diately after WDO is high. The initial watchdog timeout

period allows the µP to perform its initialization process.

ever WDI transitions from high to low after the initial

watchdog timeout period occurs. WDI monitors the tog-

gling output of the µP, indicating normal processor

behavior. If WDI does not toggle during the normal

processor has stopped operating or is stuck in an infinite

execution loop, WDO goes low. WDO stays low until the

next transition on WDI. An initial watchdog timeout peri-

If WDO is connected to MR, the WDO will assert for a

short duration (~5µs), long enough to assert the RESET

output. Asserting RESET clears the watchdog timer and

WDO goes high. The reset output will remain asserted

for its timeout period after a watchdog fault. The watch-

dog timer stays cleared as long as RESET is low.

Applications Information

Layout and Bypassing

For better noise immunity, bypass each of the voltage-

detector inputs to GND with 0.1µF capacitors installed

to GND with 1µF capacitors installed as close to the

and BP are internally generated voltages and should

not be used to supply power to external circuitry.

Hex/Quad, Power-Supply Supervisory Circuits

______________________________________________________________________________________

11

Selector Guide (continued)

NOMINAL INPUT

VOLTAGE (V)*

PART

IN1

IN2

IN3

IN4

TOLERANCE

(%)

MAX6888AETE

5.0

3.3

2.5

1.8

5

MAX6888BETE

5.0

3.3

2.5

Adj

5

MAX6888CETE

5.0

3.3

1.8

Adj

5

MAX6888DETE

3.3

2.5

1.8

1.5

5

MAX6888EETE

3.3

2.5

1.8

Adj

5

MAX6888FETE

3.3

2.5

1.5

Adj

5

MAX6888GETE

3.3

2.5

Adj

Adj

5

MAX6888HETE

3.3

1.8

Adj

Adj

5

MAX6888QETE

Adj

Adj

Adj

Adj

5

MAX6888IETE

5.0

3.3

2.5

1.8

10

MAX6888JETE

5.0

3.3

2.5

Adj

10

MAX6888KETE

5.0

3.3

1.8

Adj

10

MAX6888LETE

3.3

2.5

1.8

1.5

10

MAX6888METE

3.3

2.5

1.8

Adj

10

MAX6888NETE

3.3

2.5

1.5

Adj

10

MAX6888OETE

3.3

2.5

Adj

Adj

10

MAX6888PETE

3.3

1.8

Adj

Adj

10

MAX6888RETE

Adj

Adj

Adj

Adj

10

*

See thresholds options tables (Tables 1 and 2) for actual under-

voltage and overvoltage thresholds.

Chip Information

PROCESS: BiCMOS

Package Information

For the latest package outline information and land patterns, go

to www.maxim-ic.com/packages. Note that a "+", "#", or "-" in

the package code indicates RoHS status only. Package draw-

ings may show a different suffix character, but the drawing per-

tains to the package regardless of RoHS status.

PACKAGE TYPE

PACKAGE CODE

DOCUMENT NO.

16-TQFN-EP

T1655+2

21-0140