MAX6447UK17L-T Maxim Integrated, MAX6447UK17L-T Datasheet

MAX6447UK17L-T

Manufacturer Part Number

MAX6447UK17L-T

Description

Supervisory Circuits

Manufacturer

Maxim Integrated

Series

MAX6443, MAX6444, MAX6445, MAX6446, MAX6447, MAX6448, MAX6449, MAX6450, MAX6451, MAX6452r

Datasheet

1.MAX6452UT44L-T.pdf (13 pages)

Specifications of MAX6447UK17L-T

Number Of Voltages Monitored

Monitored Voltage

1 V to 5.5 V

Undervoltage Threshold

1.62 V

Overvoltage Threshold

1.71 V

Output Type

Active Low, Push-Pull

Manual Reset

Resettable

Watchdog

No Watchdog

Battery Backup Switching

No Backup

Power-up Reset Delay (typ)

280 ms

Supply Voltage - Max

5.5 V

Maximum Operating Temperature

+ 85 C

Mounting Style

SMD/SMT

Package / Case

SOT-23

Chip Enable Signals

Maximum Power Dissipation

571 mW

Minimum Operating Temperature

- 40 C

Power Fail Detection

Supply Current (typ)

7 uA

Supply Voltage - Min

1 V

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The MAX6443–MAX6452 low-current microprocessor

reset circuits feature single or dual manual reset inputs

with an extended setup period. Because of the extend-

ed 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

devices, offered in small SOT packages, are fully guar-

anteed over the extended temperature range (-40°C to

+85°C).

19-2656; Rev 3; 6/10

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.

Set-Top Boxes

Consumer Electronics

DVD Players

Cable/DSL Modems

MP3 Players

Industrial Equipment

Automotive

Medical Devices

µP Reset Circuits with Long Manual Reset

________________________________________________________________ Maxim Integrated Products

General Description

Applications

o Single- or Dual-Supply Voltage Monitors

o Precision Factory-Set Reset Thresholds from

o Adjustable Threshold to Monitor Voltages Down

o Single or Dual Manual Reset Inputs with Extended

o Optional Short Setup Time Manual Reset Input

o Immune to Short Voltage Transients

o Low 6µA Supply Current

o Guaranteed Valid Reset Down to V

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

o 140ms (min) Reset Timeout Period

o Small SOT143 and SOT23 Packages

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

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-free packaging.

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

MAX6443US_ _ _-T

MAX6444US_ _ _-T

Pin Configurations continued at end of data sheet.

1.6V to 4.6V

to 0.63V (MAX6449–MAX6452)

Setup Period

(MAX6447/MAX6448 and MAX6451/MAX6452)

Outputs

TOP VIEW

PART

RESET

GND

-40°C to +85°C

Ordering Information

TEMP RANGE

Setup Period

SOT143

MAX6443

MAX6444

Pin Configurations

MR1

PIN-PACKAGE

4 SOT143

Features

= 1.0V

Related parts for MAX6447UK17L-T

MAX6447UK17L-T Summary of contents

Page 1

... DVD Players Cable/DSL Modems MP3 Players Industrial Equipment Automotive Medical Devices ________________________________________________________________ Maxim Integrated Products 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. o Single- or Dual-Supply Voltage Monitors o Precision Factory-Set Reset Thresholds from 1.6V to 4.6V o Adjustable Threshold to Monitor Voltages Down to 0.63V (MAX6449– ...

Page 2

Reset Circuits with Long Manual Reset Setup Period ABSOLUTE MAXIMUM RATINGS All Voltages Referenced to GND V ..........................................................................-0.3V to +6V CC Open-Drain RESET ..................................................-0.3V to +6V Push-Pull RESET ........................................-0. MR1, MR2, MR2, RSTIN ..........................................-0.3V to +6V Input ...

Page 3

Reset Circuits with Long Manual Reset ELECTRICAL CHARACTERISTICS (continued 1.0V to 5.5V -40°C to +85°C, unless otherwise specified. Typical values are PARAMETER SYMBOL MR2 Minimum Setup Period Pulse Width MR2 Glitch ...

Page 4

Reset Circuits with Long Manual Reset Setup Period (V = 3.3V +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE +85° +25° ...

Page 5

... The reset output is typically connected to the reset input of a microprocessor (µP). A µP’s reset input starts or restarts the µ known state. The MAX6443– MAX6452 µP supervisory circuits provide the reset logic to prevent code-execution errors during power- up, power-down and brownout conditions (see the Typical Operating Circuit ) ...

Page 6

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 ...

Page 7

Reset Circuits with Long Manual Reset t < 210ms COUNTER RESET t = 210ms MR2 RESET Figure 3. MAX6447/MAX6448/MAX6451/MAX6452 MR2 Assertion DebouncingTiming Diagram V MON_TH MAX6449 R1 MAX6451 RSTIN V R2 GND RESET V = 0.63 x (R1 + ...

Page 8

Reset Circuits with Long Manual Reset Setup Period +3.3V +1.5V V RESET CC MAX6451 RSTIN MR1 MR2 GND SMART CARD DETECT: IMMEDIATE ONE-SHOT WHEN MANUAL RESET CLOSES Figure 7. MAX6451/MAX6452 Application Circuit a microprocessor for general-purpose I/O control. MR2 ...

Page 9

Reset Circuits with Long Manual Reset V CC MAX6443 V CC MAX6445 MAX6447 MAX6449 MAX6451 RESET GND Figure 9. Ensuring RESET Valid Table 1. Reset Voltage Threshold PART NO. SUFFIX ( ...

Page 10

Reset Circuits with Long Manual Reset Setup Period TOP VIEW RESET GND MR1 RESET GND MR1 Ordering Information (continued) PART TEMP RANGE MAX6445UK_ _ _-T -40°C to +85°C MAX6446UK_ _ _-T -40°C to +85°C MAX6447UK_ _ _-T -40°C to ...

Page 11

Reset Circuits with Long Manual Reset MR1 EXT. PART SETUP (NO SETUP) ✔ MAX6443 ✔ MAX6444 ✔ MAX6445 ✔ MAX6446 ✔ MAX6447 ✔ MAX6448 ✔ MAX6449 ✔ MAX6450 ✔ MAX6451 ✔ MAX6452 V CC RSTIN MAX6449– MAX6452 V CC ...

Page 12

Reset Circuits with Long Manual Reset Setup Period Chip Information PROCESS: BiCMOS 12 ______________________________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code ...

Page 13

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 © 2010 Maxim Integrated Products ...

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