MAX6735AKAZID4+T Maxim Integrated, MAX6735AKAZID4+T Datasheet

MAX6735AKAZID4+T

Manufacturer Part Number

MAX6735AKAZID4+T

Description

Supervisory Circuits Single-/Dual-/Triple-Voltage N

Manufacturer

Maxim Integrated

Series

MAX6730A, MAX6731A, MAX6732A, MAX6733A, MAX6734A, MAX6735Ar

Datasheet

1.MAX6733AUTRYD4T.pdf (16 pages)

Specifications of MAX6735AKAZID4+T

Number Of Voltages Monitored

Monitored Voltage

0.9 V to 5 V

Undervoltage Threshold

4.5 V, 3 V

Manual Reset

Resettable

Watchdog

Supply Voltage - Max

5.5 V

Maximum Power Dissipation

714 mW

Supply Current (typ)

15 uA

Supply Voltage - Min

0.8 V

Current page: 1 of 16
Download datasheet (456Kb)

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 MAX6735AKAZID4+T

MAX6735AKAZID4+T Summary of contents

Page 1

... Printer/Fax Set-Top Boxes Typical Operating Circuit and Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. ♦ (Primary Supply) Reset Threshold Voltages CC from +1 ...

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

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 V 2 Reset ...

Page 4

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

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output ( +5V +3.3V +25°C, unless otherwise noted NORMALIZED TIMEOUT PERIOD vs. TEMPERATURE 1.020 1.016 1.012 1.008 1.004 1.000 0.996 0.992 0.988 0.984 ...

Page 7

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output PIN MAX6730A MAX6732A MAX6734A MAX6731A MAX6733A MAX6735A — — — — 7 _______________________________________________________________________________________ ...

Page 8

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output Table 1. Reset Voltage Threshold Suffix Guide NOMINAL CC PART NUMBER VOLTAGE SUFFIX THRESHOLD(V) LT 4.625 MS 4.375 MR 4.375 TZ 3.075 SY 2.925 RY 2.625 TW 3.075 SV 2.925 ...

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

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output The RSTIN comparator derives power from V the input voltage must remain less than or equal Low leakage current at RSTIN allows the use of CC large-valued resistors, resulting ...

Page 11

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output (MIN) RSTIN t RP RST WDO WDI MR Figure 4. Watchdog Input/Output Timing Diagram ( MR and WDO Connected) Applications Information Interfacing ...

Page 12

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output Threshold Overdrive graph, for which reset pulses are not generated. The graph was produced using falling V _ pulses, starting above V and ending below the CC TH reset threshold by the ...

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 MAX6733AUTTGD3-T ...

Page 14

Single-/Dual-/Triple-Voltage µP Supervisory Circuits with Independent Watchdog Output TOP VIEW RST 1 MAX6730A GND 2 MAX6731A WDO 3 SOT23-6 Typical Operating Circuit +0.9V V CORE RSTIN RST MAX6734A WDI MAX6735A WDO PUSHBUTTON MR SWITCH ...

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

... 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. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2006 Maxim Integrated Products Heaney Package Information (continued) SEE DETAIL " ...

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