MAX6467XS20D3/V+T [MAXIM]
Power Supply Support Circuit;
| 型号： | MAX6467XS20D3/V+T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit |
| 文件： | 总10页 (文件大小：1093K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
General Description
Features
● Precision Factory-Set Reset Threshold Voltages for
The MAX6467/MAX6468 microprocessor (µP) supervi-
sory circuits monitor single power-supply voltages from
+1.8V to +5.0V and assert a reset if the supply voltage
drops below its preset threshold. An edge-triggered, one-
shot manual reset function ensures that the µP enters
the reset mode for a fixed timeout period only, even in
the event of a continuously asserted manual reset. The
MAX6467/MAX6468 significantly improve system reli-
ability compared to traditional manual reset supervisory
circuits.
+5.0V, +3.3V, +3.0V, +2.5V, and +1.8V Supplies
● Edge-Triggered Manual Reset Input with One-Shot
Pulsed Reset Output
● Two Reset Timeout Period Options (150ms or
1200ms min)
● Immune to Short Voltage Transients
● Low Supply Current (3µA at V
= +1.8V)
CC
● RESET Valid to V
= +1V
CC
● Active-Low Open-Drain and Push-Pull RESET Output
A variety of factory-trimmed threshold options accommo-
date different supply voltages and tolerances, eliminating
external components. The factory-set thresholds range
from +1.575V to +4.625V to monitor +5.0V, +3.3V, +3.0V,
+2.5V, and +1.8V supplies with various tolerances. Reset
timeout periods of 150ms (min) and 1200ms (min) are
available to accommodate different µP platforms.
Options
● -40°C to +125°C Operating Temperature Range
● Small 4-Pin SC70 and SOT143 Packages
● No External Components Required
● Pin Compatible with MAX811, MAX6315, MAX6384,
and MAX6386
A single, active-low RESET output asserts when V
CC
drops below its threshold or if the edge-triggered MR
asserts low. RESET remains low for the reset time-
Ordering Information appears at end of data sheet.
out period after V
rises above its threshold and for
CC
a fixed, one-shot timeout period after a manual reset
input falling edge. RESET remains valid as long as V
remains above +1V. Open-drain (MAX6467) and push-
pull (MAX6468) output options provide additional flexibility
in the system design.
CC
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX6467.related.
The MAX6467/MAX6468 are offered in the space-saving
4-pin SOT143 package and the ultra-small 4-pin SC70
package and are specified over the automotive (-40°C to
+125°C) temperature range.
Typical Operating Circuit appears at end of data sheet.
Applications
● Cell Phones/PDAs
● Embedded Control Systems
● Industrial Equipment
● Automotive Products
● Portable/Battery-Powered Equipment
● Medical Devices
● DSL Modems
● MP3 Players
● GPS Systems
● Digital Cameras
19-2523; Rev 2; 3/14
MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Absolute Maximum Ratings
V
to GND .........................................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
A
CC
RESET to GND
Open-Drain.......................................................-0.3V to +6.0V
Push-Pull .............................................. -0.3V to (V
MR to GND............................................... -0.3V to (V
Input/Output Current (all pins)............................................20mA
4-Pin SC70 (derate 3.1mW/°C above +70°C).............245mW
4-Pin SOT143 (derate 4mW/°C above +70vC)...........320mW
Operating Temperature Range......................... -40°C to +125°C
Storage Temperature Range............................ -65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
+ 0.3V)
+ 0.3V)
CC
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
= +1.2V to +5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
= 0°C to +125°C
MIN
1.0
TYP
MAX
5.5
UNITS
T
T
A
Operating Voltage Range
Supply Current
V
V
CC
= -40°C to 0°C
1.2
5.5
A
V
V
V
V
= +5.5V, no load
= +3.6V, no load
= +2.5V, no load
= +1.8V, no load
7
6
4
3
13
CC
CC
CC
CC
11
I
µA
V
CC
8
7.5
T
T
T
= +25°C
-1.5%
-2.5%
-3%
V
+1.5%
+2.5%
+3%
A
A
A
TH
V
Reset Threshold
CC
(See the Reset Threshold Table)
V
= -40°C to +85°C
= +85°C to +125°C
TH
V
falling at 10mV/µs from V + 100mV
TH
CC
V
V
Reset Delay
t
35
µs
CC
RD
to V - 100mV
TH
D3 option
150
1200
150
225
1800
225
300
2400
300
Reset Timeout Period
t
ms
CC
RP
D7 option
MR Timeout Period
t
D3 and D7 options
ms
ms
MRP
MR Rising Debounce Period
(Note 2)
t
D3 and D7 options
150
225
300
DEB
V
0.3 x V
CC
IL
V
< +4V
TH
TH
V
0.7 x V
IH
CC
MR Input Voltage
V
V
0.8
IL
V
≥ +4V
V
2.4
1
IH
MR Minimum Input Pulse
MR Glitch Rejection
µs
ns
ns
Ω
100
200
MR to RESET Delay
MR Pullup Resistance
MR to V
750
1500
2250
CC
V
≥ +2.5V, I
= 500µA, RESET
= 800µA, RESET
CC
SOURCE
0.8 x V
CC
not asserted
RESET Output High
(MAX6468 Only)
V
OH
V
V
≥ +4.5V, I
CC
SOURCE
0.8 x V
CC
not asserted
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MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Electrical Characteristics
(V
= +1.2V to +5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
CC
A
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
V
≥ +1V, I
= 80µA, RESET asserted
0.3
CC
SINK
≥ +2.5V, I
asserted
= 1.2mA, RESET
= 3.2mA, RESET
CC
SINK
0.3
0.3
1
RESET Output Low
V
V
OL
V
≥ +4.5V, I
CC
SINK
asserted
RESET Output Leakage Current
I
RESET not asserted
µA
LKG
(MAX6467 Only)
Note 1: Specifications over temperature are guaranteed by design. Production testing at T = +25°C only.
A
Note 2: The MR input ignores falling edges that occur within the MR rising debounce period (t
) after MR first rises from low to
DEB
high (after a valid MR reset assertion). This prevents invalid reset assertion due to switch bounce.
Typical Operating Characteristics
(V
= +5V, MAX6468US29D3 device, T = +25°C, unless otherwise noted.)
A
CC
V
CC
TO RESET DELAY
vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. SUPPLY VOLTAGE
26
24
22
20
18
16
10
9
8
7
6
5
4
3
2
1
0
10
9
8
7
6
5
4
3
2
1
0
V
CC
= V + 100mV TO V - 100mV
TH TH
V
CC
= +5.5V
V
CC
= +3.6V
V
= +1.8V
V
CC
= +2.5V
CC
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
RESET TIMEOUT PERIOD
vs. TEMPERATURE
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
600
550
500
450
400
350
300
250
200
150
100
50
210
209
208
207
206
205
204
203
202
201
200
1.010
1.005
1.000
0.995
0.990
V
= 5.0V
CC
0
0
1
2
3
4
I
5
6
7
8
9
10
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
(mA)
TEMPERATURE (°C)
TEMPERATURE (°C)
SINK
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MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Typical Operating Characteristics
(V
= +5V, MAX6468US29D3 device, T = +25°C, unless otherwise noted.)
CC
A
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
600
500
400
300
200
100
0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= +5.0V
CC
RESET ASSERTS
ABOVE THIS LINE
0
10
20
30
40
50
60
0
1
2
3
4
5
6
7
8
RESET THRESHOLD OVERDRIVE (mV)
I
(mA)
SOURCE
MR TO RESET DELAY
vs. TEMPERATURE
PROPAGATION DELAY
(WITH 100mV OVERDRIVE)
MAX6467 toc10
120
115
110
105
100
95
3.0V
V
CC
100mV/div
AC-COUPLED
2.8V
90
3V
85
80
RESET 1V/div
75
70
0
65
60
-40 -25 -10
5
20 35 50 65 80 95 110 125
4µs/div
TEMPERATURE (°C)
RESET PULLUP AND PULLDOWN RESPONSE
RESET TIMEOUT PERIOD
MAX6467 toc11
MAX6467 toc12
3.3V
1.675V
200mV/div
V
V 2V/div
CC
CC
C
= 47pF, R
= 1.6V
= 100kΩ,
PULLUP
RESET
1.475V
V
PULLUP
0
1.6V
3.3V
RESET 500mV/div
RESET 2V/div
0
0
MAX6467_S16D3-T
40µs/div
40ms/div
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MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Pin Configurations
TOP VIEW
4
3
V
CC
GND
1
2
4
3
V
CC
1
2
GND
MAX6467US
MAX6468US
MAX6467XS
MAX6468XS
RESET
MR
MR
RESET
SOT143
SC70
Pin Description
PIN
NAME
FUNCTION
1
GND
Ground
Reset Output. RESET is an active-low open-drain (MAX6467) or push-pull (MAX6468) output. RESET
asserts low when V drops below the selected threshold and remains low for the V reset timeout period
CC
CC
2
RESET
MR
after V
rises above the threshold. The RESET one-shot asserts low for a fixed MR reset timeout period on
CC
the falling edge of the manual reset input. The open-drain output requires an external pullup resistor
Manual Reset Input. Drive MR low to initiate a reset output. MR controls an edge-triggered one-shot that
asserts RESET low for a fixed MR timeout period when MR is driven low. Internal timing circuitry ignores
switch close and open bounce to ensure proper one-shot reset timing
3
4
Power-Supply Input. V
provides power to the device and is also a monitored voltage. When V
drops
CC
CC
V
below the selected threshold, RESET asserts low and remains low for the reset timeout period after V
CC
CC
rises above the threshold. For better noise immunity, bypass V
to GND with a 0.1µF capacitor
CC
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MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
V
CC
V
TH
GND
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
MR
GND
RESET
GND
t
t
t
t
MRP
RP
MRP
DEB
Figure 1. Timing Diagram
RESET low. RESET is one-shot pulsed low for the MR
timeout period after a falling edge on MR. An internal
Detailed Description
Reset Output
The MAX6467 provides an active-low open-drain
1.5kΩ pullup resistor to V
allows MR to be left uncon-
CC
nected if not used. MR can be driven with TTL or CMOS-
logic levels, or with open-drain/collector outputs. Connect
a normally open momentary pushbutton switch from
MR to GND to realize a manual reset function. External
debounce circuitry is not required, as the MAX6467/
MAX6468 respond to the first falling edge on MR and
ignore subsequent falling edges within the reset timeout
period and during the MR debounce period (see Figure
RESET output. The MAX6468 provides an active-low
push-pull RESET output. RESET asserts low if V
CC
drops below the selected threshold or if a falling edge
occurs on MR. RESET remains low for the V
reset
CC
timeout period after V
increases above the threshold
CC
voltage or is one-shot pulsed low for the MR timeout
period after a falling edge on MR.
1). After MR goes high for 150ms (t
), the manual reset
DEB
Manual Reset Input
one-shot is ready to trigger a reset on the next MR falling
edge. Connect a 0.1µF capacitor from MR to GND when
using long cables to provide additional noise immunity
(Figure 2).
Many µP-based products require manual reset capability,
allowing the operator, a test technician, or external logic
circuitry to initiate a reset. A falling edge on MR asserts
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MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Reset Timeout Delay*
V
RESET TIMEOUT PERIOD
MR TIMEOUT PERIOD
MR RISING DEBOUNCE PERIOD
CC
RESET TIMEOUT SUFFIX
(min/max) (ms)
(min/max) (ms)
(min/max) (ms)
D3
D7
150/300
150/300
150/300
150/300
150/300
1200/2400
*Additional reset timeout options may be available. Contact factory for availability.
farther below the reset threshold), the maximum allowable
pulse width decreases. A 0.1µF bypass capacitor from
Applications Information
Falling V
Transients
CC
V
CC
to GND provides additional transient immunity.
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the MAX6467/
MAX6468 are relatively immune to short-duration fall-
Ensuring a Valid RESET Output Down
to V = 0V
CC
The MAX6467/MAX6468 guarantee proper operation
down to V = +1V. In applications that require valid
ing V
transients (glitches). The Typical Operating
CC
Characteristics section shows the Maximum Transient
Duration vs. V Overdrive for which the MAX6467/
CC
reset levels down to V
= 0V, a pulldown resistor to
CC
CC
active-low outputs (MAX6468 only, Figure 3) ensures
that RESET remains valid while the RESET output can
no longer sink current. This scheme does not work with
the open-drain outputs of the MAX6467. Ensure that the
resistor value used does not overload the RESET output
MAX6468 do not generate a reset pulse. This graph was
generated using a falling pulse applied to V starting
CC
above the actual reset threshold and ending below the
threshold by the magnitude indicated (V Overdrive).
CC
The graph indicates the typical maximum pulse width a
falling V transient can have without initiating a reset
when V
is above the reset threshold. For most applica-
CC
CC
tions, use 100kΩ to 1MΩ.
pulse. As the magnitude of the transient increases (goes
V
CC
MAX6467
MAX6468
V
CC
1.5kΩ
MR
V
CC
MR ONE-SHOT/
DEBOUNCE
RESET
MAX6468
R1
100kΩ
RESET
TIMEOUT
PERIOD
RESET
RESET
OUTPUT
GND
V
CC
1.23V
GND
Figure 3. RESET Valid to V
= 0V
CC
Chip Information
TRANSISTOR COUNT: 748
Figure 2. Functional Diagram
PROCESS: BiCMOS
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MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Standard Versions
Reset Threshold (-40°C to +85°C)
PART
TOP MARK
SUFFIX
V
TH
(min)
V
(typ)
V
TH
(max)
TH
MAX6467XS16D3
MAX6467XS22D3
MAX6467XS26D3
MAX6467XS29D3
MAX6467XS46D3
MAX6467US16D3
MAX6467US22D3
MAX6467US26D3
MAX6467US29D3
MAX6467US46D3
MAX6468XS16D3
MAX6468XS22D3
MAX6468XS26D3
MAX6468XS29D3
MAX6468XS46D3
MAX6468US16D3
MAX6468US22D3
MAX6468US26D3
MAX6468US29D3
MAX6468US46D3
AGL
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
4.509
4.625
4.500
4.375
4.300
4.200
4.100
4.000
3.900
3.800
3.700
3.600
3.500
3.400
3.300
3.200
3.075
3.000
2.925
2.800
2.700
2.625
2.500
2.400
2.313
2.188
2.100
2.000
1.900
1.800
1.665
1.575
4.741
AGM
AGN
AGO
AGP
4.388
4.266
4.193
4.095
3.998
3.900
3.803
3.705
3.608
3.510
3.413
3.315
3.218
3.120
2.998
2.925
2.852
2.730
2.633
2.559
2.438
2.340
2.255
2.133
2.048
1.950
1.853
1.755
1.623
1.536
4.613
4.484
4.408
4.305
4.203
4.100
3.998
3.895
3.793
3.690
3.588
3.485
3.383
3.280
3.152
3.075
2.998
2.870
2.768
2.691
2.563
2.460
2.370
2.242
2.153
2.050
1.948
1.845
1.707
1.614
KAFN
KAFO
KAFP
KAFQ
KAFR
AGQ
AGR
AGS
AGC
AGB
KAFS
KAFV
KAFT
KAFU
KAEW
Typical Operating Circuit
+1.0V TO +5.5V
V
CC
V
CC
MAX6467
MAX6468
RESET
INPUT
µP
MR
RESET
GND
GND
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MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Ordering Information
Package Information
For the latest package outline information and land patterns
PIN-
PART
TEMP RANGE
-40°C to +125°C
(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
MAX6467XS_ _D_-T
4 SC70-4
MAX6467XS_ _D_-T/V+T* -40°C to +125°C
4 SC70-4
MAX6467US_ _D_-T
MAX6468XS_ _D_-T
MAX6468US_ _D_-T
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
4 SOT143-4
4 SC70-4
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
4 SC70
C4+1
U3+1
21-0052
21-0098
90-0187
90-0187
4 SOT143-4
4 SOT143
Note: Insert reset threshold suffix (see Reset Threshold table)
after XS or US. Insert reset timeout delay (see Reset Timeout
Delay table) after D to complete the part number. Sample stock
is generally held on standard versions only (see Standard
Versions table). Standard versions have an order increment
requirement of 2500 pieces. Nonstandard versions have an
order increment requirement of 10,000 pieces. Contact factory
for availability Devices are available in both leaded and lead-
free packaging. Specify lead-free by replacing “T” with “+T”
when ordering.
T = Tape and reel.
/V denotes an automotive qualified part.
+Denotes a lead(pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
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MAX6467/MAX6468
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Revision History
REVISION REVISION
PAGES
DESCRIPTION
CHANGED
NUMBER
DATE
2
3/14
Added /V OPNs
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
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.
©
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
2014 Maxim Integrated Products, Inc.
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