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MAX705–MAX708/MAX813L
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 significantly improve
system reliability and accuracy compared 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, lowbattery detection, or for monitoring a power supply
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
Critical μP Power Monitoring
Pin Configurations appear at end of data sheet.
Low-Cost, μP Supervisory Circuits
Benefits and Features
●● Supervisory-Function Integration Significantly
Improves System Reliability While Reducing Board
Space
• μMAX Package
• Guaranteed RESET Valid at VCC = 1V
-- 200ms Reset Pulse Width
-- Debounced TTL/CMOS-Compatible ManualReset Input
-- Active-High Reset Output (MAX707/MAX708/
MAX813L)
• Precision-Supply Voltage Monitor
-- 4.65V (MAX705/MAX707/MAX813L)
-- 4.40V (MAX706/MAX708)
• Voltage Monitor for Power-Fail or Low-Battery
Warning
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX705CPA
0°C to +70°C
8 Plastic DIP
MAX705CSA
0°C to +70°C
8 SO
MAX705CUA
0°C to +70°C
8 μMAX
MAX705C/D
0°C to +70°C
Dice*
*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(Pb)-free/RoHS-compliant packaging. Specify
lead-free by adding the + symbol at the endof the part number
when ordering.
Lead-free packaging is not available for CERDIP packages.
Ordering Information continued at end of data sheet.
Typical Operating Circuit
UNREGULATED DC
MAX667
+5V DC LINEAR
REGULATOR
µP
VCC
PFI
µMAX is a registered trademark of Maxim Integrated Products, Inc.
19-4334; Rev. 11; 7/18
PUSHBUTTON
SWITCH
RESET
PFI
MAX705
WDO
MR MAX706 PFO
MAX813L
VCC
RESET
I/O LINE
NMI
INTERRUPT
MAX705–MAX708/MAX813L
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
Absolute Maximum Ratings
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
Note 1: The input-voltage limits on PFI and MR can be exceeded if the input current is less than 10mA.
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 = 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
Operating Voltage Range
Supply Current
SYMBOL
VCC
ISUPPLY
CONDITIONS
MIN
VRT
1.0
5.5
MAX813LC
1.1
5.5
MAX70_E/M, MAX813LE/M
1.2
150
350
MAX705E/M, MAX706E/M, MAX813LE/M
150
500
MAX707C, MAX708C
50
350
50
500
MAX705, MAX707, MAX813L
4.50
4.65
4.75
MAX706, MAX708
4.25
4.40
4.50
40
tRS
140
ISOURCE = 800μA
RESET Output Voltage
µA
V
280
ms
VCC - 1.5
MAX70_C, VCC = 1V, ISINK = 50μA
0.3
MAX70_E/M, VCC = 1.2V, ISINK = 100μA
0.3
0.4
MAX813LC, ISOURCE = 4μA, VCC = 1.1V
0.8
MAX813LE/M, ISOURCE = 4μA, VCC = 1.2V
0.9
ISOURCE = 800μA
ISINK = 3.2mA
V
VCC - 1.5
MAX707, MAX708, ISINK = 1.2mA
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200
0.4
MAX813L
V
mV
ISINK = 3.2mA
MAX707, MAX708, ISOURCE = 800μA
RESET Output Voltage
UNITS
5.5
MAX705C, MAX706C, MAX813LC
Reset Threshold Hysteresis (Note 2)
Reset Pulse Width (Note 2)
MAX
MAX70_C
MAX707E/M, MAX708E/M
Reset Threshold (Note 2)
TYP
V
VCC - 1.5
0.4
Maxim Integrated │ 2
MAX705–MAX708/MAX813L
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
1.60
2.25
Watchdog Timeout Period
tWD
MAX705, MAX706, MAX813L
1.00
WDI Pulse Width
tWP
VIL = 0.4V, VIH = (VCC) (0.8)
50
WDI Input Threshold
Low
MAX705, MAX706, MAX813L, VCC = 5V
High
MAX705, MAX706, MAX813L, WDI = 0V
MAX705, MAX706, MAX813L,
ISOURCE = 800μA
WDO Output Voltage
MR = 0V
MR Pulse Width
MR Input Threshold
tMR
50
-150
150
-50
VCC - 1.5
100
250
600
tMD
ISOURCE = 800μA
μA
ns
2.0
VCC = 5V
µA
V
0.8
High
V
0.4
150
PFI Input Current
PFO Output Voltage
3.5
Low
MR to Reset Out Delay (Note 2)
PFI Input Threshold
0.8
MAX705, MAX706, MAX813L,
ISINK = 1.2mA
MR Pull-Up Current
s
ns
MAX705, MAX706, MAX813L, VCC = 5V
WDI Input Current
UNITS
V
250
ns
1.20
1.25
1.30
V
-25.00
+0.01
+25.00
nA
VCC - 1.5
ISINK = 3.2mA
0.4
V
Note 2: Applies to both RESET in the MAX705–MAX708 and RESET in the MAX707/MAX708/MAX813L.
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Maxim Integrated │ 3
MAX705–MAX708/MAX813L
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
Typical Operating Characteristics
MAX705/MAX707
RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
MAX705 toc01
MAX705/MAX707
RESET RESPONSE TIME
MAX705 toc02
+5V
TA = +25°C
1V/div
VCC
+5V
VCC
TA = +25°C
PFO
VCC
GND
PFI
POWER-FAIL COMPARATOR
ASSERTION RESPONSE TIME
+5V
+5V
RESET
RESET
GND
VCC = +5V
TA = +25°C
10kΩ
10k
330pF
VCC
0V
+5V
RESET
400ns/div
+5V
+5V
VCC
+4V
VCC
RESET
0V
GND
330pF 10kΩ
+4V
330pF 10kΩ
1V/div
RESET
0V
0V
500ms/div
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MAX705 toc08
+5V
1V/div
VCC
RESET
GND
400ns/div
MAX813L
RESET RESPONSE TIME
TA = +25°C
VCC
330pF
0V
400ns/div
MAX707/MAX708/MAX813L
RESET OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE MAX705 toc07
10k
330pF
330pF RESET
+1.20V 0V
0V
RESET
RESET
GND
RESET
10kΩ
2V/div
VCC
VCC = VRT
TA = +25°C
+5V
1V/div
0V
0V
50mV/div
PFI
1V/div
+1.30V
MAX705 toc06
MAX705 toc05
RESET
30pF
+1.25V
MAX707
RESET, RESET DE-ASSERTION
VCC = VRT
TA = +25°C
+5V
1kΩ
400ns/div
MAX707
RESET, RESET ASSERTION
MAX705 toc04
PFO
+1.20V
2µs/div
500ms/div
+5V
+3V
+1.30V
RESET
30pF
0V
PFI
1kΩ
30pF
0V
10kΩ
RESET
RESET
0V
PFO
+1.25V
1V/div
GND
RESET
330pF
1V/div
RESET
RESET
VCC
2kΩ
VCC = +5V
TA = +25°C
PFO
+4V
+5V
VCC
VCC
MAX705 toc08
+5V
PFI
+5V
0V
POWER-FAIL COMPARATOR
DE-ASSERTION RESPONSE TIME
2µs/div
Maxim Integrated │ 4
MAX705–MAX708/MAX813L
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
Pin Description
PIN
MAX705/MAX706
MAX707/MAX708
DIP/SO
DIP/SO
μMAX
μMAX
MAX813L
DIP/SO
NAME
FUNCTION
MR
Manual-Reset Input triggers a reset pulse when
pulled below 0.8V. This active-low input has an
internal 250μA pullup current. It can be driven from a
TTL or CMOS logic line, as well as shorted to ground
with a switch.
μMAX
1
3
1
3
1
3
2
4
2
4
2
4
VCC
+5V Supply Input
3
5
3
5
3
5
GND
0V Ground Reference for all signals
4
6
4
6
4
6
PFI
Power-Fail Voltage-Monitor Input. When PFI is less
than 1.25V, PFO goes low. Connect PFI to GND or
VCC when not used.
5
7
5
7
5
7
PFO
Power-Fail Output goes low and sinks current when
PFI is less than 1.25V; otherwise PFO stays high.
6
8
—
—
6
8
WDI
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 connecting
WDI to a high-impedance three-state buffer disables
the watchdog feature. The internal watchdog timer
clears whenever reset is asserted, WDI is three
stated, or WDI sees a rising or falling edge.
—
—
6
—
—
—
N.C.
No Connect
7
8
—
1
2
—
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7
—
8
1
—
2
—
8
7
—
2
1
RESET
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.
WDO
Watchdog Output pulls low when the internal
watchdog 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 threshold, WDO goes high with no delay.
RESET
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.
Maxim Integrated │ 5
MAX705–MAX708/MAX813L
WDI
6
WATCHDOG
TRANSITION
DETECTOR
WATCHDOG
TIMER
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
8
VCC
WDO
VCC
250µA
MR
VCC
250µA
TIMEBASE FOR
RESET AND
WATCHDOG
MR
RESET
GENERATOR
2
MAX705
MAX706
MAX813L
4
7
RESET
(RESET)
PFI
5
7
RESET
GENERATOR
2
4.65V*
4
RESET
MAX707
MAX708
5
PFO
PFO
1.25V
1.25V
* 4.40V FOR MAX7O6.
( ) ARE FOR MAX813L ONLY.
VCC
RESET
1
1
4.65V*
PFI
8
3 GND
* 4.40V FOR MAX7O6.
3 GND
Figure 1. MAX705/MAX706/MAX813L Block Diagram
Figure 2. MAX707/MAX708 Block Diagram
Detailed Description
stated, WDO goes low. As long as RESET is asserted or
the WDI input is three stated, the watchdog timer stays
cleared and will not count. As soon as reset is released
and WDI is driven high or low, the timer starts counting.
Pulses as short as 50ns can be detected.
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 execution
errors during power-down or brownout conditions.
On power-up, once VCC reaches 1V, RESET is a
guaranteed logic low of 0.4V or less. As VCC rises, RESET
stays low. When VCC rises above the reset threshold, an
internal timer releases RESET after about 200ms. RESET
pulses 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
guaranteed 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
monitors the μP’s activity. If the μP does not toggle the
watchdog input (WDI) within 1.6sec and WDI is not three
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Typically, WDO is not connected to the nonmaskable
interrupt input (NMI) of a μP. When VCC drops below
the reset threshold, WDO goes low whether or not
the watchdog timer has timed out yet. Normally this
would trigger an NMI interrupt, but RESET goes low
simultaneously, and thus overrides the NMI interrupt.
If WDI is left unconnected, WDO can be used as a lowline 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 activehigh 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 watchdog
timeout to generate a reset pulse in the MAX705/ MAX706/
MAX813L. Simply connect WDO to MR.
Maxim Integrated │ 6
MAX705–MAX708/MAX813L
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
Power-Fail Comparator
The power-fail comparator can be used for various
purposes because its output and noninverting input are
not internally connected. The inverting input is internally
connected to a 1.25V reference.
To build an early-warning circuit for power failure, connect
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
tWP
tWD
tWD
+5V
WDI
+5V
0V
+5V
RESET
0V
RESET EXTERNALLY
TRIGGERED BY MR
+5V
tRS
Monitoring Voltages Other Than the
Unregulated DC Input
0V
( ) ARE FOR MAX813L ONLY.
Figure 3. MAX705/MAX706/MAX813L Watchdog Timing
VCC
VRT
VRT
tRS
tRS
+5V
RESET
+5V
0V
+5V
tMD
tMR
WDO
0V
Monitor voltages other than the unregulated DC by
connecting a voltage-divider to PFI and adjusting the ratio
appropriately. If required, add hysteresis by connecting a
resistor (with a value approximately 10 times the sum of
the two resistors in the potential divider network) between
PFI and PFO. A capacitor between PFI and GND reduces
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
0V
MR
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
circuit. High-impedance CMOS logic inputs can drift
to undetermined voltages if left undriven. If a pulldown
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.
0V
WDO
(RESET)
tWD
MR EXTERNALLY DRIVEN LOW
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 resistors
and transistor as shown, a high PFO triggers a reset.
As long as PFO remains high, the MAX705–MAX708/
MAX813L 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.
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.
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Maxim Integrated │ 7
MAX705–MAX708/MAX813L
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
+12V
+5V
VCC
1MΩ
1%
TO µP
RESET
MAX70_
MAX70_
MR
130kΩ
1%
RESET
PFI
R1
Figure 5. RESET Valid to Ground Circuit
GND
PFO
PARAMETER
MIN
TYP
MAX
UNIT
+12V Reset
Threshold at +25°C
10.67
10.87
11.50
V
Figure 6. Monitoring Both +5V and +12V
BUFFERED RESET TO OTHER SYSTEM COMPONENTS
+5V
100kΩ
VCC
MR
R1
MAX70_
VCC
100kΩ
2N3904
PFO
PFI
VCC
MAX70_
RESET
R2
GND
RESET
µP
4.7kΩ
RESET
TO µP
GND
VMR
PFO
GND
+5V
0V
Figure 6. Monitoring Both +5V and +12V
+5V
0V
VTRIP
V5 – 1.25
R1
=
1.25 – VTRIP
R2
, VTRIP < 0
Figure 7. Monitoring a Negative Voltage
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0V
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.
Maxim Integrated │ 8
MAX705–MAX708/MAX813L
Ordering Information (continued)
PART
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
Pin Configurations
TEMP RANGE
PIN-PACKAGE
MAX705EPA
-40°C to +85°C
8 Plastic DIP
MR
1
MAX705ESA
-40°C to +85°C
8 SO
VCC
2
MAX705EUA
-40°C to +85°C
8 μMAX
GND 3
TOP VIEW
PFI 4
MAX705MJA
-55°C to +125°C
8 CERDIP**
MAX706CPA
0°C to +70°C
8 Plastic DIP
MAX706CSA
0°C to +70°C
8 SO
MAX706CUA
0°C to +70°C
8 μMAX
MR
1
Dice*
VCC
2
MAX706C/D
0°C to +70°C
MAX706EPA
-40°C to +85°C
8 Plastic DIP
MAX706ESA
-40°C to +85°C
8 SO
MAX706EUA
-40°C to +85°C
8 μMAX
MAX706MJA
-55°C to +125°C
8 CERDIP**
MAX707CPA
0°C to +70°C
8 Plastic DIP
MAX707CSA
0°C to +70°C
8 SO
MAX707CUA
0°C to +70°C
8 μMAX
MAX707C/D
0°C to +70°C
Dice*
MAX707EPA
-40°C to +85°C
8 Plastic DIP
MAX707ESA
-40°C to +85°C
8 SO
MAX707EUA
-40°C to +85°C
8 μMAX
MAX707MJA
-55°C to +125°C
8 CERDIP**
MAX708CPA
0°C to +70°C
8 Plastic DIP
MAX708CSA
0°C to +70°C
8 SO
MAX708CUA
0°C to +70°C
8 μMAX
MAX708C/D
0°C to +70°C
Dice*
MAX708EPA
-40°C to +85°C
8 Plastic DIP
MAX708ESA
-40°C to +85°C
8 SO
MAX708EUA
-40°C to +85°C
8 μMAX
MAX708MJA
-55°C to +125°C
8 CERDIP**
MAX813LCPA
0°C to +70°C
8 Plastic DIP
MAX813LCSA
0°C to +70°C
8 SO
MAX813LCUA
0°C to +70°C
8 μMAX
MAX813LC/D
0°C to +70°C
Dice*
MAX813LEPA
-40°C to +85°C
8 Plastic DIP
MAX813LESA
-40°C to +85°C
8 SO
MAX813LEUA
-40°C to +85°C
8 μMAX
MAX813LMJA
-55°C to +125°C
8 CERDIP**
MAX705
MAX706
MAX813L
8
WDO
7
RESET (RESET)
6
WDI
5
PFO
8
RESET
7
RESET
6
N.C.
5
PFO
DIP/SO
GND 3
MAX707
MAX708
PFI 4
DIP/SO
( ) ARE FOR MAX813L ONLY.
TOP VIEW
(RESET) RESET
1
WDO
2
MR
3
VCC
4
MAX705
MAX706
MAX813L
8
WDI
7
PFO
6
PFI
5
GND
8
N.C.
7
PFO
µMAX
RESET
1
RESET
2
MR
3
VCC
4
MAX707
MAX708
6
PFI
5
GND
µMAX
( ) ARE FOR MAX813L ONLY.
*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.
www.maximintegrated.com
Maxim Integrated │ 9
www.maximintegrated.com
140
140
140
140
140
140
140
140
140
140
140
4.65/adj.
4.65/4.40
2.63/2.93/3.08
4.65/4.40
2.63
2.63/2.93/3.08
4.65/4.40
2.63/2.93/3.08
4.65
4.60/4.40/
2.63/2.93/3.08
2.63/2.93/3.07/3.08
Adj.
2.63/2.93/3.07/3.08
4.60/4.40
4.68/4.58/4.43
4.60/4.40/
2.63/2.93/3.08
2.63/2.93/3.08
4.65/4.40/
2.63/2.93/3.08
2.63/2.93/3.08
4.68/4.58/4.43
4.68/4.58/4.43
4.65/4.40/
2.63/2.93/3.08
4.65/4.40/
2.63/2.93/3.08
4.65
4.80/4.70/4.55/3.03
4.80/4.70/4.55/3.03
Adj./±1%
4.65/4.40/
2.63/2.93/3.08
4.37/4.62
MAX700
MAX703/704
MAX704R/S/T
MAX705/706
MAX706P
MAX706R/S/T
MAX707/708
MAX708R/S/T
MAX791
MAX802L/M/R/S/T
MAX793R/S/U/T
MAX794
MAX795R/S/U/T
MAX800L/M
MAX801L/N/M
MAX802L/M/R/S/T
MAX804R/S/T
MAX805L/M/R/S/T
MAX806R/S/T
MAX807L/N/M
MAX808L/N/M
MAX809L/M/R/S/T
MAX810L/M/R/S/T
MAX813L
MAX814K/L/N/T
MAX815K/L/N/T
MAX816
MAX820L/M/R/S/T
MXD1210
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
140
200
35/adj.
ü
ü/±1%
ü/±1%
ü
ü
ü
ü/±1.5%
ü/±1.5%
ü
ü/±1.5%
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü/±1%
ü
ü
ü/±1.5%
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Adj.
MAX697
35/adj.
ü
ü
ü
ü
ü
ü
Adj.
MAX696
ü
ü
ü
ü
The MAX1691 is a module with the MAX691A and a 125mAh lithium battery
ü
ü
MAX1691
140/adj.
ü
ü
ü
ü
4.65/4.40
140
140
250
MAX691A/693A
Part Number
2.63/2.93/3.08
Nominal Reset
MAX690R/S/T
Threshold (V)
4.65/4.40
Active-Low
Reset
4.37/4.62
Active-High
Reset
MAX690A/692A
RESET Valid to VCC = 1V
MAX1232
Minimum Reset
Pulse Width (ms)
Ordering Information
Nominal Watchdog Timeout
Period (sec), if Available
1
1.6
1.6
1.6
1.6
1.6
1.6
1.6
1.6/adj.
1.6
1.6
1
1
1.6
1.6
1.6
1.6/adj.
1.6/adj.
1.6/adj.
1.6
1.6
0.15/0.6/1.2
Separate Watchdog Output
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Backup-Battery Switch
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
VCC-to-VOUT On
Resistance Max (Ω)
2.5
TBD
TBD
6
10
6
10
TBD
1.2
TBD
TBD
TBD
1.2
6
10
1.2
6
10
VBATT - to-VOUT On
Resistance Max (Ω)
667
TBD
TBD
400
400
400
400
TBD
25
TBD
TBD
TBD
25
400
400
25
400
400
CE Write Protect
Maxim Integrated │ 10
ü
ü/10ns
ü
ü
ü
ü
ü
ü/10ns
ü/10ns
ü/10ns
ü
ü/10ns
Power-Fail Comparator
ü/±2%
ü/±2%
ü/±2%
ü/±2%
ü/±2%
ü/±2%
ü
ü
ü/±2%
ü/±2%
ü/±2%
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Manual-Reset Input
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
ü
Low-Line Output
ü
ü
ü
ü
ü
Battery-On Output
ü
ü
ü
ü
ü
ISUPPLY Operating Mode mA
max (typ)
0.5 (0.23)
0.15
(0.07)
TBD
TBD
TBD
0.35(0.2)
0.06
(0.024)
0.06
(0.024)
TBD
TBD
0.5(0.4)
0.35(0.2)
0.5(0.4)
0.35(0.2)
TBD
0.1(0.035)
TBD
TBD
TBD
0.15(0.07)
0.15(0.06)
0.35(0.2)
0.35(0.2)
0.35(0.2)
0.35(0.2)
0.35(0.2)
0.5(0.4)
0.35(0.2)
0.2(0.1)
0.1(0.035)
0.5(0.4)
0.35(0.2)
0.2(0.05)
ISUPPLY Backup Mode
µA max (typ)
0.1(0.002)
TBD
TBD
TBD
TBD
TBD
1(0.4)
5(0.05)
1(0.4)
5(0.05)
TBD
5(0.04)
TBD
TBD
TBD
5(0.04)
1(0.4)
5(0.05)
5(0.04)
1(0.4)
5(0.05)
Pins
8
16
8
8
8
8
3
3
16
8
8
8
8
8
8
8
16
8
16
16
16
8
8
8
8
8
8
8
8
16
16
16
16
8
8
8
Price† 1000-up ($)
2.44
3.82
††
††
††
1.02*
††
††
††
††
3.90
3.26
3.66
3.59
††
3.88
††
††
††
3.42
3.90
1.63
0.88*
1.71
1.71
1.02*
2.93
1.38*
2.17
3.58
3.55
††
3.61
3.23
3.26
1.71
MAX705–MAX708/MAX813L
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
MAX705–MAX708/MAX813L
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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.
PACKAGE TYPE
PACKAGE CODE
OUTLINE NO.
8 μMAX
U8+1
21-0036
8 Plastic DIP
P8+1
21-0043
8 SO
S8+2
21-0041
Chip Topography
VCC MR
WDO/RESET
RESET (RESET)
WDI/N.C.
0.051"
(1.30mm)
GND
PFI
PFO
0.074"
(1.88mm)
( ) ARE FOR MAX813L ONLY.
TRANSISTOR COUNT: 572
SUBSTRATE MUST BE LEFT UNCONNECTED.
www.maximintegrated.com
Maxim Integrated │ 11
MAX705–MAX708/MAX813L
Low-Cost, μP Supervisory Circuits
Revision History
REVISION
NUMBER
REVISION
DATE
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
9
1/13
Updated package code for 8 SO package
11
10
4/15
Deleted “Automotive Systems” from Applications and updated Benefits and Features
sections
1
11
7/18
Updated Pin Description table
5
DESCRIPTION
—
1, 2, 4, 7, 8, 10
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated 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.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2018 Maxim Integrated Products, Inc. │ 12
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