AVAILABLE
Functional Diagrams
Pin Configurations appear at end of data sheet.
Functional Diagrams continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
Low-Cost, µP Supervisory Circuits
TOP VIEW
1
2
3
4
8
7
6
5
WDO
RESET (RESET)
WDI
PFO
PFI
GND
VCC
MR
DIP/SO
MAX705
MAX706
MAX813L
1
2
3
4
8
7
6
5
RESET
RESET
N.C.
PFO
PFI
GND
VCC
MR
DIP/SO
MAX707
MAX708
( ) ARE FOR MAX813L ONLY.
Pin Configurations continued at end of data sheet.
_________________Pin Configurations
VCC
PFI
MR PFO
WDO
RESET
UNREGULATED DC
PUSHBUTTON
SWITCH
PFI
I/O LINE
INTERRUPT
µP
MAX705
MAX706
MAX813L
MAX667
+5V DC LINEAR
REGULATOR
VCC
RESET
NMI
__________Typical Operating Circuit
_______________General Description
The MAX705-MAX708/MAX813L microprocessor (µP)
supervisory circuits reduce the complexity and number
of components required to monitor power-supply and
battery functions in µP systems. These devices signifi-
cantly improve system reliability and accuracy com-
pared to separate ICs or discrete components.
The MAX705/MAX706/MAX813L provide four functions:
1) A reset output during power-up, power-down, and
brownout conditions.
2) An independent watchdog output that goes low if
the watchdog input has not been toggled within 1.6
seconds.
3) A 1.25V threshold detector for power-fail warning,
low-battery detection, or for monitoring a power sup-
ply other than +5V.
4) An active-low manual-reset input.
The MAX707/MAX708 are the same as the MAX705/
MAX706, except an active-high reset is substituted for
the watchdog timer. The MAX813L is the same as the
MAX705, except RESET is provided instead of RESET.
Two supply-voltage monitor levels are available: The
MAX705/MAX707/MAX813L generate a reset pulse when
the supply voltage drops below 4.65V, while the
MAX706/MAX708 generate a reset pulse below 4.40V.
All four parts are available in 8-pin DIP, SO and µMAX®
packages.
_______________________Applications
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
___________________________Features
oAvailable in Tiny µMAX Package
oGuaranteed RESET Valid at VCC = 1V
oPrecision Supply-Voltage Monitor
4.65V in MAX705/MAX707/MAX813L
4.40V in MAX706/MAX708
o200ms Reset Pulse Width
oDebounced TTL/CMOS-Compatible
Manual-Reset Input
oIndependent Watchdog Timer—1.6s Timeout
(MAX705/MAX706)
oActive-High Reset Output
(MAX707/MAX708/MAX813L)
oVoltage Monitor for Power-Fail or Low-Battery
Warning
______________Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX705CPA 8 Plastic DIP
MAX705CSA 0°C to +70°C 8 SO
MAX705C/D 0°C to +70°C Dice*
Ordering Information continued at end of data sheet.
*
Dice are specified at TA= +25°C.
**
Contact factory for availability and processing to MIL-STD-883.
Devices in PDIP, SO and µMAX packages are available in both
leaded and lead-free packaging. Specify lead free by adding
the + symbol at the end of the part number when ordering.
Lead-free not available for CERDIP package.
0°C to +70°C
MAX705CUA 0°C to +70°C 8 µMAX
µMAX is a registered trademark of Maxim Integrated Products, Inc.
__________Typical Operating Circuit
19-4334; Rev. 8; 3/10
_______________General Description
The MAX705-MAX708/MAX813L microprocessor (µP)
supervisory circuits reduce the complexity and number
of components required to monitor power-supply and
battery functions in µP systems. These devices signifi-
cantly improve system reliability and accuracy com-
pared to separate ICs or discrete components.
The MAX705/MAX706/MAX813L provide four functions:
1) A reset output during power-up, power-down, and
brownout conditions.
2) An independent watchdog output that goes low if
the watchdog input has not been toggled within 1.6
seconds.
3) A 1.25V threshold detector for power-fail warning,
low-battery detection, or for monitoring a power sup-
ply other than +5V.
4) An active-low manual-reset input.
The MAX707/MAX708 are the same as the MAX705/
MAX706, except an active-high reset is substituted for
the watchdog timer. The MAX813L is the same as the
MAX705, except RESET is provided instead of RESET.
Two supply-voltage monitor levels are available: The
MAX705/MAX707/MAX813L generate a reset pulse when
the supply voltage drops below 4.65V, while the
MAX706/MAX708 generate a reset pulse below 4.40V.
All four parts are available in 8-pin DIP, SO and µMAX®
packages.
_______________________Applications
Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring
___________________________Features
oAvailable in Tiny µMAX Package
oGuaranteed RESET Valid at VCC = 1V
oPrecision Supply-Voltage Monitor
4.65V in MAX705/MAX707/MAX813L
4.40V in MAX706/MAX708
o200ms Reset Pulse Width
oDebounced TTL/CMOS-Compatible
Manual-Reset Input
oIndependent Watchdog Timer—1.6s Timeout
(MAX705/MAX706)
oActive-High Reset Output
(MAX707/MAX708/MAX813L)
oVoltage Monitor for Power-Fail or Low-Battery
Warning
______________Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX705CPA 8 Plastic DIP
MAX705CSA 0°C to +70°C 8 SO
MAX705C/D 0°C to +70°C Dice*
Ordering Information continued at end of data sheet.
*
Dice are specified at TA= +25°C.
**
Contact factory for availability and processing to MIL-STD-883.
Devices in PDIP, SO and µMAX packages are available in both
leaded and lead-free packaging. Specify lead free by adding
the + symbol at the end of the part number when ordering.
Lead-free not available for CERDIP package.
0°C to +70°C
MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
Terminal Voltage (with respect to GND)
VCC .............................................. -0.3V to 6.0V
All Other Inputs (Note 1) ............... -0.3V to (VCC + 0.3V)
Input Current
VCC ...................................................... 20mA
GND .................................................... 20mA
Output Current (all outputs) ............................. 20mA
Continuous Power Dissipation (TA= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C) ....... 727mW
SO (derate 5.88mW/°C above +70°C) ............... 471mW
µMAX (derate 4.10mW/°C above +70°C) ............ 330mW
CERDIP (derate 8.00mW/°C above +70°C) .......... 640mW
Operating Temperature Ranges
MAX70_C__, MAX813LC__ .................... 0°C to +70°C
MAX70_E__, MAX813LE__ ................... -40°C to +85°C
MAX70_MJA ................................ -55°C to +125°C
Storage Temperature Range ................ -65°C to +160°C
Lead Temperature (soldering, 10s) ................... +300°C
Soldering Temperature (reflow)
Lead(Pb)-free.................................................................+260°C
Containing Lead(Pb)......................................................+240°C
ELECTRICAL CHARACTERISTICS
(VCC = 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC = 4.5V to 5.5V for MAX706/MAX708, TA= TMIN to TMAX, unless otherwise noted.)
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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Operating Voltage Range VCC
MAX70_C 1.0 5.5
V
MAX813LC 1.1 5.5
MAX70_E/M, MAX813LE/M 1.2 5.5
Reset Threshold (Note 2) VRT
MAX705, MAX707, MAX813L 4.50 4.65 4.75
MAX706, MAX708 4.25 4.40 4.50
40 mV
Reset Pulse Width (Note 2) tRS 140 200 280 ms
RESET Output Voltage
ISOURCE = 800µA VCC - 1.5
V
ABSOLUTE MAXIMUM RATINGS
Note 1: The input voltage limits on PFI and MR can be exceeded if the input current is less than 10mA.
Reset Threshold Hysteresis (Note 2)
ISINK = 3.2mA 0.4
0.3
0.3
RESET Output Voltage
MAX707, MAX708, ISOURCE = 800µA
V
MAX707, MAX708, ISINK = 1.2mA 0.4
0.8
0.9
MAX813L VCC - 1.5
0.4
Watchdog Timeout Period tWD MAX705, MAX706, MAX813L 1.00 1.60 2.25 s
WDI Pulse Width tWP VIL = 0.4V, VIH = (VCC) (0.8) 50 ns
WDI Input Threshold 0.8 V
3.5
MAX70_C, VCC = 1V, ISINK = 50µA
MAX70_E/M, VCC = 1.2V, ISINK = 100µA
MAX813LC, ISOURCE = 4µA, VCC = 1.1V
MAX813LE/M, ISOURCE = 4µA, VCC = 1.2V
ISOURCE = 800µA
ISINK = 3.2mA
Low
High
WDI Input Current MAX705, MAX706, MAX813L, WDI = VCC 50 150 µA
MAX705, MAX706, MAX813L, WDI = 0V -150 -50
WDO Output Voltage
VCC - 1.5
V
0.4
MAX705, MAX706, MAX813L,
VCC = 5V
MAX705, MAX706, MAX813L,
ISOURCE = 800µA
MAX705, MAX706, MAX813L,
ISINK = 1.2mA
V
VCC - 1.5
MAX707C, MAX708C 50 350
MAX707E/M, MAX708E/M 50 500
Supply Current ISUPPLY
MAX705C, MAX706C, MAX813LC 150 350
µA
MAX705E/M, MAX706E/M, MAX813LE/M 150 500
2
MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC = 4.5V to 5.5V for MAX706/MAX708, TA= TMIN to TMAX, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
0.8 V
2.0
MR Pull-Up Current MR = 0V 100 250 600 µA
MR Pulse Width tMR 150 ns
Low
High
MR Input Threshold
MR to Reset Out Delay (Note 2) tMD 250 ns
PFI Input Threshold VCC = 5V 1.20 1.25 1.30 V
PFI Input Current -25.00 +0.01 +25.00 nA
PFO Output Voltage ISOURCE = 800µA VCC - 1.5 V
ISINK = 3.2mA 0.4
Note 2: Applies to both RESET in the MAX705–MAX708 and RESET in the MAX707/MAX708/MAX813L.
3
MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
__________________________________________Typical Operating Characteristics
MAX707/MAX708/MAX813L
RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
500ms/div
VCC
0V
RESET
0V
+5V
1V/div
+5V
1V/div
TA = +25°C
GND
RESET
VCC
330pF 10kΩ
MAX813L
RESET RESPONSE TIME
2µs/div
+5V
VCC
0V
0V
+4V
+4V
GND
RESET
VCC
330pF 10kΩ
MAX705/MAX707
RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
500ms/div
VCC
0V
RESET
0V
+5V
1V/div
+5V
1V/div
VCC
GND
RESET
VCC 2kΩ
RESET
330pF
TA = +25°C
MAX705/MAX707
RESET RESPONSE TIME
2µs/div
VCC
+5V
RESET
+5V
+4V
1V/div
0V
TA = +25°C
VCC
GND
RESET
VCC 10kΩ
RESET
30pF
POWER-FAIL COMPARATOR
DE-ASSERTION RESPONSE TIME
400ns/div
PFI
+1.20V
PFO
0V
+3V
+1.30V
VCC = +5V
TA = +25°C
+5V
PFO
30pF 1kΩ
+1.25V
PFI
POWER-FAIL COMPARATOR
ASSERTION RESPONSE TIME
400ns/div
PFI
+1.30V
PFO
+5V
0V
+1.20V
1V/div 50mV/div
+5V
PFO
30pF
1kΩ
+1.25V
PFI
VCC = +5V
TA = +25°C
MAX707
RESET, RESET ASSERTION
400ns/div
0V
+5V
RESET
RESET
1V/div
VCC = VRT
TA = +25°C
+5V
0V
VCC
GND
RESET 10kΩ
330pF
RESET
10kΩ
330pF
MAX707
RESET, RESET DE-ASSERTION
400ns/div
0V
+5V
RESET
RESET
2V/div
VCC = VRT
TA = +25°C
+5V
0V
VCC
GND
RESET
RESET
10kΩ
330pF
10kΩ
330pF
4
MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
______________________________________________________________Pin Description
Watchdog Output pulls low when the internal watch-
dog timer finishes its 1.6sec count and does not go
high again until the watchdog is cleared. WDO also
goes low during low-line conditions. Whenever VCC is
below the reset threshold, WDO stays low; however,
unlike RESET, WDO does not have a minimum pulse
width. As soon as VCC rises above the reset thresh-
old, WDO goes high with no delay.
Active-High Reset Output is the inverse of RESET.
Whenever RESET is high, RESET is low, and vice
versa (Figure 2). The MAX813L has a RESET output
only.
Active-Low Reset Output pulses low for 200ms when
triggered, and stays low whenever VCC is below the
reset threshold (4.65V in the MAX705 and 4.40V in the
MAX706). It remains low for 200ms after VCC rises
above the reset threshold or MR goes from low to high
(Figure 3). A watchdog timeout will not trigger RESET
unless WDO is connected to MR.
Watchdog Input. If WDI remains high or low for
1.6sec, the internal watchdog timer runs out and
WDO goes low (Figure 1). Floating WDI or connect-
ing WDI to a high-impedance three-state buffer dis-
ables the watchdog feature. The internal watchdog
timer clears whenever reset is asserted, WDI is three-
stated, or WDI sees a rising or falling edge.
Power-Fail Output goes low and sinks current when
PFI is less than 1.25V; otherwise PFO stays high.
Power-Fail Voltage Monitor Input. When PFI is less
than 1.25V, PFO goes low. Connect PFI to GND or
VCC when not used.
FUNCTION
MAX705/MAX706
RESET78—
WDO
8—8
RESET
—77
No ConnectN.C.—6—
WDI6—6
PFO
555
PFI444
0V Ground Reference for all signalsGND333
+5V Supply Input
VCC
222
NAME
DIP/SODIP/SODIP/SO
MAX707/MAX708
PIN
—
2
1
—
8
7
6
5
4
µMAX
2
—
1
—
—
7
6
5
4
µMAX
1
2
—
—
8
7
6
5
4
µMAX
MAX813L
Manual-Reset Input triggers a reset pulse when
pulled below 0.8V. This active-low input has an inter-
nal 250µA pull-up current. It can be driven from a TTL
or CMOS logic line as well as shorted to ground with
a switch.
MR
111 3 3 3
5
MAX705–MAX708/MAX813L
_______________Detailed Description
Reset Output
A microprocessor’s (µP’s) reset input starts the µP in a
known state. Whenever the µP is in an unknown state, it
should be held in reset. The MAX705-MAX708/MAX813L
assert reset during power-up and prevent code execu-
tion errors during power-down or brownout conditions.
On power-up, once VCC reaches 1V, RESET is a guaran-
teed logic low of 0.4V or less. As VCC rises, RESET stays
low. When VCC rises above the reset threshold, an inter-
nal timer releases RESET after about 200ms. RESET puls-
es low whenever VCC dips below the reset threshold, i.e.
brownout condition. If brownout occurs in the middle of
a previously initiated reset pulse, the pulse continues for
at least another 140ms. On power-down, once VCC falls
below the reset threshold, RESET stays low and is guar-
anteed to be 0.4V or less until VCC drops below 1V.
The MAX707/MAX708/MAX813L active-high RESET output
is simply the complement of the RESET output, and is
guaranteed to be valid with VCC down to 1.1V. Some µPs,
such as Intel’s 80C51, require an active-high reset pulse.
Watchdog Timer
The MAX705/MAX706/MAX813L watchdog circuit moni-
tors the µP’s activity. If the µP does not toggle the watch-
dog input (WDI) within 1.6sec and WDI is not three-stat-
ed, WDO goes low. As long as RESET is asserted or the
WDI input is three-stated, the watchdog timer will stay
cleared and will not count. As soon as reset is released
and WDI is driven high or low, the timer will start counting.
Pulses as short as 50ns can be detected.
Typically, WDO will be connected to the non-maskable
interrupt input (NMI) of a µP. When VCC drops below
the reset threshold, WDO will go low whether or not the
watchdog timer has timed out yet. Normally this would
trigger an NMI interrupt, but RESET goes low simultane-
ously, and thus overrides the NMI interrupt.
If WDI is left unconnected, WDO can be used as a low-
line output. Since floating WDI disables the internal
timer, WDO goes low only when VCC falls below the
reset threshold, thus functioning as a low-line output.
The MAX705/MAX706 have a watchdog timer and a
RESET output. The MAX707/MAX708 have both active-
high and active-low reset outputs. The MAX813L has
both an active-high reset output and a watchdog timer.
Manual Reset
The manual-reset input (MR) allows reset to be triggered
by a pushbutton switch. The switch is effectively
debounced by the 140ms minimum reset pulse width.
MR is TTL/CMOS logic compatible, so it can be driven by
an external logic line. MR can be used to force a watch-
dog timeout to generate a reset pulse in the MAX705/
MAX706/MAX813L. Simply connect WDO to MR.
Low-Cost, µP Supervisory Circuits
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
TIMER
TIMEBASE FOR
RESET AND
WATCHDOG
RESET
GENERATOR
VCC
250µA
8WDO
7RESET
(RESET)
5PFO
GND
3
1.25V
4.65V*
* 4.40V FOR MAX7O6.
( ) ARE FOR MAX813L ONLY.
6
WDI
1
MR
2
VCC
4
PFI
MAX705
MAX706
MAX813L
Figure 1. MAX705/MAX706/MAX813L Block Diagram
RESET
GENERATOR
VCC
250µA
8RESET
7RESET
5PFO
GND
3
1.25V
4.65V*
* 4.40V FOR MAX7O6.
1
MR
2
VCC
4
PFI
MAX707
MAX708
Figure 2. MAX707/MAX708 Block Diagram
6
MAX705–MAX708/MAX813L
Power-Fail Comparator
The power-fail comparator can be used for various pur-
poses because its output and noninverting input are
not internally connected. The inverting input is internal-
ly connected to a 1.25V reference.
To build an early-warning circuit for power failure, con-
nect the PFI pin to a voltage divider (see
Typical
Operating Circuit
). Choose the voltage divider ratio so
that the voltage at PFI falls below 1.25V just before the
+5V regulator drops out. Use PFO to interrupt the µP
so it can prepare for an orderly power-down.
__________Applications Information
Ensuring a Valid RESET
Output Down to VCC = 0V
When VCC falls below 1V, the MAX705-MAX708 RESET
output no longer sinks current—it becomes an open cir-
cuit. High-impedance CMOS logic inputs can drift to
undetermined voltages if left undriven. If a pull-down
resistor is added to the RESET pin as shown in Figure 5,
any stray charge or leakage currents will be drained to
ground, holding RESET low. Resistor value (R1) is not
critical. It should be about 100kΩ, large enough not to
load RESET and small enough to pull RESET to ground.
Monitoring Voltages Other Than the
Unregulated DC Input
Monitor voltages other than the unregulated DC by
connecting a voltage divider to PFI and adjusting the
ratio appropriately. If required, add hysteresis by con-
necting a resistor (with a value approximately 10 times
the sum of the two resistors in the potential divider net-
work) between PFI and PFO. A capacitor between PFI
and GND will reduce the power-fail circuit’s sensitivity
to high-frequency noise on the line being monitored.
RESET can be asserted on other voltages in addition to
the +5V VCC line. Connect PFO to MR to initiate a RESET
pulse when PFI drops below 1.25V. Figure 6 shows the
MAX705-MAX708 configured to assert RESET when the
+5V supply falls below the reset threshold, or when the
+12V supply falls below approximately 11V.
Monitoring a Negative Voltage
The power-fail comparator can also monitor a negative
supply rail (Figure 7). When the negative rail is good (a
negative voltage of large magnitude), PFO is low, and
when the negative rail is degraded (a negative voltage
of lesser magnitude), PFO is high. By adding the resis-
tors and transistor as shown, a high PFO triggers reset.
As long as PFO remains high, the MAX705-
MAX708/MAX813L will keep reset asserted (RESET =
low, RESET = high). Note that this circuit’s accuracy
depends on the PFI threshold tolerance, the VCC line,
and the resistors.
Low-Cost, µP Supervisory Circuits
tWP tWD tWD tWD
+5V
0V
WDI
+5V
0V
WDO
+5V
0V
RESET
+5V
0V
(RESET)
tRS
( ) ARE FOR MAX813L ONLY.
RESET EXTERNALLY
TRIGGERED BY MR
Figure 3. MAX705/MAX706/MAX813L Watchdog Timing
Figure 4. MAX705/MAX706 RESET, MR, and WDO Timing with
WDI Three-Stated. The MAX707/MAX708/MAX813L RESET
output is the inverse of RESET shown.
tRS tRS
+5V
0V
RESET
WDO
+5V
0V
MR
tMR
MR EXTERNALLY DRIVEN LOW
+5V
0V
VCC
VRT VRT
tMD
7
MAX705–MAX708/MAX813L
Interfacing to µPs with
Bidirectional Reset Pins
µPs with bidirectional reset pins, such as the Motorola
68HC11 series, can contend with the MAX705-MAX708
RESET output. If, for example, the RESET output is driven
high and the µP wants to pull it low, indeterminate logic
levels may result. To correct this, connect a 4.7kΩ
resistor between the RESET output and the µP reset I/O,
as in Figure 8. Buffer the RESET output to other system
components.
Low-Cost, µP Supervisory Circuits
MAX70_
RESET
R2
R1
+5V
V-
VCC
PFI
GND
MR
PFO
TO µP
100kΩ
100kΩ
2N3904
MR
PFO
+5V
0V
+5V
0V
VTRIP 0V
V-
Figure 7. Monitoring a Negative Voltage
MAX70_
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
4.7kΩ
VCC
GND
RESET
VCC
GND
RESET
µP
Figure 8. Interfacing to µPs with Bidirectional Reset I/O
5 1.25
R1
1.25 VTRIP
R2
,V
TRIP 0
−=−<
MAX70_
RESET
R1
Figure 5. RESET Valid to Ground Circuit
MAX70_
RESET
130kΩ
1%
PARAMETER MIN TYP MAX UNIT
+12V Reset
Threshold at +25°C10.67 10.87 11.50 V
1MΩ
1%
+5V
+12V
VCC
PFI
GND
MR
PFO
TO µP
Figure 6. Monitoring Both +5V and +12V
8
MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
__Ordering Information (continued)
8 CERDIP**-55°C to +125°CMAX813LMJA
8 Plastic DIP0°C to +70°C
MAX708CPA
8SO0°C to +70°CMAX708CSA
Dice*0°C to +70°CMAX708C/D
8 Plastic DIP-40°C to +85°CMAX708EPA
8SO-40°C to +85°CMAX708ESA
8 CERDIP**-55°C to +125°CMAX708MJA
8 Plastic DIP0°C to +70°C
MAX813LCPA
8SO0°C to +70°CMAX813LCSA
Dice*0°C to +70°CMAX813LC/D
8 Plastic DIP-40°C to +85°CMAX813LEPA
8SO-40°C to +85°CMAX813LESA
8 CERDIP**-55°C to +125°CMAX707MJA
8SO-40°C to +85°CMAX707ESA
8 Plastic DIP-40°C to +85°CMAX707EPA
Dice*0°C to +70°CMAX707C/D
8SO0°C to +70°CMAX707CSA
8 Plastic DIP0°C to +70°C
MAX707CPA
8 CERDIP**-55°C to +125°CMAX706MJA
8SO-40°C to +85°CMAX706ESA
8 Plastic DIP-40°C to +85°CMAX706EPA
8 CERDIP**-55°C to +125°CMAX705MJA
8SO-40°C to +85°CMAX705ESA
8 Plastic DIP-40°C to +85°CMAX705EPA
PIN-PACKAGETEMP RANGEPART
Dice*0°C to +70°CMAX706C/D
8SO0°C to +70°CMAX706CSA
8 Plastic DIP0°C to +70°C
MAX706CPA
8 µMAX0°C to +70°CMAX706CUA
8 µMAX0°C to +70°CMAX707CUA
8 µMAX0°C to +70°CMAX708CUA
8 µMAX0°C to +70°CMAX813LCUA
_____Pin Configurations (continued)
TOP VIEW
1
2
3
4
8
7
6
5
WDO
RESET
WDI
PFO
PFI
PFI
VCC
MR
µMAX
MAX705
MAX706
MAX813L
1
2
3
4
8
7
6
5
N.C.
GND
GND
VCC
MR
µMAX
MAX707
MAX708
( ) ARE FOR MAX813L ONLY.
(RESET) RESET
PFO
RESET
____________________Chip Topography
( ) ARE FOR MAX813L ONLY.
TRANSISTOR COUNT: 572
SUBSTRATE MUST BE LEFT UNCONNECTED.
RESET (RESET)
GND
WDO/RESET
PFI
0.051"
(1.30mm)
0.074"
(1.88mm)
WDI/N.C.
PFO
VCC MR
8 µMAX-40°C to +85°CMAX705EUA
8 µMAX-40°C to +85°CMAX706EUA
8 µMAX-40°C to +85°CMAX707EUA
8 µMAX-40°C to +85°CMAX708EUA
8 µMAX-40°C to +85°CMAX813LEUA
*
Dice are specified at TA= +25°C.
**
Contact factory for availability and processing to MIL-STD-883.
Devices in PDIP, SO and µMAX packages are available in both
leaded and lead-free packaging. Specify lead free by adding
the + symbol at the end of the part number when ordering.
Lead free not available for CERDIP package.
9
MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
MAX1232 4.37/4.62 250 ✔✔ ✔0.15/0.6/1.2 ✔0.2(0.05) 8 1.71
MAX690A/692A 4.65/4.40 140 ✔✔1.6 ✔10 400 ✔0.35(0.2) 5(0.05) 8 3.26
MAX690R/S/T 2.63/2.93/3.08 140 ✔✔1.6 ✔6 400 ✔0.5(0.4) 1(0.4) 8 3.23
MAX691A/693A 4.65/4.40 140/adj. ✔✔ ✔1.6/adj. ✔✔1.2 25 ✔/10ns ✔✔0.1(0.035) 5(0.04) 16 3.61
MAX1691 The MAX1691 is a module with the MAX691A and a 125mAh lithium battery 16 ††
MAX696 Adj. 35/adj. ✔✔ 1.6/adj. ✔✔ ✔ ✔ 16 3.55
MAX697 Adj. 35/adj. ✔✔ 1.6/adj. ✔✔✔ 16 3.58
MAX700 4.65/adj. 200 ✔✔ ✔0.2(0.1) 8 2.17
MAX703/704 4.65/4.40 140 ✔✔ ✔10 400 ✔✔ 0.35(0.2) 5(0.05) 8 1.38*
MAX704R/S/T 2.63/2.93/3.08 140 ✔✔ ✔6 400 ✔✔ 0.5(0.4) 1(0.4) 8 2.93
MAX705/706 4.65/4.40 140 ✔✔1.6 ✔✔✔0.35(0.2) 8 1.02*
MAX706P 2.63 140 ✔✔1.6 ✔✔✔0.35(0.2) 8 1.71
MAX706R/S/T 2.63/2.93/3.08 140 ✔✔1.6 ✔✔✔0.35(0.2) 8 1.71
MAX707/708 4.65/4.40 140 ✔✔ ✔ ✔ ✔ 0.35(0.2) 8 0.88*
MAX708R/S/T 2.63/2.93/3.08 140 ✔✔ ✔ ✔ ✔ 0.35(0.2) 8 1.63
MAX791 4.65 140 ✔✔ ✔1✔✔1.2 25 ✔/10ns ✔ ✔✔✔0.15(0.06) 5(0.04) 16 3.90
MAX792L/M/R/S/T 4.65/4.40/ 140 ✔✔ ✔1✔✔/10ns ✔✔✔ 0.15(0.07) 16 3.42
2.63/2.93/3.08
MAX793R/S/U/T 2.63/2.93/3.07/3.08 140 ✔✔ ✔1.6 ✔✔TBD TBD ✔✔✔✔ TBD TBD 16 ††
MAX794 Adj. 140 ✔✔ ✔1.6 ✔✔TBD TBD ✔✔✔✔ TBD TBD 16 ††
MAX795R/S/U/T 2.63/2.93/3.07/3.08 140 ✔✔ ✔TBD TBD ✔✔TBD TBD 8 ††
MAX800L/M 4.60/4.40 140 ✔✔ ✔1.6/adj. ✔✔1.2 25 ✔/10ns ✔/±2% ✔0.1(0.035) 5(0.04) 16 3.88
MAX801L/N/M 4.68/4.58/4.43 140 ✔/±1.5% ✔1.6 ✔TBD TBD ✔TBD TBD 8 ††
MAX802L/M/R/S/T 4.60/4.40/ 140 ✔✔1.6 ✔10 400 ✔/±2% 0.35(0.2) 5(0.05) 8 3.59
2.63/2.93/3.08
MAX804R/S/T 2.63/2.93/3.08 140 ✔✔1.6 ✔6 400 ✔/±2% 0.5(0.4) 1(0.4) 8 3.66
MAX805L/M/R/S/T 4.65/4.40/ 140 ✔✔1.6 ✔10 400 ✔0.35(0.2) 5(0.05) 8 3.26
2.63/2.93/3.08
MAX806R/S/T 2.63/2.93/3.08 140 ✔✔ ✔ ✔6 400 ✔/±2% ✔0.5(0.4) 1(0.4) 8 3.90
MAX807L/N/M 4.68/4.58/4.43 140 ✔/±1.5% ✔/±1.5% ✔1.6 ✔✔TBD TBD ✔ ✔ ✔✔✔TBD TBD 8 ††
MAX808L/N/M 4.68/4.58/4.43 140 ✔/±1.5% ✔✔TBD TBD ✔✔TBD TBD 16 ††
MAX809L/M/R/S/T 4.65/4.40/ 140 ✔✔ 0.06(0.024) 3 ††
2.63/2.93/3.08
MAX810L/M/R/S/T 4.65/4.40/ 140 ✔✔ 0.06(0.024) 3 ††
2.63/2.93/3.08
MAX813L 4.65 140 ✔✔1.6 ✔✔/±2% ✔0.35(0.2) 8 1.02*
MAX814K/L/N/T 4.80/4.70/4.55/3.03 140 ✔/±1% ✔/±1% ✔✔/±2% ✔✔ TBD TBD 8 ††
MAX815K/L/N/T 4.80/4.70/4.55/3.03 140 ✔/±1% ✔1.6 ✔✔/±2% ✔TBD TBD 8 ††
MAX816 Adj./±1% 140 ✔✔ ✔ ✔/±2% ✔TBD TBD 8 ††
MAX820L/M/R/S/T 4.65/4.40/ 140 ✔✔ ✔1✔✔/10ns ✔/±2% ✔✔ 0.15(0.07) 16 3.82
2.63/2.93/3.08
MXD1210 4.37/4.62 ✔2.5 667 ✔0.5(0.23) 0.1(0.002) 8 2.44
___________________________________________µP Supervisory Circuits
Price†
1000-up ($)
Part
Number
Nominal Reset
Threshold (V)
Minimum Reset
Pulse Width (ms)
Active-Low
Reset
Active-High
Reset
Nominal
Watchdog
Timeout Period
(sec), if Available
Separate
Watchdog
Output
Backup-Battery
Switch
VCC-to-VOUT
On Resistance
Max (Ω)
–
C
—
E
–Write
Protect
VBATT-to-VOUT
On Resistance
Max (Ω)
Manual-Reset
Input
Low-Line
Output
Battery-On
Output
Power-Fail
Comparator
ISUPPLY
Operating Mode
mA
max (typ)
ISUPPLY
Backup Mode
µA
max (typ)
Pins
–
R
—
E
—
S
—
E
—
T
–Valid
to VCC = 1V
†Prices provided are for design guidance and are FOB USA (unless otherwise noted). International prices will differ due to local duties, taxes, and exchange rates.
†† Future product—contact factory for pricing and availability. Specifications are preliminary.
* 25,000 pc. price, factory direct
10
MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
8 µMAX U8-1 21-0036
8 Plastic DIP P8-1 21-0043
8 SO S8-1 21-0041
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.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.
11
MAX705–MAX708/MAX813L
Low-Cost, µP Supervisory Circuits
Revision History
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 2/92 Initial release —
8 3/10 Updated the Features, Absolute Maximum Ratings, Typical Operating
Characteristics, Figures 3, 7, 8, and the Package Information sections. 1, 2, 4, 7, 8, 10
12 Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000
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. 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.
© 2010 Maxim Integrated The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.
MAX705–MAX708/MAX813L