MAX804TMJA datasheet(10/12 Pages) MAXIM

Part #	MAX804TMJA

Description	3.0V/3.3V Microprocessor Supervisory Circuits

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Manufacturer	MAXIM [Maxim Integrated Products]

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3.0V/3.3V Microprocessor Supervisory Circuits

10

______________________________________________________________________________________

MAX690T/S/R

MAX704T/S/R

MAX802T/S/R

MAX804T/S/R

MAX805T/S/R

MAX806T/S/R

VCC

GND

0V

TO

µP

VL = R1 VPFT

PFI

PFO

R1

R2

R3

*OPTIONAL

C1*

VIN

VTRIP

VIN

PFO

0V

VH

VL

R1 + R2

R2

VH = (VPFT + VPFH) (R1)

VTRIP = VPFT

+

R1

1

+

R2

1

R3

1

–

R3

VCC

VPFT = 1.237V

VPFH = 10mV

WHERE

VCC

GND

TO

µP

PFI

PFO

R1

R2

R3

*OPTIONAL

C1*

VIN

R1 + R2

R2

VH = R1 (VPFT + VPFH)

VTRIP = VPFT

+

R1

1

+

R2

1

R3

1

–

R3

(VCC - VD)

VPFT = 1.237V

VPFH = 10mV

VD = DIODE FORWARD VOLTAGE DROP

VL = VTRIP

WHERE

MAX690T/S/R

MAX704T/S/R

MAX802T/S/R

MAX804T/S/R

MAX805T/S/R

MAX806T/S/R

0V

PFO

0V

VH

VIN

VTRIP

b

a

(

)

(

)

(

)

(

)

+

R1

1

+

R2

1

R3

1

(

)

MAX690T/S/R

MAX704T/S/R

MAX802T/S/R

MAX804T/S/R

MAX805T/S/R

MAX806T/S/R

VCC

GND

PFI

PFO

R1

R2

V-

0V

V-

PFO

VTRIP

VL

VPFT = 1.237V

VPFH = 10mV

WHERE

3.0V OR 3.3V

VTRIP = R2

+

R1

1

)

(

R2

1

–

R1

VCC

(VPFT + VPFH)

VL = R2

+

R1

1

)

(

R2

1

–

R1

VCC

(VPFT)

NOTE: VTRIP IS NEGATIVE

VCC

MAX690T/S/R

MAX704T/S/R

MAX802T/S/R

MAX804T/S/R

MAX805T/S/R

MAX806T/S/R

VCC

GND

PFI

PFO

R1

R2

PFO

VTRIP

VH

* MAX704T/S/R,

MAX806T/S/R ONLY

3.0V OR 3.3V

VIN

VTRIP =

)

(

R2

R1 + R2

VPFT

VH = (VPFT + VPFH)

VCC

VIN

MR

*

b

a

)

(

R2

R1 + R2

Figure 4. a) Adding Additional Hysteresis to the Power-Fail Comparator

b) Shifting the Additional Hysteresis above VPFT

Figure 5. Using the Power-Fail Comparator to Monitor an Additional Power Supply

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