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 CC falls below the factory-set reset thresholds, the reset output asserts and remains assert-ed for a minimum reset timeout period after V CC 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 CC 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 and6-pinµDFN packages and the MAX6384–MAX6390 are available in 4-pin SC70 and





♦Factory-Set Reset Threshold Voltages Ranging

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


♦±2.5% Reset Threshold Accuracy Over

Temperature (-40°C to +125°C)

♦Seven Reset Timeout Periods Available: 1ms,

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

1200ms (min)

♦3 Reset Output Options

Active-Low Push-Pull

Active-High Push-Pull

Active-Low Open-Drain

♦Reset Output State Guaranteed Valid

Down to V CC= 1V

♦Manual Reset Input (MAX6384/MAX6385/MAX6386)

♦Auxiliary RESET IN


♦V CC Reset Timeout (1120ms or 1200ms)/Manual

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

♦Negative-Going V CC Transient Immunity

♦Low Power Consumption of 6µA at +3.6V

and 3µA at +1.8V

♦Pin Compatible with



and MAX6711/MAX6712/MAX6713

♦Tiny 3-Pin/4-Pin SC70 and 6-Pin µDFN Packages


SC70/µDFN, Single/Dual Low-Voltage,

Low-Power µP Reset Circuits

________________________________________________________________Maxim Integrated Products1

Pin Configurations

19-1839; Rev 4; 4/07

Ordering Information

Ordering Information continued at end of data sheet.

Typi cal Operati ng Ci rcui t appears at end of data sheet.

Selector Guide appears at end of data sheet.

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-free package.

For pricing, delivery, and ordering information,please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at



Intelligent Instruments

Critical µP and µC

Power Monitoring


Powered Equipment

Dual Voltage Systems