MAX818MCUA datasheet(3/16 Pages) MAXIM

Part #	MAX818MCUA

Description	5V Microprocessor Supervisory Circuits

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Manufacturer	MAXIM [Maxim Integrated Products]

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ELECTRICAL CHARACTERISTICS (continued)

(VCC = +4.75V to +5.5V for MAX81_L, VCC = +4.5V to +5.5V for MAX81_M, VBATT = 2.8V, TA = TMIN to TMAX, unless otherwise

noted. Typical values are at TA = +25°C.)

+5V Microprocessor Supervisory Circuits

_______________________________________________________________________________________

3

V PFO = 0V

VPFI > 1.30V, ISOURCE = 40µA, VCC > 4.5V

MAX81_M

VPFI < 1.20V, ISINK = 3.2mA, VCC > 4.50V

MAX81_L

WDI = GND, time average

From VRST, VCC falling at 10V/ms

WDI = VCC, time average

VCC = 5V

MAX81_ _C, VCC = 1V, VCC falling,

VBATT = 0V, ISINK = 50µA

VCC > VRST(MAX), ISOURCE = 800µA

VCC < VRST(MIN), ISINK = 3.2mA

VIL = 0.4V, VIH = 0.8VCC

CONDITIONS

µA

250

500

PFO Short-Circuit Current

VCC - 1.5

VOH

PFO Output Voltage

V

0.4

VOL

nA

-25

0.01

25

IPFI

PFI Input Current

mV

4

PFI Input Hysteresis

V

1.20

1.25

1.30

VPFT

PFI Input Threshold

µA

-20

-15

WDI Input Current (Note 5)

120

160

V

3.5

VIH

WDI Input Threshold (Note 4)

0.8

VIL

ns

50

tWDI

WDI Pulse Width

V

4.25

4.40

4.50

VRST

Reset Threshold

4.50

4.65

4.75

sec

1.00

1.60

2.25

tWD

Watchdog Timeout Period

µs

100

VCC to RESET Delay

0.3

mV

25

Reset Threshold Hysteresis

ms

140

200

280

tRP

Reset Timeout Period

VCC - 1.5

VOH

0.4

VOL

UNITS

MIN

TYP

MAX

SYMBOL

PARAMETER

MAX81_ _E, VCC = 1.2V, VCC falling,

VBATT = 0V, ISINK = 100µA

V

0.3

RESET Output Voltage

0.8

V

2.0

VIL

MR Input Threshold

µs

1

MR Pulse Width

VIH

ns

100

MR Pulse that Would Not Cause

a Reset

ns

120

MR to Reset Delay

k

Ω

45

63

85

MR Pull-Up Resistance

RESET AND WATCHDOG TIMER

POWER-FAIL COMPARATOR (MAX817/MAX819 only)

MANUAL RESET INPUT (MAX819 only)

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