MAXIM MAX705, MAX708, MAX813L User Manual

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

________________________________________________________________

Maxim Integrated Products

1

_________________Pin Configurations

V

CC

PFI

MR

PFO

WDO

RESET

UNREGULATED DC

PUSHBUTTON

SWITCH

PFI

I/O LINE

INTERRUPT

µP

MAX705
MAX706

MAX813L

MAX667

+5V DC LINEAR

REGULATOR

V

CC

RESET

NMI

__________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 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,
low-battery 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
Automotive Systems
Critical µP Power Monitoring

___________________________Features

o Available in Tiny µMAX Package
o Guaranteed RESET Valid at V

CC

= 1V

o Precision Supply-Voltage Monitor

4.65V in MAX705/MAX707/MAX813L

4.40V in MAX706/MAX708

o 200ms Reset Pulse Width
o Debounced TTL/CMOS-Compatible

Manual-Reset Input

o Independent Watchdog Timer—1.6s Timeout

(MAX705/MAX706)

o Active-High Reset Output

(MAX707/MAX708/MAX813L)

o Voltage 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

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

µMAX is a registered trademark of Maxim Integrated Products, Inc.

TOP VIEW

V

GND

MR

1

2

CC

MAX705

3

MAX706

MAX813L

PFI

4

WDO

8

RESET (RESET)

7

WDI

6

5

PFO

( ) ARE FOR MAX813L ONLY.
Pin Configurations continued at end of data sheet.

V

GND

DIP/SO

MR

1

2

CC

MAX707

3

PFI

MAX708

4

DIP/SO

RESET

8

RESET

7

N.C.

6

5

PFO

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

2 _______________________________________________________________________________________

Terminal Voltage (with respect to GND)

V

CC

.............................................. -0.3V to 6.0V

All Other Inputs (Note 1) ............... -0.3V to (V

CC

+ 0.3V)

Input Current

V

CC

...................................................... 20mA

GND .................................................... 20mA

Output Current (all outputs) ............................. 20mA

Continuous Power Dissipation (T

A

= +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= T

MIN

to T

MAX

, 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 V

CC

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) V

RT

MAX705, MAX707, MAX813L 4.50 4.65 4.75
MAX706, MAX708 4.25 4.40 4.50

40 mV

Reset Pulse Width (Note 2) t

RS

140 200 280 ms

RESET Output Voltage

I

SOURCE

= 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)

I

SINK

= 3.2mA 0.4

0.3

0.3

RESET Output Voltage

MAX707, MAX708, I

SOURCE

= 800µA

V

MAX707, MAX708, I

SINK

= 1.2mA 0.4

0.8

0.9

MAX813L

VCC- 1.5

0.4

Watchdog Timeout Period t

WD

MAX705, MAX706, MAX813L

1.00 1.60 2.25 s

WDI Pulse Width t

WP

VIL= 0.4V, VIH= (VCC) (0.8) 50 ns

WDI Input Threshold

0.8
V

3.5

MAX70_C, VCC= 1V, I

SINK

= 50µA

MAX70_E/M, VCC= 1.2V, I

SINK

= 100µA

MAX813LC, I

SOURCE

= 4µA, VCC= 1.1V

MAX813LE/M, I

SOURCE

= 4µA, VCC= 1.2V

I

SOURCE

= 800µA

I

SINK

= 3.2mA

Low
High

WDI Input Current

MAX705, MAX706, MAX813L, WDI = V

CC

50 150

µA

MAX705, MAX706, MAX813L, WDI = 0V -150 -50

WDO Output Voltage

VCC- 1.5

V

0.4

MAX705, MAX706, MAX813L,
V

CC

= 5V

MAX705, MAX706, MAX813L,
I

SOURCE

= 800µA

MAX705, MAX706, MAX813L,
I

SINK

= 1.2mA

V

VCC- 1.5

MAX707C, MAX708C 50 350
MAX707E/M, MAX708E/M 50 500

Supply Current I

SUPPLY

MAX705C, MAX706C, MAX813LC 150 350

µA

MAX705E/M, MAX706E/M, MAX813LE/M 150 500

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VCC= 4.75V to 5.5V for MAX705/MAX707/MAX813L, VCC= 4.5V to 5.5V for MAX706/MAX708, TA= T

MIN

to T

MAX

, 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

t

MR

150 ns

Low

High

MR Input Threshold

MR to Reset Out Delay (Note 2)

t

MD

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

I

SOURCE

= 800µA VCC- 1.5

V

I

SINK

= 3.2mA 0.4

Note 2: Applies to both RESET in the MAX705–MAX708 and RESET in the MAX707/MAX708/MAX813L.

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

4 _______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

MAX707/MAX708/MAX813L

RESET OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

500ms/div

V

CC

0V

RESET

0V

+5V

1V/div

+5V

1V/div

TA = +25°C

GND

RESET

V

CC

330pF

10k

Ω

MAX813L

RESET RESPONSE TIME

2µs/div

+5V

V

CC

0V

0V

+4V

+4V

GND

RESET

V

CC

330pF

10k

Ω

MAX705/MAX707

RESET OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

500ms/div

V

CC

0V

RESET

0V

+5V

1V/div

+5V

1V/div

V

CC

GND

RESET

V

CC

2k

Ω

RESET

330pF

TA = +25°C

MAX705/MAX707

RESET RESPONSE TIME

2µs/div

V

CC

+5V

RESET

+5V

+4V

1V/div

0V

TA = +25°C

V

CC

GND

RESET

V

CC

10k

Ω

RESET

30pF

POWER-FAIL COMPARATOR

DE-ASSERTION RESPONSE TIME

400ns/div

PFI

+1.20V

PFO

0V

+3V

+1.30V

VCC = +5V
T

A

= +25°C

+5V

PFO

30pF

1k

Ω

+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

1k

Ω

+1.25V

PFI

VCC = +5V
T

A

= +25°C

MAX707

RESET, RESET ASSERTION

400ns/div

0V

+5V

RESET

RESET

1V/div

VCC = V

RT

TA = +25°C

+5V

0V

V

CC

GND

RESET

10k

Ω

330pF

RESET

10k

Ω

330pF

MAX707

RESET, RESET DE-ASSERTION

400ns/div

0V

+5V

RESET

RESET

2V/div

VCC = V

RT

TA = +25°C

+5V

0V

V

CC

GND

RESET

RESET

10k

Ω

330pF

10k

Ω

330pF

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

_______________________________________________________________________________________ 5

______________________________________________________________Pin Description

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 V

CC

is

below the reset threshold, WDO stays low; however,
unlike RESET, WDO does not have a minimum pulse
width. As soon as V

CC

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 V

CC

is below the
reset threshold (4.65V in the MAX705 and 4.40V in the
MAX706). It remains low for 200ms after V

CC

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 connect­ing WDI to a high-impedance three-state buffer dis­ables the watchdog feature. The internal watchdog
timer clears whenever reset is asserted, WDI is three­stated, 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
V

CC

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

V

CC

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 inter­nal 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

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 execu­tion errors during power-down or brownout conditions.

On power-up, once VCCreaches 1V, RESET is a guaran­teed logic low of 0.4V or less. As VCCrises, RESET stays
low. When VCCrises above the reset threshold, an inter­nal timer releases RESET after about 200ms. RESET puls­es low whenever V

CC

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 V

CC

falls

below the reset threshold, RESET stays low and is guar­anteed to be 0.4V or less until V

CC

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 VCCdown 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-stat­ed, 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 V

CC

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 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 VCCfalls 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.

Low-Cost, µP Supervisory Circuits

6 _______________________________________________________________________________________

Figure 1. MAX705/MAX706/MAX813L Block Diagram

Figure 2. MAX707/MAX708 Block Diagram

WATCHDOG

6

1

2

4

TRANSITION

DETECTOR

V

CC

250µA

4.65V*

1.25V

WDI

MR

V

CC

PFI

* 4.40V FOR MAX7O6.
( ) ARE FOR MAX813L ONLY.

WATCHDOG

TIMER

TIMEBASE FOR

RESET AND

WATCHDOG

RESET

GENERATOR

MAX705
MAX706

MAX813L

3

GND

8

WDO

MR

7

RESET
(RESET)

5

PFO

V

PFI

V

CC

1

2

CC

4

* 4.40V FOR MAX7O6.

250µA

4.65V*

1.25V

RESET

GENERATOR

3

MAX707
MAX708

GND

8

RESET

7

RESET

5

PFO

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

Ensuring a Valid RESET

Output Down to V

CC

= 0V

When VCCfalls 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 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 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 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 VCCline. 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 resis­tors and transistor as shown, a high PFO triggers reset.
As long as PFO remains high, the MAX705­MAX708/MAX813L will keep reset asserted (RESET =
low, RESET = high). Note that this circuit’s accuracy
depends on the PFI threshold tolerance, the VCCline,
and the resistors.

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

_______________________________________________________________________________________ 7

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.

t

WP

t

WD

+5V

WDI

0V

+5V

WDO

0V

+5V

RESET

0V

RESET EXTERNALLY

V

RT

TRIGGERED BY MR

V

RT

+5V

(RESET)

0V

( ) ARE FOR MAX813L ONLY.

V

CC

+5V

RESET

0V

+5V

MR

0V

+5V

WDO

0V

t

WD

t

RS

MR EXTERNALLY DRIVEN LOW

t

WD

t

RS

t

RS

t

MD

t

MR

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

8 _______________________________________________________________________________________

Figure 7. Monitoring a Negative Voltage

Figure 8. Interfacing to µPs with Bidirectional Reset I/O

Figure 5. RESET Valid to Ground Circuit

Figure 6. Monitoring Both +5V and +12V

MAX70_

RESET

R1

+5V

V

CC

MAX70_

GND

MR

100kΩ

PFO

RESET

R1

PFI

R2

100kΩ

2N3904

TO µP

1MΩ

1%

130kΩ

1%

V

MAX70_

+12V

+12V Reset
Threshold at +25°C

CC

+5V

PARAMETER

RESET

V

RESET

CC

TO µP

MAX70_

MR

PFI

MIN TYP

10.67

BUFFERED RESET TO OTHER SYSTEM COMPONENTS

4.7kΩ

GND

10.87

PFO

MAX UNIT

11.50 V

RESET

V

CC

µP

V-

MR

PFO

+5V

+5V

0V

0V

−

5 1.25

R1

V-

1.25 V

=

−

R2

V

TRIP 0V

TRIP

,V

TRIP

0

<

GND

GND

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

_______________________________________________________________________________________ 9

__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)

____________________Chip Topography

( ) ARE FOR MAX813L ONLY.
TRANSISTOR COUNT: 572
SUBSTRATE MUST BE LEFT UNCONNECTED.

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.

TOP VIEW

(RESET) RESET

( ) ARE FOR MAX813L ONLY.

WDO

MR

V

RESET

RESET

MR

V

1

2

MAX705

3

MAX706

MAX813L

4

CC

µ

MAX

1

2

MAX707

3

MAX708

4

CC

µ

MAX

WDI

8

7

PFO

PFI

6

GND

5

N.C.

8

PFO

7

PFI

6

5

GND

MR

V

CC

GND

WDO/RESET

PFO

PFI

0.074"

(1.88mm)

RESET (RESET)

WDI/N.C.

0.051"

(1.30mm)

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

10 ______________________________________________________________________________________

1000-up ($)
Price

†

Pins

max (typ)
µA
Backup Mode

SUPPLY

I

max (typ)
mA
Operating Mode

SUPPLY

I

Output
Battery-On

Output
Low-Line

Input
Manual-Reset

Comparator
Power-Fail

Protect

Write

–C—E–
Max (Ω)

On Resistance

BATT

OUT

-to-V

V

Max (Ω)

OUT

Valid

= 1V

-to-V

CC

On Resistance

CC

V

Switch
Backup-Battery

Output
Watchdog
Separate

(sec), if Available
Timeout Period
Watchdog
Nominal

to V

–R—E—S—E—T–

Reset
Active-High

Reset
Active-Low

Pulse Width (ms)
Minimum Reset

Threshold (V)
Nominal Reset

Number

___________________________________________µP Supervisory Circuits

Part

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

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

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

2.63/2.93/3.08

MAX810L/M/R/S/T 4.65/4.40/ 140 ✔✔ 0.06(0.024) 3 ††

MAX813L 4.65 140 ✔✔1.6 ✔✔/±2% ✔ 0.35(0.2) 8 1.02*

2.63/2.93/3.08

MAX814K/L/N/T 4.80/4.70/4.55/3.03 140 ✔/±1% ✔/±1% ✔✔/±2% ✔✔ TBD TBD 8 ††

MXD1210 4.37/4.62 ✔ 2.5 667 ✔ 0.5(0.23) 0.1(0.002) 8 2.44

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

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

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

______________________________________________________________________________________ 11

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.

MAX705–MAX708/MAX813L

Low-Cost, µP Supervisory Circuits

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.

12

____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600

© 2010 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.

Revision History

REVISION

NUMBER

0 2/92 Initial release —

8 3/10

REVISION

DATE

DESCRIPTION

Updated the Features, Absolute Maximum Ratings, Typical Operating
Characteristics, Figures 3, 7, 8, and the Package Information sections.

PAGES

CHANGED

1, 2, 4, 7, 8, 10