MAX6453UT23S+T - Maxim Integrated

General Description

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

µP supervisors featuring separate VCC reset and manu-

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 thres-

holds. All devices are offered with nine factory-fixed

reset thresholds for monitoring primary system voltages

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

monitoring a secondary system voltage down to 0.63V.

Each device has a manual reset input, a VCC reset out-

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 transi-

tions high. The MAX6453/MAX6454 manual reset input

controls only the manual reset output and does not affect

the VCC reset output.

The manual reset input of the MAX6455/MAX6456 con-

trols both the manual reset and VCC reset outputs. When

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 timeout period

(140ms min) after the manual reset input transitions 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 period (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).

Applications

●Set-Top Boxes

●Consumer Electronics

●DVD Players

●Cable/DSL Modems

●MP3 Players

●Industrial Equipment

●Medical Devices

Features

●Precision Factory-Set Reset Thresholds From

1.6V to 4.6V

●Adjustable Threshold to Monitor Voltages Down

to 0.63V

●Manual Reset Input with Extended Setup Period

●Immune to Short Voltage Transients

●Low 6µA Supply Current

●Guaranteed Valid Reset Down to VCC = 1.0V

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

●Outputs

●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.

PART TEMP RANGE PIN-PACKAGE

MAX6453UT_ _ _-T -40°C to +85°C 6 SOT23

MAX6454UT_ _ _-T -40°C to +85°C 6 SOT23

MAX6455UT_ _ _-T -40°C to +85°C 6 SOT23

MAX6456UT_ _ _-T -40°C to +85°C 6 SOT23

GND

VCC

MROUT

1 6 MR

5 RSTIN

RESET

MAX6453

MAX6454

SOT23-6

TOP VIEW

3 4

GND

VCC

MROUT

1 6 MR

5 RSTIN

RESET

MAX6455

MAX6456

SOT23-6

3 4

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

19-2637; Rev 4; 5/14

Pin Congurations

Selector Guide appears at end of data sheet.

Ordering Information

(All voltages referenced to GND)

VCC ........................................................................-0.3V to +6V

Open-Drain RESET, MROUT ..................................-0.3V to +6V

MR, Push-Pull RESET, MROUT .............. -0.3V to (VCC + 0.3V)

MR, RSTIN .............................................................-0.3V to +6V

Input Current, All Pins ......................................................±20mA

Continuous Power Dissipation (TA = +70°C)

6-Pin SOT23 (derate 8.7mW/°C above +70°C) ..........696mW

Operating Temperature Range .......................... -40°C to +85°C

Junction Temperature ...................................................... +150°C

Storage Temperature Range ............................ -65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

Soldering Temperature (reflow)

Lead(Pb)-free...............................................................+260°C

Containing Lead ..........................................................+240°C

(VCC = 1.0V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

Operating Voltage Range VCC 1.0 5.5 V

VCC Supply Current ICC

VCC = 5.5V, no load 7 20 µA

VCC = 3.6V, no load 6 16

VCC Reset Threshold VTH

46 4.50 4.63 4.75

44 4.25 4.38 4.50

31 3.00 3.08 3.15

29 2.85 2.93 3.00

26 2.55 2.63 2.70

23 2.25 2.32 2.38

22 2.12 2.19 2.25

17 1.62 1.67 1.71

16 1.52 1.58 1.62

Reset Threshold Tempco 60 ppm/°C

Reset Threshold Hysteresis 2 × VTH mV

RSTIN Threshold VTH-RSTIN

TA = 0°C to +85°C 0.615 0.630 0.645 V

TA = -40°C to +85°C 0.610 0.650

RSTIN Threshold Hysteresis VHYST 2.5 mV

RSTIN Input Current IRSTIN -25 +25 nA

RSTIN to Reset Output Delay VRSTIN falling at 1mV/µs 15 µs

Reset Timeout Period tRP 140 210 280 ms

VCC to RESET Output Delay tRD VCC falling at 1mV/µs 20 µs

MR Minimum Setup Period

(Pulse Width) tMR MR to RESET

K 6.72 10.08 13.44

L 4.48 6.72 8.16

S 2.24 3.36 4.48

T 1.12 1.68 2.24

MR Minimum Input Pulse RESET asserted, MAX6455/MAX6456 2.24 3.36 4.48 s

MR Glitch Rejection 100 ns

MR to MROUT Delay 200 ns

Manual Reset Timeout Period tMRP 140 210 280 ms

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

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Electrical Characteristics

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these

or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

Absolute Maximum Ratings

Note 1: Devices production tested at TA = 25°C. Overtemperature limits are guaranteed by design.

(VCC = 1.0V to 5.5V, TA = -40°C to +85°C, unless otherwise specified. Typical values are at TA = +25°C.) (Note 1)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

MR to VCC Pullup Impedance 25 50 75 kW

RESET, MROUT Output Low

(Open Drain or Push-Pull) VOL

VCC ≥ 1.00V, ISINK = 50µA, outputs

asserted 0.3

VCC ≥ 1.20V, ISINK = 100µA, outputs

asserted 0.3

VCC ≥ 2.55V, ISINK = 1.2mA, outputs

asserted 0.3

VCC ≥ 4.25V, ISINK = 3.2mA, outputs

asserted 0.4

RESET, MROUT Output High

(Push-Pull) VOH

VCC ≥ 1.80V, ISOURCE = 200µA,

outputs deasserted 0.8 × VCC

VCC ≥ 3.15V, ISOURCE = 500µA,

outputs deasserted 0.8 × VCC

VCC ≥ 4.75V, ISOURCE = 800µA,

outputs deasserted 0.8 × VCC

RESET, MROUT Output

Open-Drain Leakage Current ILKG Outputs deasserted 1 µA

MR Input Low Voltage VIL 0.3 × VCC V

MR Input High Voltage VIH 0.7 × VCC V

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

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Electrical Characteristics (continued)

(VCC = 3.3V, TA = +25°C, unless otherwise noted.)

VCC TO RESET DELAY

MAX6453 toc08

TIME (100µs/div)

VCC (100mV/div)

RESET (2V/div)

VCC = 4.5V

VTH = 4.392V

VCC = 4.3V

MANUAL RESET TO MROUT AND

RESET DELAY (MAX6455/MAX6456)

MAX6453 toc07

TIME (1s/div)

MR (5V/div)

MROUT (5V/div)

RESET (5V/div)

VCC = 5V

RSTIN TO RESET DELAY

vs. TEMPERATURE (RSTIN FALLING)

MAX6453 toc06

TEMPERATURE (°C)

RSTIN TO RESET DELAY (µs)

603510-15

20.4

20.8

21.2

21.6

22.0

22.4

22.8

23.2

23.6

24.0

20.0

-40 85

RSTIN FALLING AT 1mV/µs

VCC TO RESET DELAY

vs. TEMPERATURE

MAX6453 toc05

TEMPERATURE (°C)

VCC TO RESET DELAY (µs)

603510-15

20.4

20.8

21.2

21.6

22.0

22.4

22.8

23.2

23.6

24.0

20.0

-40 85

VCC FALLING AT 1mV/µs

NORMALIZED VCC RESET THRESHOLD

vs. TEMPERATURE

MAX6453 toc04

TEMPERATURE (°C)

NORMALIZED VCC RESET THRESHOLD

603510-15

0.98

0.99

1.00

1.01

1.02

1.03

0.97

-40 85

MAXIMUM TRANSIENT DURATION

vs. RESET THRESHOLD OVERDRIVE

MAX6453 toc03

RESET THRESHOLD OVERDRIVE (mV)

TRANSIENT DURATION (µs)

800600400200

100

150

200

250

0 1000

RESET OCCURS

ABOVE THE CURVE

VTH = 4.4V

NORMALIZED RESET TIMEOUT PERIOD

vs. TEMPERATURE

MAX6453 toc02

TEMPERATURE (°C)

NORMALIZED TIMEOUT PERIOD

603510-15

0.96

0.97

0.98

0.99

1.00

1.01

1.02

1.03

1.04

1.05

0.95

-40 85

SUPPLY CURRENT

vs. SUPPLY VOLTAGE

MAX6453 toc01

SUPPLY VOLTAGE (V)

SUPPLY CURRENT (µA)

5.04.53.5 4.02.0 2.5 3.01.5

1.0 5.5

TA = +85°C

TA = -40°C

TA = +25°C

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

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Typical Operating Characteristics

NAME FUNCTION

MAX6453

MAX6454

MAX6455

MAX6456

1 —

RESET

Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when

VCC or RSTIN drops below its selected reset threshold. RESET remains low for the

140ms (min) reset timeout period after all monitored power-supply inputs exceed their

selected reset thresholds. MR does not affect RESET output. For open-drain outputs,

connect to an external pullup resistor.

— 1

Active-Low Push-Pull or Open-Drain Output. RESET changes from high to low when

VCC or RSTIN drops below its selected reset threshold. RESET remains low for the

140ms (min) reset timeout period after all monitored power-supply inputs exceed their

selected reset thresholds. RESET changes from high to low after MR input is held

low for the extended (typ) setup timeout period and deasserts 140ms (min) after MR

deasserts. For open-drain outputs, connect to an external pullup resistor.

2 2 GND Ground

3 3 MROUT Manual Reset Push-Pull or Open-Drain Output. MROUT asserts immediately after MR

is pulled low. MROUT remains low for 140ms (min) after MR is deasserted. For open-

drain outputs, connect to an external pullup resistor.

4 4 VCC VCC Voltage Input. Power supply and input for the primary microprocessor voltage reset

monitor.

5 5 RSTIN

Reset Input. High-impedance input to the adjustable reset comparator. Connect RSTIN

to the center point of an external resistor divider to set the threshold of the externally

monitored voltage.

6 —

Manual Reset Input. Internal 50kW pullup to VCC. Pull MR low to immediately assert

MROUT. MR does not affect RESET output.

— 6

Manual Reset Input. Internal 50kW pullup to VCC. Pull MR low to immediately assert

MROUT. RESET changes from high to low after MR input is held low for the extended

(typ) setup timeout period.

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

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Pin Description

Detailed Description

Reset Output

The reset output is typically connected to the reset input of

a microprocessor (µP). A µP’s reset input starts or restarts

the µP in a 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).

RESET changes from high to low whenever the moni-

tored voltage (RSTIN or VCC) drops below the reset

threshold voltages. When VRSTIN and VCC exceed their

respective reset threshold voltages, RESET remains low

for the reset timeout period, and then goes high. RESET

changes from high to low after MR input is held low for the

extended (typ) setup timeout period and deasserts 140ms

(min) after MR deasserts.

RESET is guaranteed to be in the proper output logic

state for VCC inputs ≥ 1V. For applications requiring valid

reset logic when VCC is less than 1V, see the Ensuring a

Valid RESET Output Down to VCC = 0V section.

Manual Reset

The MAX6453/MAX6454 contain a manual reset output

(MROUT) that asserts low immediately after driving MR

low and remains low for the reset timeout period after

MR goes high (Figure 1). The pushbutton manual reset

has no effect on the RESET output. MROUT output can

be used to drive an NMI (nonmaskable interrupt) on the

processor to save valuable data.

The MAX6455/MAX6456’s MROUT is asserted imme-

diately upon driving MR low. Driving MR low for longer

than the extended (typ) setup timeout period asserts

RESET. When MR is deasserted, MROUT and RESET

remain asserted low for the reset timeout period after

MR goes high (Figure 2).

Adjustable Input Voltage (RSTIN)

The MAX6453–MAX6456 monitor the voltage on RSTIN

using an adjustable reset threshold set with an external

resistor voltage divider (Figure 3). Use the following

formula to calculate the externally monitored voltage

(VMON-TH):

VMON-TH = VTH-RSTIN × (R1 +R2)/R2

where VMON_TH is the desired reset threshold voltage

and VTH-RSTIN is the reset input threshold (0.63V).

Resistors R1 and R2 can have very high values to mini-

mize current consumption due to low leakage currents.

Set R2 to some conveniently high value (250kW, for

example) and calculate R1 based on the desired reset

threshold voltage, using the following formula:

R1 = R2 5 (VMON_TH/VTH - 1)W

Figure 2. MAX6455/MAX6456 Timing Diagram

Figure 1. MAX6453/MAX6454 Timing Diagram

210ms

MROUT

RESET

LONG SETUP PERIOD

210ms

MROUT

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

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Applications Information

Interrupt Before Reset

To minimize data loss and speed system recovery/test,

many applications interrupt the processor or reset only

portions of the system before a processor hard reset

is asserted. The extended setup time of the MAX6455/

MAX6456 MR input allows the same pushbutton (Figure

4) to control both the interrupt and hard reset functions.

If the pushbutton is closed for less than the extended

setup timeout period, the processor is only interrupted

(MROUT). If the system still does not respond properly,

the pushbutton can be closed for the full extended

setup timeout period to hard reset the processor

(RESET). If desired, connect a LED to the RESET out-

put to turn off (or on) to signify when the pushbutton is

closed long enough for a hard reset (the same LED can

be used as the front panel power-on display).

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 5, the

open-drain output can be connected to voltages from 0

to 6V.

Generally, the pullup resistor connected to the RESET

connects to the supply voltage being monitored at the

IC’s VCC pin. However, some systems might use the

open-drain output to level-shift from the monitored supply

to reset circuitry powered by some other supply (Figure

5). Keep in mind that as the supervisor’s VCC decreases

toward 1V, so does the IC’s ability to sink current at

RESET (RESET is pulled high as VCC decays toward

0). The voltage where this occurs depends on the pullup

resistor value and the voltage to which it is connected.

Ensuring a Valid RESET Down to VCC = 0V

(Push-Pull RESET)

When VCC falls below 1V, RESET current-sinking capabil-

ities decline drastically. The high-impedance CMOS-logic

inputs connected to RESET can drift to undetermined

voltages. This presents no problem in most applications,

because most µPs and other circuitry do not operate with

VCC below 1V.

In applications where RESET must be valid down to 0V,

add a pulldown resistor between RESET and GND for

the push/pull outputs. The resistor sinks any stray leak-

age currents, holding RESET low (Figure 6). The value

of the pulldown resistor is not critical; 100kW is large

enough not to load RESET and small enough to pull

RESET to ground. The external pulldown cannot be

used with the open-drain reset outputs.

Transient Immunity

In addition to issuing a reset to the µP during power-up,

power-down and brownout conditions, these supervisors

are relatively immune to short duration falling transients

(glitches). The graph Maximum Transient Duration vs.

Reset Threshold Overdrive in the Typical Operating

Characteristics section shows this relationship.

The area below the curves of the graph is the region in

which these devices typically do not generate a reset

pulse. This graph was generated using a negative

going pulse applied to VCC, starting above the actual

reset threshold (VTH) and ending below it by the magni-

tude indicated (reset-threshold overdrive). As the mag-

nitude of the transient increases (VCC goes further

below the reset threshold), the maximum allowable

pulse width decreases. Typically, a VCC transient that

goes 100mV below the reset threshold and lasts 20µs

or less does not cause a reset pulse to be issued.

Figure 3. Calculating The Monitored Threshold Voltages

MAX6453

MAX6455

RSTIN VCC

RESET

GND

VMON_TH = 0.63 x (R1 + R2) / R2

VMON_TH VCC

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

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Figure 6. Ensuring RESET Valid to VCC = 0

Figure 5. Interfacing to Other Voltage LevelsFigure 4. Interrupt Before Reset Application Circuit

MAX6453–

MAX6456

RSTIN

VCC

RESET

TIMOUT PERIOD

(210ms typ)

MROUT

TIMOUT PERIOD

(210ms typ)

MR-TO-RESET

SETUP PERIOD

(3.36s typ)

MAX6455/MAX6456

0.63V

1.23V

GND

VCC

RESET

MROUT

MAX6453

MAX6455

RESET

VCC

GND

VCC

100kΩ

MAX6454

MAX6456 µP

RESET

GND

VCC VCC

5V 3.3V

100kΩ

MAX6455

µP

VCC

RSTIN

RESET

NMI

LED

I/O

SUPPLY

CORE SUPPLY

PUSHBUTTON SWITCH

CLOSE FOR IMMEDIATE SYSTEM INTERRUPT

CLOSE FOR >3.36s FOR SYSTEM RESET

+3.3V

+1.5V

RESET

MROUT

GND MR

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

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Functional Diagram

Table 3. Standard Versions Table

Table 2. Manual Reset Setup Period

Table 1. Reset Voltage Threshold

PART MR TO RESET DELAY MR ASSERTION MROUT AND RESET

PUSH-PULL OUTPUT

MROUT AND RESET

OPEN-DRAIN OUTPUT

MAX6453 — MROUT ✔—

MAX6454 — MROUT —✔

MAX6455 ✔MROUT and RESET ✔—

MAX6456 ✔MROUT and RESET —✔

PART TOP

MARK PART TOP

MARK

MAX6453UT16S ABOG MAX6455UT16S ABOL

MAX6453UT23S ABOH MAX6455UT23S ABOM

MAX6453UT26S ABOI MAX6455UT26S ABON

MAX6453UT29S ABOJ MAX6455UT29S ABOO

MAX6453UT46S ABOK MAX6455UT46S ABER

MAX6454UT16S ABOP MAX6456UT16S ABES

MAX6454UT23S ABEQ MAX6456UT23S ABOT

MAX6454UT26S ABOQ MAX6456UT26S ABOU

MAX6454UT29S ABOR MAX6456UT29S ABOV

MAX6454UT46S ABOS MAX6456UT46S ABOW

PART NO.

SUFFIX

( _ )

MANUAL RESET PERIOD

(s)

K 10.08

L 6.72

S 3.36

T 1.68

PART NO.

SUFFIX

( _ _ )

VCC NOMINAL

VOLTAGE

THRESHOLD (V)

46 4.625

44 4.375

31 3.075

29 2.925

26 2.625

23 2.313

22 2.188

17 1.665

16 1.575

MAX6453

µP

VCC

RSTIN

RESET

NMI

I/O

SUPPLY

CORE SUPPLY

+3.3V

+1.5V

RESET

MROUT

GND

MR GND

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

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Typical Operating Circuit

Selector Guide

PACKAGE

TYPE

PACKAGE

CODE

DOCUMENT

NO.

LAND

PATTERN NO.

6 SOT23 U6-1 21-0058 90-0175

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

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Package Information

For the latest package outline information and land patterns

(footprints), go to www.maximintegrated.com/packages. Note

that a “+”, “#”, or “-” in the package code indicates RoHS status

only. Package drawings may show a different suffix character, but

the drawing pertains to the package regardless of RoHS status.

Chip Information

PROCESS: BiCMOS

REVISION

NUMBER

REVISION

DATE DESCRIPTION PAGES

CHANGED

0 10/02 Initial release —

3 6/10

Revised the General Description, Features, Applications, Ordering Information,

Absolute Maximum Ratings, Electrical Characteristics, Pin Description, the Reset

Output, Manual Reset, and Interrupt Before Reset sections, and Tables 2 and 3 to

add extended setup time specifications.

1, 2, 5, 6, 7, 9

4 5/14 No /V OPNs; removed automotive reference from Applications section 1

Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses

are implied. Maxim Integrated reserves the right to change the circuitry and specications without notice at any time. The parametric values (min and max limits)

shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.

MAX6453–MAX6456 µP Supervisors with Separate VCC Reset and

Manual Reset Outputs

│

Revision History

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MAX6453UT16S+T MAX6453UT17S+T MAX6453UT22S+T MAX6453UT23S+T MAX6453UT26S+T

MAX6453UT29S+T MAX6453UT31S+T MAX6453UT44S+T MAX6453UT46S+T MAX6454UT16S+T

MAX6454UT17S+T MAX6454UT22S+T MAX6454UT23S+T MAX6454UT26S+T MAX6454UT29S+T

MAX6454UT31S+T MAX6454UT44S+T MAX6454UT46S+T MAX6455UT16S+T MAX6455UT17S+T

MAX6455UT22S+T MAX6455UT23S+T MAX6455UT26S+T MAX6455UT29S+T MAX6455UT31S+T

MAX6455UT44S+T MAX6455UT46S+T MAX6456UT16S+T MAX6456UT17S+T MAX6456UT22S+T

MAX6456UT23S+T MAX6456UT26S+T MAX6456UT29L+T MAX6456UT29S+T MAX6456UT31S+T

MAX6456UT44S+T MAX6456UT46S+T