MAX6701A-03A datasheet(6/12 Pages) MAXIM

Part #	MAX6701A-03A

Description	Low-Voltage, SOT23 uP Supervisors with Power-Fail In/Out, Manual Reset, and Watchdog Timer

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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Detailed Description

Figures 1, 2, and 3 are functional diagrams for the

MAX6705(A)/MAX6706(A)/MAX6707(A), MAX6704/

MAX6708, and MAX6701(A)/ MAX6702(A)/MAX6703(A),

respectively.

Reset Output

A microprocessor’s (µP’s) reset input starts the µP in a

known state. The MAX6701–MAX6708 assert reset dur-

ing power-up and prevent code execution errors during

power-down or brownout conditions.

On power-up, once VCC reaches 1V, RESET is a guar-

anteed logic low of 0.4V or less. As VCC rises, RESET

stays low. After VCC, RST_IN1, or RST_IN2 rise above

the reset threshold, an internal timer holds RESET low

for about 200ms. RESET pulses low whenever VCC dips

below the reset threshold, including brownout condi-

tions. If a brownout occurs in the middle of a previously

initiated reset pulse, the pulse continues for at least

another 140ms. On power-down, once VCC falls below

the reset threshold, RESET stays low and is guaranteed

to be 0.4V or less, until VCC drops below 1V.

The MAX6702(A)/MAX6704/MAX6706(A)/MAX6708

active-high RESET output is the complement of the

RESET output, and is guaranteed to be valid with VCC

down to 1V.

Low-Voltage, SOT23 µP Supervisors with Power-

Fail In/Out, Manual Reset, and Watchdog Timer

6

_______________________________________________________________________________________

Pin Description (continued)

MAX6701(A)

MAX6702(A)

MAX6703(A)

MAX6704

MAX6705(A)

MAX6706(A)

MAX6707(A)

MAX6708

NAME

FUNCTION

8

—

8

—

WDO

Active-Low Watchdog Output (Open Drain or Push-Pull). WDO

is asserted whenever the watchdog times out and VCC or the

reset inputs are below their respective thresholds. WDO

deasserts after a valid WDI transition without a reset timeout

period. In the A versions, WDO deasserts without a timeout

delay when VCC, RST_IN1, and RST_IN2 rises above its

threshold. Pull MR low to assert WDO (MAX6701/MAX6702/

MAX6703/MAX6705/MAX6706/MAX6707 only). Pull MR low to

deassert WDO (MAX6701(A)/MAX6702(A)/MAX6703(A)/

MAX6705(A)/MAX6706(A)MAX6707(A) only).

7*

8

7*

8

RESET

Active-High Reset Output (Push-Pull). RESET changes from low

to high when the VCC input drops below the selected reset

threshold (or RST_IN1/RST_IN2 for MAX6701(A)/MAX6702(A)/

MAX6703(A), MR is pulled low, or the watchdog triggers a

reset (MAX6704 only). RESET remains high for the reset

timeout period after the reset conditions are terminated.

4

——

—

RST_IN1

Input for User-Adjustable VCC2 Monitor. High-impedance input

for second internal reset comparator. Connect this pin to an

external resistive-divider network to set the reset threshold

voltage; 0.62V (typ) threshold. Connect to VCC when not used.

Reset is asserted when either VCC, RST_IN1, or RST_IN2 are

below threshold.

5

——

—

RST_IN2

Input for User-Adjustable VCC3 Monitor. High-impedance input

for third internal reset comparator. Connect this pin to an

external resistive-divider network to set the reset threshold

voltage; 0.62V (typ) threshold. Connect to VCC when not used.

Reset is asserted when either VCC, RST_IN1, or RST_IN2 are

below threshold.

*RESET active-high for the MAX6702(A)/MAX6706(A).

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