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부품번호 | MAX6309 기능 |
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기능 | Programmable Reset ICs | ||
제조업체 | Maxim Integrated | ||
로고 | |||
전체 11 페이지수
19-1145; Rev 6; 7/12
5-Pin, Multiple-Input,
Programmable Reset ICs
General Description
Features
The MAX6305–MAX6313 CMOS microprocessor (µP)
supervisory circuits are designed to monitor more than
one power supply. Ideal for monitoring both 5V and
3.3V in personal computer systems, these devices
assert a system reset if any of the monitored supplies
falls outside the programmed threshold. Low supply
current (15µA) and a small package suit them for
portable applications. The MAX6305–MAX6313 are
specifically designed to ignore fast transients on
any monitored supply.
These devices are available in a SOT23-5 package,
have factory-programmed reset thresholds from 2.5V to
5.0V (in 100mV increments), and feature four power-on
reset timeout periods. Ten standard versions are avail-
able. Contact the factory for availability of non standard
versions.
Applications
o Small 5-Pin SOT23 Package
o Precision Factory-Set VCC Reset Thresholds;
Available in 0.1V Increments from 2.5V to 5V
o Immune to Short VCC Transients
o Guaranteed RESET Valid to VCC = 1V
o Guaranteed Over Temperature
o 8µA Supply Current
o Factory-Set Reset Timeout Delay from
1ms (min) to 1120ms (min)
o No External Components
o Manual Reset Input
o Under/Overvoltage Supply Monitoring
Ordering Information
PART†
TEMP RANGE
PIN-
PACKAGE
Portable Computers
MAX6305UK00D_-T
-0°C to +70°C 5 SOT23
Computers
MAX6305EUK00D_-T
-40°C to +85°C 5 SOT23
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
Multivoltage Systems: 3V/5V, 5V/12V, 5V/24V
Embedded Control Systems
Pin Configurations and Typical Operating Circuit appear at
end of data sheet.
Ordering Information continued at end of data sheet.
Standard Versions Table appears at end of data sheet.
† The MAX6306/MAX6307/MAX6309/MAX6310/MAX6312/
MAX6313 are available with factory-set VCC reset thresholds from
2.5V to 5V, in 0.1V increments. Insert the desired nominal reset
threshold (from Table 1) into the blanks following the letters UK.
All parts also offer factory-programmed reset timeout periods.
Insert the number corresponding to the desired nominal timeout
period index following the “D” in the part number (D1 = 1ms min,
D2 = 20ms min, D3 = 140ms min, and D4 = 1120ms min). There
are 10 standard versions with a required order increment of 2,500
pieces. Sample stock is generally held on the standard versions
only (see Standard Versions table). Required order increment is
10,000 pieces for non-standard versions. Contact factory for
availability of non-standard versions. 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.
_______________________________________________________________Selector Table
PART
MAX6305
MAX6306
MAX6307
MAX6308
MAX6309
MAX6310
MAX6311
MAX6312
MAX6313
OPEN-DRAIN
RESET
OUTPUT
—
—
—
—
—
—
PUSH/PULL
RESET
OUTPUT
—
—
—
—
—
—
PUSH/PULL
RESET
OUTPUT
—
—
—
—
—
—
FACTORY-
SET RESET
THRESHOLD
ON VCC
—
—
—
ADDITIONAL
UNDERVOLTAGE
RESET INPUTS
2
1
1
2
1
1
2
1
1
NEGATIVE/
OVERVOLTAGE
RESET INPUT
—
—
—
—
—
—
MANUAL-
RESET
INPUT
—
—
—
—
—
—
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.
1
5-Pin, Multiple-Input,
Programmable Reset ICs
__________________________________________Typical Operating Characteristics
(VCC = +5V, TA = +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. TEMPERATURE
9.5
9.0 VCC = 5.5V
8.5 VCC = 4.5V
8.0
7.5
7.0
6.5
VCC = 3.5V
6.0
5.5 VCC = 2.5V
5.0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
VCC FALLING PROPAGATION DELAY
vs. TEMPERATURE
80
70
1mV
60 µs
50
40
30
20 10mV
µs
10
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
OVRST IN RISING PROPAGATION
DELAY vs. TEMPERATURE
(OVERVOLTAGE RESET INPUT)
70
60
1mV
50 µs
40
30
20
10mV
10 µs
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
RST IN_ FALLING PROPAGATION
DELAY vs. TEMPERATURE
120
100 1mV
µs
80
60
40
10mV
20 µs
0
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
RESET TIMEOUT
vs. TEMPERATURE
1.10
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
RESET THRESHOLD
vs. TEMPERATURE
1.010
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
-60 -40 -20 0 20 40 60 80 100
TEMPERATURE (°C)
10,000
MAXIMUM TRANSIENT DURATION vs.
VCC RESET THRESHOLD OVERDRIVE
RESET OCCURS ABOVE LINES
1000
MAXIMUM TRANSIENT DURATION vs.
OVRST IN THRESHOLD OVERDRIVE
10,000
RESET OCCURS ABOVE LINES
1000
MAXIMUM TRANSIENT DURATION vs.
RST IN_ THRESHOLD OVERDRIVE
10,000
RESET OCCURS ABOVE LINES
1000
VTH = 5.0V
100
100 VTH = 5.0V
100 VTH = 5.0V
10 VTH = 2.5V
1
0
4
400 800
OVERDRIVE, VTH - VCC (mV)
1200
10
1
0
VTH = 3.0V
400 800
OVERDRIVE, VOVRST IN - VREF (mV)
1200
VTH = 3.0V
10
1
0 400 800 1200
OVERDRIVE, VREF - VRST IN (mV)
4페이지 5-Pin, Multiple-Input,
Programmable Reset ICs
VIN
R1
R2
VCC
MAX6305–
MAX6313
RST IN_
C*
GND
*FOR ADDITIONAL NOISE IMMUNITY
( )VTH =
R1 + R2
R2
VRSTH
( )*ƒC
=
1
2π
R1 + R2
R1 x R2 x C
VCC
MAX6305
MAX6306 RESET
MAX6307
RESET
GENERATOR
GND
VCC
RESET
µP
GND
Figure 2. Increasing Noise Immunity
Figure 3. Interfacing to µPs with Bidirectional Reset I/O
The ±25nA max input leakage current allows resistors on
the order of megohms. Choose the pull-up resistor in the
divider to minimize the error due to the input leakage cur-
rent. The error term in the calculated threshold is simply:
±25nA x R1
If you choose R1 to be 1MΩ, the resulting error is
±25 x 10-9 x 1 x 106 = ±25mV.
Like the VCC voltage monitors on the MAX6306/MAX6307/
MAX6309/MAX6310/MAX6312/MAX6313, the RST IN_
inputs (when used with a voltage divider) are designed to
ignore fast voltage transients. Increase the noise immunity
by connecting a capacitor on the order of 0.1µF between
RST IN and GND (Figure 2). This creates a single-pole
lowpass filter with a corner frequency given by:
f = (1/2π) / (R1 + R2)(R1 x R2 x C)
For example, if R1 = 1MΩ and R2 = 1.6MΩ, adding a
0.1µF capacitor from RST IN_ to ground results in a
lowpass corner frequency of f = 2.59Hz. Note that
adding capacitance to RST IN slows the circuit’s overall
response time.
__________Applications Information
Interfacing to µPs with
Bidirectional Reset Pins
Since the RESET output on the MAX6305/MAX6306/
MAX6307 is open drain, these devices interface easily
with µPs that have bidirectional reset pins, such as the
Motorola 68HC11. Connecting the µP supervisor’s
RESET output directly to the microcontroller’s RESET
pin with a single pull-up resistor allows either device to
assert reset (Figure 3).
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
VCC transients (glitches).
The Typical Operating Characteristics show the
Maximum Transient Duration vs. VCC Reset Threshold
Overdrive, for which reset pulses are not generated.
The graph was produced using negative-going pulses,
starting at VTH max, and ending below the pro-
grammed reset threshold by the magnitude indicated
(reset threshold overdrive). The graph shows the maxi-
mum pulse width that a negative-going VCC transient
may typically have without causing a reset pulse to be
issued. As the amplitude of the transient increases (i.e.,
goes farther below the reset threshold), the maximum
allowable pulse width decreases.
RST IN_/OVRST IN are also immune to negative/positive-
going transients (see Typical Operating Characteristics).
A 0.1µF bypass capacitor mounted close to the RST IN_,
OVRST IN, and/or the VCC pin provides additional tran-
sient immunity.
Ensuring a Valid RESET/RESET
Output Down to VCC = 0V
When VCC falls below 1V, push/pull structured RESET/
RESET current sinking (or sourcing) capabilities
decrease drastically. High-impedance CMOS-logic
inputs connected to RESET can drift to undetermined
voltages. This presents no problem in most applica-
tions, since most µPs and other circuitry do not operate
with VCC below 1V. In those applications where RESET
must be valid down to 0V, adding a pull-down resistor
between RESET and ground sinks any stray leakage
7
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DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |