MAX6385XS__D_+T datasheet(7/10 Pages) MAXIM

Part #	MAX6385XS__D_+T

Description	SC70/μDFN, Single/Dual Low-Voltage, Low-Power μP Reset Circuits

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Manufacturer	MAXIM [Maxim Integrated Products]

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a negative-going pulse applied to VCC, starting above

the actual reset threshold and ending below it by the

magnitude indicated (reset comparator overdrive). The

graph indicates the typical maximum pulse width a neg-

ative-going VCC transient may have without causing a

reset pulse to be issued. As the magnitude of the tran-

sient increases (goes farther below the reset threshold),

the maximum allowable pulse width decreases. A 0.1µF

capacitor mounted as close as possible to VCC provides

additional transient immunity.

Ensuring a Valid RESET

Output Down to VCC = 0V

The MAX6381–MAX6390 are guaranteed to operate

properly down to VCC = 1V. In applications that require

valid reset levels down to VCC = 0V, a pulldown resistor

to active-low outputs (push/pull only, Figure 2) and a

pullup resistor to active-high outputs (push/pull only)

will ensure that the reset line is valid while the reset out-

put can no longer sink or source current. This scheme

does not work with the open-drain outputs of the

MAX6383/MAX6386/MAX6389/MAX6390. The resistor

value used is not critical, but it must be small enough

not to load the reset output when VCC is above the

reset threshold. For most applications, 100k

Ω is ade-

quate.

SC70/µDFN, Single/Dual Low-Voltage,

Low-Power µP Reset Circuits

7

MAX6387

MAX6388

MAX6389

RESET IN

( ) IS FOR MAX6388

R1

R2

RESET

(RESET)

GND

VCC

VIN

MAX6381

MAX6384

MAX6387

VCC

R1

100k

RESET

GND

Figure 1. RESET IN Configuration

Figure 2. RESET Valid to VCC = Ground Circuit

PART

RESET

THRESHOLD

RESET TIMEOUT

46

44

31

29

26

23

22

17

MAX638_

16

D3

46

44

31

29

26

23

22

17

MAX6390

16

D4

Standard Versions

Reset Timeout Delay

SUFFIX

MIN

D1

1ms

D2

20ms

D3

140ms

D5

280ms

D6

560ms

D4

1120ms

D7

1200ms

MAX6390_ _D4

1120/140ms*

MAX6390_ _D7

1200/150ms*

*

The MAX6390 has a 1120ms or 1200ms RESET timeout and a

140ms or 150ms manual reset timeout.

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MAX6385XS__D_+T Datasheet(PDF) 7 Page - Maxim Integrated Products

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