Dual-/Triple-/Quad-Voltage, Capacitor-

Adjustable, Sequencing/Supervisory Circuits

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7

Pin Description (continued)

PIN

MAX16041

MAX16042

MAX16043

NAME

FUNCTION

11

14

17

OUT1

Output 1. When the voltage at IN1 is below its threshold or EN1 goes low,

OUT1 goes low.

12

15

18

RESET

Active-Low Reset Output.

RESET asserts low when any of the monitored

voltages (IN_) falls below its respective threshold, any EN_ goes low, or

MR is

asserted.

RESET remains asserted for the reset timeout period after all of the

monitored voltages exceed their respective threshold, all EN_ are high, all

OUT_ are high, and

MR is deasserted.

13

16

19

MR

Active-Low Manual Reset Input. Pull

MR low to assert RESET low. RESET

remains low for the reset timeout period after

MR is deasserted (as long as all

OUT_ are high).

14

17

20

CRESET

Capacitor-Adjustable Reset Delay Input. Connect an external capacitor from

default 140ms minimum reset timeout period. Leave CRESET open for internal

propagation delay.

—

—

21

CDLY4

Capacitor-Adjustable Delay Input 4. Connect an external capacitor from

CDLY4 to GND to set the IN4 to OUT4 (and EN4 to OUT4) delay period.

Leave CDLY4 open for internal propagation delay.

—

18

22

CDLY3

Capacitor-Adjustable Delay Input 3. Connect an external capacitor from

CDLY3 to GND to set the IN3 to OUT3 (and EN3 to OUT3) delay period.

Leave CDLY3 open for internal propagation delay.

15

19

23

CDLY2

Capacitor-Adjustable Delay Input 2. Connect an external capacitor from

CDLY2 to GND to set the IN2 to OUT2 (and EN2 to OUT2) delay period.

Leave CDLY2 open for internal propagation delay.

16

20

24

CDLY1

Capacitor-Adjustable Delay Input 1. Connect an external capacitor from

CDLY1 to GND to set the IN1 to OUT1 (and EN1 to OUT1) delay period.

Leave CDLY1 open for internal propagation delay.

——

—

EP

Exposed Pad. EP is internally connected to GND. Connect EP to the

ground plane.

Detailed Description

The MAX16041/MAX16042/MAX16043 are low-voltage,

accurate, dual-/triple-/quad-voltage microprocessor

(µP) supervisors in a small TQFN package. These

devices provide supervisory and sequencing functions

for complex multivoltage systems. The MAX16041 mon-

itors two voltages, the MAX16042 monitors three volt-

ages, and the MAX16043 monitors four voltages.

The MAX16041/MAX16042/MAX16043 offer indepen-

dent outputs and enable functions for each monitored

voltage. This configuration allows the device to operate as

four separate supervisory circuits or be daisy-chained

together to allow controlled sequencing of power supplies

during power-up initialization. When all of the monitored

voltages exceed their respective thresholds, an inde-

pendent reset output deasserts to allow the system

processor to operate.

These devices offer enormous flexibility as there are

nine threshold options that are selected through two

threshold-select logic inputs. Each monitor circuit also

offers an independent enable input to allow both digital

and analog control of each monitor output. A tolerance

select input allows these devices to be used in systems

requiring 5% or 10% power-supply tolerances. In addi-

tion, the time delays and reset timeout can be adjusted

using small capacitors. There is also a fixed 140ms

minimum reset timeout feature.