MAX6308 查看數據表（PDF） - Maxim Integrated

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MAX6308

5-Pin, Multiple-Input, Programmable Reset ICs

Maxim Integrated 

5-Pin, Multiple-Input,

Programmable Reset ICs

______________________________________________________________Pin Description

MAX6305

MAX6308

MAX6311

1

2

—

3, 4

—

—

5

PIN

MAX6306

MAX6309

MAX6312

1

2

3

—

4

—

5

MAX6307

MAX6310

MAX6313

1

2

—

—

3

4

5

NAME

FUNCTION

RESET

RESET

GND

MR

RST IN1,

RST IN2

RST IN

OVRST IN

VCC

Active-Low, Open-Drain Reset Output for the MAX6305/MAX6306/

MAX6307. Active-Low, Push/Pull Reset Output (sources and sinks

current) for the MAX6308/MAX6309/MAX6310.

Active-High, Push/Pull Reset Output for the MAX6311/MAX6312/MAX6313

System Ground

Manual-Reset Input. Pull low to force a reset. RESET/RESET remains

active as long as MR is low and for the timeout period after MR

goes high. Leave unconnected or connect to VCC if unused.

Undervoltage Reset Comparator Input. Asserts reset when the

monitored voltage falls below the programmed threshold. Set the

reset threshold with an external resistor divider. Connect to VCC if

unused.

Overvoltage Reset Comparator Input. Asserts reset when the monitored

voltage exceeds the programmed threshold. Set the reset threshold

with an external resistor divider. Connect to GND if unused.

System Supply. The MAX6306/MAX6307/MAX6309/MAX6310/

MAX6312/MAX6313 also monitor VCC through an internal factory-

trimmed resistor divider to the reset comparator.

_______________Detailed Description

The MAX6305–MAX6313 CMOS microprocessor (µP)

supervisory circuits are designed to monitor more than

one power supply and issue a system reset when any

monitored supply falls out of regulation. The MAX6305/

MAX6308/MAX6311 have two adjustable undervoltage

reset inputs (RST IN1 and RST IN2). The MAX6306/

MAX6307/MAX6309/MAX6310/MAX6312/MAX6313 mon-

itor VCC through an internal, factory-trimmed voltage

divider. The MAX6306/MAX6309/MAX6312 have, in

addition, an adjustable undervoltage reset input and a

manual-reset input. The internal voltage divider sets the

reset threshold as specified in the device part number

(Table 1). The MAX6307/MAX6310/ MAX6313 feature an

adjustable undervoltage reset input (RST IN) and an

adjustable overvoltage reset input (OVRST IN) in addition

to the factory-trimmed reset threshold on the VCC moni-

tor. Program the adjustable reset inputs with an external

resistor divider (see Adjustable Reset Inputs section).

Reset Outputs

A µP’s reset input starts the µP in a known state. These

µP supervisory circuits assert reset to prevent code-

execution errors during power-up, power-down, or

brownout conditions.

RESET (MAX6305–MAX6310) and RESET (MAX6311/

MAX6312/MAX6313) are guaranteed to be asserted at

a valid logic level for VCC > 1V (see Electrical

Characteristics). Once all monitored voltages exceed

their programmed reset thresholds, an internal timer

keeps reset asserted for the reset timeout period (tRP);

after this interval, reset deasserts.

If a brownout condition occurs (any or all monitored volt-

ages dip outside their programmed reset threshold),

reset asserts (RESET goes high; RESET goes low). Any

time any of the monitored voltages dip below their reset

threshold, the internal timer resets to zero and reset

asserts. The internal timer starts when all of the moni-

tored voltages return above their reset thresholds, and

reset remains asserted for a reset timeout period. The

MAX6305/MAX6306/MAX6307 feature an active-low,

_______________________________________________________________________________________ 5

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