Datasheet MAX813LMJA, MAX813LESA, MAX813LC-D, MAX813LCPA, MAX813LCSA Datasheet (Maxim)

19-4334; Rev. 5; 9/95

Low-Cost, µP Supervisory Circuits

_______________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

__________Typical Operating Circuit

___________________________Features

♦ µMAX Package: Smallest 8-Pin SO
♦ Guaranteed RESET Valid at VCC= 1V
♦ Precision Supply-Voltage Monitor

4.65V in MAX705/MAX707/MAX813L

4.40V in MAX706/MAX708

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

Manual-Reset Input

♦ Independent Watchdog Timer—1.6sec Timeout

(MAX705/MAX706)

♦ Active-High Reset Output

(MAX707/MAX708/MAX813L)

♦ Voltage Monitor for Power-Fail or Low-Battery

Warning

______________Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX705CPA

MAX705CSA 0°C to +70°C 8 SO
MAX705CUA 0°C to +70°C 8 µMAX
MAX705C/D 0°C to +70°C Dice*

Ordering Information continued at end of data sheet.

* Dice are specified at T
**Contact factory for availability and processing to MIL-STD-883.

0°C to +70°C

= +25°C.

A

8 Plastic DIP

_________________Pin Configurations

TOP VIEW

MR

V

GND

PFI

1
2

CC

3
4

MAX705
MAX706

MAX813L

WDO

8

RESET (RESET)

7

WDI

6
5

PFO

MAX705–MAX708/MAX813L

1
2
3
4

DIP/SO

MAX707
MAX708

DIP/SO

Maxim Integrated Products

UNREGULATED DC

PUSHBUTTON

SWITCH

MAX667

+5V DC LINEAR

REGULATOR

µP

V

V

CC

PFI

MAX705
MAX706

MR

MAX813L

________________________________________________________________



RESET

PFI

WDO

PFO

CC

RESET
I/O LINE

NMI
INTERRUPT

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

MR

V

GND

PFI

CC

Call toll free 1-800-998-8800 for free samples or literature.

RESET

8

RESET

7

N.C.

6
5

PFO

1

Low-Cost, µP Supervisory Circuits

ABSOLUTE MAXIMUM RATINGS

Terminal Voltage (with respect to GND)

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

V

CC

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

Input Current

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

V

CC

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

CC

+ 0.3V)

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

Continuous Power Dissipation

Plastic DIP (derate 9.09mW/°C above +70°C) ....... 727mW

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= T

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MAX70_C 1.0 5.5

Operating Voltage Range V

Supply Current I

MAX705–MAX708/MAX813L

Reset Threshold (Note 2) V
Reset Threshold Hysteresis (Note 2)

Reset Pulse Width (Note 2) t

RESET Output Voltage

RESET Output Voltage

Watchdog Timeout Period t
WDI Pulse Width t

WDI Input Threshold

Low
High

WDI Input Current

WDO Output Voltage

CC

SUPPLY

RT

RS

WD
WP

MAX70_E/M, MAX813LE/M 1.2 5.5
MAX705C, MAX706C, MAX813LC 150 350
MAX705E/M, MAX706E/M, MAX813LE/M 150 500
MAX707C, MAX708C 50 350
MAX707E/M, MAX708E/M 50 500
MAX705, MAX707, MAX813L 4.50 4.65 4.75
MAX706, MAX708 4.25 4.40 4.50

I

SOURCE

I

= 3.2mA 0.4

SINK

MAX70_C, VCC= 1V, I
MAX70_E/M, VCC= 1.2V, I
MAX707, MAX708, I
MAX707, MAX708, I
MAX813LC, I

MAX813LE/M, I
MAX813L

MAX705, MAX706, MAX813L
VIL= 0.4V, VIH= (VCC) (0.8) 50 ns
MAX705, MAX706, MAX813L,

= 5V

V

CC

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

MAX705, MAX706, MAX813L,
I

SOURCE

= 800µA

MAX705, MAX706, MAX813L,

= 1.2mA

I

SINK

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, 10sec) ................ +300°C

to T

MIN

, unless otherwise noted.)

MAX

40 mV

140 200 280 ms

= 800µA VCC- 1.5

0.3

0.3

0.4

SOURCE

SOURCE

= 50µA

SINK

= 100µA

SINK
SOURCE
SINK

= 800µA

= 1.2mA 0.4

= 4µA, VCC= 1.1V

= 4µA, VCC= 1.2V

I

SOURCE

I

SINK

= 800µA

= 3.2mA

VCC- 1.5

0.8

0.9

VCC- 1.5

1.00 1.60 2.25 sec

0.8

3.5

CC

50 150

VCC- 1.5

0.4

VMAX813LC 1.1 5.5

µA

V

V

V

V

µA

V

2 _______________________________________________________________________________________

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= T

PARAMETER

MR Pull-Up Current MR = 0V 100 250 600 µA
MR Pulse Width t

MR Input Threshold
MR to Reset Out Delay (Note 2) t

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

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

Low
High

SYMBOL CONDITIONS MIN TYP MAX UNITS

MR

MD

I

SOURCE

I

SINK

= 800µA VCC- 1.5

= 3.2mA 0.4

to T

MIN

150 ns

2.0

, unless otherwise noted.)

MAX

0.8

250 ns

MAX705–MAX708/MAX813L

V

V

_______________________________________________________________________________________ 3

Low-Cost, µP Supervisory Circuits

__________________________________________Typical Operating Characteristics

MAX705/MAX707

RESET OUTPUT VOLTAGE

V

RESET

vs. SUPPLY VOLTAGE

+5V

TA = +25°C

CC

0V

V

V

CC

CC

0V

500ms/div

RESET
GND

2k

RESET

330pF

1V/div

+5V
1V/div

+5V
V

+5V

RESET

CC

RESET RESPONSE TIME

V

V

CC



POWER-FAIL COMPARATOR

ASSERTION RESPONSE TIME

+5V

1V/div 50mV/div

0V

+1.20V

+5V

0V

+5V

0V

MAX705–MAX708/MAX813L

PFO

PFI

+1.25V

+1.30V

PFI

+5V

PFO

30pF

VCC = +5V

= +25°C

T

A

1k

RESET, RESET ASSERTION



MAX705/MAX707

CC

10k

RESET
GND

30pF

2µs/div

RESET



MAX707

VCC = VRT

= +25°C

T

A

V

CC

10k

RESET

RESET

GND

330pF

10k

TA = +25°C

330pF

+4V

1V/div

0V

RESET

1V/div

RESET

PFO

+1.20V

+5V

+5V

POWER-FAIL COMPARATOR

DE-ASSERTION RESPONSE TIME

+5V

PFI

+1.25V

0V

PFI

PFO

30pF 1k

400ns/div

MAX707

RESET, RESET DE-ASSERTION

VCC = VRT

= +25°C

T

A

V

CC

RESET
RESET

GND

10k

10k

330pF

0V

0V



VCC = +5V

= +25°C

T

A

+3V

+1.30V



RESET

2V/div

330pF

RESET

400ns/div

RESET

400ns/div

MAX707/MAX708/MAX813L

RESET OUTPUT VOLTAGE

vs. SUPPLY VOLTAGE

+5V

TA = +25°C

V

CC

V

0V

0V

CC

RESET

GND

10k

500ms/div

330pF

1V/div

+5V
1V/div

+5V

V

CC

0V

0V

RESET RESPONSE TIME

V

CC

RESET
GND



MAX813L

10k

330pF

2µs/div

400ns/div

+4V

+4V

4 _______________________________________________________________________________________

Low-Cost, µP Supervisory Circuits

______________________________________________________________Pin Description

PIN

MAX705/MAX706

µMAX

4
5

6

7

8

MAX707/MAX708

µMAX

4
5

6

7

-

DIP/SODIP/SODIP/SO

222

MAX813L

µMAX

NAME

Manual-Reset Input triggers a reset pulse when
pulled below 0.8V. This active-low input has an inter-

MR111 3 3 3

4
5

6

7

8

V

CC

PFI444

PFO555

WDI6-6

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.

+5V Supply Input
0V Ground Reference for all signalsGND333
Power-Fail Voltage Monitor Input. When PFI is less

than 1.25V, PFO

when not used.

V

CC

Power-Fail Output goes low and sinks current when
PFI is less than 1.25V; otherwise PFO

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.

FUNCTION

goes low. Connect PFI to GND or

stays high.

MAX705–MAX708/MAX813L

-

1

2

-

_______________________________________________________________________________________ 5

-

1

-

2

-

-

2

1

RESET-77

WDO8-8

RESET78-

No ConnectN.C.-6­Active-Low Reset Output pulses low for 200ms when

triggered, and stays low whenever V
reset threshold (4.65V in the MAX705 and 4.40V in the
MAX706). It remains low for 200ms after V
above the reset threshold or MR
(Figure 3). A watchdog timeout will not trigger RESET
unless WDO is connected to MR.

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
goes low during low-line conditions. Whenever V
below the reset threshold, WDO
unlike RESET
width. As soon as V
old, WDO

Active-High Reset Output is the inverse of RESET.
Whenever RESET
versa (Figure 2). The MAX813L has a RESET output
only.

, WDO does not have a minimum pulse

rises above the reset thresh-

goes high with no delay.

CC

is high, RESET is low, and vice

stays low; however,

is below the

CC

goes from low to high

CC

rises

also

CC

is

Low-Cost, µP Supervisory Circuits

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

GND

3

8

7

5

WDO

RESET
(RESET)

PFO

V

CC

1

MR

2

V

CC

4

PFI

* 4.40V FOR MAX7O6.

250µA

4.65V*

1.25V

RESET

GENERATOR

3

MAX707
MAX708

GND

8

RESET

7

RESET

5

PFO

Figure 1. MAX705/MAX706/MAX813L Block Diagram

_______________Detailed Description

MAX705–MAX708/MAX813L

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 VCCdips 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 VCCfalls
below the reset threshold, RESET stays low and is guar­anteed to be 0.4V or less until VCCdrops below 1V.

Reset Output

Figure 2. MAX707/MAX708 Block Diagram

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 VCCdrops 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.

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

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.

Manual Reset

6 _______________________________________________________________________________________

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.

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.

Figure 3. MAX705/MAX706/MAX813L Watchdog TIming

V

CC

+5V

RESET

0V

+5V

MR

0V

+5V

WDO

0V

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

WD

t

RS

MR EXTERNALLY DRIVEN LOW

t

WD

t

RS

t

RS

t

MD

t

MR

To build an early-warning circuit for power failure, con­nect the PFI pin to a voltage divider (see

Operating Circuit

). Choose the voltage divider ratio so

Typical

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 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

_______________________________________________________________________________________ 7

Low-Cost, µP Supervisory Circuits

MAX70_

RESET

R1

Figure 5. RESET Valid to Ground Circuit

+5V

V

CC

MAX70_

GND

MR

100k

PFO

RESET

MAX705–MAX708/MAX813L

R1

PFI

R2

100k

2N3904

TO µP

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

+12V

1M
1%

130k

1%

PARAMETER

+12V Reset
Threshold at +25°C

V

CC

MAX70_

RESET

+5V

V

RESET

CC

TO µP

MAX70_

MR

PFI

MIN TYP

10.67

BUFFERED RESET TO OTHER SYSTEM COMPONENTS

4.7k

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

TRIP

V

TRIP 0V

,V

TRIP

0

<

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

µPs with bidirectional reset pins, such as the Motorola

GND

Interfacing to µPs with

Bidirectional Reset Pins

68HC11 series, can contend with the MAX705-MAX708

Figure 7. Monitoring a Negative Voltage

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.

8 _______________________________________________________________________________________

GND

Low-Cost, µP Supervisory Circuits

__Ordering Information (continued)

PIN-PACKAGETEMP. RANGEPART

8 Plastic DIP-40°C to +85°CMAX705EPA
8SO-40°C to +85°CMAX705ESA
8 CERDIP**-55°C to +125°CMAX705MJA

MAX706CPA

MAX707CPA

MAX708CPA

MAX813LCPA

*Dice are specified at TA= +25°C.

**Contact factory for availability and processing to MIL-STD-883.

8 Plastic DIP0°C to +70°C
8SO0°C to +70°CMAX706CSA
8 µMAX0°C to +70°CMAX706CUA
Dice*0°C to +70°CMAX706C/D

8 Plastic DIP-40°C to +85°CMAX706EPA
8SO-40°C to +85°CMAX706ESA
8 CERDIP**-55°C to +125°CMAX706MJA
8 Plastic DIP0°C to +70°C
8SO0°C to +70°CMAX707CSA

8 µMAX0°C to +70°CMAX707CUA

Dice*0°C to +70°CMAX707C/D
8 Plastic DIP-40°C to +85°CMAX707EPA
8SO-40°C to +85°CMAX707ESA
8 CERDIP**-55°C to +125°CMAX707MJA
8 Plastic DIP0°C to +70°C
8SO0°C to +70°CMAX708CSA

8 µMAX0°C to +70°CMAX708CUA

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
8SO0°C to +70°CMAX813LCSA

8 µMAX0°C to +70°CMAX813LCUA

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°CMAX813LMJA

_______Pin Configuration (continued)

TOP VIEW

(RESET) RESET

WDO

MR

V

1
2

MAX705

3

MAX706

MAX813L

4

CC

WDI

8
7

PFO
PFI

6

GND

5

µMAX

RESET
RESET

MR

V

1
2

MAX707

3

MAX708

4

CC

N.C.

8

PFO

7

PFI

6
5

GND

µMAX

( ) ARE FOR MAX813L ONLY.

____________________Chip Topography

MR

V

CC

GND

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

WDO/RESET

PFO

PFI

0.074"

(1.88mm)

RESET (RESET)

WDI/N.C.

0.051"

(1.30mm)

MAX705–MAX708/MAX813L

_______________________________________________________________________________________ 9

Low-Cost, µP Supervisory Circuits

_______________________________________________________Package Information

C

A

0.101mm

e

A1B

E H

0.004 in

8-PIN µMAX

MICROMAX SMALL-OUTLINE

PACKAGE

D

MAX705–MAX708/MAX813L

DIM

A

α

L

A1

B
C
D

E

e
H

L

α

INCHES MILLIMETERS



MIN

0.036

0.004

0.010

0.005

0.116

0.116

0.188

0.016

MAX

0.044

0.008

0.014

0.007

0.120

0.120



0°



0.198

0.026
6°

MIN

0.91

0.10

0.25

0.13

2.95

2.95

4.78

0.41
0°

MAX

1.11

0.20

0.36

0.18

3.05

3.05

0.650.0256





5.03

0.66
6°

21-0036D

10 ______________________________________________________________________________________

OUT

OUT

Valid

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

V

-to-V

Max (Ω)
On Resistance

CC

-to-V

V

Switch
Backup-Battery

Output
Watchdog
Separate

(sec), if Available
Timeout Period
Watchdog
Nominal

CC

= 1V

to V
–R—E—S—E—T–

Reset
Active-High

Low-Cost, µP Supervisory Circuits

MAX705–MAX708/MAX813L

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

______________________________________________________________________________________ 11

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 ††

MAX809L/M/R/S/T 4.65/4.40/ 140 ✔✔ 0.06(0.024) 3 ††

MAX808L/N/M 4.68/4.58/4.43 140 ✔/±1.5% ✔✔TBD TBD ✔✔TBD TBD 16 ††

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

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.

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

Future product—contact factory for pricing and availability. Specifications are preliminary.

†

††

* 25,000 pc. price, factory direct

Low-Cost, µP Supervisory Circuits

MAX705–MAX708/MAX813L

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 [phone]

© 1995 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.