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MAX6802 데이터시트 PDF




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부품번호 MAX6802 기능
기능 Low-Power uP Reset Circuits
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MAX6802 데이터시트, 핀배열, 회로
19-1933; Rev 4; 3/12
3-Pin, Low-Power
µP Reset Circuits
General Description
The MAX6800/MAX6801/MAX6802 microprocessor (µP)
supervisory circuits monitor the power supplies in 2.85V
to 5.0V µP and digital systems. They increase circuit
reliability and reduce cost by eliminating external com-
ponents and adjustments.
These devices perform a single function—they assert a
reset signal whenever the V CC supply voltage declines
below a preset threshold, keeping it asserted for a preset
timeout period after V CC has risen above the reset
threshold. The only difference among the three devices
is their output. The MAX6801 (push/pull) and MAX6802
(open-drain) have an active-low RESET output, while the
MAX6800 (push/pull) has an active-high RESET output.
The MAX6800/MAX6801 are guaranteed to be in the cor-
rect state for VCC down to 0.7V. The MAX6802 is guaran-
teed to be in the correct state for VCC down to 1.0V.
The reset comparator in these ICs is designed to ignore
fast transients on V CC. Reset thresholds are factory-
trimmable between 2.63V and 4.80V, in approximately
100mV increments. These devices are available with a
1ms (min), 20ms (min), or 100ms (min) reset pulse
width. Ideal for space-critical applications, the
MAX6800/MAX6801/MAX6802 come packaged in a 3-
pin SOT23. For a lower threshold voltage version, see
the MAX6332/MAX6333/MAX6334.
Applications
Computers
Controllers
Intelligent Instruments
Critical µP/µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
Typical Operating Circuit and Pin Configuration appear
at end of data sheet.
Selector Guide appears at end of data sheet.
Features
o Ultra-Low 0.7V Operating Supply Voltage
o Low 4.0µA Supply Current
o Precision Monitoring of 2.85V to 5.0V Power-
Supply Voltages
o Reset Thresholds Available from 2.63V to 4.80V,
in Approximately 100mV Increments
o Fully Specified over Temperature
o Three Power-On Reset Timeout Periods Available
(1ms min, 20ms min, 100ms min)
o Low Cost
o Three Available Output Structures: Push/Pull
RESET, Push/Pull RESET, Open-Drain RESET
o Guaranteed RESET/RESET Valid to VCC = 0.7V
(MAX6800/MAX6801)
o Power-Supply Transient Immunity
o No External Components Required
o 3-Pin SOT23 Package
o Pin Compatible with MAX809/MAX810,
MAX6326/MAX6327/MAX6328, and
MAX6346/MAX6347/MAX6348
Ordering Information
PART
MAX6800UR_ _D_-T
MAX6800UR_ _D_/V-T
MAX6801UR_ _D_-T
MAX6801UR_ _ D_/V-T
MAX6802UR_ _D_-T
MAX6802UR_ _ D_/V-T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
3 SOT23
3 SOT23
3 SOT23
3 SOT23
3 SOT23
3 SOT23
*These devices are available in factory-set V CC reset thresh-
olds from 2.63V to 4.80V, in approximately 0.1V increments.
Choose the desired reset threshold suffix from Table 1 and
insert it in the blanks following “UR” in the part number.
Factory-programmed reset timeout periods are also available.
Insert the number corresponding to the desired nominal reset
timeout period (1 = 1ms min, 2 = 20ms min, 3 = 100ms min) in
the blank following “D” in the part number. There are 15 stan-
dard versions with a required order increment of 2500 pieces.
Sample stock is generally held on the standard versions only
(see Selector Guide). Contact the factory for availability of non-
standard versions (required order increment is 10,000 pieces).
All devices available in tape-and-reel only.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
/V Denotes an automotive-qualified part.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
http://www.Datasheet4U.com/




MAX6802 pdf, 반도체, 판매, 대치품
3-Pin, Low-Power
µP Reset Circuits
Applications Information
Interfacing to µPs with Bidirectional
Reset Pins
Since the RESET output on the MAX6802 is open-drain,
this device interfaces easily with µPs that have bidirec-
tional reset pins, such as the Motorola 68HC11.
Connecting the µP supervisor’s RESET output directly
to the microcontroller’s (µC’s) RESET pin with a single
pullup resistor allows either device to assert reset
(Figure 1).
Negative-Going VCC Transients
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these devices are
relatively immune to short-duration, negative-going V CC
transients (glitches). The Typical Operating Characteristics
show the Maximum Transient Duration vs. Reset
Comparator Overdrive graph. The graph shows the maxi-
mum pulse width that a negative-going VCC transient may
typically have without issuing a reset signal. As the ampli-
tude of the transient increases, the maximum allowable
pulse width decreases.
VCC
VCC
MAX6802
RESET
GND
VCC
100k
µP
MOTOROLA
68HCXX
RESET
GND
Figure 1. Interfacing to µPs with Bidirectional Reset Pins
Pin Configuration
VCC VCC
MAX6801
RESET
GND
(a)
100k
MAX6800
RESET
GND
(b)
*ASSUMES HIGH-Z RESET INPUT TO THE µP
Figure 2. Ensuring Reset Valid Down to VCC = 0V
100k*
Typical Operating Circuit
TOP VIEW
GND 1
MAX6800
MAX6801
MAX6802
3 VCC
VCC
VCC
MAX6801
RESET
VCC
µP
RESET
RESET (RESET) 2
( ) ARE FOR MAX6800
SOT23-3
GND GND
4 _______________________________________________________________________________________
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MAX6802 전자부품, 판매, 대치품
3-Pin, Low-Power
µP Reset Circuits
REVISION
NUMBER
3
4
REVISION
DATE
10/11
3/12
DESCRIPTION
Added automotive-qualified part information to Ordering Information.
Updated Factory-Trimmed Reset Thresholds table.
Revision History
PAGES
CHANGED
1
5
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circu
it patent licenses are
implied. Maxim 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.
7 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2012 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
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