Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - system monitor Reset/power-on reset SC 70 4

General Description

The MAX6381–MAX6390 microprocessor (µP) supervisory

circuits monitor power-supply voltages from +1.8V to

+5.0V while consuming only 3µA of supply current at

+1.8V. Whenever V

falls below the factory-set reset

thresholds, the reset output asserts and remains assert-

ed for a minimum reset timeout period after V

rises

above the reset threshold. Reset thresholds are available

from +1.58V to +4.63V, in approximately 100mV incre-

ments. Seven minimum reset timeout delays ranging

from 1ms to 1200ms are available.

The MAX6381/MAX6384/MAX6387 have a push-pull

active-low reset output. The MAX6382/MAX6385/

MAX6388 have a push-pull active-high reset output,

and the MAX6383/MAX6386/MAX6389/MAX6390

have an open-drain active-low reset output. The

MAX6384/MAX6385/MAX6386 also feature a

debounced manual reset input (with internal pullup

resistor). The MAX6387/MAX6388/MAX6389 have an

auxiliary input for monitoring a second voltage. The

MAX6390 offers a manual reset input with a longer V

reset timeout period (1120ms or 1200ms) and a shorter

manual reset timeout (140ms or 150ms).

The MAX6381/MAX6382/MAX6383 are available in

3-pin SC70 and 6-pin µDFN packages and the

MAX6384–MAX6390 are available in 4-pin SC70 and

6-pin µDFN packages.

Features

o Factory-Set Reset Threshold Voltages Ranging

from +1.58V to +4.63V in Approximately 100mV

Increments

o ±2.5% Reset Threshold Accuracy Over

Temperature (-40°C to +125°C)

o Seven Reset Timeout Periods Available: 1ms,

20ms, 140ms, 280ms, 560ms, 1120ms,

1200ms (min)

o 3 Reset Output Options

Active-Low Push-Pull

Active-High Push-Pull

Active-Low Open-Drain

o Reset Output State Guaranteed Valid

Down to V

= 1V

o Manual Reset Input (MAX6384/MAX6385/MAX6386)

o Auxiliary RESET IN (MAX6387/MAX6388/MAX6389)

o V

Reset Timeout (1120ms or 1200ms)/Manual

Reset Timeout (140ms or 150ms) (MAX6390)

o Negative-Going V

Transient Immunity

o Low Power Consumption of 6

µµ

A at +3.6V

and 3

µµ

A at +1.8V

o Pin Compatible with

MAX809/MAX810/MAX803/MAX6326/MAX6327/

MAX6328/MAX6346/MAX6347/MAX6348,

and MAX6711/MAX6712/MAX6713

o Tiny 3-Pin/4-Pin SC70 and 6-Pin

µµ

DFN Packages

MAX6381–MAX6390

SC70/µDFN, Single/Dual Low-Voltage,

Low-Power µP Reset Circuits

RESET

(RESET)

GND

MAX6381

MAX6382

MAX6383

TOP VIEW

SC70

( ) IS FOR MAX6382

123

654

GND V

N.C.

N.CN.C.

MAX6381

MAX6382

MAX6383

µDFN

RESET

(RESET)

PART TEMP RANGE

PIN-

PACKAGE

MAX6381LT_ _D_+T

-40°C to +125°C

6 µDFN

MAX6381XR_ _D_+T

-40°C to +125°C

3 SC70

M AX 6381X R_ _D _/V + T

-40°C to +125°C

3 SC70

MAX6382LT_ _D_+T

-40°C to +125°C

6 µDFN

MAX6382XR_ _D_+T

-40°C to +125°C

3 SC70

Pin Configurations

19-1839; Rev 5; 7/12

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Ordering Information

Pin Configurations continued at end of data sheet.

Ordering Information continued at end of data sheet.

Typical Operating Circuit appears at end of data sheet.

Selector Guide appears at end of data sheet.

Note: Insert reset threshold suffix (see Reset Threshold table)

after "XR", "XS", or "LT." Insert reset timeout delay (see Reset

Timeout Delay table) after "D" to complete the part number.

Sample stock is generally held on standard versions only (see

Standard Versions table). Standard versions have an order

increment requirement of 2500 pieces. Nonstandard versions

have an order increment requirement of 10,000 pieces.

Contact factory for availability of nonstandard versions.

Denotes a lead(Pb)-free/RoHS-compliant package.

/V denotes an automotive qualified part.

Computers

Controllers

Intelligent Instruments

Critical µP and µC

Power Monitoring

Portable/Battery-

Powered Equipment

Dual Voltage Systems

Applications

Summary of content (10 pages)

PAGE 1
9-1839; Rev 5; 7/12 SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits Features The MAX6381–MAX6390 microprocessor (µP) supervisory circuits monitor power-supply voltages from +1.8V to +5.0V while consuming only 3µA of supply current at +1.8V. Whenever VCC falls below the factory-set reset thresholds, the reset output asserts and remains asserted for a minimum reset timeout period after VCC rises above the reset threshold. Reset thresholds are available from +1.58V to +4.
PAGE 2
MAX6381–MAX6390 SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits ABSOLUTE MAXIMUM RATINGS VCC to GND ..........................................................-0.3V to +6.0V RESET Open-Drain Output....................................-0.3V to +6.0V RESET, RESET (push-pull output) ..............-0.3V to (VCC + 0.3V) MR, RESET IN.............................................-0.3V to (VCC + 0.3V) Input Current (VCC) .............................................................
PAGE 3
SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits (VCC = full range, TA = -40°C to +125°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MR Minimum Input Pulse Width MIN MR Glitch Rejection VTHRST Open-Drain RESET Output Voltage Open-Drain RESET Output Leakage Current ns 32 63 100 kΩ MAX6390 500 1560 3000 Ω TA = +25°C 1.245 1.27 TA = 0°C to +85°C 1.232 1.308 TA = -40°C to +125°C 1.219 1.
PAGE 4
Typical Operating Characteristics (TA = +25°C, unless otherwise noted.) VCC = +5.5V 6 VCC = +3.6V 5 4 3 VCC = +2.5V VCC = +1.8V 2 VCC = +3V 39 37 35 VCC = +1.8V 33 31 29 1 27 0 1.06 1.04 1.02 1.00 0.98 0.96 0.94 25 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) NORMALIZED RESET THRESHOLD vs. TEMPERATURE OUTPUT-VOLTAGE LOW vs. SINK CURRENT OUTPUT-VOLTAGE HIGH vs. SOURCE CURRENT MAX6381/90 toc04 1.2 1.
PAGE 5
SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits PIN 3-PIN SC70 µDFN 1 (MAX6382/ MAX6385/ MAX6388) 1 (MAX6381/ MAX6383/ MAX6384/ MAX6386/ MAX6387/ MAX6390) 2, 3, 5 (MAX6381/ MAX6382/ MAX6383) 4-PIN SC70 MAX6384/ MAX6381/ MAX6387/ MAX6382 MAX6386/ MAX6385 MAX6388 MAX689 MAX6383 MAX6390 NAME Active-High Push-Pull Reset Output. RESET changes from low to high when any monitored voltage (VCC or VRESETIN) drops below the reset threshold or MR is pulled low.
PAGE 6
MAX6381–MAX6390 SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits Detailed Description RESET Output A µP 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 asserts when VCC is below the reset threshold; once VCC exceeds the reset threshold, an internal timer keeps the reset output asserted for the reset timeout period. After this interval, reset output deasserts.
PAGE 7
SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits VCC VIN MAX6387 MAX6388 MAX6389 R1 MAX6381 MAX6384 MAX6387 RESET (RESET) RESET IN R2 RESET GND R1 100k GND ( ) IS FOR MAX6388 Figure 1. RESET IN Configuration Figure 2.
PAGE 8
MAX6381–MAX6390 SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits Selector Guide PART NUMBER PUSH-PULL ACTIVE-LOW MAX6381 X PUSH-PULL ACTIVE-HIGH MAX6382 OPEN-DRAIN ACTIVE-LOW MANUAL RESET INPUT MR RESET IN X MAX6383 X MAX6384 X X MAX6385 X X MAX6386 X X MAX6390* X X MAX6387 X X MAX6388 X MAX6389 X X X *The MAX6390 offers a VCC reset timeout of 1120ms or 1200ms (min) and a manual reset timeout of 140ms or 150ms (min).
PAGE 9
SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits TOP VIEW GND 1 GND N.C. 6 5 4 4 VCC MAX6384 MAX6385 MAX6386 MAX6390 MAX6384 MAX6385 MAX6386 MAX6390 RESET (RESET) VCC 1 2 2 3 N.C. MR 3 MR RESET (RESET) µDFN SC70 ( ) IS FOR MAX6385 ( ) IS FOR MAX6385 GND 1 4 VCC GND N.C. 6 5 1 2 3 2 3 N.C.
PAGE 10
SC70/µDFN, Single/Dual Low-Voltage, Low-Power µP Reset Circuits MAX6381–MAX6390 Revision History REVISION REVISION NUMBER DATE 0 10/00 3 12/05 Added lead-free notation to Ordering Information. 4 4/07 Added µDFN package to data sheet. 5 7/12 Added automotive package to Ordering Information. DESCRIPTION Initial release PAGES CHANGED — 1, 8 1, 2, 5, 7–13 1 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product.