Maxim > Products > Supervisors, Voltage Monitors, Sequencers > MAX6391, MAX6392

MAX6391, MAX6392

Dual-Voltage µP Supervisory Circuits with Sequenced Reset Outputs

Overview

Technical Documents

Ordering Info

Status

Active: In Production.

Description

The MAX6391/MAX6392 microprocessor (µP) supervisory circuits provide sequenced logic reset outputs for multicomponent or dual-voltage systems. Each device can monitor two supply voltages and time-sequence two reset outputs to control the order in which system components are turned on and off. The MAX6391/MAX6392 increase system reliability and reduce circuit complexity and cost compared to separate ICs or discrete components.

The MAX6391/MAX6392 monitor V_CC as the master reset supply. Both active-low RESET1 and active-low RESET2 are asserted whenever V_CC drops below the selected factory-fixed reset threshold voltage. RESET1 remains asserted as long as V_CC is below the threshold and deasserts 140ms (min) after V_CC exceeds the thresholds.

RESET IN2 is monitored as the secondary reset supply and is adjustable with an external resistive-divider network. Active-low RESET2 is asserted whenever either V_CC or RESET IN2 is below the selected thresholds. Active-low RESET2 remains asserted 140ms (min) or a capacitor-adjustable time period after V_CC and RESET IN2 exceed their thresholds. RESET2 is always deasserted after active-low RESET1 during system power-up and is always asserted before active-low RESET1 during power-down.

The MAX6391 includes two internal pullup resistors for active-low RESET1 and active-low RESET2 (the open-drain outputs can be externally connected to the desired pullup voltages). The MAX6392 includes an active-low manual reset input (MR) that asserts both active-low RESET1 (push-pull) and RESET2 (open drain).

The MAX6391/MAX6392 are available in small 8-pin SOT23 packages and are specified over the -40°C to +85°C extended temperature range.

Data Sheet

Download	Rev 2	(PDF, 216kB)
E-Mail

Key Features

Preset V_CC Reset Threshold Voltages from 1.58V to 4.63V (master supply)
Customer-Adjustable RESET IN2 to Monitor Voltages Down to 625mV (secondary supply)
Fixed (140ms min) active-low RESET1 Timeout
Fixed (140ms min) or Customer-Adjustable active-low RESET2 Timeout Period
Guaranteed Reset Valid to V_CC = 1V
Active-Low Open-Drain Outputs or Push-Pull/Open-Drain Combination
Internal Open-Drain Pullup Resistors (for external V_OH voltage connections)
Manual Reset Input (MAX6392 only)
Immune to Short Negative V_CC Transients
15µA Typical Supply Current
Few External Components
Small 8-Pin SOT23 Package

Applications/Uses

Computers: Desktop, Workstation, Server
Controllers
Critical µP Monitoring
Industrial Equipment
Multivoltage Monitoring
Printers
Servers and Workstations
Set-Top Boxes

Key Specifications:

Power-Supply Sequencers and Voltage Trackers

Part Number

Option

Interface

Input Chan.

V_IN
(V)

Features

Oper. Temp.
(°C)

Package/Pins

Smallest Available Pckg.
(mm²)

Budgetary Price

max

max w/pins

See Notes

MAX6391

Sequence

Factory Fixed

R/C Adjustable

Reset Output

-40 to +85

0 to +70

MAX6392

See All Power-Supply Sequencers and Voltage Trackers (55)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Supervisors (2 Monitored Voltages)

Part Number

Interface

Reset Thresh.
(V)

Reset Out

t_RESET

Watchdog Feature

Supervisor Features

Reset Thresh. Accur.
(%)

I_CC
(µA)

Budgetary Price

min

@ +25°C

max

See Notes

MAX6391

Factory Fixed

R/C Adjustable

0 to 1.2

1.2 to 1.8

1.8 to 2.5

2.5 to 3.3

3.3 to 5.5

Active Low

Open Drain

85ms to 300ms

300ms to 1s

>1s

Adjustable

No Watchdog

Adjustable Reset Input

1.5

$1.56 @1k

MAX6392

Active Low

Open Drain

Push-Pull

Adjustable Reset Input

Manual Reset

$1.56 @1k

See All Supervisors (2 Monitored Voltages) (84)

Diagram

Typical Operating Circuit

Application Notes

Tutorial 1133		Multiple Voltage Systems Need Supply-Voltage Sequencing
Application Note 2853		Supervisors in Multivoltage Systems

Product Guides

Microprocessor Supervisory (PDF)

Reliability Reports

Reliability Report:	MAX6392.pdf
Show FIT data for:
Request Reliability Report for:

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6391KA16+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA16+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA16-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6391KA17+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA17-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6391KA22+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA22-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6391KA23+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA23-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6391KA26+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6391KA26-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6391KA29+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA29+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA29-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6391KA31+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA31-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6391KA44+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA44-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6391KA46+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6391KA46+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6391KA46-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6392KA16+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA16-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6392KA17+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA17-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6392KA22+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA22+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA22-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6392KA23+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA23+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6392KA23-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6392KA26+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA26+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA26-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6392KA29+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA29-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6392KA31+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA31+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA31-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6392KA44+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
Part Number	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX6392KA44+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA44-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet
MAX6392KA46+			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA46+T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8+5*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX6392KA46-T			Active	SOT;8 pin;9 mm² Outline Drawing:21-0078 (PDF) Land Pattern: 90-0176 (PDF) Use pkgcode/variation: K8-5*	-40°C to +85°C	See data sheet

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day.
Part number suffixes: T or T&R = tape and reel; + = RoHS/lead-free; # = RoHS/lead-exempt; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product Naming Conventions.
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

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[ 2001-11-29 ]

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Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Document Ref.: 19-2210 Rev 2; 2006-04-04
This page last modified: 2008-05-01

Dual-Voltage µP Supervisory Circuits with Sequenced Reset Outputs

Status

Description

Data Sheet

Key Features

Applications/Uses

Key Specifications:

Diagram

Application Notes

Product Guides

Reliability Reports

Software/Models

Ordering Information

Similar Products by Function

Similar Products by Application

More Information

Didn't Find What You Need?

Information Index

Overview

Technical Documents

Ordering Info

Related Products