MAX6713T [MAXIM]
4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input; 4引脚SC70封装的微处理器复位电路，带有手动复位输入
| 型号： | MAX6713T |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input |
| 文件： | 总8页 (文件大小：147K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1623; Rev 0; 1/00
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
General Description
____________________________Features
ꢀ Precision Monitoring of 2.5V, 3.0V, 3.3V, and 5.0V
The MAX6711/MAX6712/MAX6713 are microprocessor
(µP) supervisory circuits used to monitor the power
supplies in µP and digital systems. They provide excel-
lent circuit reliability and low cost by eliminating exter-
nal components and adjustments when used with
+5.0V, +3.3V, +3.0V, or +2.5V-powered circuits. They
also provide a debounced manual reset input.
Power-Supply Voltages
ꢀ Fully Specified Over Temperature
ꢀ Available in Three Output Configurations
Push-Pull RESET Output (MAX6711)
Push-Pull RESET Output (MAX6712)
Open-Drain RESET Output (MAX6713)
ꢀ 140ms min Power-On Reset Pulse Width
ꢀ Manual Reset Input
These circuits assert a reset signal whenever the V
CC
supply voltage declines below a preset threshold or
whenever manual reset is asserted. Reset remains
asserted for at least 140ms after V
has risen above
CC
ꢀ 12µA Supply Current
the reset threshold or when manual reset is deasserted.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
ꢀ Guaranteed Reset Valid to VCC = +1V
ꢀ Power-Supply Transient Immunity
ꢀ No External Components
The MAX6713 has an open-drain output stage, while
the MAX6711/MAX6712 have push-pull outputs. The
MAX6713’s open-drain RESET output requires a pull-up
resistor that can be connected to a voltage higher than
ꢀ 4-Pin SC70 Package
V
CC
. The MAX6711/MAX6713 have an active-low reset
Ordering Information
output, while the MAX6712 has an active-high reset out-
put. The reset comparator is designed to ignore fast
PART
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
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
4 SC70-4
transients on V , and the outputs are guaranteed to
CC
MAX6711_EXS-T
MAX6711_EXS-T10
MAX6712_EXS-T
MAX6712_EXS-T10
MAX6713_EXS-T
MAX6713_EXS-T10
be in the correct logic state for V
down to 1V.
CC
Low supply current makes the MAX6711/MAX6712/
MAX6713 ideal for use in portable equipment. These
devices are available in a 4-pin SC70 package.
Applications
Note: These parts are offered in 2.5k or 10k reels and must be
ordered in 2.5k or 10k increments. Order MAX6711_EXS-T for
2.5k reels and MAX6711_EXS-T10 for 10k reels. Insert the
desired suffix letter from the Selector Guide into the blank to
complete the part number.
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Automotive
Selector Guide appears at end of data sheet.
Typical Operating Circuit
Pin Configuration
TOP VIEW
V
CC
V
V
CC
CC
1
2
V
CC
GND
4
R
*
PULL-UP
MAX6711
MAX6713
P
MAX6711
MAX6712
MAX6713
RESET
INPUT
RESET
PUSHBUTTON
SWITCH
MR
RESET (RESET)
GND
GND
3
MR
SC70-4
( ) ARE FOR MAX6712.
*MAX6713 ONLY
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature: www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
Rate of Rise, V
............................................................100V/µs
CC
V
CC
........................................................................-0.3V to +6.0V
Continuous Power Dissipation (T = +70°C)
A
4-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
RESET, RESET (push-pull) .........................-0.3V to (V
RESET (open drain)...............................................-0.3V to +6.0V
MR ..............................................................-0.3V to (V + 0.3V)
+ 0.3V)
CC
CC
Input Current, V , MR.......................................................20mA
CC
Output Current, RESET, RESET ..........................................20mA
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
= full range, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
= +5V for L/M versions, V = +3.3V for
CC
CC
A
CC
T/S versions, V
= +3V for R version, V
= +2.5V for Z version, and T = +25°C.) (Note 1)
CC
CC
A
PARAMETER
Range
SYMBOL
CONDITIONS
MIN
1.0
TYP
MAX
5.5
UNITS
T
T
= 0°C to +70°C
A
V
CC
V
= -40°C to +125°C
1.2
5.5
A
V
< 5.5V, MAX671_L/M
< 3.6V, MAX671_R/S/T/Z
< 5.5V, MAX671_L/M
< 3.6V, MAX671_R/S/T/Z
16
12
35
CC
CC
T
= -40°C to
A
+85°C
V
30
Supply Current
I
µA
CC
V
60
CC
CC
T
A
= +85°C to
+125°C
V
60
T
= +25°C
4.56
4.50
4.44
4.31
4.25
4.20
3.04
3.00
2.95
2.89
2.85
2.81
2.59
2.55
2.52
2.28
2.25
2.22
4.63
4.38
3.08
2.93
2.63
2.32
4.70
4.75
4.82
4.45
4.50
4.56
3.11
3.15
3.21
2.96
3.00
3.05
2.66
2.70
2.74
2.35
2.38
2.42
A
A
A
A
MAX671_L
T
T
T
= -40°C to +85°C
= +85°C to +125°C
= +25°C
MAX671_M
MAX671_T
MAX671_S
MAX671_R
MAX671_Z
T
T
T
= -40°C to +85°C
= +85°C to +125°C
= +25°C
A
A
A
A
A
A
A
A
A
A
A
A
A
A
T
T
T
= -40°C to +85°C
= +85°C to +125°C
= +25°C
Reset Threshold
V
TH
V
T
T
T
T
T
T
= -40°C to +85°C
= +85°C to +125°C
= +25°C
= -40°C to +85°C
= +85°C to +125°C
= +25°C
T
T
= -40°C to +85°C
= +85°C to +125°C
Reset Threshold Tempco
30
20
ppm/°C
µs
V
CC
to Reset Delay (Note 2)
V = V to (V - 100mV)
CC TH TH
T
A
T
A
= -40°C to +85°C
140
100
240
460
640
Reset Active Timeout Period
ms
= +85°C to +125°C
2
_______________________________________________________________________________________
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
ELECTRICAL CHARACTERISTICS (continued)
(V
= full range, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
= +5V for L/M versions, V = +3.3V for
CC
CC
A
CC
T/S versions, V
= +3V for R version, V
= +2.5V for Z version, and T = +25°C.) (Note 1)
CC
CC
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
= V min, I
= 1.2mA,
SINK
CC
TH
0.3
MAX6711R/S/T/Z, MAX6713R/S/T/Z
V = V min, I = 3.2mA,
CC
RESET Output Voltage Low
(MAX6711/MAX6713)
V
OL
V
TH
SINK
0.4
0.3
MAX6711L/M, MAX6713L/M
V
V
> 1.0V, I
= 50µA
CC
SINK
> V max, I
= 500µA,
= 800µA,
CC
TH
SOURCE
0.8 · V
0.8 · V
CC
MAX6711R/S/T/Z
RESET Output Voltage High
(MAX6711)
V
V
V
OH
V
CC
> V max, I
TH
SOURCE
CC
MAX6711L/M
V
= V max, I
= 1.2mA,
CC
TH
SINK
SINK
0.3
0.4
MAX6712R/S/T/Z
RESET Output Voltage Low
(MAX6712)
V
OL
V
CC
= V max, I
= 3.2mA,
TH
MAX6712L/M
RESET Output Voltage High
(MAX6712)
V
1.8V < V < V min, I
= 150µA
0.8 · V
0.3 · V
V
µA
V
OH
CC
TH
SOURCE
CC
RESET Open-Drain Output
Leakage Current
1
V
CC
> V , RESET deasserted
TH
V
IL
CC
MR Input Threshold
V
0.7 · V
CC
IH
10
1
20
k
MR Pull-Up Resistance
MR Minimum Pulse Width
MR Glitch Immunity
µs
ns
ns
100
200
MR to Reset Delay
Note 1: Production testing done at T = +25°C; limits over temperature guaranteed by design only.
A
Note 2: RESET output for MAX6711/MAX6713; RESET output for MAX6712.
_______________________________________________________________________________________
3
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
Typical Operating Characteristics
(V
= full range, T = -40°C to +125°C, unless otherwise noted. Typical values are at V
= +5V for L/M versions, V
= +3.3V for
CC
A
CC
CC
T/S versions, V
= +3V for R version, V = +2.5V for Z version, and T = +25°C.)
CC A
CC
MAX671_L/M
POWER-DOWN RESET DELAY vs. TEMPERATURE
MAX671_R/S/T/Z
POWER-DOWN RESET DELAY vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
(NO LOAD)
80
180
15
10
5
V
= 10mV
OD
V
= 10mV
OD
150
120
MAX671_L/M, V = 5V
CC
60
40
20
0
MAX671 _Z, V = 2.5V
CC
V
= 20mV
OD
V
= 20mV
OD
MAX671 _R/S/T, V = 3.3V
CC
90
60
30
0
V
= 100mV
OD
V
= 100mV
OD
MAX671 _L/M/R/S/T/Z, V = 1V
CC
V
= 200mV
OD
V
= 200mV
OD
0
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
-40 -20
0
20 40 60 80 100 120
-40 -20
0
20 40 60 80 100 120
TEMPERATURE ( C)
TEMPERATURE (°C)
POWER-UP RESET TIMEOUT vs.
TEMPERATURE
RESET THRESHOLD vs. TEMPERATURE
300
275
250
1.001
1.000
0.999
0.998
V
= 4.63V
TH
MAX671_ R/S/T/Z
225
200
MAX671_ L/M
-40 -20
0
20 40
60 80 100 120
-40 -20
0
20 40 60 80 100 120
TEMPERATURE (°C)
TEMPERATURE (°C)
4
_______________________________________________________________________________________
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
_____________________Pin Description
PIN
NAME
FUNCTION
V
CC
1
GND
Ground
RESET Output remains low while V
is below the reset threshold, and for at
CC
MAX6711
RESET
(MAX6711/
MAX6713)
RESET
least 140ms after V
reset threshold.
rises above the
CC
MR
2
R1
100k
RESET Output remains high while V
is below the reset threshold, and for at
CC
GND
RESET
(MAX6712)
least 140ms after V
rises above the
CC
reset threshold.
Manual Reset Input. RESET (RESET)
remains asserted as long as MR is low,
and for at least 140ms after MR is
deasserted. This active-low input has
an internal 20k (typ) pull-up resistor.
It can be driven from a TTL- or CMOS-
logic line, or shorted to ground with a
Figure 2. RESET Valid to V
= Ground Circuit
CC
least 140ms after V
has risen above the reset thresh-
CC
old. The MAX6713 uses an open-drain output, and the
MAX6711/MAX6712 have a push-pull output stage.
Connect a pull-up resistor on the MAX6713’s RESET
output to any supply between 0 and 6V.
3
4
MR
switch. Leave open or connect to V
if unused.
CC
Manual Reset Input
Supply Voltage (+5.0V, +3.3V, +3.0V,
or +2.5V)
V
CC
Many µP-based systems require manual reset capabili-
ty, allowing the operator, a test technician, or external
logic circuitry to initiate a reset. Reset remains asserted
while MR is low, and for at least 140ms after MR returns
high. This input has an internal 20k pull-up resistor, so
it can be left open if it is not used. MR can be driven
with TTL- or CMOS-logic levels, or with open-drain/col-
lector outputs. To create a manual reset function, con-
nect a normally open momentary switch from MR to
ground; external debounce circuitry is not required. If
MR is driven from long cables or if the device is used in
a noisy environment, connecting a 0.1µF capacitor from
MR to ground provides additional noise immunity.
400
320
T = +25 C
A
240
160
80
MAX671_L/M
Applications Information
MAX671_R/S/T/Z
0
Negative-Going V
Transients
CC
1
10
100
1000
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, the MAX6711/
MAX6712/MAX6713 are relatively immune to short-dura-
RESET COMPARATOR OVERDRIVE, V - V (mV)
TH
CC
Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
tion negative-going V transients (glitches).
CC
Figure 1 shows typical transient duration vs. reset com-
parator overdrive, for which the MAX6711/MAX6712/
MAX6713 do not generate a reset pulse. The graph was
Detailed Description
generated using a negative-going pulse applied to V
,
CC
Reset Output
A microprocessor’s (µP’s) reset input starts the µP in a
known state. The MAX6711/MAX6712/MAX6713 assert
reset to prevent code-execution errors during power-
up, power-down, or brownout conditions. They assert a
starting 0.5V above the actual reset threshold and end-
ing below it by the magnitude indicated (reset compara-
tor overdrive). The graph indicates the maximum pulse
width a negative-going V
transient can have without
CC
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
reset signal whenever the V
supply voltage declines
CC
below a preset threshold, keeping it asserted for at
_______________________________________________________________________________________
5
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
+5.0V
+3.3V
V
CC
V
V
V
V
CC
CC
CC
CC
R
PULLUP
P
5V SYSTEM
MAX6713
MAX6713
MOTOROLA
68HCXX
RESET
INPUT
RESET
INPUT
RESET
RESET
MR
GND
GND
GND
GND
Figure 3. Interfacing to µPs with Bidirectional Reset I/O
Figure 4. MAX6713 Open-Drain RESET Output Allows Use with
Multiple Supplies
maximum allowable pulse width decreases. Typically, for
MAX6713 Open-Drain RESET Output
Allows Use with Multiple Supplies
the MAX671_L and MAX671_M, a V
transient that
CC
goes 100mV below the reset threshold and lasts 20µs or
Generally, the pull-up connected to the MAX6713 will
connect to the supply voltage that is being monitored at
less will not cause a reset pulse. A 0.1µF bypass capaci-
tor mounted as close as possible to the V pin provides
CC
the IC’s V
pin. However, some systems may use the
CC
additional transient immunity.
open-drain output to level-shift from the monitored sup-
ply to reset circuitry powered by some other supply
Ensuring a Valid Reset Output
(Figure 4). Note that as the MAX6713’s V
decreases
CC
Down to V
= 0
CC
below 1V, so does the IC’s ability to sink current at
When V
falls below 1V, the MAX6711 RESET output
CC
RESET. Also, with any pull-up, RESET will be pulled
no longer sinks current—it becomes an open circuit.
Therefore, high-impedance CMOS-logic inputs con-
nected to RESET can drift to undetermined voltages.
This presents no problem in most applications since
high as V
decays toward 0. The voltage where this
CC
occurs depends on the pull-up resistor value and the
voltage to which it is connected.
most µP and other circuitry is inoperative with V
CC
Benefits of Highly Accurate
Reset Threshold
Most µP supervisor ICs have reset threshold voltages
between 5% and 10% below the value of nominal sup-
ply voltages. This ensures a reset will not occur within
5% of the nominal supply, but will occur when the sup-
ply is 10% below nominal.
below 1V. However, in applications where RESET must
be valid down to 0, adding a pull-down resistor to
RESET causes any stray leakage currents to flow to
ground, holding RESET low (Figure 2). R1’s value is not
critical; 100k is large enough not to load RESET and
small enough to pull RESET to ground.
A 100k pull-up resistor to V
is also recommended
CC
When using ICs rated at only the nominal supply 5%,
a zone of uncertainty where the supply is between 5%
and 10% low, and where the reset may or may not be
asserted is left.
for the MAX6712 if RESET is required to remain valid for
V
CC
< 1V.
Interfacing to µPs with
Bidirectional Reset Pins
The MAX671_L/T/Z use highly accurate circuitry to
ensure that reset is asserted close to the 5% limit, and
long before the supply has declined to 10% below
nominal.
Since the RESET output on the MAX6713 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 µP’s RESET pin with a single pull-up resistor
allows either device to assert reset (Figure 3).
___________________Chip Information
TRANSISTOR COUNT: 380
6
_______________________________________________________________________________________
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
Selector Guide
PART/SUFFIX
MAX6711L
MAX6711M
MAX6711T
MAX6711S
MAX6711R
MAX6711Z
MAX6712L
MAX6712M
MAX6712T
MAX6712S
MAX6712R
MAX6712Z
MAX6713L
MAX6713M
MAX6713T
MAX6713S
MAX6713R
MAX6713Z
RESET THRESHOLD (V)
OUTPUT TYPE
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Push-Pull RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
Open-Drain RESET
TOP MARK
AAB
AAC
AAD
AAE
4.63
4.38
3.08
2.93
2.63
2.32
4.63
4.38
3.08
2.93
2.63
2.32
4.63
4.38
3.08
2.93
2.63
2.32
AAF
AAG
AAH
AAI
AAJ
AAK
AAL
AAM
AAN
AAO
AAP
AAQ
AAR
AAS
_______________________________________________________________________________________
7
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
Package Information
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.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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