MAX817MCSA 查看數據表（PDF） - Maxim Integrated

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MAX817MCSA

+5V Microprocessor Supervisory Circuits

Maxim Integrated 

+5V Microprocessor Supervisory Circuits

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.)

PARAMETER

SYMBOL

CONDITIONS

MIN TYP MAX UNITS

RESET AND WATCHDOG TIMER

Reset Threshold

VRST

MAX81_L

MAX81_M

4.50 4.65 4.75

V

4.25 4.40 4.50

Reset Threshold Hysteresis

25

mV

Reset Timeout Period

tRP

VOH

VCC > VRST(MAX), ISOURCE = 800µA

VCC < VRST(MIN), ISINK = 3.2mA

140

200

280

ms

VCC - 1.5

0.4

RESET Output Voltage

MAX81_ _C, VCC = 1V, VCC falling,

VOL

VBATT = 0V, ISINK = 50µA

0.3

V

VCC to RESET Delay

Watchdog Timeout Period

WDI Pulse Width

WDI Input Threshold (Note 4)

WDI Input Current (Note 5)

MAX81_ _E, VCC = 1.2V, VCC falling,

VBATT = 0V, ISINK = 100µA

From VRST, VCC falling at 10V/ms

tWD

tWDI VIL = 0.4V, VIH = 0.8VCC

VIL

VIH

VCC = 5V

WDI = VCC, time average

WDI = GND, time average

0.3

100

µs

1.00 1.60 2.25 sec

50

ns

0.8

V

3.5

120

160

µA

-20

-15

POWER-FAIL COMPARATOR (MAX817/MAX819 only)

PFI Input Threshold

PFI Input Hysteresis

VPFT

1.20 1.25 1.30

V

4

mV

PFI Input Current

IPFI

-25 0.01

25

nA

PFO Output Voltage

VOL

VOH

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

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

VCC - 1.5

0.4

V

PFO Short-Circuit Current

V P FO = 0V

250

500

µA

MANUAL RESET INPUT (MAX819 only)

MR Input Threshold

VIL

VIH

MR Pulse Width

0.8

V

2.0

1

µs

MR Pulse that Would Not Cause

a Reset

100

ns

MR to Reset Delay

MR Pull-Up Resistance

120

ns

45

63

85

kΩ

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