MAX6454UT29T-T [MAXIM]
Power Supply Support Circuit;
| 型号： | MAX6454UT29T-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit |
| 文件： | 总11页 (文件大小：1107K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
General Description
Features
● Precision Factory-Set Reset Thresholds From
The MAX6453–MAX6456 are low-power, dual-voltage
1.6V to 4.6V
µP supervisors featuring separate V
reset and manu-
CC
al reset outputs. The dual outputs support both soft-
system reset (interrupt) and hard-system reset (reboot)
functions. The reset output asserts when any of the
monitored voltages falls below its specified threshold
and remains asserted for the reset timeout (140ms min)
after all voltages exceed their respective reset thres-
holds. All devices are offered with nine factory-fixed
reset thresholds for monitoring primary system voltages
● Adjustable Threshold to Monitor Voltages Down
to 0.63V
● Manual Reset Input with Extended Setup Period
● Immune to Short Voltage Transients
● Low 6µA Supply Current
● Guaranteed Valid Reset Down to V
= 1.0V
CC
● Active-Low RESET (Push-Pull or Open-Drain)
● Outputs
(V ) from 1.8V to 5V and an adjustable reset input for
CC
monitoring a secondary system voltage down to 0.63V.
Each device has a manual reset input, a V
reset out-
● 140ms (min) Reset Timeout Period
● Small SOT Package
CC
put, and a manual reset output. The MAX6453/MAX6454
manual reset output asserts when the manual reset input
is low. It remains asserted for the manual reset timeout
period (140ms min) after the manual reset input transi-
tions high. The MAX6453/MAX6454 manual reset input
controls only the manual reset output and does not affect
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
PIN-PACKAGE
6 SOT23
MAX6453UT_ _ _-T
MAX6454UT_ _ _-T
MAX6455UT_ _ _-T
MAX6456UT_ _ _-T
the V
reset output.
CC
6 SOT23
The manual reset input of the MAX6455/MAX6456 con-
trols both the manual reset and V reset outputs. When
6 SOT23
CC
the manual reset input is low for less than the extended
setup timeout period, only the manual reset output asserts
and remains asserted for the manual reset timeout period
(140ms min) after the manual reset input transitions high.
If the manual reset input is low for at least the extended
setup timeout period, the reset output also asserts and
remains asserted for the reset timeout period (140ms
min) after the manual reset input transitions high. This
enhanced feature allows the implementation of a soft/
hard-system reset combination.
6 SOT23
Note: The first “_ _” is a placeholder for the threshold voltage
level of the devices. A desired threshold level is set by the part
number suffix found in Table 1. The third “_” is a placeholder for
the manual reset setup period of the devices. A desired setup
period is set by the letter suffix found in Table 2. All devices are
available in tape-and-reel only. There is a 2500-piece minimum
order increment for standard versions (Table 2). Sample stock
is typically held on standard versions only. Nonstandard ver-
sions require a minimum order increment of 10,000 pieces.
Contact factory for availability.
Devices are available in both leaded and lead(Pb)-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
The MAX6453/MAX6455 have active-low, push-pull
reset and manual reset outputs, and the MAX6454/
MAX6456 have active-low, open-drain reset and manu-
al reset outputs. All devices are available in small
SOT23-6 packages and are fully specified over the
extended temperature range (-40°C to +85°C).
Selector Guide appears at end of data sheet.
Pin Configurations
TOP VIEW
Applications
RESET
GND
1
2
3
6
5
4
MR
RESET
1
2
3
6
5
4
MR
● Set-Top Boxes
● Consumer Electronics
● DVD Players
● Cable/DSL Modems
● MP3 Players
● Industrial Equipment
● Medical Devices
MAX6453
MAX6454
MAX6455
MAX6456
RSTIN GND
RSTIN
MROUT
V
CC
MROUT
V
CC
SOT23-6
SOT23-6
19-2637; Rev 4; 5/14
MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
Absolute Maximum Ratings
(All voltages referenced to GND)
Operating Temperature Range.......................... -40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range............................ -65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Soldering Temperature (reflow)
V
........................................................................-0.3V to +6V
CC
Open-Drain RESET, MROUT..................................-0.3V to +6V
MR, Push-Pull RESET, MROUT.............. -0.3V to (V
+ 0.3V)
CC
MR, RSTIN .............................................................-0.3V to +6V
Input Current, All Pins ......................................................±20mA
Lead(Pb)-free...............................................................+260°C
Containing Lead ..........................................................+240°C
Continuous Power Dissipation (T = +70°C)
A
6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........696mW
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
= 1.0V to 5.5V, T = -40°C to +85°C, unless otherwise specified. Typical values are at T = +25°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
5.5
UNITS
Operating Voltage Range
V
CC
1.0
V
V
V
= 5.5V, no load
7
20
CC
V
Supply Current
I
µA
CC
CC
CC
= 3.6V, no load
6
16
CC
46
44
31
29
26
23
22
17
16
4.50
4.25
3.00
2.85
2.55
2.25
2.12
1.62
1.52
4.63
4.38
3.08
2.93
2.63
2.32
2.19
1.67
1.58
60
4.75
4.50
3.15
3.00
2.70
2.38
2.25
1.71
1.62
V
Reset Threshold
V
V
TH
Reset Threshold Tempco
Reset Threshold Hysteresis
ppm/°C
mV
2 × V
TH
T
T
= 0°C to +85°C
0.615
0.610
0.630
0.645
0.650
A
RSTIN Threshold
V
V
TH-RSTIN
= -40°C to +85°C
A
RSTIN Threshold Hysteresis
RSTIN Input Current
V
2.5
mV
nA
µs
HYST
I
-25
+25
280
RSTIN
RSTIN to Reset Output Delay
Reset Timeout Period
V
V
falling at 1mV/µs
15
RSTIN
t
t
140
210
ms
µs
RP
V
to RESET Output Delay
falling at 1mV/µs
CC
20
CC
RD
K
L
6.72
4.48
2.24
1.12
2.24
10.08
6.72
3.36
1.68
3.36
13.44
8.16
4.48
2.24
4.48
MR Minimum Setup Period
t
MR to RESET
s
MR
(Pulse Width)
S
T
MR Minimum Input Pulse
MR Glitch Rejection
RESET asserted, MAX6455/MAX6456
s
100
200
210
ns
ns
ms
MR to MROUT Delay
Manual Reset Timeout Period
t
140
280
MRP
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MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
Electrical Characteristics (continued)
(V
= 1.0V to 5.5V, T = -40°C to +85°C, unless otherwise specified. Typical values are at T = +25°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MR to V
Pullup Impedance
25
50
75
kW
CC
V
≥ 1.00V, I
= 50µA, outputs
CC
SINK
0.3
0.3
0.3
0.4
asserted
V
≥ 1.20V, I
= 100µA, outputs
= 1.2mA, outputs
= 3.2mA, outputs
CC
SINK
asserted
RESET, MROUT Output Low
V
V
OL
(Open Drain or Push-Pull)
V
≥ 2.55V, I
CC
SINK
asserted
V
≥ 4.25V, I
CC
SINK
asserted
V
≥ 1.80V, I
= 200µA,
= 500µA,
= 800µA,
CC
SOURCE
0.8 × V
0.8 × V
0.8 × V
CC
CC
CC
outputs deasserted
RESET, MROUT Output High
V
≥ 3.15V, I
CC SOURCE
V
V
OH
(Push-Pull)
outputs deasserted
V
≥ 4.75V, I
CC
SOURCE
outputs deasserted
RESET, MROUT Output
I
Outputs deasserted
1
µA
LKG
Open-Drain Leakage Current
MR Input Low Voltage
MR Input High Voltage
V
0.3 × V
V
V
IL
CC
V
0.7 × V
IH
CC
Note 1: Devices production tested at T = 25°C. Overtemperature limits are guaranteed by design.
A
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MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
Typical Operating Characteristics
(V
= 3.3V, T = +25°C, unless otherwise noted.)
CC
A
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
9
8
7
6
5
4
3
2
1
0
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
250
T
= +85°C
A
T
A
= +25°C
200
150
100
50
RESET OCCURS
ABOVE THE CURVE
T
= -40°C
A
V
= 4.4V
800
TH
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
-40
-15
10
TEMPERATURE (°C)
35
60
85
0
200
400
600
1000
RESET THRESHOLD OVERDRIVE (mV)
NORMALIZED V RESET THRESHOLD
CC
V
CC
TO RESET DELAY
RSTIN TO RESET DELAY
vs. TEMPERATURE
vs. TEMPERATURE
vs. TEMPERATURE (RSTIN FALLING)
1.03
1.02
1.01
1.00
0.99
0.98
0.97
24.0
23.6
23.2
22.8
22.4
22.0
21.6
21.2
20.8
20.4
20.0
24.0
23.6
23.2
22.8
22.4
22.0
21.6
21.2
20.8
20.4
20.0
V
FALLING AT 1mV/µs
RSTIN FALLING AT 1mV/µs
CC
-40
-15
10
35
60
85
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
MANUAL RESET TO MROUT AND
RESET DELAY (MAX6455/MAX6456)
V
TO RESET DELAY
CC
MAX6453 toc08
MAX6453 toc07
V
= 5V
CC
V
= 4.5V
CC
MR (5V/div)
V
= 4.392V
TH
V
= 4.3V
CC
V
(100mV/div)
CC
MROUT (5V/div)
RESET (5V/div)
RESET (2V/div)
TIME (100µs/div)
TIME (1s/div)
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MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
Pin Description
PIN
NAME
FUNCTION
Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when
MAX6453
MAX6454
MAX6455
MAX6456
V
or RSTIN drops below its selected reset threshold. RESET remains low for the
CC
1
—
1
140ms (min) reset timeout period after all monitored power-supply inputs exceed their
selected reset thresholds. MR does not affect RESET output. For open-drain outputs,
connect to an external pullup resistor.
RESET
Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when
V
or RSTIN drops below its selected reset threshold. RESET remains low for the
CC
140ms (min) reset timeout period after all monitored power-supply inputs exceed their
selected reset thresholds. RESET changes from high to low after MR input is held
low for the extended (typ) setup timeout period and deasserts 140ms (min) after MR
deasserts. For open-drain outputs, connect to an external pullup resistor.
—
2
3
2
3
GND
Ground
Manual Reset Push-Pull or Open-Drain Output. MROUT asserts immediately after MR
is pulled low. MROUT remains low for 140ms (min) after MR is deasserted. For open-
drain outputs, connect to an external pullup resistor.
MROUT
V
Voltage Input. Power supply and input for the primary microprocessor voltage reset
CC
monitor.
4
5
4
5
V
CC
Reset Input. High-impedance input to the adjustable reset comparator. Connect RSTIN
to the center point of an external resistor divider to set the threshold of the externally
monitored voltage.
RSTIN
Manual Reset Input. Internal 50kW pullup to V . Pull MR low to immediately assert
CC
6
—
6
MROUT. MR does not affect RESET output.
MR
Manual Reset Input. Internal 50kW pullup to V . Pull MR low to immediately assert
CC
—
MROUT. RESET changes from high to low after MR input is held low for the extended
(typ) setup timeout period.
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MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
Manual Reset
The MAX6453/MAX6454 contain a manual reset output
(MROUT) that asserts low immediately after driving MR
low and remains low for the reset timeout period after
MR goes high (Figure 1). The pushbutton manual reset
has no effect on the RESET output. MROUT output can
be used to drive an NMI (nonmaskable interrupt) on the
processor to save valuable data.
MR
210ms
MROUT
Figure 1. MAX6453/MAX6454 Timing Diagram
The MAX6455/MAX6456’s MROUT is asserted imme-
diately upon driving MR low. Driving MR low for longer
than the extended (typ) setup timeout period asserts
RESET. When MR is deasserted, MROUT and RESET
remain asserted low for the reset timeout period after
MR goes high (Figure 2).
Detailed Description
Reset Output
The reset output is typically connected to the reset input of
a microprocessor (µP). A µP’s reset input starts or restarts
the µP in a known state. The MAX6453–MAX6456 µP
supervisory circuits provide the reset logic to prevent
code-execution errors during power-up, power-down and
brownout conditions (see the Typical Operating Circuit).
Adjustable Input Voltage (RSTIN)
The MAX6453–MAX6456 monitor the voltage on RSTIN
using an adjustable reset threshold set with an external
resistor voltage divider (Figure 3). Use the following
formula to calculate the externally monitored voltage
RESET changes from high to low whenever the moni-
tored voltage (RSTIN or V ) drops below the reset
CC
(V
):
MON-TH
threshold voltages. When VRSTIN and V
exceed their
CC
respective reset threshold voltages, RESET remains low
for the reset timeout period, and then goes high. RESET
changes from high to low after MR input is held low for the
extended (typ) setup timeout period and deasserts 140ms
(min) after MR deasserts.
V
= V
× (R1 +R2)/R2
MON-TH
TH-RSTIN
where V
and V
is the desired reset threshold voltage
is the reset input threshold (0.63V).
MON_TH
TH-RSTIN
Resistors R1 and R2 can have very high values to mini-
mize current consumption due to low leakage currents.
Set R2 to some conveniently high value (250kW, for
example) and calculate R1 based on the desired reset
threshold voltage, using the following formula:
RESET is guaranteed to be in the proper output logic
state for V
inputs ≥ 1V. For applications requiring valid
CC
reset logic when V
is less than 1V, see the Ensuring a
CC
Valid RESET Output Down to V
= 0V section.
CC
R1 = R2 5 (V
)W
MON_TH/VTH - 1
LONG SETUP PERIOD
MR
210ms
MROUT
RESET
Figure 2. MAX6455/MAX6456 Timing Diagram
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MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
Generally, the pullup resistor connected to the RESET
connects to the supply voltage being monitored at the
V
V
CC
MON_TH
IC’s V
pin. However, some systems might use the
CC
open-drain output to level-shift from the monitored supply
to reset circuitry powered by some other supply (Figure
MAX6453
MAX6455
R1
R2
5). Keep in mind that as the supervisor’s V
decreases
CC
RSTIN
GND
V
CC
toward 1V, so does the IC’s ability to sink current at
decays toward
RESET (RESET is pulled high as V
CC
0). The voltage where this occurs depends on the pullup
resistor value and the voltage to which it is connected.
RESET
Ensuring a Valid RESET Down to V
(Push-Pull RESET)
= 0V
CC
When V
falls below 1V, RESET current-sinking capabil-
CC
V
= 0.63 x (R1 + R2) / R2
MON_TH
ities decline drastically. The high-impedance CMOS-logic
inputs connected to RESET can drift to undetermined
voltages. This presents no problem in most applications,
because most µPs and other circuitry do not operate with
Figure 3. Calculating The Monitored Threshold Voltages
V
below 1V.
Applications Information
CC
In applications where RESET must be valid down to 0V,
add a pulldown resistor between RESET and GND for
the push/pull outputs. The resistor sinks any stray leak-
age currents, holding RESET low (Figure 6). The value
of the pulldown resistor is not critical; 100kW is large
enough not to load RESET and small enough to pull
RESET to ground. The external pulldown cannot be
used with the open-drain reset outputs.
Interrupt Before Reset
To minimize data loss and speed system recovery/test,
many applications interrupt the processor or reset only
portions of the system before a processor hard reset
is asserted. The extended setup time of the MAX6455/
MAX6456 MR input allows the same pushbutton (Figure
4) to control both the interrupt and hard reset functions.
If the pushbutton is closed for less than the extended
setup timeout period, the processor is only interrupted
(MROUT). If the system still does not respond properly,
the pushbutton can be closed for the full extended
setup timeout period to hard reset the processor
(RESET). If desired, connect a LED to the RESET out-
put to turn off (or on) to signify when the pushbutton is
closed long enough for a hard reset (the same LED can
be used as the front panel power-on display).
Transient Immunity
In addition to issuing a reset to the µP during power-up,
power-down and brownout conditions, these supervisors
are relatively immune to short duration falling transients
(glitches). The graph Maximum Transient Duration vs.
Reset Threshold Overdrive in the Typical Operating
Characteristics section shows this relationship.
The area below the curves of the graph is the region in
which these devices typically do not generate a reset
pulse. This graph was generated using a negative
Interfacing to Other Voltages
for Logic Compatibility
going pulse applied to V , starting above the actual
reset threshold (V ) and ending below it by the magni-
TH
tude indicated (reset-threshold overdrive). As the mag-
The open-drain RESET output can be used to interface
to a µP with other logic levels. As shown in Figure 5, the
open-drain output can be connected to voltages from 0
to 6V.
CC
nitude of the transient increases (V
goes further
CC
below the reset threshold), the maximum allowable
pulse width decreases. Typically, a V transient that
CC
goes 100mV below the reset threshold and lasts 20µs
or less does not cause a reset pulse to be issued.
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MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
+3.3V
+1.5V
3.3V
5V
CORE SUPPLY I/O
SUPPLY
V
CC
RESET
RESET
V
CC
V
CC
MAX6455
RSTIN
GND
µP
100kΩ
MAX6454
MAX6456
LED
µP
MROUT
MR
NMI
RESET
RESET
GND
GND
PUSHBUTTON SWITCH
CLOSE FOR IMMEDIATE SYSTEM INTERRUPT
CLOSE FOR >3.36s FOR SYSTEM RESET
Figure 4. Interrupt Before Reset Application Circuit
Figure 5. Interfacing to Other Voltage Levels
Functional Diagram
V
CC
MAX6453–
MAX6456
V
CC
V
CC
RESET
TIMOUT PERIOD
(210ms typ)
RESET
MAX6453
MAX6455
RSTIN
MR-TO-RESET
SETUP PERIOD
(3.36s typ)
RESET
V
CC
MAX6455/MAX6456
100kΩ
0.63V
GND
1.23V
MROUT
TIMOUT PERIOD
(210ms typ)
MROUT
V
CC
GND
MR
Figure 6. Ensuring RESET Valid to V
= 0
CC
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MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
Table 1. Reset Voltage Threshold
Table 3. Standard Versions Table
TOP
TOP
PART NO.
SUFFIX
( _ _ )
V
NOMINAL
CC
PART
PART
MARK
MARK
VOLTAGE
THRESHOLD (V)
MAX6453UT16S
MAX6453UT23S
MAX6453UT26S
MAX6453UT29S
MAX6453UT46S
MAX6454UT16S
MAX6454UT23S
MAX6454UT26S
MAX6454UT29S
MAX6454UT46S
ABOG MAX6455UT16S
ABOL
ABOM
ABON
ABOO
ABER
ABES
ABOT
ABOU
ABOV
ABOW
46
44
31
29
26
23
22
17
16
4.625
4.375
3.075
2.925
2.625
2.313
2.188
1.665
1.575
ABOH MAX6455UT23S
ABOI
ABOJ
ABOK
ABOP
ABEQ
MAX6455UT26S
MAX6455UT29S
MAX6455UT46S
MAX6456UT16S
MAX6456UT23S
ABOQ MAX6456UT26S
ABOR MAX6456UT29S
ABOS
MAX6456UT46S
Table 2. Manual Reset Setup Period
PART NO.
SUFFIX
( _ )
MANUAL RESET PERIOD
(s)
K
L
10.08
6.72
3.36
1.68
S
T
Selector Guide
MROUT AND RESET
MROUT AND RESET
PART
MR TO RESET DELAY
MR ASSERTION
PUSH-PULL OUTPUT
OPEN-DRAIN OUTPUT
MAX6453
MAX6454
MAX6455
MAX6456
—
—
✔
✔
MROUT
—
✔
—
✔
✔
—
✔
—
MROUT
MROUT and RESET
MROUT and RESET
Typical Operating Circuit
+3.3V
+1.5V
CORE SUPPLY I/O
SUPPLY
V
CC
RESET
RESET
RSTIN
µP
MAX6453
MROUT
NMI
MR
GND
GND
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MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
Chip Information
PROCESS: BiCMOS
Package Information
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 PACKAGE DOCUMENT
LAND
PATTERN NO.
TYPE
CODE
NO.
6 SOT23
U6-1
21-0058
90-0175
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MAX6453–MAX6456
µP Supervisors with Separate V
Reset and
CC
Manual Reset Outputs
Revision History
REVISION REVISION
PAGES
CHANGED
DESCRIPTION
NUMBER
DATE
0
10/02
Initial release
—
Revised the General Description, Features, Applications, Ordering Information,
Absolute Maximum Ratings, Electrical Characteristics, Pin Description, the Reset
Output, Manual Reset, and Interrupt Before Reset sections, and Tables 2 and 3 to
add extended setup time specifications.
3
4
6/10
5/14
1, 2, 5, 6, 7, 9
1
No /V OPNs; removed automotive reference from Applications section
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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.
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2014 Maxim Integrated Products, Inc.
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