MAX6454UT44S-T Maxim Integrated, MAX6454UT44S-T Datasheet

MAX6454UT44S-T

Manufacturer Part Number

MAX6454UT44S-T

Description

Supervisory Circuits

Manufacturer

Maxim Integrated

Series

MAX6453, MAX6454, MAX6455, MAX6456r

Datasheet

1.MAX6454UT16S-T.pdf (11 pages)

Specifications of MAX6454UT44S-T

Number Of Voltages Monitored

Monitored Voltage

1.8 V to 5 V

Undervoltage Threshold

Adjustable

Overvoltage Threshold

Adjustable

Output Type

Active Low, Open Drain

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

696 mW

Minimum Operating Temperature

- 40 C

Power Fail Detection

Supply Current (typ)

7 uA

Supply Voltage - Min

1 V

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The MAX6453–MAX6456 are low-power, dual-voltage

µP supervisors featuring separate V

al reset outputs. The dual outputs support both soft-

system reset (interrupt) and hard-system reset (reboot)

functions. The reset output asserts when any of the

monitored voltages falls below its specified threshold

and remains asserted for the reset timeout (140ms min)

after all voltages exceed their respective reset thresh-

olds. All devices are offered with nine factory-fixed

reset thresholds for monitoring primary system voltages

monitoring a secondary system voltage down to 0.63V.

Each device has a manual reset input, a V

put, and a manual reset output. The MAX6453/

MAX6454 manual reset output asserts when the manual

reset input is low. It remains asserted for the manual

reset timeout period (140ms min) after the manual reset

input transitions high. The MAX6453/MAX6354 manual

reset input controls only the manual reset output and

does not affect the V

The manual reset input of the MAX6455/MAX6456 con-

trols both the manual reset and V

the manual reset input is low for less than the extended

setup timeout period, only the manual reset output

asserts and remains asserted for the manual reset time-

out period (140ms min) after the manual reset input tran-

sitions high. If the manual reset input is low for at least

the extended setup timeout period, the reset output also

asserts and remains asserted for the reset timeout peri-

od (140ms min) after the manual reset input transitions

high. This enhanced feature allows the implementation of

a soft/hard-system reset combination.

The MAX6453/MAX6455 have active-low, push-pull

reset and manual reset outputs, and the MAX6454/

MAX6456 have active-low, open-drain reset and manu-

al reset outputs. All devices are available in small

SOT23-6 packages and are fully specified over the

extended temperature range (-40°C to +85°C).

19-2637; 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.

) from 1.8V to 5V and an adjustable reset input for

µP Supervisors with Separate V

Set-Top Boxes

Consumer Electronics

DVD Players

Cable/DSL Modems

MP3 Players

Industrial Equipment

Automotive

Medical Devices

________________________________________________________________ Maxim Integrated Products

General Description

reset output.

Applications

reset outputs. When

reset and manu-

reset out-

♦ Precision Factory-Set Reset Thresholds From

♦ Adjustable Threshold to Monitor Voltages Down

♦ Manual Reset Input with Extended Setup Period

♦ Immune to Short Voltage Transients

♦ Low 6µA Supply Current

♦ Guaranteed Valid Reset Down to V

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

♦ 140ms (min) Reset Timeout Period

♦ Small SOT Package

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

level of the devices. A desired threshold level is set by the part

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 ver-

sions require a minimum order increment of 10,000 pieces.

Contact factory for availability.

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

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

Selector Guide appears at end of data sheet.

MAX6453UT_ _ _-T

MAX6454UT_ _ _-T

MAX6455UT_ _ _-T

MAX6456UT_ _ _-T

Manual Reset Outputs

1.6V to 4.6V

to 0.63V

Outputs

TOP VIEW

MROUT

RESET

GND

PART

SOT23-6

MAX6453

MAX6454

Ordering Information

6 MR

5 RSTIN

-40°C to +85°C

TEMP RANGE

Pin Configurations

MROUT

RESET

GND

Reset and

SOT23-6

MAX6455

MAX6456

PIN-PACKAGE

6 SOT23

Features

= 1.0V

RSTIN

Related parts for MAX6454UT44S-T

MAX6454UT44S-T Summary of contents

Page 1

... 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. Manual Reset Outputs ♦ Precision Factory-Set Reset Thresholds From reset and manu- 1 ...

Page 2

Supervisors with Separate V Manual Reset Outputs ABSOLUTE MAXIMUM RATINGS (All voltages referenced to GND) V ..........................................................................-0.3V to +6V CC Open-Drain RESET, MROUT ....................................-0.3V to +6V MR, Push-Pull RESET, MROUT ..................-0. MR, RSTIN ...............................................................-0.3V to +6V Input ...

Page 3

Supervisors with Separate V ELECTRICAL CHARACTERISTICS (continued 1.0V to 5.5V -40°C to +85°C, unless otherwise specified. Typical values are PARAMETER SYMBOL Pullup Impedance CC RESET, MROUT Output Low ...

Page 4

Supervisors with Separate V Manual Reset Outputs (V = 3.3V +25°C, unless otherwise noted SUPPLY CURRENT vs. SUPPLY VOLTAGE +85° +25° -40°C ...

Page 5

Supervisors with Separate V PIN NAME MAX6453 MAX6455 MAX6454 MAX6456 1 — RESET — GND MROUT RSTIN 6 — MR — 6 _______________________________________________________________________________________ Manual Reset Outputs FUNCTION Active-Low ...

Page 6

... 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 MAX6453– MAX6456 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 7

Supervisors with Separate V V MON_TH R1 MAX6453 MAX6455 RSTIN V R2 GND RESET V = 0.63 x ( MON_TH Figure 3. Calculating The Monitored Threshold Voltages Applications Information Interrupt Before Reset To minimize data ...

Page 8

Supervisors with Separate V Manual Reset Outputs +3.3V +1.5V V RESET CC MAX6455 RSTIN LED MROUT GND MR PUSHBUTTON SWITCH CLOSE FOR IMMEDIATE SYSTEM INTERRUPT CLOSE FOR >3.36s FOR SYSTEM RESET Figure 4. Interrupt Before Reset Application Circuit V ...

Page 9

Supervisors with Separate V Table 1. Reset Voltage Threshold PART NO. SUFFIX ( Table 2. Manual Reset Setup Period PART NO. MANUAL RESET PERIOD SUFFIX ( _ ...

Page 10

Supervisors with Separate V Manual Reset Outputs Chip Information PROCESS: BiCMOS 10 ______________________________________________________________________________________ Reset and CC Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the ...

Page 11

... 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. 11 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products ...

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