Ultra-Low-Voltage µP Reset Circuits and

Voltage Detectors

4

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Pin Description

Typical Operating Characteristics (continued)

vs. TEMPERATURE

TEMPERATURE (

°C)

60

40

20

0

-20

0.990

0.995

1.000

1.005

1.010

1.015

0.985

-40

80

NORMALIZED RESET IN THRESHOLD

vs. TEMPERATURE

TEMPERATURE (

°C)

60

40

20

0

-20

0.990

0.995

1.000

1.005

1.010

1.015

0.985

-40

80

POWER-UP/POWER-DOWN

CHARACTERISTICS (MAX6843AUKD3)

MAX6841-45 toc06

200ms/div

1V/div

RESET

1V/div

PIN

MAX6841

MAX6842

MAX6843

MAX6845

MAX6844

NAME

FUNCTION

1—

—

Push-Pull (MAX6841) or Open-Drain (MAX6842) Active-Low Reset Output.

RESET

exceeds the device reset threshold and

MR is released high.

—1

—

RESET

Push-Pull (MAX6843) or Open-Drain (MAX6845) Active-Low Reset Output.

RESET

changes from high to low when RESET IN drops below the 187.4mV reset

reset timeout period after RESET IN exceeds the reset threshold and

MR is

released high.

22

2

GND

Ground

3—

—

input drops below the selected reset threshold or

MR is pulled low. RESET

threshold and

MR is released high.

——

1

RESET

Push-Pull Active-High Reset Output. RESET changes from low to high when the

RESET remains high for the reset timeout period after RESET IN exceeds the reset

threshold.

—3

3

RESET IN

Adjustable Reset Input. High-impedance input for reset comparator. Connect this

pin to an external resistive-divider network to set the reset threshold voltage; the

its threshold voltage.

44

4

MR

Active-Low Manual Reset Input. Internal 20k

reset. Reset remains active as long as

MR is low and for the reset timeout period

after

55

5

Supply Voltage. Monitored supply for the MAX6841/MAX6842.