1.25

1.50

1.75

2.00

2.50

2.25

2.75

3.00

1.00

MR TO RESET OUTPUT PROPAGATION

DELAY vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

-40

85

Hex/Quad, Power-Supply Supervisory Circuits

4

_______________________________________________________________________________________

21

22

23

24

25

26

27

28

29

30

20

IN_ TO RESET OR OV

PROPAGATION DELAY vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

-40

85

100mV OVERDRIVE

1.525

1.550

1.575

1.600

1.650

1.625

1.675

1.700

1.500

WATCHDOG TIMEOUT PERIOD

vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

-40

85

0.998

0.997

0.996

0.999

1.000

1.001

1.003

1.002

1.004

1.005

0.995

NORMALIZED IN_ THRESHOLD

vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

-40

85

100

10

1

1000

MAXIMUM IN_ TRANSIENT

vs. IN_THRESHOLD OVERDRIVE

IN_ THRESHOLD OVERDRIVE (mV)

25

50

75

100

125

150

175

200

0

PO_ ASSERTION OCCURS

ABOVE THIS LINE

OUTPUT-VOLTAGE LOW vs. SINK CURRENT

SINK CURRENT (mA)

8

6

24

50

100

150

200

300

250

350

400

0

010

12

14

Pin Description

PIN

MAX6887

MAX6888

NAME

FUNCTION

11

RESET

Open-Drain, Active-Low Reset Output. RESET asserts when any input voltage falls below its

undervoltage threshold or when MR is pulled low. RESET remains low for 200ms after all

assertion-causing conditions are cleared. An external pullup resister is required.

22

WDO

Open-Drain, Active-Low Watchdog Timer Output. Logic output for the watchdog timer function.

WDO goes low when WDI is not strobed high-to-low or low-to-high within the watchdog timeout

period.

33

OV

Open-Drain Active-Low Overvoltage Output. OV asserts when any input voltage exceeds its

overvoltage threshold. OV remains low for 25µs after all overvoltage conditions are cleared.

An external pullup resistor is required.

4

4

GND

Ground

Typical Operating Characteristics (continued)