Maxim Integrated MAX813LCUA+ Linear IC MAX813LCUA+ Data Sheet

TOP VIEW

1

2

3

4

8

7

6

5

WDO

RESET (RESET)

WDI

PFO

PFI

GND

V

CC

MR

1

2

3

4

8

7

6

5

RESET

RESET 

N.C.

PFO

PFI

GND

V

CC

MR

V

CC

PFI

MR

PFO

WDO

RESET

UNREGULATED DC

PUSHBUTTON

SWITCH

PFI

I/O LINE

INTERRUPT

µP

+5V DC LINEAR

REGULATOR

V

CC

RESET

NMI

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.

Computers
Controllers
Intelligent Instruments
Automotive Systems
Critical µP Power Monitoring

♦ µMAX Package: Smallest 8-Pin SO
♦ Guaranteed RESET Valid at V

♦ Precision Supply-Voltage Monitor

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

♦ Independent Watchdog Timer—1.6sec Timeout

♦ Active-High Reset Output

♦ Voltage Monitor for Power-Fail or Low-Battery

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 T

**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