MAX6807UA26+ [MAXIM]
Power Supply Support Circuit, Fixed, 1 Channel, PDSO8, MICRO MAX PACKAGE-8;
| 型号： | MAX6807UA26+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PDSO8, MICRO MAX PACKAGE-8 光电二极管 |
| 文件： | 总13页 (文件大小：248K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1421; Rev 2; 4/01
Voltage Detectors
General Description
Features
The MAX6806/MAX6807/MAX6808 precision voltage
detectors are ideal for accurate monitoring of power
supplies in digital systems. They provide circuit reliabili-
ty and reduce total cost by eliminating external compo-
nents and adjustments.
ꢀ Preset Reset Thresholds: 4.6V and 2.6V
(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
preset, ±±2 accurate threshold. ꢀnternal hysteresis
ensures stable switching. The MAX6806/MAX6807/
MAX6808 are available in 4.6V and ±.6V thresholds (±.3V
is also available for the MAX6806 only). The MAX6806 fea-
tures 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-drain RESET out-
ꢀ Immune to Power-Supply Transients
ꢀ RESET Valid to V
= 1.0V (MAX6806/MAX6808)
CC
ꢀ 35µA Supply Current
ꢀ No External Components
ꢀ Manual Reset Available with 4-Pin SOT143
put. RESET is valid for V
down to 1V (MAX6806/
CC
Package
MAX6808), and RESET (MAX6807) is guaranteed for V
CC
down to 1.±V.
ꢀ Miniature 3-Pin SC70, 3-Pin SOT23, and 4-Pin
The MAX6806/MAX6807/MAX6808 are available in
3-pin SC70, 3-pin SOT±3, 8-pin µMAX, 8-pin SO, and 4-
pin SOT143 packages. The SOT143 package includes
a manual-reset input.
SOT143 Packages
ꢀ 8 Lead µMAX and 8 Lead SO Packages are Pin
Compatible with the MC33064/MC33164/
MC34064/MC34164
Applications
Automotive
Computers
Ordering Information
Controllers
Bar-Code Scanners
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
ꢀntelligent ꢀnstruments
MAX6806XR_ _ -T
MAX6806UR_ _ -T
MAX6806US_ _ -T
MAX6806UA_ _
MAX6806SA_ _
MAX6807XR_ _ -T
MAX6807UR_ _ -T
MAX6807US_ _ -T
MAX6807UA_ _
MAX6807SA_ _
MAX6808XR_ _ -T
MAX6808UR_ _ -T
MAX6808US_ _ -T
MAX6808UA_ _
MAX6808SA_ _
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
3 SOT±3
4 SOT143
8 µMAX
8 SO
Selector Guide and Pin Configurations appear at end of data
sheet.
Typical Operating Circuit
3 SC70
3 SOT±3
4 SOT143
8 µMAX
8 SO
V
CC
V
CC
V
CC
3 SC70
MAX6806
MAX6807
MAX6808
µP
3 SOT±3
4 SOT143
8 µMAX
8 SO
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
________________________________________________________________ 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.
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
(MAX6806/MAX6807) ................................-0.3V to (V
RESET to GND (MAX6808)...................................-0.3V to + 6.0V
MR to GND (SOT143 package only)....................-0.3V to + 6.0V
SOT±3, SOT143 (derate 4mW/°C above +70°C) .........3±0mW
SC70 (derate ±.17mW/°C above +70°C) .....................174mW
µMAX (derate 4.5mW/°C above +70°C) ......................36±mW
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
+ 0.3V)
CC
ꢀnput Current, V
...........................................................±±0mA
CC
Output Current, RESET, RESET .......................................±±0mA
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 = +±5°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
= 0°C to +70°C
MIN
1.0
TYP
MAX
5.5
UNITS
T
T
A
Supply Voltage Range
Supply Current
V
CC
V
= -40°C to +85°C
1.±
5.5
A
V
= +3.6V, no load
= +5.5V, no load
35
60
CC
CC
ꢀ
µA
V
CC
V
50
80
MAX680_ _ _46
MAX680_ _ _3±
MAX680_ _ _±6
MAX680_ _ _±3
4.508
3.136
±.548
±.±54
4.60
3.±0
±.60
±.30
4.69±
3.±64
±.65±
±.346
T
A
= +±5°C,
Reset Threshold
V
TH-
V
falling
CC
0.0±
0.03
Reset Threshold Hysteresis
V
HYST
T
A
= +±5°C, Figure ±
V
V
TH-
V
TH-
ꢀ
ꢀ
= ±0µA, V
= 1.0V
0.3
0.4
SꢀNK
CC
V
OL
= 1.0mA, V
= ±.0V
SꢀNK
CC
RESET Output Voltage
(MAX6806/MAX6808)
V
ꢀ
= ±.0mA, V
= 5.0V
SOURCE
CC
V
ꢀ
0.8V
OH
CC
(MAX6806 only)
V
= 5.5V, RESET deasserted
CC
1
µA
V
RESET Output Leakage Current
OH
(MAX6808 only)
ꢀ
ꢀ
ꢀ
= ±0µA, V
= 1.±V
0.8V
0.8V
SOURCE
CC
CC
CC
V
OH
RESET Output Voltage
(MAX6807)
= 400µA, V
CC
= ±.0V
SOURCE
CC
V
OL
= 3.±mA, V
SꢀNK
= 5.0V
0.4
V
to Reset Delay (Note ±)
V
falling at 1mV/µs
30
µs
ppm/°C
kΩ
CC
CC
Reset Threshold Tempco
MR Pull-Down Resistance
30
80
R
40
0.7V
1±0
0.6
MR
V
ꢀL
MR ꢀnput Threshold
V
CC
> V
V
TH+
V
ꢀH
CC
Note1: All devices are 1002 production tested at T = +±5°C, and are guaranteed by design for T = T
to T
, as specified.
MAX
A
A
MꢀN
Note 2: RESET output for MAX6806/MAX6808, RESET output for MAX6807.
2
_______________________________________________________________________________________
Voltage Detectors
Typical Operating Characteristics
(T = +±5°C, unless otherwise noted.)
A
POWER-DOWN RESET DELAY
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
50
45
40
35
30
25
20
15
10
5
45
V
OD
V
CC
= V - V = 100mV
TH- CC
FALLING AT 1mV/µS
43
41
39
37
35
33
31
29
27
25
V
CC
= 5.0V
V
= 3.3V
= 1.8V
CC
V
CC
V
= 1.0V
120
CC
0
-60 -45 -30-15 0 15 30 45 60 75 90 105 120135
-60 -30
0
30
60
90
TEMPERATURE (°C)
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
POWER-UP RESET DELAY 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
= 50mV
OD
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
SOT143 µMAX/SO
NAME
FUNCTION
SOT23/SC70
Active-Low Reset Output (MAX6806/MAX6808). RESET remains low while V
is below the reset-threshold voltage or while MR is held high.
CC
RESET
1
1
1
Active-High Reset Output (MAX6807). RESET remains high while V
the reset-threshold voltage or while MR is held high.
is below
CC
RESET
GND
±
3
4
3
4
±
Ground
V
CC
Supply Voltage ꢀnput
—
—
±
—
MR
Active-High Manual Reset ꢀnput. ꢀnternal 80kΩ resistor to GND.
Not ꢀnternally Connected
—
3, 5–8
N.C.
_______________________________________________________________________________________
3
Voltage Detectors
Manual Reset Input
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 80kΩ pull-down resistor, so the input may be left
unconnected if not used. Connect a normally open
_______________Detailed Description
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 micro-
processor (µP) supervisory circuits that offer a reset
timeout period, the MAX6806 and MAX6807 RESET
goes high and RESET goes low virtually immediately
momentary switch from MR to V
to create a manual-
CC
reset function. ꢀf 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.
once V
exceeds the reset threshold. ꢀf a brownout
CC
CC
occurs (V
falls below the reset threshold), RESET
goes low and RESET goes high. RESET is guaranteed
to be a logic low for V ≥ 1V and RESET is guaran-
CC
Hysteresis
The MAX6806/MAX6807/MAX6808 feature internal hys-
teresis that creates two trip points: one for the rising
supply voltage and one for the falling supply voltage
(Figure ±). The hysteresis prevents the output from oscil-
teed to be a logic high for V
≥ 1.±V.
CC
The MAX6808 features an active-low, open-drain RESET
output. The output sinks current when V falls below
CC
the reset threshold. Connect a pull-up 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 100kΩ resistor is sufficient in applications driving
high-impedance loads.
lating (chattering) when V
is near the reset threshold.
CC
Reset Threshold Accuracy
The MAX6806/MAX6807/MAX6808 are ideal for sys-
tems using a 5V ±52, 3V ±52, or ±.5V ±52 power
supply with ꢀCs specified for 5V ±102, 3V ±102, or
±.5V ±102, 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 ꢀCs.
The manual reset input (MR, 4-pin SOT143 package)
can also initiate a reset (see Manual Reset Input sec-
tion).
+3.3V
+5.0V
V
TH+
V
HYST
= V - V
TH+ TH-
HYST
V
TH-
V
CC
V
CC
100kΩ
V
OH
5V SYSTEM
MAX6808
RESET
(MAX6806/MAX6808)
V
V
RESET
OL
OH
GND
GND
RESET
(MAX6807)
V
OL
Figure 2. Input and Output Waveforms with V
Varied
Figure 1. The MAX6808 open-drain RESET output allows use
CC
with multiple supplies.
4
_______________________________________________________________________________________
Voltage Detectors
Ensuring a Valid Reset Output Down to
Applications Information
V
= Ground
CC
Negative-Going V
CC
Transients
When V
falls below 1V, the MAX6806/MAX6808
CC
ꢀn 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 applica-
ative-going V
transients.
CC
tions, since most circuitry is inoperative when V
is
CC
Figure 3 displays typical transient durations vs. reset-
comparator overdrive for which the MAX6806/MAX6807/
MAX6808 do not generate a reset pulse. The graph was
below 1V. ꢀn applications where RESET must be valid
down to ground, add a pull-down 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, 100kΩ will not load
RESET and will pull RESET to ground. Similarly, if
RESET (MAX6807) must be valid below 1.±V, add a
pull-up resistor to RESET.
generated using a negative-going pulse applied to V
,
CC
starting 0.5V above the actual reset threshold and end-
ing below it by the magnitude indicated (reset-compara-
tor overdrive). The graph indicates the maximum pulse
width a negative-going V
transient can have without
CC
causing 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
vides additional transient immunity.
pro-
CC
80
T = +25°C
A
70
V
CC
V
CC
60
50
40
30
R1
100kΩ
MAX6806
MAX6807
MAX680
46
RESET
RESET
R1
100kΩ
20
GND
10
100
1000
GND
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
_______________________________________________________________________________________
5
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 out-
puts, resulting in indeterminate logic levels. Use the
MAX6808 with the open-drain RESET when interfacing
to this type of controller.
V
CC
V
CC
V
CC
4.7kΩ
µP
MAX6808
RESET
RESET
GND
GND
Figure 5. Interfacing to µPs with Bidirectional Reset I/O
Selector Guide
PART
MAX6806SA46
RESET OUTPUT
TOP MARK CODE
NOMINAL V (V)
TH
—
—
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
MAX6806SA26
MAX6806SA23
MAX6806UA46
MAX6806UA26
MAX6806UA23
MAX6806UR46-T
MAX6806UR26-T
MAX6806UR23-T
MAX6806US46-T
MAX6806US26-T
MAX6806US23-T
MAX6806XR46-T
MAX6806XR26-T
MAX6806XR23-T
—
—
—
—
FZDP
FZDQ
FZDR
KABT
KABU
KABV
AAA
AAB
AAC
Active-Low, Push-Pull
6
_______________________________________________________________________________________
Voltage Detectors
Selector Guide (continued)
PART
MAX6807SA46
RESET OUTPUT
TOP MARK CODE
NOMINAL V (V)
TH
—
—
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
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
—
—
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.
_______________________________________________________________________________________
7
Voltage Detectors
Pin Configurations
TOP VIEW
(RESET)/RESET
GND
1
2
N.C.
(RESET)/RESET
1
2
3
4
8
7
6
5
GND
(RESET)/RESET
1
4
MAX6806
MAX6807
MAX6808
3
V
CC
V
CC
N.C.
N.C.
N.C.
MAX6806
MAX6807
MAX6808
MAX6806
MAX6807
MAX6808
N.C.
GND
SOT23/SC70
MR
2
3
V
CC
µMAX/SO
SOT143
( ) ARE FOR MAX6807
___________________Chip Information
TRANSISTOR COUNT: 72
8
_______________________________________________________________________________________
Voltage Detectors
Package Information
_______________________________________________________________________________________
9
Voltage Detectors
Package Information (continued)
10 ______________________________________________________________________________________
Voltage Detectors
Package Information (continued)
______________________________________________________________________________________ 11
Voltage Detectors
Package Information (continued)
12 ______________________________________________________________________________________
Voltage Detectors
Package Information (continued)
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_____________________13
© 2001 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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