Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsPMIC - system monitor Dual voltage detector SOT 23 6

General Description

The MAX6443–MAX6452 low-current microprocessor

reset circuits feature single or dual manual reset inputs

with an extended setup period. Because of the extended

setup period, short switch closures (nuisance resets) are

ignored.

On all devices, the reset output asserts when any of

the monitored supply voltages drops below its specified

threshold. The reset output remains asserted for the reset

timeout period (210ms typ) after all monitored supplies

exceed their reset thresholds. The reset output is one-

shot pulse asserted for the reset timeout period (140ms

min) when selected manual reset input(s) are held low for

an extended setup timeout period. These devices ignore

manual reset transitions of less than the extended setup

timeout period.

The MAX6443–MAX6448 are single fixed-voltage µP

supervisors. The MAX6443/MAX6444 have a single

extended manual reset input. The MAX6445/MAX6446

have two extended manual reset inputs. The MAX6447/

MAX6448 have one extended and one immediate manual

reset input.

The MAX6449–MAX6452 have one fixed-threshold µP

supervisor and one adjustable-threshold µP supervisor.

The MAX6449/MAX6450 have two delayed manual reset

inputs. The MAX6451/MAX6452 have one delayed and

one immediate manual reset input.

The MAX6443–MAX6452 have an active-low RESET with

push-pull or open-drain output logic options. These devic-

es, offered in small SOT packages, are fully guaranteed

over the extended temperature range (-40°C to +85°C).

Applications

● Set-Top Boxes

● Consumer Electronics

● DVD Players

● Cable/DSL Modems

● MP3 Players

● Industrial Equipment

● Automotive

● Medical Devices

Features

● Single- or Dual-Supply Voltage Monitors

● Precision Factory-Set Reset Thresholds from

1.6V to 4.6V

● Adjustable Threshold to Monitor Voltages Down to

0.63V (MAX6449–MAX6452)

● Single or Dual Manual Reset Inputs with Extended

Setup Period

● Optional Short Setup Time Manual Reset Input

(MAX6447/MAX6448 and MAX6451/MAX6452)

● Immune to Short Voltage Transients

● Low 6µA Supply Current

● Guaranteed Valid Reset Down to V

= 1.0V

● Active-Low RESET (Push-Pull or Open-Drain)

Outputs

● 140ms (min) Reset Timeout Period

● Small SOT143 and SOT23 Packages

Note: The first “_ _” is a placeholder for the threshold volt-

age level of the devices. A desired threshold level is set by

the two-number suffix found in Table 1. The third “_” is a

placeholder for the manual reset setup period of the devices.

A desired setup period is set by the letter suffix found in Table

2. All devices are available in tape-and-reel only. There is a

2500-piece minimum order increment for standard versions

(Table 2). Sample stock is typically held on standard versions

only. Nonstandard versions require a minimum order increment

of 10,000 pieces. Contact factory for availability.

Devices are available in both leaded and lead(Pb)-free packag-

ing. Specify lead-free by replacing “-T” with “+T” when ordering.

/V denotes an automotive qualified part.

*Future product—contact factory for availability.

PART TEMP RANGE PIN-PACKAGE

MAX6443US_ _ _-T -40°C to +85°C 4 SOT143

MAX6444US_ _ _-T -40°C to +85°C 4 SOT143

MAX6444US_ _ _/V+T* -40°C to +85°C 4 SOT143

MR1

RESET

GND

MAX6443

MAX6444

SOT143

TOP VIEW

MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset

Setup Period

19-2656; Rev 4; 3/14

Pin Configurations continued at end of data sheet.

Ordering Information continued at end of data sheet.

Pin Congurations

Ordering Information

Summary of content (13 pages)

PAGE 1
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period General Description The MAX6443–MAX6452 low-current microprocessor reset circuits feature single or dual manual reset inputs with an extended setup period. Because of the extended setup period, short switch closures (nuisance resets) are ignored. On all devices, the reset output asserts when any of the monitored supply voltages drops below its specified threshold.
PAGE 2
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period Absolute Maximum Ratings (All voltages referenced to GND.) VCC .........................................................................-0.3V to +6V Open-Drain RESET .................................................-0.3V to +6V Push-Pull RESET ..................................... -0.3V to (VCC + 0.3V) MR1, MR2, MR2, RSTIN .........................................-0.3V to +6V Input Current, All Pins.....................................
PAGE 3
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period Electrical Characteristics (continued) (VCC = 1.0V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.
PAGE 4
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period Typical Operating Characteristics (VCC = 3.3V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. SUPPLY VOLTAGE 5 4 TA = -40°C 3 2 1 1.00 0.99 0.98 0.97 MAX6443/52 toc03 MAX6443/52 toc02 1.01 200 150 RESET OCCURS ABOVE THE CURVE 100 50 VTH = 4.4V -40 -15 10 35 60 0 85 0 200 400 600 800 1000 RESET THRESHOLD OVERDRIVE (mV) NORMALIZED VCC RESET THRESHOLD vs. TEMPERATURE VCC TO RESET DELAY vs.
PAGE 5
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period Pin Description PIN MAX6443 MAX6444 MAX6445 MAX6446 MAX6447 MAX6448 MAX6449 MAX6450 MAX6451 MAX6452 NAME 1 2 2 2 2 GND 2 1 1 1 1 3 — 3 — 3 RESET MR1 — 3 — 3 — 4 4 4 4 4 FUNCTION Ground Active-Low Push-Pull or Open-Drain Output.
PAGE 6
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period Manual Reset Input Options Unlike typical manual reset functions associated with supervisors, each device in the MAX6443–MAX6452 family includes at least one manual reset input, which must be held logic-low for an extended setup period (tMR) before the RESET output asserts. When valid manual reset input conditions/setup periods are met, the RESET output is one-shot pulse asserted low for a fixed reset timeout period (140ms min).
PAGE 7
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period t < 210ms COUNTER RESET 210ms DEBOUNCING PERIOD POSITIVE EDGE t = 210ms MR2 210ms TIMEOUT PERIOD MR2 NO RESET OUTPUT ASSERTED RESET RESET Figure 3. MAX6447/MAX6448/MAX6451/MAX6452 MR2 Assertion DebouncingTiming Diagram VCC VMON_TH Figure 4. MAX6447/MAX6448/MAX6451/MAX6452 MR2 Deassertion Debouncing Timing Diagram +3.
PAGE 8
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period +3.3V +1.5V 3.3V 5V CORE SUPPLY I/O SUPPLY VCC RESET MAX6451 RSTIN VCC µP MR1 GND RESET DIGITAL INPUT MAX6444 MAX6446 MAX6448 MAX6450 MAX6452 MR2 SMART CARD DETECT: IMMEDIATE ONE-SHOT WHEN MANUAL RESET CLOSES 100kΩ RESET µP RESET N GND FRONT-PANEL SWITCH STANDARD µP INPUT AND tMR MANUAL RESET DELAY Figure 7. MAX6451/MAX6452 Application Circuit Figure 8.
PAGE 9
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period VCC MAX6443 MAX6445 MAX6447 MAX6449 MAX6451 VCC RESET 100kΩ GND The area below the curves of the graph is the region in which these devices typically do not generate a reset pulse. This graph was generated using a falling pulse applied to VCC, starting above the actual reset threshold (VTH) and ending below it by the magnitude indicated (reset threshold overdrive).
PAGE 10
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period Pin Configurations (continued) TOP VIEW RESET 1 GND 2 5 MR2 MAX6445 MAX6446 MR1 3 RESET 1 GND 2 4 VCC RESET 1 GND 2 MAX6449 MAX6450 MR1 3 RESET 1 6 MR2 5 RSTIN GND 2 4 VCC MR1 3 Ordering Information (continued) TEMP RANGE PIN-PACKAGE MAX6445UK_ _ _-T -40°C to +85°C 5 SOT23 MAX6446UK_ _ _-T -40°C to +85°C 5 SOT23 MAX6447UK_ _ _-T -40°C to +85°C 5 SOT23 MAX6448UK_ _ _-T -40°C to +85°C 5 SOT23 MAX6449
PAGE 11
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period Selector Guide PART MR1 EXT. SETUP MR2 (NO SETUP) MR2 EXT.
PAGE 12
MAX6443–MAX6452 Chip Information PROCESS: BiCMOS www.maximintegrated.com µP Reset Circuits with Long Manual Reset Setup Period Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO.
PAGE 13
MAX6443–MAX6452 µP Reset Circuits with Long Manual Reset Setup Period Revision History REVISION NUMBER REVISION DATE PAGES CHANGED 0 10/02 Initial release 3 6/10 Revised the General Description, Features, Applications, Ordering Information, Absolute Maximum Ratings, Electrical Characteristics, Typical Operating Characteristics, Pin Description, the Manual Reset Input Options, Interrupt Before Reset, and Smart Card Insertion/Removal sections, Functional Diagram, Typical Operating Circuit, Selector