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19-1623; Rev 0; 1/00
4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input
General Description
The MAX6711/MAX6712/MAX6713 are microprocessor (P) supervisory circuits used to monitor the power supplies in P and digital systems. They provide excellent circuit reliability and low cost by eliminating external 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 VCC supply voltage declines below a preset threshold or whenever manual reset is asserted. Reset remains asserted for at least 140ms after VCC 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 VCC. The MAX6711/MAX6713 have an active-low reset output, while the MAX6712 has an active-high reset output. The reset comparator is designed to ignore fast transients on VCC, and the outputs are guaranteed to be in the correct logic state for VCC 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.
____________________________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 VCC = +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
Ordering Information
PART TEMP. RANGE PIN-PACKAGE MAX6711_EXS-T -40C to +125C 4 SC70-4 MAX6711_EXS-T10 -40C to +125C 4 SC70-4 MAX6712_EXS-T -40C to +125C 4 SC70-4 MAX6712_EXS-T10 -40C to +125C 4 SC70-4 MAX6713_EXS-T -40C to +125C 4 SC70-4 MAX6713_EXS-T10 -40C to +125C 4 SC70-4 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. Selector Guide appears at end of data sheet.
Applications
Computers Controllers Intelligent Instruments Critical P and C Power Monitoring Portable/Battery-Powered Equipment Automotive
Typical Operating Circuit
VCC VCC RPULL-UP* VCC
Pin Configuration
TOP VIEW
GND 1 4 VCC
MAX6711 MAX6713
PUSHBUTTON MR SWITCH GND RESET RESET INPUT
P
MAX6711 MAX6712 MAX6713
RESET (RESET) 2
GND
3
MR
*MAX6713 ONLY
( ) ARE FOR MAX6712.
SC70-4
________________________________________________________________ Maxim Integrated Products
1
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4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND) VCC ........................................................................-0.3V to +6.0V RESET, RESET (push-pull) .........................-0.3V to (VCC + 0.3V) RESET (open drain)...............................................-0.3V to +6.0V MR ..............................................................-0.3V to (VCC + 0.3V) Input Current, VCC, MR .......................................................20mA Output Current, RESET, RESET ..........................................20mA Rate of Rise, VCC ............................................................100V/s Continuous Power Dissipation (TA = +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
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
(VCC = full range, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = +5V for L/M versions, VCC = +3.3V for T/S versions, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25C.) (Note 1) PARAMETER VCC Range SYMBOL CONDITIONS TA = 0C to +70C TA = -40C to +125C TA = -40C to +85C Supply Current ICC TA = +85C to +125C MAX671_L VCC < 5.5V, MAX671_L/M VCC < 3.6V, MAX671_R/S/T/Z VCC < 5.5V, MAX671_L/M VCC < 3.6V, MAX671_R/S/T/Z TA = +25C TA = -40C to +85C TA = +85C to +125C TA = +25C MAX671_M TA = -40C to +85C TA = +85C to +125C TA = +25C MAX671_T Reset Threshold VTH MAX671_S TA = -40C to +85C TA = +85C to +125C TA = +25C TA = -40C to +85C TA = +85C to +125C TA = +25C MAX671_R TA = -40C to +85C TA = +85C to +125C TA = +25C MAX671_Z Reset Threshold Tempco VCC to Reset Delay (Note 2) Reset Active Timeout Period VCC = VTH to (VTH - 100mV) TA = -40C to +85C TA = +85C to +125C 140 100 TA = -40C to +85C TA = +85C to +125C 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 30 20 240 460 640 2.32 2.63 2.93 3.08 4.38 4.63 MIN 1.0 1.2 16 12 TYP MAX 5.5 5.5 35 30 60 60 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 ppm/C s ms V A UNITS V
2
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4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input
ELECTRICAL CHARACTERISTICS (continued)
(VCC = full range, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = +5V for L/M versions, VCC = +3.3V for T/S versions, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25C.) (Note 1) PARAMETER SYMBOL CONDITIONS VCC = VTH min, ISINK = 1.2mA, MAX6711R/S/T/Z, MAX6713R/S/T/Z RESET Output Voltage Low (MAX6711/MAX6713) VOL VCC = VTH min, ISINK = 3.2mA, MAX6711L/M, MAX6713L/M VCC > 1.0V, ISINK = 50A RESET Output Voltage High (MAX6711) VCC > VTH max, ISOURCE = 500A, MAX6711R/S/T/Z VOH VCC > VTH max, ISOURCE = 800A, MAX6711L/M VCC = VTH max, ISINK = 1.2mA, MAX6712R/S/T/Z VOL VCC = VTH max, ISINK = 3.2mA, MAX6712L/M 1.8V < VCC < VTH min, ISOURCE = 150A VCC > VTH, RESET deasserted VIL VIH 10 1 100 200 20 0.3 * VCC 0.7 * VCC 0.8 * VCC 1 0.8 * VCC V 0.8 * VCC 0.3 V 0.4 V A V k s ns ns MIN TYP MAX 0.3 0.4 0.3 V UNITS
MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
RESET Output Voltage Low (MAX6712)
RESET Output Voltage High (MAX6712) RESET Open-Drain Output Leakage Current MR Input Threshold MR Pull-Up Resistance MR Minimum Pulse Width MR Glitch Immunity MR to Reset Delay
VOH
Note 1: Production testing done at TA = +25C; limits over temperature guaranteed by design only. Note 2: RESET output for MAX6711/MAX6713; RESET output for MAX6712.
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4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
Typical Operating Characteristics
(VCC = full range, TA = -40C to +125C, unless otherwise noted. Typical values are at VCC = +5V for L/M versions, VCC = +3.3V for T/S versions, VCC = +3V for R version, VCC = +2.5V for Z version, and TA = +25C.)
SUPPLY CURRENT vs. TEMPERATURE (NO LOAD)
MAX6711/12/13 toc01
MAX671_R/S/T/Z POWER-DOWN RESET DELAY vs. TEMPERATURE
MAX6711/12/13-TOC2
MAX671_L/M POWER-DOWN RESET DELAY vs. TEMPERATURE
VOD = 10mV POWER-DOWN RESET DELAY (s) 150 120 VOD = 20mV 90 60 30 0 -40 -20 VOD = 100mV VOD = 200mV 0 20 40 60 80 TEMPERATURE (C) 100 120
MAX6711/12/13-TOC3
15
80 VOD = 10mV POWER-DOWN RESET DELAY (s) 60 VOD = 20mV 40
180
MAX671_L/M, VCC = 5V SUPPLY CURRENT (A) 10 MAX671 _Z, VCC = 2.5V MAX671 _R/S/T, VCC = 3.3V
5 MAX671 _L/M/R/S/T/Z, VCC = 1V 0 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
20
VOD = 100mV VOD = 200mV 0 20 40 60 80 100 120
0 -40 -20
TEMPERATURE (C)
POWER-UP RESET TIMEOUT vs. TEMPERATURE
MAX6711/12/13-TOC4
RESET THRESHOLD vs. TEMPERATURE
VTH = 4.63V
MAX6711/12/13-TOC5
300 POWER-UP RESET TIMEOUT (ms)
1.001
RESET THRESHOLD (V)
275 MAX671_ R/S/T/Z 250
1.000
0.999
225 MAX671_ L/M 200 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C) 0.998 -40 -20 0 20 40 60 80 100 120 TEMPERATURE (C)
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4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input
_____________________Pin Description
PIN 1 NAME GND RESET (MAX6711/ MAX6713) 2 RESET (MAX6712) Ground RESET Output remains low while VCC is below the reset threshold, and for at least 140ms after VCC rises above the reset threshold. RESET Output remains high while VCC is below the reset threshold, and for at least 140ms after VCC rises above the 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 CMOSlogic line, or shorted to ground with a switch. Leave open or connect to VCC if unused. Supply Voltage (+5.0V, +3.3V, +3.0V, or +2.5V) MAX6711
RESET MR GND R1 100k
MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
FUNCTION
VCC
Figure 2. RESET Valid to VCC = Ground Circuit
3
MR
least 140ms after VCC has risen above the reset threshold. 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 capability, 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/collector outputs. To create a manual reset function, connect 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.
4
VCC
400 MAXIMUM TRANSIENT DURATION (s) TA = +25C 320
240
160 MAX671_L/M 80 MAX671_R/S/T/Z 0 1 10 100 1000 RESET COMPARATOR OVERDRIVE, VTH - VCC (mV)
Applications Information
Negative-Going VCC 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-duration negative-going VCC transients (glitches). Figure 1 shows typical transient duration vs. reset comparator overdrive, for which the MAX6711/MAX6712/ MAX6713 do not generate a reset pulse. The graph was generated using a negative-going pulse applied to VCC, starting 0.5V above the actual reset threshold and ending below it by the magnitude indicated (reset comparator overdrive). The graph indicates the maximum pulse width a negative-going VCC transient can have without causing a reset pulse. As the magnitude of the transient increases (goes farther below the reset threshold), the
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Figure 1. Maximum Transient Duration Without Causing a Reset Pulse vs. Reset Comparator Overdrive
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 powerup, power-down, or brownout conditions. They assert a reset signal whenever the VCC supply voltage declines below a preset threshold, keeping it asserted for at
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4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
VCC +3.3V +5.0V
VCC
VCC
VCC RPULLUP
VCC
MAX6713
RESET
P
MOTOROLA RESET 68HCXX INPUT
5V SYSTEM
RESET INPUT
MAX6713
RESET
MR GND GND GND GND
Figure 3. Interfacing to Ps with Bidirectional Reset I/O
Figure 4. MAX6713 Open-Drain RESET Output Allows Use with Multiple Supplies
maximum allowable pulse width decreases. Typically, for the MAX671_L and MAX671_M, a VCC transient that goes 100mV below the reset threshold and lasts 20s or less will not cause a reset pulse. A 0.1F bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity.
MAX6713 Open-Drain RESET Output Allows Use with Multiple Supplies
Generally, the pull-up connected to the MAX6713 will connect to the supply voltage that is being monitored at the IC's VCC pin. However, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply (Figure 4). Note that as the MAX6713's VCC decreases below 1V, so does the IC's ability to sink current at RESET. Also, with any pull-up, RESET will be pulled high as VCC decays toward 0. The voltage where this occurs depends on the pull-up resistor value and the voltage to which it is connected.
When VCC falls below 1V, the MAX6711 RESET output no longer sinks current--it becomes an open circuit. Therefore, high-impedance CMOS-logic inputs connected to RESET can drift to undetermined voltages. This presents no problem in most applications since most P and other circuitry is inoperative with V CC 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 VCC is also recommended for the MAX6712 if RESET is required to remain valid for VCC < 1V.
Ensuring a Valid Reset Output Down to VCC = 0
Benefits of Highly Accurate Reset Threshold
Most P supervisor ICs have reset threshold voltages between 5% and 10% below the value of nominal supply voltages. This ensures a reset will not occur within 5% of the nominal supply, but will occur when the supply is 10% below nominal. 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. 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.
Interfacing to Ps with Bidirectional Reset Pins
Since the RESET output on the MAX6713 is open-drain, this device interfaces easily with Ps that have bidirectional reset pins, such as the Motorola 68HC11. Connecting the P supervisor's RESET output directly to the P's RESET pin with a single pull-up resistor allows either device to assert reset (Figure 3).
___________________Chip Information
TRANSISTOR COUNT: 380
6
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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) 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 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 AAF AAG AAH AAI AAJ AAK AAL AAM AAN AAO AAP AAQ AAR AAS
MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
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4-Pin SC70 Microprocessor Reset Circuits with Manual Reset Input MAX6711L/M/R/S/T/Z, MAX6712L/M/R/S/T/Z, MAX6713L/M/R/S/T/Z
Package Information
SC70, 4L.EPS
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 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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