MAX6467XS27D3-T [MAXIM]
Microprocessor Supervisory Reset Circuits with Edge-Triggered One-Shot Manual Reset ; 微处理器监控复位电路，带有边沿触发单稳态手动复位\n
| 型号： | MAX6467XS27D3-T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Microprocessor Supervisory Reset Circuits with Edge-Triggered One-Shot Manual Reset
|
| 文件： | 总9页 (文件大小：265K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-2523; Rev 0; 7/02
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
General Description
Features
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 reliability compared to traditional manual reset
supervisory circuits.
ꢀ Precision Factory-Set Reset Threshold Voltages
for +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
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.
ꢀ RESET Valid to V
= +1V
CC
ꢀ Active-Low Open-Drain and Push-Pull RESET
Output Options
ꢀ -40°C to +125°C Operating Temperature Range
ꢀ Small 4-Pin SC70 and SOT143 Packages
ꢀ No External Components Required
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 timeout
ꢀ Pin Compatible with MAX811, MAX6315,
period after V
rises above its threshold and for a fixed,
CC
MAX6384, and MAX6386
one-shot timeout period after a manual reset input falling
edge. RESET remains valid as long as V remains
CC
Ordering Information
above +1V. Open-drain (MAX6467) and push-pull
(MAX6468) output options provide additional flexibility in
the system design.
PART
MAX6467XS_ _D_-T -40°C to +125°C
MAX6467US_ _D_-T -40°C to +125°C
MAX6468XS_ _D_-T -40°C to +125°C
MAX6468US_ _D_-T -40°C to +125°C
TEMP RANGE
PIN-PACKAGE
4 SC70-4
4 SOT143-4
4 SC70-4
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.
4 SOT143-4
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.
Applications
Cell Phones/PDAs
Embedded Control Systems
Industrial Equipment
Automotive Products
Portable/Battery-Powered Equipment
Medical Devices
Pin Configurations
TOP VIEW
DSL Modems
GND
1
2
4
3
V
CC
MP3 Players
MAX6467XS
MAX6468XS
GPS Systems
MR
RESET
Digital Cameras
SC70
Pin Configurations continued at end of data sheet.
Typical Operating Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
ABSOLUTE MAXIMUM RATINGS
CC
V
to GND...........................................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
A
4-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
4-Pin SOT143 (derate 4mW/°C above +70°C).............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
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
+ 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
CC
= +1.2V to +5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A A
PARAMETER
SYMBOL
CONDITIONS
= 0°C to +125°C
MIN
1.0
TYP
MAX
5.5
UNITS
T
T
A
A
Operating Voltage Range
Supply Current
V
V
CC
= -40°C to 0°C
1.2
5.5
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
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
= -40°C to +85°C
= +85°C to +125°C
V
V
TH
(See the Reset Threshold Table)
V
falling at 10mV/µs from V + 100mV
TH
CC
V
V
Reset Delay
t
35
µs
CC
CC
RD
to V - 100mV
TH
D3 option
150
1200
150
225
1800
225
300
2400
300
Reset Timeout Period
t
ms
ms
ms
RP
D7 option
MR Timeout Period
t
D3 and D7 options
MRP
MR Rising Debounce Period
(Note 2)
t
D3 and D7 options
150
225
300
DEB
V
0.3 x V
CC
IL
V
V
< +4V
TH
TH
V
0.7 x V
IH
CC
MR Input Voltage
V
V
0.8
IL
≥ +4V
V
2.4
1
IH
MR Minimum Input Pulse
MR Glitch Rejection
MR to RESET Delay
MR Pullup Resistance
µs
ns
ns
Ω
100
200
MR to V
750
1500
2250
CC
V
≥ +2.5V, I
= 500µA, RESET not
= 800µA, RESET not
CC
SOURCE
0.8 x V
CC
CC
asserted
RESET Output High
(MAX6468 Only)
V
V
OH
V
≥ +4.5V, I
CC
SOURCE
0.8 x V
asserted
2
_______________________________________________________________________________________
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +1.2V to +5.5V, T = -40°C to +125°C, unless otherwise noted. Typical values are at T = +25°C.) (Note 1)
A A
PARAMETER
SYMBOL
CONDITIONS
= 80µA, RESET asserted
SINK
MIN
TYP
MAX
UNITS
V
V
≥ +1V, I
0.3
CC
CC
≥ +2.5V, I
= 1.2mA, RESET
SINK
0.3
0.3
1
asserted
RESET Output Low
V
V
OL
V
≥ +4.5V, I
= 3.2mA, RESET
CC
SINK
asserted
RESET Output Leakage Current
(MAX6467 Only)
I
RESET not asserted
µA
LKG
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
CC
= +5V, MAX6468US29D3 device, T = +25°C, unless otherwise noted.)
A
V
TO RESET DELAY
CC
SUPPLY CURRENT vs. SUPPLY VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
vs. TEMPERATURE
10
10
9
8
7
6
5
4
3
2
1
0
26
24
22
20
18
16
V
= V + 100mV TO V - 100mV
CC
TH
TH
9
8
7
6
5
4
3
2
1
0
V
= +5.5V
CC
V
CC
= +3.6V
V
= +1.8V
V
= +2.5V
CC
CC
5
-40 -25 -10
20 35 50 65 80 95 110 125
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)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
RESET TIMEOUT PERIOD
vs. TEMPERATURE
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE
OUTPUT VOLTAGE LOW
vs. SINK CURRENT
210
209
208
207
206
205
204
203
202
201
200
1.010
1.005
1.000
0.995
0.990
600
550
500
450
400
350
300
250
200
150
100
50
V
= 5.0V
CC
0
-40 -25 -10
5
20 35 50 65 80 95 110 125
-40 -25 -10
5
20 35 50 65 80 95 110 125
0
1
2
3
4
5
6
7
8
9
10
TEMPERATURE (°C)
TEMPERATURE (°C)
I
(mA)
SINK
_______________________________________________________________________________________
3
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Typical Operating Characteristics (continued)
(V
CC
= +5V, MAX6468US29D3 device, T = +25°C, unless otherwise noted.)
A
OUTPUT VOLTAGE HIGH
vs. SOURCE CURRENT
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
600
V
CC
= +5.0V
500
400
300
200
100
0
RESET ASSERTS
ABOVE THIS LINE
0
1
2
3
4
5
6
7
8
0
10
20
30
40
50
60
I
(mA)
RESET THRESHOLD OVERDRIVE (mV)
SOURCE
PROPAGATION DELAY
(WITH 100mV OVERDRIVE)
MR TO RESET DELAY
vs. TEMPERATURE
MAX6467 toc10
120
115
110
105
100
95
3.0V
V
100mV/div
CC
AC-COUPLED
2.8V
3V
90
85
80
RESET 1V/div
0
75
70
65
60
4µs/div
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
RESET TIMEOUT PERIOD
RESET PULLUP AND PULLDOWN RESPONSE
MAX6467 toc12
MAX6467 toc11
3.3V
1.675V
200mV/div
V
2V/div
V
CC
CC
C
= 47pF, R
= 100kΩ,
PULLUP
RESET
1.475V
V
= 1.6V
PULLUP
0
1.6V
3.3V
RESET 500mV/div
RESET 2V/div
0
0
MAX6467_S16D3-T
40ms/div
40µs/div
4
_______________________________________________________________________________________
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
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 after
CC
CC
2
RESET
MR
V
rises above the threshold. The RESET one-shot asserts low for a fixed MR reset timeout period on the
CC
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 rises
CC
CC
above the threshold. For better noise immunity, bypass V
to GND with a 0.1µF capacitor.
CC
V
CC
V
TH
GND
SWITCH
BOUNCE
SWITCH
BOUNCE
SWITCH
BOUNCE
MR
GND
RESET
GND
t
RP
t
t
t
MRP
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
1.5kΩ pullup resistor to V
allows MR to be left uncon-
CC
The MAX6467 provides an active-low open-drain
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
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
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).
_______________________________________________________________________________________
5
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Reset Timeout Delay*
V
RESET TIMEOUT PERIOD
(min/max) (ms)
MR TIMEOUT PERIOD
MR RISING DEBOUNCE PERIOD
CC
RESET TIMEOUT SUFFIX
(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
CC
Applications Information
Falling V
Transients
V
to GND provides additional transient immunity.
CC
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 falling
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
V
transients (glitches). The Typical Operating
CC
CC
Characteristics section shows the Maximum Transient
Duration vs. V Overdrive for which the MAX6467/
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 appli-
CC
CC
cations, use 100kΩ to 1MΩ.
pulse. As the magnitude of the transient increases (goes
V
CC
V
CC
MAX6467
MAX6468
1.5kΩ
MR
V
CC
RESET
MR ONE-SHOT/
DEBOUNCE
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
Figure 2. Functional Diagram
TRANSISTOR COUNT: 748
PROCESS: BiCMOS
6
_______________________________________________________________________________________
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
(min)
V
(typ)
V
(max)
TH
TH
TH
MAX6467XS16D3
MAX6467XS22D3
MAX6467XS26D3
MAX6467XS29D3
MAX6467XS46D3
MAX6467US16D3
MAX6467US22D3
MAX6467US26D3
MAX6467US29D3
MAX6467US46D3
MAX6468XS16D3
MAX6468XS22D3
MAX6468XS26D3
MAX6468XS29D3
MAX6468XS46D3
MAX6468US16D3
MAX6468US22D3
MAX6468US26D3
MAX6468US29D3
MAX6468US46D3
AGL
AGM
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
AGN
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
AGO
AGP
KAFN
KAFO
KAFP
KAFQ
KAFR
AGQ
AGR
AGS
AGC
AGB
KAFS
KAFT
KAFU
KAEW
KAFV
Typical Operating Circuit
+1.0V TO +5.5V
V
V
CC
CC
MAX6467
MAX6468
RESET
INPUT
µP
MR
RESET
Pin Configurations (continued)
GND
GND
TOP VIEW
4
3
V
CC
1
2
GND
MAX6467US
MAX6468US
RESET
MR
SOT143
_______________________________________________________________________________________
7
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
8
_______________________________________________________________________________________
Microprocessor Supervisory Reset Circuits
with Edge-Triggered, One-Shot Manual Reset
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9
© 2002 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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