MAX6808US23-T [MAXIM]
Analog IC ; 模拟IC\n
| 型号： | MAX6808US23-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Analog IC
|
| 文件： | 总12页 (文件大小：207K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1421; Rev 1; 4/99
Vo lt a g e De t e c t o rs
7/MAX608
Ge n e ra l De s c rip t io n
Fe a t u re s
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. Internal hysteresis
e ns ure s s ta b le s witc hing . The MAX6806/MAX6807/
MAX6808 are available in 4.6V and 2.6V thresholds (2.3V
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
MAX6808), and RESET (MAX6807) is guaranteed for V
Package
CC
down to 1.2V.
♦ Miniature 3-Pin SC70, 3-Pin SOT23, and 4-Pin
The MAX6806/MAX6807/MAX6808 a re a va ila b le in
3-pin SC70, 3-pin SOT23, and 4-pin SOT143 packages.
The SOT143 package includes a manual-reset input.
SOT143 Packages
Ord e rin g In fo rm a t io n
Ap p lic a t io n s
Computers
PART
TEMP. RANGE
PIN-PACKAGE
MAX6806XR_ _-T
MAX6806UR_ _-T
MAX6806US_ _-T
MAX6807XR_ _-T
MAX6807UR_ _-T
MAX6807US_ _-T
MAX6808XR_ _-T
MAX6808UR_ _-T
MAX6808US_ _-T
-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
3 SC70
Controllers
3 SOT23
4 SOT143
3 SC70
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
3 SOT23
4 SOT143
3 SC70
Bar-Code Scanners
3 SOT23
4 SOT143
* All devices available in tape-and-reel only, 2500 piece mini-
mum order quantity.
Typical Operating Circuit and Pin Configurations appear at
end of data sheet.
Note: Insert the desired number from the Selector Guide into the
blank to complete the part number. Also see Selector Guide for
top mark.
S e le c t o r Gu id e
NOMINAL
PART
RESET OUTPUT
TOP MARK
†
V
(V)
TH-
MAX6806UR46-T
MAX6806UR26-T
MAX6806UR23-T
MAX6806US46-T
MAX6806US26-T
MAX6806US23-T
FZDP
FZDQ
FZDR
KABT
KABU
KABV
4.6
2.6
2.3
4.6
2.6
2.3
Active-Low, Push-Pull
† Other reset thresholds may be available. Contact factory for availability.
Selector Guide continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
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Vo lt a g e De t e c t o rs
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND ..........................................................-0.3V to +6.0V
Rate of Rise, V
...........................................................100V/µs
CC
RESET, RESET to GND
(MAX6806/MAX6807) ................................-0.3V to (V + 0.3V)
RESET to GND (MAX6808)...................................-0.3V to + 6.0V
MR to GND (SOT143 package only)....................-0.3V to + 6.0V
Continuous Power Dissipation (T = +70°C)
A
SOT23, SOT143 (derate 4mW/°C above +70°C) .........320mW
SC70 (derate 2.17mW/°C above +70°C) .....................174mW
Operating Temperature Range ..........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10sec) .............................+300°C
CC
Input Current, V
...........................................................±20mA
CC
Output Current, RESET, RESET .......................................±20mA
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
= 0°C to +70°C
MIN
1.0
TYP
MAX
5.5
UNITS
T
A
Supply Voltage Range
Supply Current
V
CC
V
T
A
= -40°C to +85°C
1.2
5.5
V
= +3.6V, no load
= +5.5V, no load
35
60
CC
I
CC
µA
V
V
50
80
CC
MAX680_ _ _46
MAX680_ _ _26
MAX680_ _ _23
4.508
2.548
2.254
4.60
2.60
2.30
4.692
2.652
2.346
T
= +25°C,
A
Reset Threshold
V
TH-
V
falling
CC
0.02
V
TH-
0.03
V
TH-
Reset Threshold Hysteresis
V
HYST
T
A
= +25°C, Figure 2
V
7/MAX608
I
= 20µA, V = 1.0V
0.3
0.4
SINK
CC
V
OL
I
= 1.0mA, V = 2.0V
CC
SINK
RESET Output Voltage
(MAX6806/MAX6808)
V
I
= 2.0mA, V = 5.0V
CC
SOURCE
V
OH
0.8V
CC
(MAX6806 only)
V
= 5.5V, RESET deasserted
CC
I
µA
V
RESET Output Leakage Current
OH
(MAX6808 only)
I
= 20µA, V = 1.2V
0.8V
CC
SOURCE
CC
V
OH
RESET Output Voltage
(MAX6807)
I
= 400µA, V = 2.0V
0.8V
CC
SOURCE
CC
V
I
= 3.2mA, V = 5.0V
0.4
OL
SINK CC
V
to Reset Delay (Note 2)
V
falling at 1mV/µs
30
µs
ppm/°C
kΩ
CC
CC
Reset Threshold Tempco
MR Pull-Down Resistance
30
80
R
40
120
0.6
MR
V
IL
MR Input Threshold
V
CC
> V
V
TH+
V
0.7V
CC
IH
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.
2
_______________________________________________________________________________________
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Vo lt a g e De t e c t o rs
7/MAX608
Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(T = +25°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
V
CC
= V - V = 100mV
CC
FALLING AT 1mV/µS
OD TH-
43
41
39
37
35
33
31
29
27
25
V
= 5.0V
CC
V
CC
= 3.3V
= 1.8V
V
CC
V
CC
= 1.0V
120
0
-60 -45 -30-15 0 15 30 45 60 75 90 105 120135
TEMPERATURE (°C)
-60 -30
0
30
60
90
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
= V - V +
OD 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)
P in De s c rip t io n
PIN
NAME
FUNCTION
SOT23/SC70
SOT143
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
Active-High Reset Output (MAX6807). RESET remains high while V is
CC
below the reset-threshold voltage or while MR is held high.
RESET
GND
2
3
4
3
2
Ground
V
CC
Supply Voltage Input
—
MR
Active-High Manual Reset Input. Internal 80kΩ resistor to GND.
_______________________________________________________________________________________
3
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Vo lt a g e De t e c t o rs
Ma n u a l Re s e t In p u t
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
_______________De t a ile d De s c rip t io n
Re s e t Ou t p u t
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. 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.
once V
exceeds the reset threshold. If a brownout
CC
occurs (V
falls below the reset threshold), RESET
CC
goes low and RESET goes high. RESET is guaranteed
to be a logic low for V ≥ 1V and RESET is guaran-
CC
Hys t e re s is
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 2). The hysteresis prevents the output from oscil-
teed to be a logic high for V
≥ 1.2V.
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
Re s e t Th re s h o ld Ac c u ra c y
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 sec-
tion).
7/MAX608
+3.3V
+5.0V
V
TH+
V
= V - V
HYST
HYST TH+ TH-
V
TH-
V
CC
V
CC
100k
V
OH
5V SYSTEM
MAX6808
RESET
(MAX6806/MAX6808)
V
OL
RESET
V
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
_______________________________________________________________________________________
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Vo lt a g e De t e c t o rs
7/MAX608
En s u rin g a Va lid Re s e t Ou t p u t Do w n t o
Ap p lic a t io n s In fo rm a t io n
V
= Gro u n d
CC
fa lls b e low 1V, the MAX6806/MAX6808
Ne g a t ive -Go in g V
Tra n s ie n t s
CC
Whe n V
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 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. In 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 loa d RESET a nd s ma ll e noug h to p ull RESET to
ground. For most applications, 100kΩ will not load
RESET a nd will p ull RESET to g round . Simila rly, if
RESET (MAX6807) must be valid below 1.2V, 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
pro-
CC
vides additional transient immunity.
80
T = +25°C
A
70
V
CC
V
CC
60
50
40
30
R1
100k
MAX6806
MAX6807
MAX680 46
RESET
RESET
R1
100k
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
_______________________________________________________________________________________
5
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Vo lt a g e De t e c t o rs
In t e rfa c in g t o µP s w it h
Bid ire c t io n a l Re s e t P in s
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
4.7k
µP
MAX6808
RESET
RESET
GND
GND
Figure 5. Interfacing to µPs with Bidirectional Reset I/O
7/MAX608
S e le c t o r Gu id e (c o n t in u e d )
NOMINAL
PART*
RESET OUTPUT
TOP MARK
†
V
(V)
TH-
MAX6806XR46-T
MAX6806XR26-T
MAX6806XR23-T
MAX6807UR46-T
MAX6807UR26-T
MAX6807US46-T
MAX6807US26-T
MAX6807XR46-T
MAX6807XR26-T
MAX6808UR46-T
MAX6808UR26-T
MAX6808US46-T
MAX6808US26-T
MAX6808XR46-T
MAX6808XR26-T
AAA
AAB
4.6
Active-Low, Push-Pull
2.6
2.3
4.6
2.6
4.6
2.6
4.6
2.6
4.6
2.6
4.6
2.6
4.6
2.6
AAC
FZDS
FZDT
KABW
KABX
AAD
Active-High, Push-Pull
AAE
FZDU
FZDV
KABY
KABZ
AAF
Active-Low, Open-Drain
AAG
† Other reset thresholds may be available. Contact factory for availability.
6
_______________________________________________________________________________________
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Vo lt a g e De t e c t o rs
7/MAX608
P in Co n fig u ra t io n s
TOP VIEW
GND
(RESET)/RESET
1
4
(RESET)/RESET
1
2
MAX6806
MAX6807
MAX6808
MAX6806
MAX6807
MAX6808
3
V
CC
GND
MR
2
3
V
CC
SOT23/SC70
SOT143
( ) ARE FOR MAX6807
Typ ic a l Op e ra t in g Circ u it
V
CC
V
CC
V
CC
MAX6806
MAX6807
MAX6808
µP
RESET
INPUT
(RESET)/RESET
GND
GND
( ) ARE FOR MAX6807
___________________Ch ip In fo rm a t io n
TRANSISTOR COUNT: 72
_______________________________________________________________________________________
7
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Vo lt a g e De t e c t o rs
P a c k a g e In fo rm a t io n
7/MAX608
8
_______________________________________________________________________________________
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Vo lt a g e De t e c t o rs
7/MAX608
P a c k a g e In fo rm a t io n (c o n t in u e d )
_______________________________________________________________________________________
9
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Vo lt a g e De t e c t o rs
P a c k a g e In fo rm a t io n (c o n t in u e d )
7/MAX608
10 ______________________________________________________________________________________
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Vo lt a g e De t e c t o rs
7/MAX608
NOTES
______________________________________________________________________________________ 11
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Vo lt a g e De t e c t o rs
NOTES
7/MAX608
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 ____________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 4 0 8 -7 3 7 -7 6 0 0
© 1999 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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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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