General Description
The MAX6711/MAX6712/MAX6713 are microprocessor
(P) supervisory circuits used to monitor the power
supplies in P 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.
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
CC
has risen above
the reset threshold or when manual reset is deasserted.
Reset thresholds suitable for operation with a variety of
supply voltages are available.
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
V
CC
. The MAX6711/MAX6713 have an active-low reset
output, while the MAX6712 has an active-high reset out-
put. The reset comparator is designed to ignore fast
transients on V
CC
, and the outputs are guaranteed to
be in the correct logic state for V
CC
down to 1V.
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
Computers
Controllers
Intelligent Instruments
Critical P and C Power Monitoring
Portable/Battery-Powered Equipment
Automotive
____________________________Features
o Precision Monitoring of 2.5V, 3.0V, 3.3V, and 5.0V
Power-Supply Voltages
o Fully Specified Over Temperature
o Available in Three Output Configurations
Push-Pull RESET Output (MAX6711)
Push-Pull RESET Output (MAX6712)
Open-Drain RESET Output (MAX6713)
o 140ms min Power-On Reset Pulse Width
o Manual Reset Input
o 12A Supply Current
o Guaranteed Reset Valid to V
CC
= +1V
o Power-Supply Transient Immunity
o No External Components
o 4-Pin SC70 Package
MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
________________________________________________________________ Maxim Integrated Products
1
19-1623; Rev 0; 1/00
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.
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 SC70-4
-40C to +125C
MAX6711_EXS-T10
4 SC70-4
PIN-PACKAGE
TEMP. RANGE
-40C to +125C
MAX6711_EXS-T
PART
4 SC70-4
-40C to +125C
MAX6712_EXS-T10
4 SC70-4
-40C to +125C
MAX6712_EXS-T
4 SC70-4
-40C to +125C
MAX6713_EXS-T10
4 SC70-4
-40C to +125C
MAX6713_EXS-T
Ordering Information
TOP VIEW
RESET (RESET)
1
GND
V
CC
MAX6711
MAX6712
MAX6713
SC70-4
2
4
MR
3
( ) ARE FOR MAX6712.
MAX6711
MAX6713
V
CC
V
CC
R
PULL-UP
*
RESET
RESET
INPUT
GND
MR
V
CC
GND
*MAX6713 ONLY
PUSHBUTTON
SWITCH
P
Pin Configuration
Typical Operating Circuit
Selector Guide appears at end of data sheet.
MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= full range, T
A
= -40C to +125C, unless otherwise noted. Typical values are at V
CC
= +5V for L/M versions, V
CC
= +3.3V for
T/S versions, V
CC
= +3V for R version, V
CC
= +2.5V for Z version, and T
A
= +25C.) (Note 1)
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.
Terminal Voltage (with respect to GND)
V
CC
........................................................................-0.3V to +6.0V
RESET, RESET (push-pull) .........................-0.3V to (V
CC
+ 0.3V)
RESET (open drain)...............................................-0.3V to +6.0V
MR ..............................................................-0.3V to (V
CC
+ 0.3V)
Input Current, V
CC
, MR .......................................................20mA
Output Current, RESET, RESET ..........................................20mA
Rate of Rise, V
CC
............................................................100V/s
Continuous Power Dissipation (T
A
= +70C)
4-Pin SC70 (derate 3.1mW/C above +70C) ..............245mW
Operating Temperature Range .........................-40C to +125C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
100
640
T
A
= +85C to +125C
T
A
= -40C to +125C
T
A
= 0C to +70C
T
A
= +85C to
+125C
T
A
= -40C to
+85C
MAX671_L
CONDITIONS
2.22
2.42
4.50
4.75
V
4.56
4.63
4.70
V
TH
Reset Threshold
1.2
5.5
V
1.0
5.5
V
CC
Range
60
60
12
30
16
35
I
CC
Supply Current
V
CC
< 5.5V, MAX671_L/M
V
CC
< 3.6V, MAX671_R/S/T/Z
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
CC
< 5.5V, MAX671_L/M
MAX671_R
2.59
2.63
2.66
T
A
= +25C
V
CC
< 3.6V, MAX671_R/S/T/Z
T
A
= +25C
T
A
= -40C to +85C
MAX671_M
4.25
4.50
2.55
2.70
T
A
= -40C to +85C
MAX671_Z
2.25
2.38
2.28
2.32
2.35
2.52
2.74
T
A
= +85C to +125C
T
A
= +25C
T
A
= -40C to +85C
4.31
4.38
4.45
4.44
4.82
T
A
= +85C to +125C
T
A
= +25C
T
A
= -40C to +85C
MAX671_T
3.04
3.08
3.11
4.20
4.56
T
A
= +85C to +125C
T
A
= +25C
3.00
3.15
T
A
= -40C to +85C
2.95
3.21
T
A
= +85C to +125C
MAX671_S
2.81
3.05
2.85
3.00
2.89 2.93
2.96
T
A
= +25C
T
A
= -40C to +85C
T
A
= +85C to +125C
T
A
= +85C to +125C
A
Reset Threshold Tempco
ms
s
ppm/C
140
240
460
20
30
T
A
= -40C to +85C
V
CC
= V
TH
to (V
TH
- 100mV)
Reset Active Timeout Period
V
CC
to Reset Delay (Note 2)
MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
_______________________________________________________________________________________
3
Note 1: Production testing done at T
A
= +25C; limits over temperature guaranteed by design only.
Note 2: RESET output for MAX6711/MAX6713; RESET output for MAX6712.
CONDITIONS
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
V
CC
= V
TH
max, I
SINK
= 3.2mA,
MAX6712L/M
V
CC
= V
TH
max, I
SINK
= 1.2mA,
MAX6712R/S/T/Z
V
CC
> V
TH
max, I
SOURCE
= 800A,
MAX6711L/M
V
CC
> V
TH
max, I
SOURCE
= 500A,
MAX6711R/S/T/Z
V
CC
= V
TH
min, I
SINK
= 1.2mA,
MAX6711R/S/T/Z, MAX6713R/S/T/Z
V
CC
= V
TH
min, I
SINK
= 3.2mA,
MAX6711L/M, MAX6713L/M
V
CC
> V
TH
, RESET deasserted
V
CC
> 1.0V, I
SINK
= 50A
1.8V < V
CC
< V
TH
min, I
SOURCE
= 150A
A
1
RESET Open-Drain Output
Leakage Current
V
0.8 V
CC
V
OH
RESET Output Voltage High
(MAX6712)
0.4
V
0.3
V
OL
RESET Output Voltage Low
(MAX6712)
0.8 V
CC
V
0.8 V
CC
V
OH
RESET Output Voltage High
(MAX6711)
V
0.3
V
OL
RESET Output Voltage Low
(MAX6711/MAX6713)
0.4
0.3
V
0.3 V
CC
V
IL
MR Input Threshold
V
IH
0.7 V
CC
k
10
20
MR Pull-Up Resistance
1
MR Minimum Pulse Width
s
ns
100
MR Glitch Immunity
200
MR to Reset Delay
ns
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= full range, T
A
= -40C to +125C, unless otherwise noted. Typical values are at V
CC
= +5V for L/M versions, V
CC
= +3.3V for
T/S versions, V
CC
= +3V for R version, V
CC
= +2.5V for Z version, and T
A
= +25C.) (Note 1)
MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
4
_______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= full range, T
A
= -40C to +125C, unless otherwise noted. Typical values are at V
CC
= +5V for L/M versions, V
CC
= +3.3V for
T/S versions, V
CC
= +3V for R version, V
CC
= +2.5V for Z version, and T
A
= +25C.)
200
POWER-UP RESET TIMEOUT vs.
TEMPERATURE
300
MAX6711/12/13-TOC4
TEMPERATURE (C)
POWER-UP RESET TIMEOUT (ms)
250
225
275
-40
80
100 120
20
-20
0
60
40
MAX671_ L/M
MAX671_ R/S/T/Z
0.998
RESET THRESHOLD vs. TEMPERATURE
1.001
MAX6711/12/13-TOC5
TEMPERATURE (C)
RESET THRESHOLD (V)
1.000
0.999
-40
80
100
120
20
-20
0
60
40
V
TH
= 4.63V
0
MAX671_L/M
POWER-DOWN RESET DELAY vs. TEMPERATURE
120
150
180
MAX6711/12/13-TOC3
TEMPERATURE (C)
POWER-DOWN RESET DELAY (
s)
60
30
90
-40
80
100 120
20
-20
0
60
40
V
OD
= 10mV
V
OD
= 20mV
V
OD
= 200mV
V
OD
= 100mV
0
MAX671_R/S/T/Z
POWER-DOWN RESET DELAY vs. TEMPERATURE
80
MAX6711/12/13-TOC2
TEMPERATURE (C)
POWER-DOWN RESET DELAY (
s)
40
20
60
-40
80
100 120
20
-20
0
60
40
V
OD
= 10mV
V
OD
= 20mV
V
OD
= 200mV
V
OD
= 100mV
-40
20
40
-20
0
60
80
100 120
SUPPLY CURRENT vs. TEMPERATURE
(NO LOAD)
MAX6711/12/13 toc01
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
0
5
10
15
MAX671 _Z, V
CC
= 2.5V
MAX671_L/M, V
CC
= 5V
MAX671 _L/M/R/S/T/Z, V
CC
= 1V
MAX671 _R/S/T, V
CC
= 3.3V
MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
_______________________________________________________________________________________
5
Detailed Description
Reset Output
A microprocessor's (P's) reset input starts the P 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
reset signal whenever the V
CC
supply voltage declines
below a preset threshold, keeping it asserted for at
least 140ms after V
CC
has risen above the reset thresh-
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.
Manual Reset Input
Many P-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 0.1F capacitor from
MR to ground provides additional noise immunity.
Applications Information
Negative-Going V
CC
Transients
In addition to issuing a reset to the P during power-up,
power-down, and brownout conditions, the MAX6711/
MAX6712/MAX6713 are relatively immune to short-dura-
tion negative-going V
CC
transients (glitches).
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
generated using a negative-going pulse applied to V
CC
,
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
CC
transient can have without
causing a reset pulse. As the magnitude of the transient
increases (goes farther below the reset threshold), the
4-Pin SC70 Microprocessor Reset Circuits
with Manual Reset Input
R1
100k
V
CC
GND
MR
MAX6711
RESET
Figure 2. RESET Valid to V
CC
= Ground Circuit
2
RESET
(MAX6711/
MAX6713)
RESET Output remains low while V
CC
is below the reset threshold, and for at
least 140ms after V
CC
rises above the
reset threshold.
1
GND
Ground
PIN
NAME
FUNCTION
RESET
(MAX6712)
RESET Output remains high while V
CC
is below the reset threshold, and for at
least 140ms after V
CC
rises above the
reset threshold.
_____________________Pin Description
400
320
0
1
100
1000
160
80
240
RESET COMPARATOR OVERDRIVE, V
TH
- V
CC
(mV)
MAXIMUM TRANSIENT DURATION (
s)
10
T
A
= +25
C
MAX671_L/M
MAX671_R/S/T/Z
Figure 1. Maximum Transient Duration Without Causing a
Reset Pulse vs. Reset Comparator Overdrive
3
MR
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
switch. Leave open or connect to V
CC
if unused.
4
V
CC
Supply Voltage (+5.0V, +3.3V, +3.0V,
or +2.5V)
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