢀuals the reference voltage plus the amount of hys-
teresis voltage built into the part. The trip point is
somewhat more accurate when the hysteresis voltage
is not part of the threshold voltage (i.e., when the input
voltage is falling) because the tolerance of the hystere-
sis specification adds to the tolerance of the trip point.
0.1 F
8
PGND
14
2
3
GND
+5V
V
DD
13
MAX8215
MAX8216
+V
S
OUT1
DOUT
UNDERVOLTAGE
R1
R2
7
9
DIN
Overvoltage and Undervoltage
Detection Circuits
OVERVOLTAGE
Figure 2 shows connection of the auxiliary comparator
as either an undervoltage or overvoltage comparator.
Hysteresis makes this circuit more accurate when the
input voltage is dropping as opposed to rising. Figure
3 illustrates the comparator’s operation. The input volt-
age’s direction determines at which of two trip points
the comparator switches. Thus, the diagram includes
arrows that indicate whether the input voltage is rising
or falling. The formulas are provided for determining
trip-point voltages for specified resistors and for ease
in calculating appropriate resistor ratios for particular
trip points.
+5V COMPARATOR IS ACTUATED WHEN V FALLS TO THE
S
COMPARATOR'S SPECIFIED TRIP LEVEL. THE AUXILIARY
COMPARATOR OUTPUT IS TRIPPED WHEN V
>
R1 + R2 VREF
S
(
)
R2
Figure 4. Monitoring Supply Powering the MAX8215/MAX8216
with Undervoltage and Overvoltage Comparators
The MAX8215/MAX8216 comparator outputs correctly
display a low level down to 0.8V supply voltage. This is
useful in undervoltage applications where the monitored
power supply is also the supply connected to the V
pin. See the section Monitoring the Supply Voltage.
DD
_______________________________________________________________________________________
7
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
+5V
V
TRIP2
0.1 F
INPUT VOLTAGE
(V )
S
V
TRIP1
8
680k
PGND
14
13
2
3
680k
GND
+5V
V
GND
DD
OUTPUT
VOLTAGE
(OUT1)
V
DD
MAX8215
MAX8216
+V
S
OUT1
DOUT
t
DLY
GND
V
DD
OUTPUT
VOLTAGE
(DOUT)
7
9
DIN
RESET
GND
V
REF
V
TRIP1
V
TRIP2
IS FOR V DECREASING;
S
t
-RC In 1 -
)
DLY =
(
V
CC
IS FOR V INCREASING.
S
1 F
NOTE: V IS THE VOLTAGE AT THE INVERTING PIN OF THE TWO COMPARATORS.
TH
IN THIS CASE, IT IS EQUAL TO THE INTERNAL REFERENCE VOLTAGE.
Figure 5. Microprocessor Reset Circuit with 200ms Time Delay
Figure 6. Microprocessor Reset with Time Delay Waveforms
Figure 7 shows Figure 5’s µP reset circuit, but with the
monitored supply also powering the MAX8215. Figure
6’s waveforms and eꢀuations also apply to this circuit.
Monitoring the Supply ꢀoltage
The supply voltage to these devices can also be moni-
tored by the 5V dedicated comparator and the auxiliary
comparator. Figure 4 shows a circuit that monitors the
The MAX8215/MAX8216 comparator outputs correctly
display a low level down to a 0.8V typical supply voltage.
voltage connected at V
for both overvoltage and
DD
undervoltage conditions. The +5V comparator checks
for undervoltage conditions while the auxiliary compara-
tor monitors overvoltage conditions. In general, no extra
supply bypassing circuitry (other than the normally rec-
ommended 0.1µF capacitor) is reꢀuired when perform-
ing this function. However, using resistor values higher
than 100k at the auxiliary comparator’s input reꢀuires
attention to eliminate potential oscillations. Also, partic-
ularly low pull-up resistor values on DOUT contribute to
the likelihood of the auxiliary comparator’s oscillation.
See the section Eliminating Output Oscillation.
Unused Inputs
When the uncommitted comparator within the
MAX8215/MAX8216 is not used, tie the unused input to
either the positive supply or ground. This prevents noise
generation due to the comparator output switching from
one logic state to another (due to noise at the input).
Output Pull-Up Resistors
Pull-up resistors are reꢀuired at the outputs of each
comparator. Resistor values should not be less than
2.7k if the outputs are pulled up to V . In general,
DD
Microprocessor Reset
____________Circuit with Time Delay
save power by using higher values, e.g., 100k . Use
of higher-value resistors also minimizes the possibility
of oscillations due to a spurious feedback (see the sec-
tion Eliminating Output Oscillation).
It is often necessary to reset a microprocessor (µP) when
its supply voltage drops below a certain level. Figure 5’s
circuit generates a low output when the monitored volt-
age drops below the 5V monitor’s threshold. Additionally,
this output remains low for 200ms after the supply voltage
goes above the threshold. µP reset circuits typically
include this feature because it gives the µP time to be
fully reset after power has been restored, and allows any
capacitors in associated circuitry time to charge. Figure
6 shows this circuit’s waveforms and formulas.
Input ꢀoltage Limitation
If the voltages at the various inputs are kept within the
absolute maximum ratings, the device is not damaged.
However, high input voltages within this range can
cause the reference voltage to move. To prevent the
reference voltage from changing, limit the +5V input to
+17V; the -5V and -15V inputs to +1V; and the +15V
input to +60V. Negative input voltages within the
8
_______________________________________________________________________________________
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
V+
+5V
1k
1k
0.1 F
14
0.1 F
V
DD
13
OUT1
8
680k
PGND
14
2
3
7
680k
GND
V
DD
MAX8215
MAX8216
13
9
MAX8215
MAX8216
+5V
DIN
+V
OUT1
DOUT
S
RESET
Figure 8. Alternate Bypass Scheme
1 F
Figure 7. Microprocessor Reset Circuit Monitoring Its Own
Supply Voltage
MAX8215
MAX8216
9
7
DIN
DOUT
V
IN
absolute maximum ratings have no effect on the refer-
ence. Within the absolute maximum ratings, the DIN
input has no effect on the reference.
Power-Supply Bypassing and Grounding
In high-noise environments where the voltage connected
to V
may change abruptly, the reference voltage may
DD
“bounce,” causing false comparator outputs. Eliminate
this problem using Figure 8’s RC bypass network.
Figure 9. Alternative Means for Reducing Impedance Level
Seen at DIN
Although bypassing the reference may appear to help,
Figure 8’s solution is recommended; bypassing the ref-
erence reduces its voltage change, but doing so caus-
es a time delay prior to the reference voltage returning
to its correct level.
most cases, using input resistor values on the order of
100k creates no problem. Since using lower resistor
values increases the supply current, another approach
is to bypass the input resistors as shown in Figure 9,
although this slows the circuit’s response. When much
larger valued input resistors are used, high valued resis-
tors on the output should be used.
Eliminating Output Oscillation when
Using the Auxiliary Comparator
Although hysteresis is built into the auxiliary comparator,
output oscillation problems are still possible. Oscillation
can occur when a comparator’s output couples back to
its inverting input through stray board capacitance.
Make sure the board trace leading from the comparator
output does not pass near its inverting input (or vice
versa). Also, reducing the resistance connected to DIN
reduces its susceptibility to picking up output signals. In
When DOUT is reꢀuired to sink larger currents (i.e.,
when smaller pull-up resistor values are used), oscilla-
tion problems are more likely to occur. To minimize
power consumption and to optimize stability, use the
largest value pull-up resistor feasible for the output
drive reꢀuired. When lower pull-up resistor values are
used, lower values for the resistors connected to the
inputs can help alleviate oscillation problems.
_______________________________________________________________________________________
9
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
_Ordering Information ꢁcontinuedꢂ
___________________Chip Topography
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
14 Plastic DIP
14 SO
VREF
V
DD
GND
OUT1
MAX8216CPD
MAX8216CSD
MAX8216C/D
MAX8216EPD
MAX8216ESD
MAX8216EJD
MAX8216MPD
MAX8216MJD
0°C to +70°C
0°C to +70°C
Dice*
-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
14 Plastic DIP
14 SO
+5
-5
14 CERDIP
14 Plastic DIP
14 CERDIP
OUT2
OUT3
0.076"
(1.930mm)
+12V
(+15V)
OUT4
* Dice are tested at T = +25°C.
A
-12V
(-15V)
PGND DOUT
DIN
0.066"
(1.676mm)
(
) ARE FOR MAX8216 ONLY.
TRANSISTOR COUNT: 275;
SUBSTRATE CONNECTED TO V
.
DD
10 ______________________________________________________________________________________
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
________________________________________________________Package Information
INCHES
MILLIMETERS
DIM
D1
MIN
MAX
0.200
–
MIN
–
MAX
5.08
–
A
–
A1 0.015
A2 0.125
A3 0.055
0.38
3.18
1.40
0.41
1.27
0.20
18.67
1.27
7.62
6.10
0.150
0.080
0.022
0.065
0.012
0.765
0.080
0.325
0.280
3.81
2.03
0.56
1.65
0.30
19.43
2.03
8.26
7.11
B
0.016
B1 0.050
C
D
0.008
0.735
E
D1 0.050
0.300
E1 0.240
E
E1
D
e
0.100 BSC
0.300 BSC
2.54 BSC
7.62 BSC
A3
e
e
A
B
A2
A1
A
L
–
0.115
0˚
0.400
0.150
15˚
–
2.92
0˚
10.16
3.81
L
15˚
21-330A
14-PIN PLASTIC
DUAL-IN-LINE
PACKAGE
C
e
B1
e
e
A
B
B
______________________________________________________________________________________ 11
5ꢀ, 12ꢀ ꢁ 15ꢀꢂ Dedicated
Microprocessor ꢀoltage Monitors
___________________________________________Package Information ꢁcontinuedꢂ
INCHES
MILLIMETERS
DIM
MIN
0.053
A1 0.004
MAX
0.069
0.010
0.019
0.010
0.344
0.157
MIN
1.35
0.10
0.35
0.19
8.55
3.80
MAX
1.75
0.25
0.49
0.25
8.75
4.00
A
B
C
D
E
e
0.014
0.007
0.337
0.150
E
H
0.050 BSC
1.27 BSC
H
h
L
0.228
0.010
0.016
0˚
0.244
0.020
0.050
8˚
5.80
0.25
0.40
0˚
6.20
0.50
1.27
8˚
21-331A
h x 45˚
D
A
0.127mm
0.004in.
14-PIN PLASTIC
SMALL-OUTLINE
PACKAGE
e
A1
C
B
L
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 ꢁ408ꢂ 737-7600
© 2005 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products, Inc.
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