MAX6752KA16-T Maxim Integrated, MAX6752KA16-T Datasheet

MAX6752KA16-T

Manufacturer Part Number

MAX6752KA16-T

Description

Supervisory Circuits

Manufacturer

Maxim Integrated

Series

MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751, MAX6752, MAX6753r

Datasheet

1.MAX6746KA34-T.pdf (14 pages)

Specifications of MAX6752KA16-T

Number Of Voltages Monitored

Monitored Voltage

1.575 V to 5 V

Undervoltage Threshold

1.544 V

Overvoltage Threshold

1.607 V

Output Type

Active Low, Push-Pull

Manual Reset

Not Resettable

Watchdog

Battery Backup Switching

No Backup

Power-up Reset Delay (typ)

9.487 ms

Supply Voltage - Max

5.5 V

Maximum Operating Temperature

+ 125 C

Mounting Style

SMD/SMT

Package / Case

SOT-23

Chip Enable Signals

Maximum Power Dissipation

714 mW

Minimum Operating Temperature

- 40 C

Power Fail Detection

Supply Current (typ)

5 uA

Supply Voltage - Min

1 V

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The MAX6746–MAX6753 low-power microprocessor

(µP) supervisory circuits monitor single/dual system

supply voltages from 1.575V to 5V and provide maxi-

mum adjustability for reset and watchdog functions.

These devices assert a reset signal whenever the V

supply voltage or RESET IN falls below its reset thresh-

old or when manual reset is pulled low. The reset output

remains asserted for the reset timeout period after V

and RESET IN rise above the reset threshold. The reset

function features immunity to power-supply transients.

The MAX6746–MAX6753 have ±2% factory-trimmed

reset threshold voltages in approximately 100mV incre-

ments from 1.575V to 5.0V and/or adjustable reset

threshold voltages using external resistors.

The reset and watchdog delays are adjustable with

external capacitors. The MAX6746–MAX6751 contain a

watchdog select input that extends the watchdog time-

out period by 128x. The MAX6752/MAX6753 contain a

window watchdog timer that looks for activity outside an

expected window of operation.

The MAX6746–MAX6753 are available with a push-pull

or open-drain active-low RESET output. The MAX6746–

MAX6753 are available in an 8-pin SOT23 package and

are fully specified over the automotive temperature

range (-40°C to +125°C).

19-2530; Rev 6; 4/11

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.

Pin Configurations continued at end of data sheet.

Medical Equipment

Automotive

Intelligent Instruments

Portable Equipment

Battery-Powered

Computers/Controllers

TOP VIEW

( ) ARE FOR MAX6746 AND MAX6747 ONLY.

RESET IN (MR)

µP Reset Circuits with Capacitor-Adjustable

SWT

GND

SRT

________________________________________________________________ Maxim Integrated Products

General Description

MAX6746–

MAX6751

SOT23-8

Pin Configurations

Embedded Controllers

Critical µP Monitoring

Set-Top Boxes

Computers

Applications

RESET

WDI

WDS

Reset/Watchdog Timeout Delay

o Factory-Set Reset Threshold Options from 1.575V

o Adjustable Reset Threshold Options

o Single/Dual Voltage Monitoring

o Capacitor-Adjustable Reset Timeout

o Capacitor-Adjustable Watchdog Timeout

o Min/Max (Windowed) Watchdog Option

o Manual Reset Input Option

o Guaranteed RESET Valid for V

o 3.7µA Supply Current

o Push-Pull or Open-Drain RESET Output Options

o Power-Supply Transient Immunity

o Small 8-Pin SOT23 Packages

Selector Guide appears at end of data sheet.

Typical Operating Circuit appears at end of data sheet.

Note: “_ _” represents the two number suffix needed when

ordering the reset threshold voltage value for the

MAX6746/MAX6747 and MAX6750–MAX6753. The reset

threshold voltages are available in approximately 100mV incre-

ments. Table 2 contains the suffix and reset factory-trimmed

voltages. All devices are available in tape-and-reel only. There

is a 2500-piece minimum order increment for standard ver-

sions (see Table 3). 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.

/V Denotes an automotive qualified part.

MAX6746KA_ _-T

MAX6746KA_ _/V+T

MAX6747KA_ _-T

MAX6747KA_ _/V+T

MAX6748KA-T

MAX6749KA-T

MAX6750KA_ _-T

MAX6750KA_ _/V+T

MAX6751KA_ _-T

MAX6752KA_ _-T

MAX6753KA_ _-T

MAX6753KA_ _/V+T

to 5V in ~100mV Increments

PART

-40°C to +125°C

Ordering Information

TEMP RANGE

≥ 1V

PIN-PACKAGE

8 SOT23

Features

Related parts for MAX6752KA16-T

MAX6752KA16-T Summary of contents

Page 1

... SOT23 ARE FOR MAX6746 AND MAX6747 ONLY. Pin Configurations continued at end of data sheet. ________________________________________________________________ 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. Reset/Watchdog Timeout Delay o Factory-Set Reset Threshold Options from 1.575V ...

Page 2

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay ABSOLUTE MAXIMUM RATINGS V to GND ...........................................................-0.3V to +6.0V CC SRT, SWT, SET0, SET1, RESET IN, WDS, MR, WDI, to GND .......................................…-0. RESET (Push-Pull) to GND......................…-0. RESET (Open ...

Page 3

Reset Circuits with Capacitor-Adjustable ELECTRICAL CHARACTERISTICS (continued +1.2V to +5.5V MIN MAX PARAMETER SYMBOL Fast Watchdog Timeout Period, SET Ratio = 64, (MAX6752/MAX6753) Fast Watchdog Minimum Period (MAX6752/MAX6753) SWT Ramp ...

Page 4

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay (V = +5V +25°C, unless otherwise noted RESET TIMEOUT PERIOD vs. C SRT 1000 100 10 1 0.1 100 1000 10,000 100,000 C (pF) SRT NORMALIZED RESET TIMEOUT ...

Page 5

Reset Circuits with Capacitor-Adjustable (V = +5V +25°C, unless otherwise noted RESET DELAY CC vs. TEMPERATURE (V FALLING) CC 27.0 V FALLING AT 1mV/μs CC 26.6 26.2 25.8 25.4 25.0 -50 -25 0 ...

Page 6

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay PIN MAX6746 MAX6748– MAX6752 MAX6747 MAX6751 MAX6753 5 5 — — — _______________________________________________________________________________________ Pin Description (continued) NAME Watchdog Select Input. WDS ...

Page 7

Reset Circuits with Capacitor-Adjustable GUARANTEED TO ASSERT RESET WDI CONDITION 1 WDI CONDITION 2 WDI CONDITION 3 *UNDETERMINED STATES MAY OR MAY NOT GENERATE A FAULT CONDITION Figure 1. MAX6752/MAX6753 Detailed Watchdog Input Timing Relationship Detailed Description The MAX6746–MAX6753 ...

Page 8

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay V MON_TH R1 RESET IN MAX6748 R2 MAX6749 MAX6750 GND MAX6751 Figure 3. Adding an External Manual Reset Function to the MAX6748–MAX6751 where V is the desired reset threshold voltage MON_TH and ...

Page 9

Reset Circuits with Capacitor-Adjustable V CC WDI RESET OV EXTENDED MODE (WDS = Figure 4b. Watchdog Timing Diagram, WDS = V MAX6746–MAX6751 The watchdog’s circuit monitors the µP’s activity. It the µP does ...

Page 10

Reset Circuits with Capacitor-Adjustable Reset/Watchdog Timeout Delay t < t (MIN) WDI WD1 WDI RESET (a) FAST FAULT t > t (MAX) WDI WD2 WDI RESET (b) SLOW FAULT t (MAX) < t < t (MIN) WD1 WDI WD2 ...

Page 11

Reset Circuits with Capacitor-Adjustable Interfacing to Other Voltages for Logic Compatibility The open-drain RESET output can be used to interface to a µP with other logic levels. As shown in Figure 6, the open-drain output can be connected to ...

Page 12

... MAX6750KA16 3.978 MAX6750KA23 3.876 MAX6750KA26 3.774 MAX6750KA29 3.672 MAX6750KA46 3.570 MAX6751KA16 3.468 MAX6751KA23 3.366 MAX6751KA26 3.264 MAX6751KA29 3.137 MAX6751KA46 3.060 MAX6752KA16 2.984 MAX6752KA23 2.856 MAX6752KA26 2.754 MAX6752KA29 2.678 MAX6752KA46 2.550 MAX6753KA16 2.448 MAX6753KA23 2.359 MAX6753KA26 2.232 MAX6753KA29 2.142 MAX6753KA46 2.040 1.938 1 ...

Page 13

Reset Circuits with Capacitor-Adjustable FIXED V ADJUSTABLE CC PART RESET RESET THRESHOLD THRESHOLD MAX6746 X — MAX6747 X — MAX6748 — X MAX6749 — X MAX6750 X X MAX6751 X X MAX6752 X — MAX6753 X — Typical Operating ...

Page 14

... 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. 14 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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