MAX6323AUT29 MAXIM [Maxim Integrated Products], MAX6323AUT29 Datasheet

MAX6323AUT29

Manufacturer Part Number

MAX6323AUT29

Description

uP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX6323AUT29.pdf (13 pages)

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Bonase Electronics (HK) Co., Limited

Part Number:

MAX6323AUT29+T

Manufacturer:

MAXIM

Quantity:

100

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The MAX6323/MAX6324 microprocessor (µP) supervi-

sory circuits monitor power supplies and µP activity in

digital systems. A watchdog timer looks for activity out-

side an expected window of operation. Six laser-

trimmed reset thresholds are available with ±2.5%

accuracy from +2.32V to +4.63V. Valid RESET output is

guaranteed down to V

The RESET output is either push-pull (MAX6323) or

open-drain (MAX6324). RESET is asserted low when

reset input (MR) is asserted low. RESET remains assert-

ed for at least 100ms after V

threshold and MR is deasserted.

The watchdog pulse output (WDPO) utilizes an open-

drain configuration. It can be triggered either by a fast

timeout fault (watchdog input pulses are too close to

each other) or a slow timeout fault (no watchdog input

pulse is observed within the timeout period). The

watchdog timeout is measured from the last falling

edge of watchdog input (WDI) with a minimum pulse

width of 300ns. WDPO is asserted for 1ms when a fault

is observed. Eight laser-trimmed timeout periods are

available.

The MAX6323/MAX6324 are offered in a 6-pin SOT23

package and operate over the extended temperature

range (-40°C to +125°C).

19-1838; Rev 5; 5/10

Typical Operating Circuit appears at end of data sheet.

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.

TOP VIEW

falls below the reset threshold, or when the manual

Automotive

Industrial

Medical

Embedded Control Systems

GND

WDI

________________________________________________________________ Maxim Integrated Products

µP Supervisory Circuits with Windowed

(Min/Max) Watchdog and Manual Reset

General Description

MAX6323

MAX6324

SOT23

= +1.2V.

Pin Configuration

rises above the reset

Applications

RESET

WDPO

o Min/Max (Windowed) Watchdog,

o Pulsed Open-Drain, Active-Low Watchdog Output

o Power-On Reset

o Precision Monitoring of +2.5V, +3.0V, +3.3V,

o Open-Drain or Push-Pull RESET Outputs

o Low-Power Operation (23µA typ)

o Debounced Manual Reset Input

o Guaranteed Reset Valid to V

*These devices are factory trimmed to one of eight watchdog-

timeout windows and one of six reset voltage thresholds. Insert

the letter corresponding to the desired watchdog-timeout window

(A, B, C, D, E, F, G, or H) into the blank following the number

6323 or 6324 (see Watchdog Timeout table). Insert the two-digit

code (46, 44, 31, 29, 26, or 23) after the letters UT for the desired

nominal reset threshold (see Reset Threshold Range table at end

of data sheet).

/V denotes an automotive qualified part.

Devices are available in both leaded and lead-free packaging.

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

Note: There are eight standard versions of each device available

(see Standard Versions table). Sample stock is generally held on

standard versions only. Standard versions have an order incre-

ment requirement of 2500 pieces. Nonstandard versions have an

order increment requirement of 10,000 pieces. Contact factory for

availability of nonstandard versions.

Ordering Information continued at end of data sheet.

* See Figure 1 for operation.

MAX6323_UT_ _-T

SUFFIX

8 Factory-Trimmed Timing Options

and +5.0V Power Supplies

PART

MAX

719

1.5

WATCHDOG TIMEOUT*

FAST

-40°C to +125°C

Ordering Information

RANGE

TEMP

UNITS

Watchdog Timeout

= +1.2V

PIN-

PACKAGE

6 SOT23

MIN

100

300

1.3

Features

SLOW

UNITS

Push-Pull

OUTPUT

RESET

Related parts for MAX6323AUT29

MAX6323AUT29 Summary of contents

Page 1

Rev 5; 5/10 µP Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset General Description The MAX6323/MAX6324 microprocessor (µP) supervi- sory circuits monitor power supplies and µP activity in digital systems. A watchdog timer looks for activity out- side ...

Page 2

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) V ..................................................................-0.3V to +6.0V CC MR, RESET (MAX6323), WDI................-0. WDPO, RESET (MAX6324) ..............................-0.3V to +6.0V , WDI, MR ..............................................20mA ...

Page 3

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset ELECTRICAL CHARACTERISTICS (continued full range -40°C to +125°C, unless otherwise noted. Typical values are PARAMETER SYMBOL WATCHDOG INPUT AND OUTPUT Watchdog Timeout ...

Page 4

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset (V = full range +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE 5. 3. ...

Page 5

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset (V = full range +25°C, unless otherwise noted FAST WATCHDOG TIMEOUT PERIOD WDI WDPO 500µs/div PIN NAME Active-Low, Manual Reset Input. When MR is asserted low, ...

Page 6

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset t (min) WD1 POSSIBLE STATES GUARANTEED TO ASSERT WDPO CONDITION 1 CONDITION 2 CONDITION 3 * UNDETERMINED STATES MAY OR MAY NOT GENERATE A FAULT CONDITION. Figure 1. Detailed Watchdog ...

Page 7

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset RESET WDI WDPO Figure 2. Fast Fault Timing RESET WDI WDPO Figure 3. Slow Fault Timing RESET WDI H WDPO L Figure 4. Normal Operation, WDPO Not Asserted _______________________________________________________________________________________ t ...

Page 8

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset V CC 100ms (min) RESET MR Figure 5. RESET Timing Relationship falls below the preset threshold or when the manual reset input (MR) is asserted. The RESET output remains asserted ...

Page 9

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset MAX6323 RESET GND Figure 6. RESET Valid Ground Circuit CC Interfacing to µPs with Bidirectional Reset Pins Since the RESET output on the ...

Page 10

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset START SET WDI LOW SUBROUTINE OR PROGRAM LOOP SET WDI HIGH RETURN END Figure 9. Watchdog Flow Diagram V CC 500pF *MAX6324 ONLY Figure 10. WDPO to MR Loopback Circuit ...

Page 11

... Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset Standard Versions MAX6323AUT29 MAX6323AUT46 MAX6323CUT29 MAX6323CUT46 MAX6323DUT29 MAX6323DUT46 MAX6323HUT29 MAX6323HUT46 Ordering Information (continued) TEMP PART RANGE MAX6324_UT_ _-T -40°C to +125°C MAX6324_UT_ _-T/V -40°C to +125° 6324_U T_ _+ T/V -40°C to +125°C *These devices are factory trimmed to one of eight watchdog- timeout windows and one of six reset voltage thresholds ...

Page 12

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset V CC 500pF *MAX6324 ONLY For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS ...

Page 13

Supervisory Circuits with Windowed (Min/Max) Watchdog and Manual Reset REVISION REVISION NUMBER DATE 0 10/00 Initial release 5 5/10 Updated the Ordering Information and Absolute Maximum Ratings. Maxim cannot assume responsibility for use of any circuitry other than circuitry ...

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