MAX6730A MAXIM [Maxim Integrated Products], MAX6730A Datasheet

MAX6730A

Manufacturer Part Number

MAX6730A

Description

Single-/Dual-/Triple-Voltage ?P Supervisory Circuits with Independent Watchdog Output

Manufacturer

MAXIM [Maxim Integrated Products]

Datasheet

1.MAX6730A.pdf (16 pages)

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The MAX6730A–MAX6735A single-/dual-/triple-voltage

microprocessor (µP) supervisors feature a watchdog

timer and manual reset capability. The MAX6730A–

MAX6735A offer factory-set reset thresholds for moni-

toring voltages from +0.9V to +5V and an adjustable

reset input for monitoring voltages down to +0.63V. The

combination of these features significantly improves

system reliability and accuracy when compared to sep-

arate ICs or discrete components.

The active-low reset output asserts and remains asserted

for the reset timeout period after all the monitored volt-

ages exceed their respective thresholds. Multiple factory-

set reset threshold combinations reduce the number of

external components required. The MAX6730A/

MAX6731A monitor a single fixed voltage, the MAX6732A/

MAX6733A monitor two fixed voltages, and the

MAX6734A/MAX6735A monitor two fixed voltages and one

adjustable voltage. All devices are offered with six mini-

mum reset timeout periods ranging from 1.1ms to 1120ms.

The MAX6730A–MAX6735A feature a watchdog timer

with an independent watchdog output. The watchdog

timer prevents system lockup during code execution

errors. A watchdog startup delay of 54s after reset

asserts allows system initialization during power-up.

The watchdog operates in normal mode with a 1.68s

delay after initialization. The MAX6730A/MAX6732A/

MAX6734A provide an active-low, open-drain watch-

dog output. The MAX6731A/MAX6733A/MAX6735A

provide an active-low, push-pull watchdog output.

Other features include a manual reset input (MAX6730A/

MAX6731A/MAX6734A/MAX6735A) and push-pull reset

output (MAX6731A/MAX6733A/MAX6735A) or open-

drain reset output (MAX6730A/MAX6732A/MAX6734A).

The MAX6730A–MAX6733A are offered in a tiny 6-pin

SOT23 package. The MAX6734A/MAX6735A are offered

in an 8-pin, space-saving SOT23 package. All devices

are fully specified over the extended -40°C to +125°C

temperature range.

19-0605; Rev 0; 8/06

Typical Operating Circuit and Pin Configurations appear at

end of data sheet.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Multivoltage Systems

Telecom/Networking Equipment

Computers/Servers

Portable/Battery-Operated Equipment

Industrial Equipment

Printer/Fax

Set-Top Boxes

Circuits with Independent Watchdog Output

Single-/Dual-/Triple-Voltage µP Supervisory

________________________________________________________________ Maxim Integrated Products

General Description

Applications

♦ V

♦ Adjustable RSTIN Threshold for Monitoring Voltages

♦ Six Reset Timeout Options

♦ Watchdog Timer with Independent Watchdog Output

♦ Manual Reset Input (MAX6730A/MAX6731A/

♦ Guaranteed Reset Valid down to

♦ Push-Pull RESET or Open-Drain RESET Output

♦ Immune to Short V

♦ Low Supply Current: 14µA (typ) at +3.6V

♦ Small 6-Pin and 8-Pin SOT23 Packages

All devices specified over the -40°C to +125°C operating tem-

perature range.

*Note: Insert the threshold level suffixes for V

(Table 1) after “UT” or “KA.” For the MAX6730A/MAX6731A,

insert only the V

reset timeout delay (Table 2) after “D” to complete the part num-

ber. For example, the MAX6732AUTLTD3-T provides a V

threshold of +4.625V, a V

210ms reset timeout period. Sample stock is generally held on

standard versions only (see the Standard Versions table).

Standard versions have an order increment requirement of 2500

pieces. Nonstandard versions have an order increment require-

ment 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.

MAX6730AUT_D_ -T

MAX6731AUT_D_ -T

MAX6732AUT_ _D_ -T

MAX6733AUT_ _D_ -T

MAX6734AKA_ _D_ -T

MAX6735AKA_ _D_ -T

from +1.575V to +4.63V

Voltages from +0.79V to +3.08V

Down to +0.63V (MAX6734A/MAX6735A Only)

MAX6734A/MAX6735A)

35s (min) Initial Watchdog Startup Period

1.12s (min) Normal Watchdog Timeout Period

1 (Primary Supply) Reset Threshold Voltages

2 (Secondary Supply) Reset Threshold

1 or V

PART*

2 = +0.8V

1 threshold suffix after the “UT.” Insert the

Ordering Information

PIN-PACKAGE

6 SOT23-6

8 SOT23-8

2 threshold of +3.075V, and a

Transients

Features

1 and V

PKG CODE

K8S-3

U6-1

Related parts for MAX6730A

MAX6730A Summary of contents

Page 1

... All devices specified over the -40°C to +125°C operating tem- perature range. *Note: Insert the threshold level suffixes for V (Table 1) after “UT” or “KA.” For the MAX6730A/MAX6731A, Applications insert only the V reset timeout delay (Table 2) after “D” to complete the part num- ber ...

Page 2

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ABSOLUTE MAXIMUM RATINGS 2, RSTIN, MR, WDI to GND .....................-0. RST, WDO to GND (open drain)...............................-0.3V to +6V RST, WDO to GND (push-pull) .................-0.3V to ...

Page 3

... V CC Reset Timeout Period ADJUSTABLE RESET COMPARATOR INPUT (MAX6734A/MAX6735A) RSTIN Input Threshold RSTIN Input Current RSTIN Hysteresis RSTIN to Reset Output Delay MANUAL RESET INPUT (MAX6730A/MAX6731A/MAX6734A/MAX6735A) MR Input Threshold MR Minimum Pulse Width MR Glitch Rejection MR to Reset Output Delay MR Pullup Resistance _______________________________________________________________________________________ SYM ...

Page 4

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ELECTRICAL CHARACTERISTICS (continued +0.8V to +5.5V -40°C to +125°C, unless otherwise noted. Typical values are PARAMETER SYM B O ...

Page 5

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ( +5V +3.3V +25°C, unless otherwise noted SUPPLY CURRENT vs. TEMPERATURE ( +5V +3.3V ...

Page 6

... RESET THRESHOLD OVERDRIVE (mV) 24 75mV OVERDRIVE 110 125 MR TO RESET OUTPUT DELAY MAX6730A-35A toc08 1000 40ns/div RSTIN TO RESET OUTPUT DELAY vs. TEMPERATURE -40 -25 - 110 125 TEMPERATURE (°C) MR 2V/div RST 2V/div ...

Page 7

... NAME Active-Low Reset Output. The MAX6730A/MAX6732A/MAX6734A provide an open-drain output. The MAX6731A/MAX6733A/MAX6735A provide a push-pull RST output. RST asserts low when any of the following conditions occur drops below its preset threshold, RSTIN drops below its reset threshold driven low. Open-drain versions require an external pullup resistor. ...

Page 8

... The two-letter code in the Reset Voltage Threshold 1.388 Suffix Guide (Table 1) indicates the threshold level 1.313 combinations for V 1.110 1.050 The MAX6730A–MAX6735A feature an active-low reset 0.833 output (RST). RST asserts when the voltage at either 0.788 1.388 ...

Page 9

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output (MIN) RSTIN t RP RST WDO MR RST , WDO , and MR Timing Diagram Figure 1. Manual Reset Input Many µP-based ...

Page 10

... Floating WDI does not disable the watchdog timer. The MAX6730A–MAX6735A include a dual-mode watchdog timer to monitor µP activity. The flexible time- out architecture provides a long-period initial watchdog mode, allowing complicated systems to complete ...

Page 11

... Connect a 10kΩ resis- tor between RST and the µP’s reset I/O port to prevent logic contention (Figure 5). Falling V The MAX6730A–MAX6735A µP supervisors are relative- ly immune to short-duration falling V (glitches). Small glitches MAX6730A–MAX6735A, preventing undesirable reset pulses to the µ ...

Page 12

... START SET WDI HIGH PROGRAM CODE SUBROUTINE OR PROGRAM LOOP SET WDI LOW HANG IN SUBROUTINE SUBROUTINE COMPLETED RETURN Figure 6. Watchdog Flow Diagram 12 ______________________________________________________________________________________ Functional Diagram MAX6730A– MAX6735A REF RESET TIMEOUT PERIOD RSTIN REF REF ...

Page 13

... Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output PART MAX6730AUTLD3-T MAX6730AUTSD3-T MAX6730AUTRD3-T MAX6730AUTZD3-T MAX6730AUTVD3-T MAX6731AUTLD3-T MAX6731AUTTD3-T MAX6731AUTSD3-T MAX6731AUTRD3-T MAX6731AUTZD3-T MAX6731AUTVD3-T MAX6732AUTLTD3-T MAX6732AUTSYD3-T MAX6732AUTSVD3-T MAX6732AUTRVD3-T MAX6732AUTSHD3-T MAX6732AUTTGD3-T MAX6732AUTSDD3-T MAX6732AUTZWD3-T MAX6732AUTYHD3-T MAX6732AUTZGD3-T MAX6732AUTYDD3-T MAX6732AUTVHD3-T MAX6732AUTWGD3-T MAX6732AUTVDD3-T MAX6733AUTLTD3-T MAX6733AUTSYD3-T MAX6733AUTSVD3-T MAX6733AUTRVD3-T MAX6733AUTSHD3-T ...

Page 14

... MAX6730A GND 2 MAX6731A WDO 3 SOT23-6 Typical Operating Circuit +0.9V V CORE RSTIN RST MAX6734A WDI MAX6735A WDO PUSHBUTTON MR SWITCH GND VOLTAGE PART NUMBER MONITORS MAX6730A 1 MAX6731A 1 MAX6732A 2 MAX6733A 2 MAX6734A 3 MAX6735A 3 14 ______________________________________________________________________________________ RST MAX6732A 5 WDI GND 2 5 ...

Page 15

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) ______________________________________________________________________________________ Package Information PACKAGE OUTLINE, SOT 6L BODY 1 ...

Page 16

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