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

Adjustable, Sequencing/Supervisory Circuits

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9

Detailed Description

The MAX16025–MAX16030 are low-voltage, accurate,

dual-/triple-/quad-voltage microprocessor (µP) supervi-

sors in a small TQFN package. These devices provide

supervisory and sequencing functions for complex mul-

tivoltage systems. The MAX16025/MAX16026 monitor

two voltages, the MAX16027/MAX16028 monitor three

voltages, and the MAX16029/MAX16030 monitor four

voltages.

The MAX16025–MAX16030 offer independent outputs

and enable functions for each monitored voltage. This

configuration allows the device to operate as four sepa-

rate supervisory circuits or be daisy-chained together to

allow controlled sequencing of power supplies during

power-up initialization. When all of the monitored volt-

ages exceed their respective thresholds, an indepen-

dent 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.

Figure 2. Timing Diagram (CDLY_ Open)

IN_

EN_

OUT_

RESET