4-Pin, Ultra-Low-Voltage, Low-Power

µP Reset Circuits with Manual Reset

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5

GND

MAX6336

RESET

MR

100k

(a)

GND

MAX6335

RESET

100k*

(b)

*ASSUMES HIGH-Z RESET INPUT TO THE

µP

MR

* Factory-trimmed reset thresholds are available in approximately

100mV increments, with a ±1.8% room-temperature variance.

MIN

TYP

MAX

MIN

MAX

MAX633_US25D_

2.46 2.50

2.55

2.43

2.58

MAX633_US24D_

2.36 2.40

2.44

2.33

2.47

MAX633_US23D_

2.26 2.30

2.34

2.23

2.37

MAX633_US22D_

2.16 2.20

2.24

2.13

2.27

MAX633_US21D_

2.06 2.10

2.14

2.04

2.16

MAX633_US20D_

1.96 2.00

2.04

1.94

2.06

MAX633_US19D_

1.87 1.90

1.93

1.84

1.96

MAX633_US18D_

1.77 1.80 1.83

1.75

1.85

MAX633_US17D_

1.67 1.70 1.73

1.65

1.75

MAX633_US16D_

1.57 1.60

1.63

1.55

1.65

RESET

THRESHOLD

SUFFIX

Table 1. Factory-Trimmed Reset

Thresholds*

(Figure 2a). The pull-down resistor value is not critical;

100k

Ω is large enough not to load RESET, and small

enough to pull it low. For the MAX6335, where RESET

Ω pull-up resistor

Since the MAX6337 has an open-drain, active-low out-

put, it typically uses a pull-up resistor. With this device,

RESET will most likely not maintain an active condition,

but will drift to a non-active level due to the pull-up

resistor and the reduced sinking capability of the open-

drain device. Therefore, this device is not recommend-

ed for applications where the RESET pin is required to