MAX6808UR46+T [MAXIM]
Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN;
| 型号： | MAX6808UR46+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PDSO3, SOT-23, 3 PIN 光电二极管 |
| 文件： | 总9页 (文件大小：845K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX6806/MAX6807/
MAX6808
Voltage Detectors
General Description
Features
● Preset Reset Thresholds: 4.6V and 2.6V
The MAX6806/MAX6807/MAX6808 precision voltage
detectors are ideal for accurate monitoring of power
supplies in digital systems. They provide circuit reliability
and reduce total cost by eliminating external components
and adjustments.
(2.3V also available for MAX6806 only)
● ±2% Accurate Reset Thresholds
● Reset Output Available in Active-Low (MAX6806),
Active-High (MAX6807), and Open-Drain (MAX6808)
Versions
The MAX6806/MAX6807/MAX6808 assert a reset signal
whenever the supply voltage (V ) falls below the factory-
CC
● Immune to Power-Supply Transients
preset, ±2% accurate threshold. Internal hysteresis
ensures stable switching. The MAX6806/MAX6807/
MAX6808 are available in 4.6V and 2.6V thresholds (2.3V
is also available for the MAX6806 only). The MAX6806
features an active-low, push-pull RESET output; the
MAX6807 features an active-high, push-pull RESET
output; and the MAX6808 features an active-low, open-
● RESET Valid to V
= 1.0V (MAX6806/MAX6808)
CC
● 35µA Supply Current
● No External Components
● Manual Reset Available with 4-Pin SOT143 Package
● Miniature 3-Pin SC70, 3-Pin SOT23, and 4-Pin
drain RESET output. RESET is valid for V
(MAX6806/MAX6808), and RESET (MAX6807) is guar-
down to 1V
CC
SOT143 Packages
● 8-Pin µMAX and 8-Pin SO Packages are Pin
Compatible with the MC33064/MC33164/
MC34064/MC34164
anteed for V down to 1.2V.
CC
The MAX6806/MAX6807/MAX6808 are available in
3-pin SC70, 3-pin SOT23, 8-pin µMAX, 8-pin SO, and
4-pin SOT143 packages. The SOT143 package includes
a manual-reset input.
Ordering Information
PART
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
3 SC70
Applications
● Computers
● Controllers
● Intelligent Instruments
● Critical µP and µC
Power Monitoring
MAX6806XR_ _ -T
MAX6806UR_ _ -T
MAX6806US_ _ -T
MAX6806UA_ _
MAX6806SA_ _
MAX6807XR_ _ -T
MAX6807UR_ _ -T
MAX6807US_ _ -T
MAX6807UA_ _
MAX6807SA_ _
MAX6808XR_ _ -T
MAX6808UR_ _ -T
MAX6808US_ _ -T
MAX6808UA_ _
MAX6808SA_ _
● Portable/Battery-
● Powered Equipment
● Bar-Code Scanners
3 SOT23
4 SOT143
8 µMAX
8 SO
3 SC70
Selector Guide and Pin Configurations appear at end of
data sheet.
3 SOT23
4 SOT143
8 µMAX
8 SO
Typical Operating Circuit
V
CC
V
V
CC
CC
3 SC70
3 SOT23
4 SOT143
8 µMAX
8 SO
MAX6806
MAX6807
MAX6808
µP
RESET
INPUT
(RESET)/RESET
* SOT23, SOT143, and SC70s are available in tape-and-reel
only, 2500 piece minimum order quantity.
GND
GND
Note: Insert the desired number from the Selector Guide into
the blank to complete the part number. Also see Selector Guide
for top mark for SOT23
(
) ARE FOR MAX6807
19-1421; Rev 3; 7/14
MAX6806/MAX6807/
MAX6808
Voltage Detectors
Absolute Maximum Ratings
CC
V
to GND ........................................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
A
RESET, RESET to GND
SOT23, SOT143 (derate 4mW/°C above +70°C) ......320mW
(MAX6806/MAX6807) ............................. -0.3V to (V
+ 0.3V)
SC70 (derate 2.17mW/°C above +70vC) ...................174mW
µMAX (derate 4.5mW/°C above +70°C) ....................362mW
SO (derate 5.9mW/°C above +70°C) .........................471mW
Operating Temperature Range .......................... -40°C to +85°C
Storage Temperature Range............................ -65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
CC
RESET to GND (MAX6808)................................-0.3V to + 6.0V
MR to GND (SOT143 package only) ..................-0.3V to + 6.0V
Input Current, V
..........................................................±20mA
CC
Output Current, RESET, RESET .....................................±20mA
Rate of Rise, V .........................................................100V/µs
CC
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 = -40°C to +85°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
TA = 0°C to +70°C
MIN
1.0
TYP
MAX
5.5
UNITS
Supply Voltage Range
Supply Current
VCC
V
TA = -40°C to +85°C
VCC = +3.6V, no load
VCC = +5.5V, no load
1.2
5.5
35
60
ICC
µA
V
50
80
MAX680_ _ _46
MAX680_ _ _32
MAX680_ _ _26
MAX680_ _ _23
4.508
3.136
2.548
2.254
4.60
3.20
2.60
2.30
0.02
4.692
3.264
2.652
2.346
0.03
TA = +25°C
VCC falling
Reset Threshold
VTH-
Reset Threshold Hysteresis
VHYST
VOL
TA = +25°C, Figure 2
V
V
V
TH-
V
TH-
ISINK = 20µA, VCC = 1.0V
ISINK = 1.0mA, VCC = 2.0V
0.3
0.4
RESET Output Voltage
(MAX6806/MAX6808)
ISOURCE = 2.0mA, VCC = 5.0V
(MAX6806 only)
VOH
IOH
0.8 VCC
VCC = 5.5V, RESET deasserted
(MAX6808 only)
RESET Output Leakage Current
1
µA
V
ISOURCE = 20µA, VCC = 1.2V
ISOURCE = 400µA, VCC = 2.0V
ISINK = 3.2mA, VCC = 5.0V
VCC falling at 1mV/µs
0.8 VCC
0.8 VCC
VOH
VOL
RESET Output Voltage
(MAX6807)
0.4
VCC to Reset Delay (Note 2)
Reset Threshold Tempco
MR Pulldown Resistance
30
30
80
µs
ppm/°C
kW
RMR
40
120
0.6
V
IL
> V
TH+
MR Input Threshold
VCC
V
V
IH
0.7 VCC
Note1: All devices are 100% production tested at T = +25°C, and are guaranteed by design for T = T
to T
, as specified.
MAX
A
A
MIN
Note 2: RESET output for MAX6806/MAX6808, RESET output for MAX6807.
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MAX6806/MAX6807/
MAX6808
Voltage Detectors
Typical Operating Characteristics
(T = +25°C, unless otherwise noted.)
A
SUPPLY CURRENT
vs. TEMPERATURE
POWER-DOWN RESET DELAY
vs. TEMPERATURE
50
45
40
35
30
25
20
15
10
5
45
43
41
39
37
35
33
V
V
= V - V = 100mV
TH- CC
FALLING AT 1mV/µS
OD
CC
V
= 5.0V
CC
V
= 3.3V
= 1.8V
CC
V
CC
31
29
27
25
V
= 1.0V
120
CC
90
0
-60 -45 -30-15 0 15 30 45 60 75 90 105120135
TEMPERATURE (°C)
-60
-30
0
30
60
TEMPERATURE (°C)
POWER-UP RESET DELAY
vs. TEMPERATURE
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
12
11
10
9
1.0100
1.0080
1.0060
1.0040
1.0020
1.0000
0.9980
0.9960
0.9940
0.9920
0.9900
V
OD
= V - V +
CC TH
V
CC
RISING (V
)
TH+
V
OD
= 50mV
8
7
6
5
4
V
OD
= 100mV
V
CC
FALLING (V
)
TH-
V
= 200mV
0
OD
-60
-30
30
60
90
120
-40 -30 -15
0
15 30 45 60 75 85
TEMPERATURE (°C)
TEMPERATURE (°C)
Pin Description
PIN
NAME
FUNCTION
SOT23/SC70 SOT143 µMAX/SO
Active-Low Reset Output (MAX6806/MAX6808). RESET remains low
while V is below the reset-threshold voltage or while MR is held high.
RESET
CC
1
1
1
Active-High Reset Output (MAX6807). RESET remains high while V
is below the reset-threshold voltage or while MR is held high.
CC
RESET
GND
2
3
4
3
4
2
Ground
V
CC
Supply Voltage Input
—
—
2
—
MR
Active-High Manual Reset Input. Internal 80kW resistor to GND.
Not Internally Connected
—
3,5–8
N.C.
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MAX6806/MAX6807/
MAX6808
Voltage Detectors
Manual-Reset Input
Detailed Description
Many applications require manual-reset capabilities,
allowing an operator, a test technician, or external logic
circuitry to initiate a reset. A logic high on MR asserts
a reset and remains asserted while MR is high. This
input has an 80kW pulldown resistor, so the input can be
left unconnected if not used. Connect a normally open
Reset Output
The MAX6806 voltage detector features an active-low,
push-pull RESET output, while the MAX6807 features an
active-high, push-pull RESET output. Unlike micropro-
cessor (µP) supervisory circuits that offer a reset timeout
period, the MAX6806 and MAX6807 RESET goes high
and RESET goes low virtually immediately once V
exceeds the reset threshold. If a brownout occurs (V
falls below the reset threshold), RESET goes low and
RESET goes high. RESET is guaranteed to be a logic
momentary switch from MR to V
to create a manu-
CC
CC
CC
al-reset function. If MR is driven from long cables or if the
device is used in a noisy environment, connecting a 0.1µF
capacitor from MR to ground provides noise immunity.
low for V
high for V
≥ 1V and RESET is guaranteed to be a logic
≥ 1.2V.
Hysteresis
CC
CC
The MAX6806/MAX6807/MAX6808 feature internal
hysteresis that creates two trip points: one for the rising
supply voltage and one for the falling supply voltage
(Figure 2). The hysteresis prevents the output from
The MAX6808 features an active-low, open-drain RESET
output. The output sinks current when V falls below
CC
the reset threshold. Connect a pullup resistor from
RESET to any supply voltage up to 6V (Figure 1). Select
a resistor value large enough to provide a logic low and
small enough to provide a logic high while supplying all
input and leakage currents connected to the RESET
line. A 100kW resistor is sufficient in applications driving
high-impedance loads.
oscillating (chattering) when V
threshold.
is near the reset
CC
Reset Threshold Accuracy
The MAX6806/MAX6807/MAX6808 are ideal for
sys-tems using a 5V ±5%, 3V ±5%, or 2.5V ±5% power
supply with ICs specified for 5V ±10%, 3V ±10%, or
2.5V ±10%, respectively. The reset is guaranteed to
assert after the power supply falls out of regulation,
but before power drops below the minimum specified
oper-ating voltage range for the system ICs.
The manual reset input (MR, 4-pin SOT143 package) can
also initiate a reset (see Manual Reset Input section).
+3.3V
+5.0V
V
TH+
V
= V
- V
TH+ TH-
HYST
HYST
V
TH-
V
CC
V
CC
V
OH
100kΩ
5V SYSTEM
MAX6808
RESET
(MAX6806/MAX6808)
V
V
RESET
OL
OH
GND
GND
RESET
(MAX6807)
V
OL
Figure 1. The MAX6808 Open-Drain RESET Output Allows Use
with Multiple Supplies
Figure 2. Input and Output Waveforms with V
Varied
CC
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MAX6806/MAX6807/
MAX6808
Voltage Detectors
Ensuring a Valid Reset Output Down to
= Ground
Applications Information
V
CC
When V
Negative-Going V
Transients
CC
falls below 1V, the MAX6806/MAX6808
CC
In addition to asserting a reset signal during power-up,
power-down, and brown-out conditions, the MAX6806/
MAX6807/MAX6808 are immune to short-duration, neg-
RESET output no longer sinks current—it becomes
an open circuit. Therefore, high-impedance CMOS
logic inputs connected to RESET can drift to
undetermined voltages. This presents no problem in most
applications, since most circuitry is inoperative when
ative-going V
transients.
CC
Figure 3 displays typical transient durations vs. reset-com-
parator overdrive for which the MAX6806/MAX6807/
MAX6808 do not generate a reset pulse. The graph was
V
is below 1V. In applications where RESET must
CC
be valid down to ground, add a pulldown resistor to
RESET so any stray leakage currents flow to ground,
holding RESET low (Figure 4). Select R1 to be large
enough not to load RESET and small enough to pull
RESET to ground. For most applications, 100kW will not
load RESET and will pull RESET to ground. Similarly,
if RESET (MAX6807) must be valid below 1.2V, add a
pullup resistor to RESET.
generated using a negative-going pulse applied to V
,
CC
starting 0.5V above the actual reset threshold and ending
below it by the magnitude indicated (reset-comparator
overdrive). The graph indicates the maximum pulse width
a negative-going V
transient can have without causing
CC
a reset pulse. As the magnitude of the transient increases
(goes further below the reset threshold), the maximum
allowable pulse width decreases. A 0.1µF capacitor
mounted as close as possible to V
transient immunity.
provides additional
CC
80
T
= +25°C
A
V
CC
70
V
CC
60
50
40
30
R1
100kΩ
MAX6806
MAX6807
MAX680
46
RESET
RESET
R1
100kΩ
20
GND
GND
10
100
1000
RESET COMPARATOR OVERDRIVE, V - V (mV)
TH-
CC
Figure 3. Maximum Transient Duration without Causing a Reset
Pulse vs. Reset Comparator Overdrive
Figure 4. RESET / RESET Valid to V
= Ground Circuit
CC
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MAX6806/MAX6807/
MAX6808
Voltage Detectors
Interfacing to µPs with Bidirectional
Reset Pins
µPs with bidirectional reset pins (such as the Motorola
68HC11 series) can contend with push-pull RESET
outputs, resulting in indeterminate logic levels. Use the
MAX6808 with the open-drain RESET when interfacing
to this type of controller.
V
CC
V
V
CC
CC
4.7kΩ
µP
MAX6808
RESET
RESET
GND
GND
Figure 5. Interfacing to μPs with Bidirectional Reset I/O
Selector Guide
PART
MAX6806SA46
MAX6806SA26
MAX6806SA23
MAX6806UA46
MAX6806UA26
MAX6806UA23
MAX6806UR46-T
MAX6806UR26-T
MAX6806UR23-T
MAX6806US46-T
MAX6806US26-T
MAX6806US23-T
MAX6806XR46-T
MAX6806XR26-T
MAX6806XR23-T
RESET OUTPUT
TOP MARK
—
NOMINAL VTH- (V)†
4.6
2.6
2.3
4.6
2.6
2.3
4.6
2.6
2.3
4.6
2.6
2.3
4.6
2.6
2.3
—
—
—
—
—
FZDP
FZDQ
FZDR
KABT
KABU
KABV
AAA
AAB
AAC
Active-Low, Push-Pull
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MAX6806/MAX6807/
MAX6808
Voltage Detectors
Selector Guide (continued)
PART
MAX6807SA46
MAX6807SA26
MAX6807UA46
MAX6807UA26
MAX6807UR46-T
MAX6807UR26-T
MAX6807US46-T
MAX6807US26-T
MAX6807XR46-T
MAX6807XR26-T
MAX6808SA46
MAX6808SA32
MAX6808SA26
MAX6808UA46
MAX6808UA32
MAX6808UA26
MAX6808UR46-T
MAX6808UR32-T
MAX6808UR26-T
MAX6808US46-T
MAX6808US32-T
MAX6808US26-T
MAX6808XR46-T
MAX6808XR32-T
MAX6808XR26-T
RESET OUTPUT
TOP MARK
—
NOMINAL VTH- (V) †
4.6
2.6
4.6
2.6
4.6
2.6
4.6
2.6
4.6
2.6
4.6
3.2
2.6
4.6
3.2
2.6
4.6
3.2
2.6
4.6
3.2
2.6
4.6
3.2
2.6
—
—
—
FZDS
FZDT
KABW
KABX
AAD
AAE
—
Active-High, Push-Pull
—
—
—
—
—
FZDU
FZFL
FZDV
KABY
KACC
KABZ
AAF
ACD
AAG
Active-Low, Open-Drain
Other voltage thresholds may be available. Contact factory for availability.
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MAX6806/MAX6807/
MAX6808
Voltage Detectors
Pin Configurations
TOP VIEW
(RESET)/RESET
1
2
N.C.
(RESET)/RESET
1
2
3
4
8
7
6
5
GND
4
(RESET)/RESET
1
MAX6806
MAX6807
MAX6808
3
V
CC
MAX6806
MAX6807
MAX6808
MAX6806
MAX6807
MAX6808
V
N.C.
N.C.
N.C.
CC
GND
N.C.
SOT23/SC70
MR
2
3
V
CC
GND
( ) ARE FOR MAX6807
SOT143
µMAX/SO
Package Information
Chip Information
TRANSISTOR COUNT: 72
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE OUTLINE
LAND
PATTERN NO.
CODE
NO.
3 SC70
3 SOT23
4 SOT143
8 SO
X3-2
U3-1
U4-1
—
21-0075
21-0051
21-0052
21-0041
21-0036
90-0208
90-0179
90-0183
—
—
—
8 μMAX
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MAX6806/MAX6807/
MAX6808
Voltage Detectors
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
DESCRIPTION
No /V OPNs; removed Automotive reference from Applications section;
updated Package Information
3
7/14
1, 9–13
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2014 Maxim Integrated Products, Inc.
│ 9
相关型号：
MAX6808US26+T
Power Supply Support Circuit, Fixed, 1 Channel, +2.6VV, CMOS, PDSO4, SOT-143, 4 PIN
MAXIM
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